Transcript
INSTRUCTIONS FOR LT601 & LT1201 COOLED INCUBATORS FITTED WITH JUMO dTRON 16.1, MTW12 OVER / UNDER TEMPERATURE SAFETY CUT OUT, & SDU12 DIGITAL FRIDGE THERMOSTAT
PLEASE READ THIS MANUAL BEFORE USE
1.0
LT601 AND LT1201 FEATURES
2.0
INSTALLATION & PRECAUTIONS
3.0
INITIAL SET UP PROCEDURE
4.0
SETTING AN OPERATING TEMPERATURE
5.0
MAINTENANCE & CIRCUIT DIAGRAMS
Revised August 2001 LEEC Limited Private Road No.7 Colwick Industrial Estate Nottingham NG4 2AJ Tel. 0115 961 6222 Fax. 0115 961 6680 Web http://www.leec.co.uk E-mail
[email protected]
1
1.0
INCUBATOR FEATURES The LT601 and LT1201 Cooled Incubators are constructed entirely from stainless steel. They have highly efficient Polyurethane foam insulation. The refrigeration & electrical control system is located on top of the main body, behind the electronic control panel.
1.1
HEATING & COOLING The unique LEEC temperature control system ensures exceptionally good temperature performance. A powerful built in refrigeration system provides cooling and low wattage electric heaters provide heating. A micro switch stops the internal fan when the door(s) is opened to minimise temperature disturbance.
1.2
TEMPERATURE CONTROLLER The temperature is accurately controlled by a Jumo dTRON 16.1 microprocessor controller. The Jumo dTRON 16.1 uses a signal from a PT100 sensor, which is located inside the chamber. The controllers purpose is to control the cooling system switching and the current supplied to the heaters.
1.3
MTW12 OVER AND UNDER TEMPERATURE CUT OUT An MTW12 digital over and under temperature cut out protects the products in the LT601 & LT1201 chamber by allowing the user to set over and under temperature safety cut out values. When the chamber temperature goes out of limits, the relevant cut out will disconnect either the heating or the cooling system. A red neon will illuminate to indicate which system has gone out of limits. Reset buttons are provided next to the red neon’s for the user to manually reset the ‘out-of-limits’ system.
1.4
SDU12 DIGITAL FRIDGE THERMOSTAT (UNDER THE FLAP) An SDU12 digital fridge thermostat (underneath the lift up flap) controls the amount of cooling that the fridge system supplies. The amount of cooling required depends on two important factors: • •
The ambient temperature in the laboratory The chamber operating temperature required
As a general rule, the thermostat needs to be set to 5° below the required chamber operating temperature.
2
2.0
INSTALLING THE LT601 AND LT1201 The LT601 and LT1201 have a factory fitted UK 3 pin moulded plug. The wires in the plug and supply cable are colour coded as follows: • • •
Brown Blue Green / Yellow
= = =
Live Neutral Earth
The LT601 and LT1201 require a 240V 50Hz supply. The mains plug is fitted with a 13 Amp fuse. 2.1
REFRIGERATION PRECAUTIONS •
Before the incubator is switched on, it should be left for 2 hours after final positioning to allow the refrigerant to settle.
•
Do not place the incubator in direct sunlight.
•
A qualified electrician or other competent person must carry out any electrical work required to install the incubator.
•
Make sure that the incubator is not standing on its electrical supply cable.
•
Keep all ventilation grilles clear. The compressor gives off heat when operating. Always ensure there is adequate ventilation around the incubator. Failure to do so may result in component failure.
•
Before any cleaning or maintenance work is carried out, the mains supply must be switched off and the plug removed from the electrical socket.
3
3.0
INITIAL SET UP PROCEDURE Switch the incubator on using the Power On switch located on the left hand side of the control panel. The green neon inside the switch will illuminate when the supply is connected, and the switch is in the down (ON) position.
3.1
The refrigeration switch will need to be ON if the required chamber temperature is below the ambient temperature of the laboratory.
3.2
The chamber circulating fan will operate when: • The power switch is ON • The outer door(s) is closed
3.3
MTW12 OVER AND UNDER TEMPERATURE SAFETY CUT OUT An MTW12 over and under temperature digital safety cut out unit with a red LED display provides over and under temperature protection for the chamber contents. The cutout has two buttons that allow the user to program over and under temperatures cut out values:
3.4
•
Thermometer - Sets the over temperature cut out set point when used with the ^ or v buttons.
•
L2 - Sets the under temperature cut out set point when used with the ^ or v buttons.
SETTING THE OVER TEMPERATURE CUT OUT VALUE If, for example, you would like your incubator to operate at a chamber temperature of +20°C, an over temperature cut out value will need to be programmed into the cut out. We recommend that the over temperature cut out value is set to 2 degrees higher than the chamber operating temperature. In this example, the over temperature cut out set point needs to be set to +22°C. To set this follow steps 1 - 3 below: 1)
Press & hold the Thermometer button.
2)
Whilst holding the Thermometer button down, press the ^ button to increase the displayed value or the v button to decrease.
3)
Once the value of your choice is displayed, release the Thermometer button. The new value will be stored and retained in permanent memory.
4
3.5
SETTING THE UNDER TEMPERATURE CUT OUT VALUE If, for example, you would like your incubator to operate at a chamber temperature of +20°C, an under temperature cut out value will need to be programmed into the cut out. We recommend that the under temperature cut out value is set to 2 degrees lower than the chamber operating temperature. In this example, the under temperature cut out set point needs to be set to +18°C. To set this follow steps 1 - 3 below: 1)
Press & hold the L2 button.
2)
Whilst holding the L2 button down, press the ^ button to increase the displayed value or the v button to decrease.
3)
Once the value of your choice is displayed, release the L2 button. The new value will be stored and retained in permanent memory.
3.6
OVER AND UNDER TEMPERATURE NEONS & RESET BUTTONS If the chamber temperature goes out of limits, one of two red neon’s will illuminate. If the over temperature system is tripped, the heaters will automatically disconnect to prevent further overheating. If the under temperature system is tripped, the cooling system will continue to operate. In both situations the neon’s will remain on until the user has acknowledged the alarm. To reset the system, press the black reset button next to the illuminated neon.
3.7
SDU12 DIGITAL FRIDGE THERMOSTAT Under the flap on the right hand side of the control panel is a SDU12 digital fridge thermostat. The controller has 3 buttons: THERMOMETER ^ v
-
Enters the programming mode Increases the displayed value Decreases the displayed value
3.8
The thermostat will need to be set 5° below the required chamber temperature. If, for example, the chamber operating temperature you require is +20°C, the fridge thermostat needs to be set +15°C.
3.9
To alter the thermostat setting, lift the flap, press & hold down the Thermometer button and use the ^ button or the v button to change the set point. When a value has been entered, release all buttons. The new value will be stored in memory automatically.
5
4.0
SETTING AN OPERATING TEMPERATURE The Jumo dTRON 16.1 microprocessor temperature controller fitted to the LT601 and LT1201 has a two colour LED display. The upper display (red) represents the actual chamber temperature. The lower display (green) represents the target temperature. The controller has 4 buttons marked as follows: PGM ^ v EXIT
-
Program (Enters the programming mode) Increases the chamber temperature Decreases the chamber temperature Exits the programming mode
4.1
To adjust the chambers target temperature, press the ^ key to increase the temperature or the v key to decrease the temperature. The green display will blink once to confirm the parameter has been accepted, and the current chamber temperature will be displayed in red.
4.2
Three yellow LED's on the Jumo dTRON 16.1 controller are labelled K1, K2 & K3. These LED's may be on, off or flashing. The LED's represent: K1
-
Heating If the K1 LED is off, the heaters are off. If the K1 LED is on, the heaters are on. If the K1 LED is flashing, the target temperature has been reached.
K2
-
Cooling If the K2 LED is off, cooling is not being supplied to the chamber. If the K2 LED is ON, cooling is being supplied to the chamber. The K2 LED will not flash.
K3
-
Not used This LED has no function on the LT601 and LT1201 and should not illuminate.
6
5.0
MAINTENANCE The chamber should be defrosted if there is a build up of ice in the air duct as this will restrict the airflow and affect the incubators performance. To do this, choose one of the following methods: 1) Switch the refrigeration switch OFF and raise the operating temperature of the incubator to +50°C for several hours. 2) Switch the cabinet off completely disconnecting it from the electrical supply and leave the outer door(s) open over night. BE AWARE THAT WATER MAY APPEAR INSIDE YOUR INCUBATORS CHAMBER DURING A DEFROST CYCLE. USE A SPONGE TO SOAK UP EXCESS WATER.
5.1
Regular cleaning & de-fluffing of the condenser is recommended. Keep all ventilation grilles clear & unrestricted. The inner chamber & exterior of your incubator can be cleaned with a damp cloth and a mild detergent solution. The exterior can be cleaned with for example 3M Stainless Steel Spray Polish. DO NOT USE BLEACH OR CHLORINE BASED CLEANERS ON STAINLESS STEEL SURFACES. DO NOT USE SCOURING PADS ON STAINLESS STEEL SURFACES.
5.2
In the event of spillage of hazardous materials use the appropriate decontamination method as prescribed by the HSE or local Safety Officer. If you require any further advice, contact LEEC on 0115 961 6222.
7
