Transcript
Jeio Tech Co., Inc. Service Manual Rev #: TH-ME-00
Date: 04 Apr 11
Page: 1 of 65
Temperature Humidity-ME
TH-ME
1
Rev #: TH-ME-00
Date: 04 Apr 11
Table of Contents 1.0 Temperature 1.1.0 Temperature does not Increase-----------------------------------------------------------------------04 1.2.0 Temperature does not Decrease----------------------------------------------------------------------09 1.3.0 Temperature Fluctuation------------------------------------------------------------------------------12 1.4.0 Temperature Keeps Decreasing----------------------------------------------------------------------14 1.5.0 Temperature Keeps Increasing-----------------------------------------------------------------------15
2.0 Humidity 2.1.0 Humidity does not Increase---------------------------------------------------------------------------16 2.2.0 Humidity does not Decrease--------------------------------------------------------------------------22 2.3.0 Humidity Fluctuation----------------------------------------------------------------------------------25 2.4.0 Humidity Keeps Decreasing--------------------------------------------------------------------------27 2.5.0 “----” Display-------------------------------------------------------------------------------------------28
3.0 Power 3.1.0 No power------------------------------------------------------------------------------------------------29 3.2.0 Power Shuts OFF After the Unit is Turned ON---------------------------------------------------31
4.0 ERR 4.1.0 Over Temperature ERR-------------------------------------------------------------------------------33 4.2.0 Water Level ERR--------------------------------------------------------------------------------------36 4.3.0 Door ERR-----------------------------------------------------------------------------------------------38
5.0 Display 5.1.0 Display Error-------------------------------------------------------------------------------------------39
6.0 Noise 6.1.0 Noise While the Unit is Running--------------------------------------------------------------------40
7.0 Water Leakage 7.1.0 Drain Valve Leakage----------------------------------------------------------------------------------42 7.2.0 Leaking from Base of Unit---------------------------------------------------------------------------43
8.0 Current Leakage 8.1.0 Activated Circuit Breaker Switch--------------------------------------------------------------------44
9.0 RS 9.1.0 No Connection-----------------------------------------------------------------------------------------47
10.0 Miscellaneous 10.1.0 Internal Frost------------------------------------------------------------------------------------------49 10.2.0 Corrosion----------------------------------------------------------------------------------------------49
12.0 Disassembly Guide 12.1.1 Control Panel Disassembly-------------------------------------------------------------------------51 12.1.2 Rear Panel Disassembly-----------------------------------------------------------------------------51 12.1.3 Door Sensor Disassembly---------------------------------------------------------------------------51 Page 2 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
12.1.4 SSR (solid state relay) Disassembly---------------------------------------------------------------52 12.1.5 Water Level Tank Disassembly/Diagnostic Test------------------------------------------------52 12.1.6 Chamber Motor/Fan Disassembly-----------------------------------------------------------------53 12.1.7 Chamber Back Panel Disassembly-----------------------------------------------------------------53 12.1.8 Dry Heater Disassembly-----------------------------------------------------------------------------54 12.1.9 Humidity Heater Disassembly----------------------------------------------------------------------54 12.1.10 Chamber Motor/Fan Disassembly----------------------------------------------------------------54 12.1.11 Temperature Sensor & Humidity Sensor Disassembly----------------------------------------55 12.1.12 Air & Water Over Temperature Disassembly---------------------------------------------------55 12.1.13 Water Tank Disassembly--------------------------------------------------------------------------56 12.1.14 Fuse Disassembly-----------------------------------------------------------------------------------57 12.1.15 Water Supply Solenoid Valve Disassembly-----------------------------------------------------57 12.1.16 Compressor Disassembly-------------------------------------------------------------------------58
12.2.0 Diagnostic Test 12.2.1 Input AC Voltage Diagnostic Test-----------------------------------------------------------------59 12.2.2 Output AC Voltage Diagnostic Test---------------------------------------------------------------59 12.2.3 Blown Fuse Diagnostic Test------------------------------------------------------------------------59 12.2.4 Heater Diagnostic Test------------------------------------------------------------------------------60 12.2.5 Current Leakage Diagnostic Test for Humidity Heater-----------------------------------------60 12.2.6 Current Leakage Diagnostic Test for Chamber Motor------------------------------------------60 12.2.7 Current Leakage Diagnostic Test for Compressor-----------------------------------------------61 12.2.8 Current Leakage Diagnostic Test for SSR (solid state relay)----------------------------------61 12.2.9 Continuity Diagnostic Test--------------------------------------------------------------------------62 12.2.10 12.2.11 Water Level Adjustment---------------------------------------------------------------------------62
12.3.0 Miscellaneous 12.3.1 12.3.2 12.3.3 12.3.4
Recharging & Releasing Refrigerant Gas--------------------------------------------------------63 Water Flow/Tubing Diagram-----------------------------------------------------------------------63 PID (proportional-integral-derivative) Controller-----------------------------------------------64 Water Supply Solenoid Valve Assembly---------------------------------------------------------65
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Rev #: TH-ME-00
Date: 04 Apr 11
1.0 Temperature Temperature does not Increase 1.1.1 Defective Heater Classification Temperature
Check Point
Symptom Temperature does not increase
Problem Defective heater
1. Turn the temperature/humidity unit ON 2. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 3. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature. 4. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, connect the heater input line and measure the amperage. 5. Use a multi meter, set the multi meter to resistance mode, and measure the resistance by placing the red test probe pin on the wire terminal end of the heater and the black test probe pin on the side of the heater bracket. If resistance is not displayed on the multi meter, the heater is defective. Replace the defective heater.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.7 Chamber Back Panel Disassembly 3. refer to section 12.1.8 Dry Heater Disassembly 4. After replacing the defective heater, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.2 Defective SSR (solid state relay) Classification Temperature
Check Point
Symptom Temperature does not increase
Problem Defective SSR (solid state relay)
1. Turn the temperature/humidity unit ON 2. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 3. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature.
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Date: 04 Apr 11
4. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage output by placing the black and red test probe pins on the input of the SSR (solid state relay), as depicted in the picture above. If the AC voltage is displayed on the multi meter display, the SSR (solid state relay) is defective. Replace the defective SSR (solid state relay).
Solution
1. refer to section 12.1.1 Control Panel Disassembly. 2. refer to section 12.1.4 SSR (solid state relay) Disassembly/Diagnostic Test. 3. After replacing the defective SSR (solid state relay), follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.3 Defective Chamber Motor Classification Temperature
Check Point
Symptom Temperature does not increase
Problem Defective Chamber Motor
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the AC voltage is displayed on the multi meter and the motor does not run, the motor is defective. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly Page 5 of 65
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3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.4 Short or Loose Wire Terminal Classification Temperature
Symptom Temperature does not increase
Problem Short or Loose Wire Terminal
1. Check the wire from the SSR (solid state relay) heater 2. Use a multi meter, set to ohms, and perform a diagnostic/short test. If the resistance does not display on the multi meter one of the wires are disconnected Check Point
3. Check the ends of the wire terminals and make sure the ends of the wire terminals are properly secured on the tip of the wires. If the wire terminal is loose, take the wire crimp and recrimp the terminals, or replace the wire terminals from the wire with the loose wire terminal. Recrimp the loose wire terminals or replace the wire terminals from the wire with the loose wire terminal.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. Replace the wire with a short 3. Replace the old wire terminals with the new wire terminals. 4. After replacing the wire terminals or recrimping the loose wire terminals, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.5 Defective Over Temperature Limit Sensor Classification Temperature
Check Point
Solution
Symptom Temperature does not increase
Problem Defective Over Temperature Limit Sensor
1. Check the over temperature limit sensor setting (150-155 degrees Celsius). Set the over temperature setting to 150-155 degrees Celsius. 1. refer to section 12.1.12 Over Temperature Disassembly 2. After setting the over temperature limit sensor or replacing the defective over temperature limit sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
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Rev #: TH-ME-00
Date: 04 Apr 11
1.1.6 Defective Water Level Sensor Classification Temperature
Check Point
Solution
Symptom Temperature does not increase
Problem Defective Water Level Sensor
1. Check the water level and check for stains inside the water tank, 2. If the water level is clean, use a multi meter, set the multi meter to resistance mode, and test the resistance of the water level by placing the red test probe pin on the positive wire terminal of the water level and the black test probe pin on the water tank. Clean the water level or replace the defective water level. 1. refer to section 12.1.13 Water Tank Disassembly 2. Clean the water level or replace the water level. 3. After cleaning the water level or replacing the defective water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.7 Low Refrigerant Level Classification Temperature
Check Point
Solution
Symptom Temperature does not increase
Problem Low Refrigerant Level
1. Set the SP (setpoint) temperature to 25 degrees Celsius. 2. Check the refrigerant gas pressure (5-7psi) 3. If the refrigerant gas level is under 5-7psi the refrigerant level is low. Add more refrigerant gas to the compressor. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.3.1 Recharging Refrigerant Gas 3. After filling up the compressor with refrigerant, check the pressure of the in compressor (10-12psi). 4. After filling up the compressor with refrigerant and checking the pressure of the compressor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.8 Refrigeration System Malfunction Classification Temperature
Symptom Temperature does not increase
Problem Refrigeration System Malfunction
1. Turn the unit ON and press RUN. 2. Check for noise coming from the refrigeration unit. Check Point If the refrigeration system is noisy the refrigeration system is malfunctioning. Page 7 of 65
Rev #: TH-ME-00
Solution
Date: 04 Apr 11
3. Use a multi meter, check the voltage of the refrigeration system and for current leakage. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.2.7 Current Leakage Test 3. refer to section 12.1.16 Refrigeration System Disassembly 4. After the refrigeration system malfunction is corrected, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.1.9 Refrigeration System Overload Classification Temperature
Symptom Temperature does not increase
Problem Refrigeration System Overload
1. Check the compressor head of the refrigeration system Check Point
Solution
If the refrigeration system is over 95 degrees Celsius the refrigeration system is overloaded. 1. refer to section 12.1.2 Rear Panel Disassembly 2. Wait for the compressor to cool down or used compressed air to cool down the compressor. 3. Turn the unit back ON and assess the problem. 4. After the refrigeration system overload problem is corrected, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
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Rev #: TH-ME-00
Date: 04 Apr 11
Temperature does not Decrease 1.2.1 Refrigeration Copper Piping or Dryer Blocked Classification Temperature
Check Point
Solution
Symptom Temperature does not Decrease
Problem Refrigeration Copper Piping or Dryer Blocked
1. Turn the Unit ON and press run 2. Low refrigerant pressure which creates vacuum pressure indicates that the refrigeration copper piping or the dryer is blocked. Replace the dryer. 1. refer to section 12.1.2 Rear Panel Disassembly 2. Replace the dryer. 3. After replacing the dryer, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.2.2 Defective Condenser Motor Classification Temperature
Check Point
Symptom Temperature does not Decrease
Problem Defective Condenser Motor
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the pressure in compressor is normal the condenser fan is defective. Replace the defective condenser motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.6 Condenser Motor Disassembly 3. After replacing the defective condenser fan, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.2.3 Condenser Blocked with Particulate Matter Classification Temperature
Symptom Temperature does not Decrease
Problem Condenser Blocked with Particulate Mater
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Rev #: TH-ME-00
Check Point
Solution
Date: 04 Apr 11
1. Check for dust in the condenser. 1. refer to section 12.1.2 Rear Panel Disassembly 2. Remove and clean the dust out of the condenser. 3. After removing and cleaning the dust out of the condenser, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.2.4 Defective Chamber Fan Motor Classification Temperature
Check Point
Symptom Temperature does not Decrease
Problem Defective Chamber Fan Motor
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the AC voltage is displayed on the multi meter and the motor does not run, the motor is defective.. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.2.5 Inner Chamber Heat Issue Classification Temperature
Symptom Temperature does not Decrease
Problem Inner Chamber Heat Issue
1. Check the inner chamber for a heating source Check Point Solution
If the heater heating value is greater than the refrigeration cooling value the temperature will not increase. 1. refer to the technical data documents
1.2.6 IS2 Temperature Out of Range Classification
Symptom
Problem Page 10 of 65
Rev #: TH-ME-00
Temperature
Check Point
Solution
Date: 04 Apr 11
Temperature does not Decrease
IS2 Temperature Out of Range
1. Turn the unit ON 2. Check the unit selected for the PV (process value) temperature 3. Check the SV (set point value) temperature for controller IS2 4. If PV (process value) temperature is out of range from the SV (set point value) IS2, the refrigeration system will not turn ON. (IS2:-25 degrees Celsius ~ 98 degrees Celsius temperature set point) Refrigeration system does not turn ON, the PV (process value) temperature is out of range from the SV (set point value) IS2. 1. Check the SV (set point value) temperature IS2
1.2.7 Short or Loose Wire Terminals Classification Temperature
Check Point
Solution
Symptom Temperature does not Decrease
Problem Short or Loose Wire Terminals
1. Turn the unit ON and press the START button 2. Check to see if the refrigeration system 3. Check the wire and terminal connections between the refrigeration main controller and refrigeration unit. Recrimp the loose wire terminals or replace the wire terminals from the wire with the loose wire terminal. 1. refer to section 12.1.1 Control Panel Disassembly 2. Replace the wire with a short 3. Replace the old wire terminals with the new wire terminals. 4. After replacing the wire terminals or recrimping the loose wire terminals, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state
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Rev #: TH-ME-00
Date: 04 Apr 11
Temperature Fluctuation 1.3.1 Defective Chamber Fan Motor Classification Temperature
Check Point
Symptom Temperature Fluctuation
Problem Defective Chamber Fan Motor
1. Turn the unit ON and press the START button. 2. Check to see if the chamber fan motor is working. 3. If the chamber fan motor does not work, check the voltage of the chamber fan motor. If the unit is running, the chamber fan motor does not work, and when using the multi meter to check the voltage, there is a voltage reading then the chamber fan motor is defective. Replace the defective chamber fan motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Fan Motor Disassembly 3. Replace the defective chamber fan motor. 4. After replacing the defective chamber fan motor, follow the directions in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.3.2 Improperly Connected Temperature Sensor Classification Temperature
Check Point Solution
Symptom Temperature Fluctuation
Problem Improperly Connected Temperature Sensor
1. Check the wire and wiring connection between the temperature sensor and the main PCB (printed circuit board). 1. refer to section 12.1.1 Control Panel Disassembly 2. Properly connect the temperature to the main PCB (printed circuit board).
1.3.3 Refrigeration System Malfunction Classification Temperature
Check Point
Symptom Temperature Fluctuation
Problem Refrigeration System Malfunction
1. Turn the unit ON 2. Set the SV (set point value) temperature to 25 degrees Celsius 3. Check the pressure in the condenser tank. 4. If the pressure in the condenser tank reads low pressure, the refrigeration system is malfunctioning Page 12 of 65
Rev #: TH-ME-00
Solution
Date: 04 Apr 11
1. Check the parts in the refrigeration system 2. Check the refrigerant level at ambient temperature 3. Check the condenser for dust.
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Rev #: TH-ME-00
Date: 04 Apr 11
Temperature Keeps Decreasing 1.4.1 Defective Chamber Motor Classification Temperature
Check Point
Symptom Temperature Keeps Decreasing
Problem Defective Chamber Motor
1. Turn the unit ON 2. Check if the chamber motor is running. 3. If the chamber motor does not run, use a multi-meter, and check the voltage output. If there is a voltage output reading, the chamber motor is defective. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Fan Motor Disassembly 3. After replacing the defective chamber fan motor, follow the directions in reverse order and assemble the disassembled temperature/humidity unit to its original state.
1.4.2 Improperly Connected Temperature Sensor Classification Temperature
Check Point Solution
Symptom Temperature Keeps Decreasing
Problem Improperly Connected Temperature Sensor
1. Check the wire and wiring connection between the temperature sensor and the main PCB (printed circuit board). 1. refer to section 12.1.1 Control Panel Disassembly 2. Properly connect the temperature to the main PCB (printed circuit board).
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Rev #: TH-ME-00
Date: 04 Apr 11
Temperature Keeps Increasing 1.5.1 Defective SSR (solid state relay) Classification Temperature
Symptom Temperature Keeps Increasing
Problem Defective SSR (solid state relay)
1. Turn the temperature/humidity unit ON 2. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 3. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature.
Check Point
4. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage output by placing the black and red test probe pins on the input of the SSR (solid state relay), as depicted in the picture above.
Solution
If the AC voltage is displayed on the multi meter display, the SSR (solid state relay) is defective. Replace the defective SSR (solid state relay). 1. refer to section 12.1.1 Control Panel Disassembly. 2. refer to section 12.1.4 SSR (solid state relay) Disassembly/Diagnostic Test. 3. After replacing the defective SSR (solid state relay), follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
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Rev #: TH-ME-00
Date: 04 Apr 11
2.0 Humidity Humidity does not Increase 2.1.1 Defective Humidity Heater Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Defective Humidity Heater
1. Turn the temperature/humidity unit ON 2. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 3. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature. 4. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, connect the heater input line and measure the amperage. 5. Use a multi meter, set the multi meter to resistance mode, and measure the resistance by placing the red test probe pin on the wire terminal end of the heater and the black test probe pin on the side of the heater bracket. If resistance is not displayed on the multi meter, the heater is defective. Replace the defective heater.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.7 Chamber Back Panel Disassembly 3. refer to section 12.1.8 Humidity Heater Disassembly 4. After replacing the defective humidity heater, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.2 Defect Chamber Fan Motor Classification Humidity
Check Point
Solution
Symptom Humidity does not Increase
Problem Defective Chamber Motor
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the AC voltage is displayed on the multi meter and the motor does not run, the motor is defective. Replace the defective motor. Page 16 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.3 Wrong Parameter Setting Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Wrong Parameter Setting
1. Check the parameter set values. 2. Check the humidity sensor and verify that in the INPUT menu the display screen displays DCV (1~5V). If in the INPUT menu the display screen does not display DCV (1~5V), change the INPUT value to DCV (1~5V). Change the INPUT value to DCV (1~5V).
Solution
1. Press the MENU button 2. At the Main Menu Press the DOWN ARROW button (4) times 3. Press the SET button 4. Input password and press the SET button 5. At the Setup Menu Press the SET button 6. Press the PAGE UP button (3) times 7. At the Humi Input, press the SET button and use the LEFT, UP and DOWN ARROWS to change to DCV RNG. HIGH (5.000) and RNG. LOW (1.000) values.
2.1.4 Defective SSR (solid state relay) Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Defective SSR (solid state relay)
1. Turn the temperature/humidity unit ON 2. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 3. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature.
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4. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage output by placing the black and red test probe pins on the input of the SSR (solid state relay), as depicted in the picture above. If the AC voltage is displayed on the multi meter display, the SSR (solid state relay) is defective. Replace the defective SSR (solid state relay).
Solution
1. refer to section 12.1.1 Control Panel Disassembly. 2. refer to section 12.1.4 SSR (solid state relay) Disassembly/Diagnostic Test. 3. After replacing the defective SSR (solid state relay), follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.5 Defective Humidity Sensor Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.6 Defective Feed Pump Classification
Symptom
Problem Page 18 of 65
Rev #: TH-ME-00
Humidity
Check Point
Date: 04 Apr 11
Humidity does not Increase
Defective Feed Pump
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value and press and hold the RUN/STOP button until the unit starts running. 3. Check to see if the feed pump is working. 4. Use a multi meter, measure the input DC voltage (12V) of the feed pump. If the there is voltage coming from the feed pump and the feed pump is not working, the feed pump is defective. Replace the defective feed pump.
Solution
1. refer to section 12.1.13 Water Tank Disassembly 2. refer to section 12.3.2 Water Flow/Tubing Diagram 3. After replacing the feed pump, go over again the check point steps. 4. After replacing the defective feed pump, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.7 Defective Water Supply SOL Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Defective Water Supply Solenoid Valve
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. While the feed pump is running, check to see if the water supply solenoid valve is working. 4. Use a multi meter, measure the input AC voltage (220-230V) of the water supply solenoid valve. If the there is voltage coming from the water supply solenoid valve and the water supply solenoid valve is not working, the water supply solenoid valve is defective. Replace the defective water supply Solenoid valve.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.15 Water Supply Solenoid valve disassembly 3. After replacing the defective water supply solenoid valve, go over again the check point steps. 4. After replacing the defective waters supply solenoid valve, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state. Page 19 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
2.1.8 Defective Water Level Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Defective Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Move the water level up and down to check to see if the water supply solenoid valve and water pump is working. If the supply water solenoid valve and the water pump are not working, the water level is defective. Replace the defective water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.5 Water Level/Tank Disassembly 3. After replacing the defective water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.9 Misadjusted Water Level Classification Humidity
Check Point
Symptom Humidity does not Increase
Problem Misadjusted Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Check the water capacity in the inner bath. If the water level is below 5mm, the humidity, the water level needs to be adjusted. Adjust the water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.3.2 Water Flow/Tubing Diagram 3. refer to section 12.2.11 Inner Water Level Adjustment 4. After adjusting the water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.1.10 Blocked Water Supply Hose Page 20 of 65
Rev #: TH-ME-00
Classification Humidity
Check Point
Date: 04 Apr 11
Symptom Humidity does not Increase
Problem Blocked Water Supply Hose
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Check to see if all the parts connected within the water line are working. If all the parts are working the water supply hose is blocked. Unclog and clean the blocked water supply hose.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.3.2 Water Flow/Tubing Diagram 3. After unclogging and cleaning the blocked water supply hose, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 21 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Humidity does not Decrease 2.2.1 Low Refrigerant Level Classification Humidity
Check Point
Solution
Symptom Humidity does not Decrease
Problem Low Refrigerant Level
1. Set the SP (setpoint) temperature to 25 degrees Celsius. 2. Check the refrigerant gas pressure (5-7psi) 3. If the refrigerant gas level is under 5-7psi the refrigerant level is low.. Add more refrigerant gas to the compressor. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.3.1 Recharging Refrigerant Gas 3. After filling up the compressor with refrigerant, check the pressure of the in compressor (10-12psi). 4. After filling up the compressor with refrigerant and checking the pressure of the compressor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.2 Refrigeration System Malfunction Classification Humidity
Symptom Humidity does not Decrease
Problem Refrigeration System Malfunction
1. Turn the unit ON and press RUN. 2. Check for noise coming from the refrigeration unit. Check Point
Solution
If the refrigeration system is noisy the refrigeration system is malfunctioning. 3. Use a multi meter, check the voltage of the refrigeration system and for current leakage.. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.2.7 Current Leakage Test 3. refer to section 12.1.16 Refrigeration System Disassembly 4. After the refrigeration system malfunction is corrected, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.3 Refrigeration System Overload Classification Humidity Check Point
Symptom Humidity does not Decrease
Problem Refrigeration System Overload
1. Check the compressor head of the refrigeration system Page 22 of 65
Rev #: TH-ME-00
Solution
Date: 04 Apr 11
If the refrigeration system is over 95 degrees Celsius the refrigeration system is overloaded. . 1. refer to section 12.1.2 Rear Panel Disassembly 2. Wait for the compressor to cool down or used compressed air to cool down the compressor. 3. Turn the unit back ON and assess the problem. 4. After the refrigeration system overload problem is corrected, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.4 Refrigeration Copper Piping or dryer blocked Classification Humidity
Check Point
Solution
Symptom Humidity does not Decrease
Problem Refrigeration Copper Piping or Dryer Blocked
1. Turn the Unit ON and press run 2. Low refrigerant pressure which creates vacuum pressure indicates that the refrigeration copper piping or the dryer is blocked.. Replace the dryer. 1. refer to section 12.1.2 Rear Panel Disassembly 2. Replace the dryer. 3. After replacing the dryer, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.5 Defective Motor Classification Humidity
Check Point
Symptom Humidity does not Decrease
Problem Defective Chamber Fan
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the AC voltage is displayed on the multi meter and the motor does not run, the motor is defective. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly Page 23 of 65
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3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.6 Defective Humidity Sensor Classification Humidity
Check Point
Symptom Humidity does not Decrease
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective. Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.2.7 Refrigerant Pressure Switch Trip Classification Humidity
Check Point
Solution
Symptom Humidity does not Decrease
Problem Refrigerant Pressure Switch Trip
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. If the refrigeration system does not work, push the reset button on the refrigeration pressure switch. 4. If the refrigeration parts work, check what is causing the tripping of the refrigeration pressure switch.
1. refer to section 12.1.2 Rear Panel Disassembly 2. Check the refrigerant level. 3. Check for dust in the condenser. 3. After finding what the cause of the refrigerant pressure switch trip, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 24 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Humidity Fluctuation 2.3.1 Defective Chamber Fan Motor Classification Humidity
Check Point
Symptom Humidity Fluctuation
Problem Defective Chamber Fan Motor
1. Turn the temperature/humidity unit ON 2. START the temperature/humidity unit 3. Check the motor 4. If the motor is not running, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage from motor by placing the red test probe pin on one connected terminal of the motor wire terminal and the black test probe pin on the other connected terminal of the motor wire terminal. If the AC voltage is displayed on the multi meter and the motor does not run, the motor is defective. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.3.2 Defective Humidity Sensor Classification Humidity
Check Point
Symptom Humidity Fluctuation
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective. Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.3.3 Refrigeration System Malfunction Classification Humidity
Symptom Humidity Fluctuation
Problem Refrigeration System Page 25 of 65
Rev #: TH-ME-00
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Malfunction 1. Turn the unit ON and press RUN. 2. Check for noise coming from the refrigeration unit. Check Point
Solution
If the refrigeration system is noisy the refrigeration system is malfunctioning. 3. Use a multi meter, check the voltage of the refrigeration system and for current leakage.. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.2.7 Current Leakage Test 3. refer to section 12.1.16 Refrigeration System Disassembly 4. After the refrigeration system malfunction is corrected, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.3.4 Refrigeration System Malfunction Classification Humidity
Check Point
Solution
Symptom Humidity Fluctuation
Problem Refrigeration System Malfunction, Endothermic Value Fluctuation
1. Turn the unit ON 2. Set the SV (set point value) temperature to 25 degrees Celsius 3. Check the pressure in the condenser tank. 4. If the pressure in the condenser tank reads low pressure, the refrigeration system is malfunctioning 1. Check the parts in the refrigeration system 2. Check the refrigerant level at ambient temperature 3. Check the condenser for dust.
Page 26 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Humidity Keeps Decreasing 2.4.1 Defective Chamber Fan Motor Classification Humidity
Check Point
Symptom Humidity Keeps Decreasing
Problem Defective Chamber Fan Motor
1. Turn the unit ON 2. Check if the chamber motor is running. 3. If the chamber motor does not run, use a multi-meter, and check the voltage output. If there is a voltage output reading, the chamber motor is defective. Replace the defective motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Fan Motor Disassembly 3. After replacing the defective chamber fan motor, follow the directions in reverse order and assemble the disassembled temperature/humidity unit to its original state.
2.4.2 Defective Humidity Sensor Classification Humidity
Symptom Humidity Keeps Decreasing
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. Check Point If the output DC 1~5V is out of range, the humidity sensor is defective... Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 27 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
“_ _ _ _” Display 2.4.1 Defective Humidity Sensor Classification Humidity
Check Point
Symptom “----” Display
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective. Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state. 2.4.2 High Humidity
Classification Humidity Check Point
Solution
Symptom “----” Display
Problem High Humidity
1. Set temperature/high temperature/high humidity, displays “----“ follow the solution steps below. 1. Turn the unit ON 2. Set the SV (set point value) temperature between 20- 25 degrees Celsius 3. Turn OFF the refrigeration system. 4. Leave open the chamber door and run the unit for 10 minutes. 5. Check the humidity on the display screen.
Page 28 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
3.0 Power No Power 3.1.1 Defective Circuit Breaker Switch Classification Power
Check Point
Symptom No Power
Problem Defective Circuit Breaker Switch
1. Go to the circuit breaker and turn the switch ON. 2. Use a multi meter, check the input AC voltage of the power outlet. 3. Check the output AC voltage on the output terminal of the circuit breaker switch inside the control panel of the unit. If there is a voltage reading for the input AC voltage and no voltage reading for the output AC voltage, the circuit breaker switch is defective. Replace the defective circuit breaker switch.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.2.1 Diagnostic Test 3. After replacing the defective circuit breaker switch, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
3.1.2 Misused Laboratory Power Source Classification Power
Symptom No Power
Problem Misused Laboratory Power Source
1. Use a multi meter, check the AC voltage from the power outlet. Check Point Solution
If there is no AC voltage reading or the AC voltage is reading high or low, there is a problem with the laboratory power source. 1. Notify facilities personnel.
3.1.3 Short or Loose Wire Terminal Classification Power
Symptom No Power
Problem Short or loose wire terminal
1. Use a multi meter, set to ohms, and perform a diagnostic/short test. Check Point If the resistance does not display on the multi meter one of the wires Page 29 of 65
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are disconnected 3. Check the ends of the wire terminals and make sure the ends of the wire terminals are properly secured on the tip of the wires. If the wire terminal is loose, take the wire crimp and recrimp the terminals, or replace the wire terminals from the wire with the loose wire terminal. Recrimp the loose wire terminals or replace the wire terminals from the wire with the loose wire terminal.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. Replace the wire with a short 3. Replace the old wire terminals with the new wire terminals. 4. After replacing the wire terminals or recrimping the loose wire terminals, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state
Page 30 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Power Shuts OFF After the Unit is Turned ON 3.2.1 Current Leakage from the Heater Classification Power
Check Point
Symptom Power Shuts OFF After the Unit is Turned ON
Problem Current Leakage from the Heater
1. Check for a blown fuse. 2. Disconnect the wires from the dry heater wire terminals. 3. Disconnect the wires from the humidity heater wire terminals. 4. Use a multi meter, measure the resistance of both the dry heater and humidity heater. To measure the resistance of the heater, place the red test probe pin on one of the heater wire terminals and the black test probe pin on the heater casing.
If resistance is measured from either the dry heater or humidity heater, whichever part measures resistance, that part is defective due to current leakage. Replace the defective heater.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.2 Rear Panel Disassembly 3. refer to section 12.1.8 Dry Heater Disassembly 4. refer to section 12.1.9 Humidity Heater Disassembly 5. After replacing the defective heater, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
3.2.2 Current Leakage from the Chamber Motor Classification Power
Check Point
Symptom Power Shuts OFF After the Unit is Turned ON
Problem Current Leakage from the Chamber Motor
1. Disconnect wires from the chamber motor wire terminals. 2. Use a multi meter, measure the resistance the chamber motor by placing the red test probe pin on one of the chamber motor wire terminals and the black test probe pin on the motor casing. If resistance is measured from the chamber motor, that part is defective due to current leakage. Replace the defective chamber motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to Page 31 of 65
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its original state.
3.2.3 Current Leakage from the Compressor Classification Power
Check Point
Symptom Power Shuts OFF After the Unit is Turned ON
Problem Current Leakage from the Compressor
1. Disconnect the wires from the Compressor. 2. Use a multi meter, measure the resistance of the compressor by placing the either of the black and red test probe pins on either of the compressor wire terminals. Measure the resistance in triplicates. If resistance is measured from the compressor, the compressor is leaking current. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.16 Compressor Disassembly 3. refer to section 12.2.7 Compressor Current Leakage Diagnostic Test 4. After replacing the defective component in the refrigeration system, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Solution
3.2.4 Current Leakage from the Water Supply Solenoid Valve Classification Power
Check Point
Symptom Power Shuts OFF After the Unit is Turned ON
Problem Current Leakage from the Water Supply Solenoid Valve
1. Disconnect the wires from water supply solenoid valve wire terminals. 2. Use a multi meter, measure the resistance of the water supply solenoid valve by placing the red test probe pin on one of the water supply solenoid wire terminals and by placing the black test probe pin on the metal exterior of the water supply solenoid valve. If resistance is measured from the water supply solenoid valve, the water supply solenoid valve is leaking current. Replace the defective water supply solenoid valve.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.15 Water Supply Solenoid Valve Disassembly 3. After replacing the defective water supply solenoid valve, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 32 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
4.0 ERR Over Temperature ERR 4.1.1 Wrong Over Temperature Sensor Setting Classification ERR
Check Point Solution
Symptom Over Temperature ERR
Problem Wrong Over Temperature Sensor Setting
1. Face the right side of the unit and check the setting of the over temperature sensor setting (150-155 degrees Celsius). 1. Move the over temperature sensor dial around 150-155 degrees Celsius. 2. refer to section 12.1.12 Over Temperature sensor Disassembly
4.1.2 Defective Chamber Motor Classification ERR
Check Point
Symptom Over Temperature ERR
Problem Defective Over Temperature Sensor
1. Use a multi meter, test the wire continuity on one of the (3) terminals by placing the test probe pins on opposite ends of the wires, 2. Place the test probe pins on the NC/NO terminals to measure the resistance. If one of the (3) terminals beep and there is resistance from the NC/NO, the over temperature is defective. Replace the defective over temperature sensor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.12 Over Temperature Sensor Disassembly 3. After replacing the defective over temperature sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
4.1.3 Defective Chamber Motor Classification ERR
Check Point
Symptom Over Temperature ERR
Problem Defective Chamber Motor
1. Check the value of the over temperature sensor setting. 2. Press and hold the RUN button until the unit starts. 3. Test the over temperature sensor by adjusting the setting to the current temperature in the chamber. 4. Check to see if the chamber motor is working. 5. If the chamber motor is not working check to see if the wires are properly connected and power is being supplied to the chamber motor. Page 33 of 65
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If there is proper power being supplied to the chamber motor, the chamber motor is defective. Replace the defective chamber motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
4.1.4 Defective SSR (solid state replay) Classification ERR
Symptom Over Temperature ERR
Problem Defective SSR (solid state relay)
1. Check the value of the over temperature sensor setting. 2. Turn the temperature/humidity unit ON 3. Set the SP (setpoint) temperature higher than the PV (process variable) temperature. 4. Use the PID (proportional-integral derivative) controller and check the output MV (manipulated variable) temperature.
Check Point
5. If the MV (manipulated variable) temperature is displayed on the PID (proportional-integral derivative) controller display, use a multi meter, set the multi meter to AC voltage mode, and measure the AC voltage output by placing the black and red test probe pins on the input of the SSR (solid state relay), as depicted in the picture above. If the AC voltage is displayed on the multi meter display, the SSR (solid state relay) is defective. Replace the defective SSR (solid state relay). Solution
1. refer to section 12.1.1 Control Panel Disassembly. 2. refer to section 12.1.4 SSR (solid state relay) Disassembly/Diagnostic Test. Page 34 of 65
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3. After replacing the defective SSR (solid state relay), follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 35 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Water Level ERR 4.2.1 Low Water Level Classification ERR
Check Point
Solution
Symptom Water Level ERR
Problem Low Water Level
1. Remove the cartridge from the water tank. 2. If the cartridge has water while the bottom does not have water, there is a problem with the water tank, the water tank cover needs to be fixed. 1. Check the water tank cover. 2. Check the water level to see if it floats. 3. Check the water supply solenoid valve.
4.2.2 Defective Water Level Classification ERR
Check Point
Symptom Water Level ERR
Problem Defective Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Move the water level up and down to check to see if the water supply solenoid valve and water pump is working. If the supply water solenoid valve and the water pump is not working, the water level is defective. Replace the defective water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.6 Water Level/Tank Disassembly 3. After replacing the defective water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
4.2.3 Dirty Water Level Classification ERR
Check Point
Symptom Water Level ERR
Problem Dirty Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Move the water level up and down to check to see if the water supply solenoid valve and water pump is working. Page 36 of 65
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If the supply water solenoid valve and the water pump is not working, the water level is dirty and must be cleaned. Clean the dirty water water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.5 Water Level/Tank Disassembly 3. After cleaning the dirty water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
4.2.4 Water Level Sensing Error Classification ERR
Check Point
Symptom Water Level ERR
Problem Water Level Sensing Error
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Move the water level up and down to check to see if the water supply solenoid valve and water pump is working. If the supply water solenoid valve and the water pump is not working, the water level is defective. Replace the defective water level.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.2 Rear Panel Disassembly 3. refer to section 12.1.5 Water Level/Tank Disassembly 4. After replacing the defective water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 37 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
Door ERR 4.3.1 Loose Door Sensor Wire Classification ERR
Symptom Door ERR
Problem Loose Door Sensor Wire
1. Check the door sensor Check Point
Solution
If the door sensor is loose, tighten or properly connect the door sensor wires to the door sensor wire terminals. 1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.3 Door Sensor Disassembly 3. After properly connecting the door sensor wires to the door sensor wire terminals, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
4.3.2 Defective Door Sensor Classification ERR
Check Point
Symptom Door ERR
Problem Defective Door Sensor
1. Use a multi meter, check the wire continuity by connecting the COM terminal to one of the (3) door sensor wire terminals. 2. Place the test probe pins on the NC/NO terminals to measure the resistance. If one of the (3) terminals beep and there is resistance from the NC/NO, the door sensor is defective. Replace the defective door sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.3 Door Sensor Disassembly 3. After properly connecting the door sensor wires to the door sensor wire terminals, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 38 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
5.0 Display Display Error 5.1.1 Defective Humidity Sensor Classification Display
Check Point
Symptom Display Error
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
5.1.2 Loose Humidity Sensor Wire Classification Display Check Point Solution
Symptom Display Error
Problem Loose Humidity Sensor Wire
1. Check the humidity sensor wire connection on the control panel 1. refer to section 12.1.1 Control Panel Disassembly 2. After tightening the loose humidity sensor wires, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 39 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
6.0 Noise Noise While the Unit is Running 6.1.1 Defective Chamber Motor Classification Noise
Symptom Noise While the Unit is Running
Problem Defective Chamber Motor
1. Check the chamber motor for interference. Check Point
Solution
If there is nothing interfering with the chamber motor, the chamber motor is defective. Replace the defective chamber motor. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
6.1.2 Defective Compressor Classification Noise
Symptom Noise While the Unit is Running
Problem Defective Compressor
1. Check the compressor for crushing noise. Check Point If there is crushing noise, the compressor is defective. Replace the defective compressor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.2.7 Compressor Diagnostic Test 3. refer to section 12.1.16 Compressor Disassembly 4. After replacing the defective compressor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
6.1.3 Compressor Overload Classification Noise
Symptom Noise While the Unit is Running
Problem Compressor Overload
1. Check the compressor for crushing noise. Check Point Solution
If there is crushing noise, the compressor refrigerant level is too high. Release some refrigerant from the compressor.
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Date: 04 Apr 11
1. refer to section 12.1.2 Rear Panel Disassembly 2. At 25 degrees Celsius the pressure reads higher than 20psi, release some refrigerant from the compressor until it reaches normal refrigerant pressure level. 3. After releasing some refrigerant from the compressor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
6.1.4 Loose Compressor Classification Noise Check Point
Solution
Symptom Noise While the Unit is Running
Problem Loose Compressor
1. Check the compressor for rattling noise. 2. Check the compressor to see if the compressor is properly secured 1. refer to section 12.1.2 Rear Panel Disassembly 2. Use an adjustable wrench to tighten the compressor unit to the refrigeration system platform. 3. After properly securing the compressor to the refrigeration system platform, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
6.1.5 Loose Chamber Motor Classification Noise
Symptom Noise While the Unit is Running
Problem Loose Chamber Motor
1. Check the chamber motor to see if the impeller is loose on the chamber motor shaft. Check Point
Solution
If the impeller is loose on the chamber motor, tighten the loose impeller on the chamber motor shaft. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.10 Chamber Fan Motor Disassembly 3. Tighten the loose impeller on the chamber motor shaft. 4. After tightening the loose impeller on the chamber motor shaft, follow the directions in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Page 41 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
7.0 Water Leakage Drain Valve Leakage 7.1.1 Dirty Water Supply Valve Classification Water Leakage
Check Point
Symptom Drain Valve Leakage
Problem Dirty Water Supply Solenoid Valve
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. While the feed pump is running, check to see if the water supply solenoid valve is working. 4. Use a multi meter, measure the input AC voltage (220-230V) of the water supply solenoid valve. If the there is voltage coming from the water supply solenoid valve and the water supply solenoid valve is working, the water supply solenoid needs to be cleaned. Clean the dirty water supply solenoid valve.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.15 Water Supply Solenoid valve disassembly 3. refer to section 12.3.4 Water Supply Solenoid Valve Components 4. After cleaning the dirty waters supply solenoid valve, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
7.1.2 Defective Water Level Classification Water Leakage
Check Point
Symptom Drain Valve Leakage
Problem Defective Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Check the water capacity in the inner bath. If the water level is below 5mm, the humidity, the water level needs to be adjusted. Adjust the water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.3.2 Water Flow/Tubing Diagram 3. refer to section 12.2.11 Inner Water Level Adjustment Page 42 of 65
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4. After adjusting the water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
7.1.3 Defective Water Level Classification Water Leakage
Check Point
Symptom Drain Valve Leakage
Problem Defective Water Level
1. Set the temperature below zero degrees and drain the water drain inner water chamber. 2. Input any humidity value, press and hold the RUN/STOP button until the unit starts running. 3. Move the water level up and down to check to see if the water supply solenoid valve and water pump is working. If the supply water solenoid valve and the water pump are not working, the water level is defective. Replace the defective water level.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.5 Water Level/Tank Disassembly 3. After replacing the defective water level, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Leaking from Base of Unit 7.2.1 Seal Problem Classification Water Leakage Check Point Solution
Symptom Leaking from Base of Unit
Problem Seal Problem
1. Check the welded parts and touch the insulation around it to see if the insulation material is wet or moist. 1. If there is a leak around the welded part use a silicone gun and seal the leak.
Page 43 of 65
Rev #: TH-ME-00
Date: 04 Apr 11
8.0 Current Leakage Activated Circuit Breaker Switch 8.1.1 Current Leakage from the Heater Classification Current Leakage
Check Point
Symptom Activated Circuit Breaker Switch
Problem Current Leakage from the Heater
1. Check for a blown fuse. 2. Disconnect the wires from the dry heater wire terminals. 3. Disconnect the wires from the humidity heater wire terminals. 4. Use a multi meter, measure the resistance of both the dry heater and humidity heater. To measure the resistance of the heater, place the red test probe pin on one of the heater wire terminals and the black test probe pin on the heater casing.
If resistance is measured from either the dry heater or humidity heater, whichever part measures resistance, that part is defective due to current leakage. Replace the defective heater.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.2 Rear Panel Disassembly 3. refer to section 12.1.7 Chamber Back Disassembly 4. refer to section 12.1.8 Dry Heater Disassembly 5. refer to section 12.1.9 Humidity Heater Disassembly 6. After replacing the defective heater, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
8.1.2 Current Leakage from the Chamber Motor Classification Current Leakage
Check Point
Symptom Activated Circuit Breaker Switch
Problem Current Leakage from the Chamber Motor
1. Disconnect wires from the chamber motor wire terminals. 2. Use a multi meter, measure the resistance the chamber motor by placing the red test probe pin on one of the chamber motor wire terminals and the black test probe pin on the motor casing. If resistance is measured from the chamber motor, that part is defective due to current leakage. Replace the defective chamber motor.
Solution 1. refer to section 12.1.2 Rear Panel Disassembly Page 44 of 65
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2. refer to section 12.1.10 Chamber Motor Disassembly 3. After replacing the defective chamber motor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
8.1.3 Current Leakage from the Compressor Classification Current Leakage
Check Point
Symptom Activated Circuit Breaker Switch
Problem Current Leakage from the Compressor
1. Disconnect the wires from the Compressor. 2. Use a multi meter, measure the resistance of the compressor by placing the either of the black and red test probe pins on either of the compressor wire terminals. Measure the resistance in triplicates. If resistance is measured from the compressor, the compressor is leaking current. 1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.16 Compressor Disassembly 3. refer to section 12.2.7 Compressor Current Leakage Diagnostic Test 4. After replacing the defective component in the refrigeration system, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Solution
8.1.4 Current Leakage from the Water Supply Solenoid Valve Classification Current Leakage
Check Point
Symptom Activated Circuit Breaker Switch
Problem Current Leakage from the Water Supply Solenoid Valve
1. Disconnect the wires from water supply solenoid valve wire terminals. 2. Use a multi meter, measure the resistance of the water supply solenoid valve by placing the red test probe pin on one of the water supply solenoid wire terminals and by placing the black test probe pin on the metal exterior of the water supply solenoid valve. If resistance is measured from the water supply solenoid valve, the water supply solenoid valve is leaking current. Replace the defective water supply solenoid valve.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.1.15 Water Supply Solenoid Valve Disassembly 3. After replacing the defective water supply solenoid valve, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state. Page 45 of 65
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8.1.5 Current Leaking from the Condenser Motor Classification Current Leakage
Check Point
Symptom Activated Circuit Breaker Switch
Problem Current Leaking from the Condenser Motor
1. Disconnect the wires from the condenser motor wire terminals. 2. Use a multi meter, measure the resistance of the condenser motor by placing the red test probe pin on one of the condenser motor wires and the by placing the black test probe pin on the condenser motor base. If there is resistance from the condenser motor, the condenser motor is leaking current. Replace the defective condenser motor.
Solution
1. refer to section 12.1.2 Rear Panel Disassembly 2. refer to section 12.2.8 Condenser Motor Diagnostic Test 2. refer to section 12.1.6 Condenser Motor Disassembly 3. After replacing the defective condenser fan, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
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9.0 RS Connection No Connection 9.1.1 Converter Classification RS
Check Point
Symptom No Connection
Problem Converter
1. Connect the unit to the computer. 2. Check to see if all 4 lights are on the converter are ON. If one light is not on the converter is OFF, the convertor is defective. Replace the defective converter.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. After replacing the defective converter, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
9.1.2 Loose Wire Classification RS Check Point Solution
Symptom No Connection
Problem Loose Wire
1. Check the wire connection on the converter. 1. refer to section 12.1.1 Control Panel Disassembly 2. After securing the loose wire, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
9.1.3 Wire Arrangement Classification RS Check Point Solution
Symptom No Connection
Problem Wire Arrangement
1. Check the wire arrangements on the RS port. 1. refer to section 12.1.1 Control Panel Disassembly 2. After screwing the wires in the correct arrangement, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
9.1.4 Wrong Parameter Settings Classification RS Check Point
Symptom No Connection
Problem Wrong Parameter Settings
1. Check the parameter settings. Page 47 of 65
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Solution
Date: 04 Apr 11
1. Input the correct parameter settings.
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10.0 Miscellaneous Internal Frost 10.1.1 Defective Humidity Sensor Classification RS
Check Point
Symptom Internal Frost
Problem Defective Humidity Sensor
1. Check the output DC 1~5V from the output terminal of the humidity sensor board. If the output DC 1~5V is out of range, the humidity sensor is defective. Replace the defective humidity sensor.
Solution
1. refer to section 12.1.1 Control Panel Disassembly 2. refer to section 12.1.11 Humidity Sensor Disassembly 3. After replacing the defective humidity sensor, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
Corrosion 10.2.1 Enviroment Classification RS Check Point
Solution
Symptom Corrosion
Problem Environment
1. Check the samples being used during high humidity tests. 1. Clean thoroughly inside the chamber and wipe away any corrosive substance from inside the chamber. 2. refer to section 12.1.7 Chamber Back Panel Disassembly 3. After wiping away the corrosive substances, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to its original state.
10.2.2 Evaporator and Circulation Fan Classification RS Check Point
Solution
Symptom Corrosion
Problem Evaporator and Circulation Fan
1. Check the evaporator and circulation fan for any corrosive substances. 1. Clean thoroughly inside the chamber and wipe away any corrosive substance from inside the chamber. 2. refer to section 12.1.7 Chamber Back Panel Disassembly 3. After wiping away the corrosive substances, follow the direction in reverse order and assemble the disassembled temperature/humidity unit to Page 49 of 65
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its original state.
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12.0 Dissambly Guide 12.1.1 Control Panel Disassembly
1. Use a “+” head screwdriver, unscrew the 4mm stainless steel truss head screws from the control panel cover.
12.1.2 Rear Panel Disassembly
1. Use a “+” head screwdriver, unscrew the 4mm stainless steel truss head screws from the back panel. 2. Use a 7mm hex socket driver, unscrew the 4mm hex nuts from the fan.
12.1.3 Door Sensor Disassembly/Diagnostic Test
1. Use a “-” head screwdriver, insert the “-” head driver into the side of the door sensor to release the door sensor tab. Page 51 of 65
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Diagnostic Test 2. Use a multi meter, set the multi meter to AC voltage setting, and check the AC voltage by placing red test probe tip on the wire terminal labeled L. S/W and the black test probe tip on the wire terminal labeled 00N, as depicted in the picture above.
12.1.4 SSR (solid state relay) Disassembly/Diagnostic Test
1. Use a “+” head screwdriver, unscrew (2) 4mm stainless steel pan head screws from the SSR (solid state relay) heater. Diagnostic Test 2. Use a multi meter, set the multi meter to AC voltage setting, and check the AC voltage of the SSR (solid state relay) terminals labeled TEMP, as depicted in the picture above.
12.1.5 Water Level Tank Disassembly/ Diagnostic Test
1. Face the back of the TH-ME unit, disconnect the water lever wires from the water level wire terminals. 2. Remove cover, if needed remove any contaminants or dust by using a dry dusting cloth.
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Diagnostic Test 3. Use a multi meter, set the multi meter to resistance mode, and place one red test probe pin on one of the water level wire terminal and the black test probe pin on the other water lever wire terminal, as depicted in the picture above. If there is resistance coming from the water, level the water level is defective.
12.1.6 Motor Fan Disassembly
1. Disconnect the motor fan wires from the motor wire fan terminals. 2. Use a”+” head screwdriver, unscrew (4) 4mm, stainless steel pan head screws from the motor fan.
12.1.7 Chamber Back Panel Disassembly
1. Face the front of chamber, use a “+” head screwdriver, and unscrew the 4mm stainless steel truss head screws from the chamber front panel.
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12.1.8 Dry Heater Disassembly
1. Use a “+” head screwdriver, unscrew (4) 4mm stainless steel truss head screws from the dry heater.
12.1.9 Humidity Heater Disassembly
1. Disconnect the humidity heater wires from the humidity heater wire terminals.
12.1.10 Motor/Fan Disassembly
1. Use a 7mm hex socket driver, unscrew (4) 5mm hex screws from the back chamber rear ring panel. 2. Use an Allen wrench, unscrew (1) hex socket screw from the fan impeller. 3. Use a “+” head screwdriver, unscrew the stainless steel truss head screws from the motor
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4. Use a “+” head screwdriver, unscrew the (4) 4mm stainless steel truss head screws from the motor bracket. 5. Use a “+” head screwdriver, unscrew the stainless steel pan head screws from the base of the motor.
12.1.11 Temperature Sensor & Humidity Sensor Disassembly
1. Face the side of the temperature humidity unit, remove the silicone around the temperature sensor and the humidity sensor. 2. Pull the temperature sensor out from the temperature sensor slot. 3. Pull the humidity sensor out from the humidity sensor slot.
4. Use a “+” head fist screwdriver, unscrew the wire terminal screws from the PID (proportional-integral control) wire terminals A07, B07, C07, and D07. 5. Disconnect the temperature humidity sensor input/output wires and humidity sensor harness from PID (proportional-integral control) and humidity sensor PCB (printed circuit board). 6. Use a “+” head screwdriver, unscrew (4) steel pan head screws from the humidity sensor PCB (printed circuit board).
12.1.12 Air & Water Over temperature Sensors
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1. Face the side of temperature humidity unit, use a “-” head screwdriver, and remove the dial knobs from the air and water over temperature sensors. 2. Disconnect the wires from air over temperature wire terminals. 3. Disconnect the wires from the water over temperature wire terminals. 4. Use a “+” head screwdriver, unscrew (2) stainless steel pan head screws from the control panel bracket. 5. Use a “+” head screwdriver, unscrew (2) stainless steel pan head screws from the control panel bracket.
12.1.13 Water Tank Disassembly
1. Slide the water tank away from the chamber, lift the plastic drawer rail tabs on both the left and right at the same time, and completely pull out the water tank. 2. Use a “+” head screwdriver and remove the 3x8 stainless steel truss head screws from the water tank top.
3. Use a multi meter, set the multi meter on resistance mode, measure the resistance of the two of the three water level wire terminals by placing the red and black test probe pins on two of the three water level wire terminals (while measuring the resistance move the water level up and down). 4. Move the black test probe pin on the last water level wire terminal and measure the resistance. If there is resistance at any of the water level wire terminals, the water level is defective. 5. Use a non-abrasive cloth and wipe and clean off the dust or dirt. 6. Use a multi meter and measure the resistance of the water pump by placing the red and black test probe pins on the water pump wire terminals. If there is resistance from the water pump, the water pump is defective.
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12.1.14 Fuse Disassembly
1. Turn the fuse holder counter clockwise to open the fuse cap. 2. Replace the defective fuse with a new fuse. 3. Lift the fuse holder top to remove the other type of fuse.
12.1.15 Water Supply Solenoid Valve Disassembly
1 Water supply Solenoid Valve 2 Drain water Solenoid Valve
1. Use a multi meter, set the multi meter on resistance mode, check the resistance of the water supply solenoid valve by placing the black test pin probe on one of the water supply solenoid valve wire terminals and by placing the red test probe pin on the metal surface of the water supply solenoid valve.
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2. Disconnect the silicone hose from the hose connection of the water supply solenoid valve. 3. Disconnect the water supply solenoid valve wire from the water supply solenoid valve. 4. Use a “+” head screwdriver, unscrew (2) truss head screws from the water supply solenoid valve bracket.
12.1.16 Compressor Disassembly
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12.2.1 Input AC Voltage Diagnostic Test
1. Use a multi meter, set the multi meter on AC voltage, measure the AC voltage input of the power outlet by placing the red and black test probe pins in each of the power outlet slits. 2. Use a multi meter, set the multi meter on AC voltage, measure the AC voltage on the magnetic relay locate on the control panel by placing the red and black test probe pins on each of the black wires. 3. Use a multi meter, set the multi meter on AC voltage, measure the AC voltage on the circuit breaker switch by placing the red test probe pin in the middle of the circuit breaker switch wire terminal and by placing the black test probe pin on either of the black wire circuit breaker switch wire terminals.
12.2.2 Output AC Voltage Diagnostic Test
1. Use a multi meter, set the multi meter on AC voltage, measure the AC voltage output by placing the red and black test probe pins on either of the SSR (solid state relay) wire terminals. 2. On the T terminal block, the dry heater wire is labeled as TEMP and the humidity heater wire is labeled as HUMI.
12.2.3 Blown Fuse Diagnostic Test
1. Use a multi meter, set the multi meter on resistance, measure the resistance of the fuse holders by placing the red and black test probe pins on either of the fuse holder wire terminals. If there is no resistance, the fuse is blown (fuse has a resistance of 3A).
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2. Use a multi meter, set the multi meter on resistance, measure the resistance of the glass fuse holders by placing the red and black test probe pins on either of the glass fuse holder wire terminals. If there is no resistance, the fuse is blown.
12.2.4 Heater Diagnostic Test
1. Use a multi meter, set the multi meter on resistance, measure the resistance of the humidity heater (wires labeled HUMI) by placing the red and black test probe pins on either of the humidity heater wire terminals. If there is no resistance, the humidity heater is defective. 2. Use a multi meter, set the multi meter on resistance, measure the resistance of the dry heater (wires labeled TEMP) by placing the red test pin probe on the wire labeled TEMP and by placing the black test probe pin on the wire labeled NOO. If there is no resistance, the dry heater is defective.
12.2.5 Current Leakage Diagnostic Test for Humidity Heater
1. Use a multi meter, set the multi meter on resistance with buzzer, measure the resistance of the humidity heater by placing the red and black test probe pins on either of the humidity heater wire terminals. If there is resistance (and a buzzing sound), the humidity heater is defective. 2. Use a multi meter, set the multi meter on resistance with buzzer, measure the resistance of the humidity heater by placing the red test probe pin on the nichrome wire on the humidity heater and the by placing the black test probe pin on the metal surface of the humidity heater. If there is resistance (and a buzzing sound), the humidity heater is defective.
12.2.6 Current Leakage Diagnostic Test for Chamber Motor
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1. Use a multi meter, set the multi meter on resistance with buzzer, measure the resistance of the chamber motor by placing the red test probe pin on the chamber motor base and by placing the black test probe pin on one of the chamber motor wire terminals. If there is resistance (and a buzzing sound), the chamber motor is defective.
12.2.7 Current Leakage Diagnostic Test for Compressor
1. Remove the wire casing cover. 2. Disconnect (3) wires from the compressor wire terminals.
3. Use a multi meter, set the multi meter on resistance with buzzer, measure the resistance of the compressor by placing the red test probe pin on the copper compressor pipe and by placing the black test probe pin on one of the compressor wire terminals.
12.2.8 Current Leakage Diagnostic Test for SSR (solid state relay)
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1. Use a multi meter, set the multi meter on resistance, measure the resistance of the glass fuse holders by placing the red and black test probe pins on either of the glass fuse holder wire terminals. If there is no resistance, the fuse is blown. 2. Use a multi meter, set the multi meter on AC voltage, and measure the AC voltage on the SSR (solid state relay) by placing the red and black test probe pins on either of the SSR (solid state relay) wire terminals.
12.2.9 Continuity Diagnostic Test
1. Use a multi meter, set the multi meter on resistance mode, test the wire continuity of all the wires while following the wiring map.
12.2.11 Water Level Adjustment
1. Use a “+” head screwdriver, adjust the height of the water tank level. 2. Set the water level 5mm from the overflow hole.
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12.3.1 Recharging and Releasing Refrigerant Gas Part A Connecting the Service Valve and Checking Refrigerant Gas Pressure
1. Use a manifold gauge, close the low and high pressure gauge. 2. Read the instructions carefully which are located on the side containing the service valve. 3. Use an adjustable wrench and unscrew the 14mm gauge nut on the service valve, and connect the low and high pressure manifold gauge to it. 4. Use an adjustable wrench, unscrew the 20mm main nut and use a 4mm Allen wrench and turn the Allen wrench clockwise to open the valve or counterclockwise to close the valve. Part B Recharging Refrigerant Gas in Compressor
1. Check the pressure in the compressor. 2. Disconnect the middle hose line and connect the middle hose to the refrigerant gas tank. 3. Open the valve on the refrigerant gas tank and use an Allen wrench and slowly turn the Allen wrench clockwise in the compressor to open the pressure valve and allow for the recommended amount of refrigerant gas, into the compressor. 4. After filling up the compressor with the right amount of refrigerant gas turn the Allen wrench counter clockwise and close the pressure valve.
12.3.2 Water Flow/Tubing Diagram
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12.3.3 PID (proportional-integral-derivative) Controller
How to perform A/T (auto tuning) 1. Select FIX mode 2. Set the SV (set point value) temperature and SV (set point value) humidity 3. Start temperature A/T (auto tuning) by touching the T-AT (temperature-auto tuning) 4. Check the temperature stabilization after A/T (auto tuning) has been completed (auto tuning time varies based on set temperature). 5. Start humidity A/T (auto tuning) by touching the H-AT (humidity-auto tuning). 6. Check the humidity stabilization after A/T (auto tuning) has been completed (auto tuning time varies based on
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set humidity).
12.3.4 Water Supply Solenoid Valve Assembly
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