Transcript
T157 Series Non-Digital, 3-Wire Floating Electronic Thermostat/Controller General Instructions
Application The T157 series microprocessor based thermostat/controller provide either three-wire floating or on/off control. The T157 series controls a variety of two-pipe and four-pipe fan coil units, air handling units, and various heating and cooling applications. The microprocessor combines a proportional plus intergral control algorithm with advanced adaptive logic. This provides control without the need for tuning or calibrating the control algorithm in the field. Use with valve or damper AC powered actuators that have a one to three minute stroke and no position memory when power is removed.
Heat
Off Cool
Hi
Med Low
Features • Heating and cooling outputs are individually
T157 Series
configurable for three-wire floating or on/off control in the normally open or normally closed modes
• Line voltage three-speed fan control • Remote setback capability from a time clock or facility management system (contact closure)
• Built-in purge cycle assists the controller to determine if the controlling agent is providing heating or cooling when configured as a two pipe/winter summer system
• Microprocessor eliminates the necessity for tuning or calibration
• Remote sensor (room) • Seasonal changeover sensor
Litho in U.S.A.
3-02
F-27023
SPECIFICATIONS Inputs Power Input: 20 to 28 Vac, nominal 24 Vac, 50/60 Hz. Power Consumption: 25 mA maximum at 24 Vac. Connections: Power, Up to 14 AWG wire. Control, Up to 14 AWG wire.
Outputs Electrical: Heat/Cool Output, Maximum 10 VA at 24 Vac.
Control Proportional Band: 2F degrees (1.1C degrees) for 3-wire floating. Operating Differential: 1F degree (0.6C degrees) for on/off. Setpoint Adjustment Range: 50 to 90°F (optional dial, 10 to 32°C). Changeover Deadband (TB157 Only): 3F degrees (1.6C degrees).
Enclosure Material: Rigid Vinyl. Finish: Cool gray.
Environment Temperature Limits: Shipping & Storage, -30 to 130°F (-34 to 55°C). Operating, 32 to 130°F (0 to 55°C). Shipping Weight: 0.31 lbs (140 g). Location: NEMA Type 1.
74 73 72 71 70 69 68 67 66 65 64
Room Temp
Valve Position
0
60
120 120 Time in Minutes
Figure-1 Typical T157 Performance Curve.
Agency Listings CE: Compliant.
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100 90 80 70 60 50 40 30 20 10 0
Valve Position (%)
Temp in Degrees F
Performance
240
Table-1 Fan Switch Current Ratings (Amps). Inductive Voltage
Resistive Amps
Pilot Duty
N/A
N/A
24 VA
5.8
34.8
6.0
125 VA
240
2.9
17.4
5.0
125 VA
277
2.4
14.4
4.2
125 VA
FLA
LRA
24
N/A
120
System outputs (heat and cool) are limited to 10 VA maximum load.
Table-2 Model Chart. Model
Outputs
Control Signal Options
Changeover
Fan Control
Setback
System Switches
TA157-002
Dual
1, 2, 3, 4
Manual
Hi-Med-Lo
None
Heat-Off-Cool
TA157-004
Dual
1, 2, 3, 4
Manual
Hi-Med-Lo
Yes
Heat-Off-Cool
TA157-005
Single Cooling
6
N/A
None
None
None
TA157-015
Single Cooling
6
N/A
Off-On
None
None
TB157-001
Dual
1, 2, 3, 4
Automatic
None
None
None
TB157-002
Dual
1, 2, 3, 4
Automatic
Hi-Med-Lo
None
On-Off
TB157-003
Dual
1, 2, 3, 4
Automatic
None
Yes
None
TB157-004
Dual
1, 2, 3, 4
Automatic
Hi-Med-Lo
Yes
On-Off
TB157-011
Single Cooling
5
N/A
None
Yes
None
1. 3-wire floating single stage cooling and 3-wire floating single stage heating.a 2. 3-wire floating single stage cooling and two stage on/off heating.a 3. Single stage on/off cooling, on/off fan control and 3-wire floating single stage heating.a 4. On/off single stage cooling, on/off single stage heating and fan control. 5. 3-wire floating single stage cooling only or on/off single stage cooling only. Celsius scale on dial. 6. 3-wire floating single stage cooling only or on/off single stage cooling only. a. Multiple configurations are possible by repositioning of one or more of the 6 dip switches residing in the lower left corner of the thermostat circuit board.
Accessories 65345 65406 65409 65410 65170 65860
4-3/4" x 4-3/4" adapter plate. Remote sensor, 60" leads 10k : @ 77°F (25°C) used for either a remote sensor or seasonal changeover sensor. Fahrenheit set point dial, 50 to 90°F. Celsius set point dial, 10 to 32°C. Warmer/cooler set point dial. Set point dial stop kit.
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TYPICAL APPLICATION (wiring diagram) Switched Power
1 2 3 4 5 6
L1 (HOT) LO MED
Fan
L2 OR Neutral
Connect for continuous fan
HI Fan Supply
7 8 9 10 11 12 13 14 15 16
Optional Remote Sensor
Optional Seasonal Changeover Sensor 24 V COM 24 V HOT 24 VAC XFMR
Setback Input Open
Main Output
Open Close
Secondary Output
Close
Figure-2 Typical Wiring For 3-Wire Floating Control.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Switched Power L1 (HOT) LO MED
Fan
L2 OR Neutral
Connect for continuous fan
HI Fan Supply
Optional Remote Sensor
Optional Seasonal Changeover Sensor 24 V COM 24 V HOT 24 VAC XFMR
1st Stage Secondary Output 2nd Stage Secondary Output
Main Output
Demand Output
Figure-3 Typical Wiring For On/Off Control.
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INSTALLATION Inspection Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and inspect the device for obvious damage. Return damaged products.
Requirements •
Tools (not provided): — Screw driver — Digital multimeter
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Training: Installer must be a qualified, experienced technician.
Precautions General
▼W A R N I N G •
Electrical shock hazard! Disconnect power before installation to prevent electrical shock or equipment damage.
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Make all connections in accordance with the electrical wiring diagram and in accordance with national and local electrical codes.
▼C A U T I O N •
Avoid locations where excessive moisture, corrosive fumes, explosive vapors, or vibration are present.
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Avoid electrical noise interference. Do not install near large conductors, electrical machinery, or welding equipment.
Federal Communications Commission (FCC) NOTE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in residential installations. This equipment generates, uses, and can radiate radio frequency energy and may cause harmful interference if not installed and used in accordance with the instructions. Even when instructions are followed, there is no guarantee that interference will not occur in a particular installation. If this equipment causes harmful interference to radio and television reception—which can be determined by turning the equipment off and on—the user is encouraged to try to correct the interference by one or more of the following measures:
• • •
Reorient or relocate the receiving antenna.
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Consult the dealer or an experienced radio/television technician for help.
Increase the separation between the equipment and receiver. Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
Canadian Department of Communications (DOC) NOTE This class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numerique de la classe B respecte toutes les exigences du Reglement sur le material broilleur du Canada. European Standard EN 55022
▼W A R N I N G This is a class B (European Classification) product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.
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NOTE The T157s are designed to control valve or damper actuators which stroke fully open or fully closed in a time frame of 1 to 3 minutes.
• •
The T157s cannot control actuators in which the motor is powered by DC voltage. Some AC powered actuators, route the AC power through a rectifier and deliver DC power to the motor.
•
The T157s cannot control actuators designed with position memory at power loss.
Mounting Mount the T157 series to a suitable surface. Standard holes are provided for mounting. P/N 65406 can be used for both the remote temperature sensor and the seasonal changeover sensor, refer to Figure-4. Do not mount on a surface that exceeds 130°F (55°C). Mount the thermostat five feet above the floor on an inside wall. Do not mount near a heat source (lamp or sunlight) or behind a door or furniture.
Figure-4 Mounting the T157.
Seasonal Changeover Sensor When installing the seasonal changeover sensor strap-on the sensor to the main coil input or a pipe that will determine the fluid temperature of the coil. If a well is available use thermal grease for a faster temperature response. Insulate the entire sensor and pipe two inches before and after the sensor for a total of approximately six inches. This insulation is used to decrease the affect of ambient temperature upon the sensor.
Remote Sensor Install the sensor in a location that will only measure the temperature to be sensed without any external heating or cooling sources influencing the sensor. Examples of sources to avoid are direct sunlight, mounting the sensor too low or too high on a wall, or any areas in ducts with dead air movement or un-mixed air. Be aware of any room stratification and air movement when determining the remote sensor location.
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SETUP Program Dip Switches Off On 1 Secondary N.C. Secondary N.O. 2 Main N.C. 3 Unused
Main N.O. Unused
4 Secondary 3-Wire 5 Main 3-Wire 6 Setback
Secondary On/Off Main On/Off Setback Cooling 85 0F (29 0C) 0
0
Cooling 90 F (32 C) 0 0 Heating 50 F (10 C)
0
Heating 60 F (16 C)
On Off
0
123456
Older styles will have cuttable jumpers. Uncut = On, Cut = Off.
Figure-5 Field Selectable Control Options.
WIRING When no changeover sensor is used the main output is associated with the cooling device and the secondary output is associated with the heating device. On a single output TB157 unit connecting a wire between terminals 8 and 9 forces the unit into the heating mode. By connecting a wire between therminals 8 and 9 on the dual output units, the main output is associated with the heating device and the secondary output is disabled.
NOTE Reconfigure dip switches as necessary to create desired control logic. See Figure-5.
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Some older models in the field may have cuttable jumpers instead of dip switches.
In all applications run the sensor wire away from any electronic noise generating devices, such as motors, fluorescent lights, and microwaves. Do not run in parallel to line voltage wiring. Following these rules, the maximum length of non-shielded sensor wire should not exceed 25 ft. Even if the sensor wire is not near any noise-generating devices, it still acts like an antenna and picks up background noise that is read by the microprocessor. In an electronic noisy environment or if the sensor wire must be located close to noisegenerating devices, always use shielded wire and connect the shielding to an earth ground. Even when using shielded cable try to avoid electronic noise generating devices. If shielded cable is being used and is properly ground, the maximum length of the shielded sensor wire should not exceed 100 ft.
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Terminal Description CONNECTIONS 16 Main Open 15 Secondary Open 14 Main Close 13 Secondary Close 12 Setback Input (Dry Contacts) 11 24 VAC HOT 10 24 VAC Common 9 Changeover Sensor 8 Remote Sensor & Changeover Sensor 7 Remote Sensor 6 Fan Supply 5 Fan High 4 Fan Medium 3 Fan Low 2 L1 (Hot) 1 Switched Power
Note: 24V hot and common must be continuously applied to the T157.
JP1: Remove jumper to allow use of remote probe #65406.
Figure-6 Terminal Definitions.
Fan Switch Logic If equipped with a fan switch, fan operation may be continuous or demand.
Continuous Fan For continuous fan operation note that a jumper wire is required on the fan terminal block from terminal 1 to terminal 6.
Demand Fan The fan cycles on and off with calls for heating or cooling. To wire for demand fan, fan power L1, must be controlled by normally open relay contacts. The relay coil will be powered from terminal 15, the demand terminal on the T157. Terminal 15 may not be available in all applications.
Set Back Operation Logic In setback mode all outputs operate in on/off logic even if configured as three wire float outputs. The setback or unoccupied mode works when a contact closure occurs between thermostat terminal 10, common, and terminal 12, set back. The thermostat will control at the unoccupied set point while the contact is closed. The unoccupied default control points are 90°F cooling, and 50°F heating. Dip switch selectable alternative unoccupied control points are 85°F cooling, and 60°F heating. Heat mode cycles in on/off style with a three degree additive differential. For example if in heat mode with a 50°F set point the heat will cycle On when the temperature drops to 50°F and will cycle Off when the room temperature reaches 53°F. Cooling mode cycles in on/off style with a three degree subtractive differential. For example in cooling with an unoccupied set point of 90°F, the cooling will cycle on when the room temperature reaches 90°F and cooling will cycle off when the room temperature reaches 87°F.
System Switch Logic The T157 may be equipped with a system switch. When the system switch is off both the system output and the fan output is off or disabled.
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Rotary Set Point Dial Travel Limitation Adjust the set point dial only when the dial is installed through the T157 cover. If adjusting the set point while the cover is off, there is no travel stop to keep the dial from moving clockwise past the 90°F position. This will force the thermostat into a factory test mode. This test mode has no field diagnostic value and will take up to half an hour to run its course, randomly checking inputs and outputs. If test mode is accidentally enabled, power down the T157, put the cover back on, reorient the set point dial and then reapply power to the unit. If it is still necessary to remove the cover to check outputs, make sure that the set point dial shaft remains within the 50°F to 90°F range.
Three Wire Float Logic If any or all outputs are configured for 3-wire floating control on power up or start up, the controller will power the close signal for 3 minutes and then resume normal controller 3-wire float output logic. 3-wire float logic is a modulating style of control which will reposition a valve or control device every time there is a change or difference between set point and actual room temperature. At various points in the control sequence, the valve will reposition, stop and float in it’s existing position until there is another change in the set point relative to actual ambient temperature. This 3-wire float logic is controlled by a proportional plus integral algorithm. The proportional band is two degrees and the valve will be fully closed when the set point is satisfied. For example, as the control point or room ambient temperature begins to move below the set point the valve begins to open allowing heating medium to heat the space. As the control point varies between 0 and 2 degrees from the set point, the valve will reposition toward close or open, stop, float then reposition as needed. At 2 degrees or more below set point, the valve will be fully open. Whether in heating or cooling if the space temperature is 1 or more degrees from set point, the T157 output is pulsed in 6 second increments up to a maximum run time of 3 minutes when the valve would be fully open or fully closed. If the space temperature is less than 1 degree from set point, the T157 pulses the output in 1.2 second increments.
On/Off Operating Logic At set point both the heating and cooling outputs will be off. In cool mode when the room ambient temperature is 1F degree above the set point, the cooling output is energized. The valve will remain energized until the room temperature falls to the set point. In heat mode when the room ambient temperature is 1F degree below the set point, the heating output is energized. The valve will remain energized until the room temperature rises to the set point. If two stage heating is configured, the first stage is energized at 1F degree below set point, the second stage is not energized until or unless the temperature falls to 3F degrees below set point. The first stage remains energized until set point is reached. The second stage cycles off at 1F degree below set point.
Seasonal Changeover With the 65406 Sensor The seasonal changeover logic will compare the sensed temperature at the pipe sensor with the actual ambient room temperature as measured by the onboard thermistor in the thermostat. When the changeover sensor is at 15F degrees above room ambient temperature, the T157 will control in heating mode. When the changeover sensor is at 15F degrees below room ambient temperature, the T157 will control in cooling mode. During initial startup the thermostat determines the resistance value wired across terminals 8 and 9.
Below 350 Ohms There is a jumper wire across terminals 8 and 9 which locks the thermostat into a heating only logic. Both the single or dual output thermostats will be configured as single output heating only thermostats. The heating output will be the main and only output. The processor will not check the status of the changeover terminals.
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Over 350,000 Ohms There is neither a jumper wire or a 65406 thermistor installed across terminals 8 and 9. The heating and/or cooling outputs will work normally. The main output is for cooling and the secondary output is for heating.The processor will not check the status of the changeover terminals.
Between 350 Ohms and 350,000 Ohms There is a 65406 thermistor installed across terminals 8 and 9 of the thermostat. The processor will poll the resistance once every second and will then authorize the main output to control in either heating or cooling depending on the continuously changing value of the resistance.
MAINTENANCE The T157 series requires no maintenance. Replace defective units. Regular maintenance of the total system is recomended to assure sustained, optimum performance.
FIELD REPAIR None. Replace any damaged or failed units with functional replacements.
DIMENSIONAL DATA 2-3/4 (70)
1 (25)
4-1/2 (114) 3-5/16 (84) 2-1/8 (53)
11/32 (9)
OPENING FOR WIRING
Figure-7 T157 Series Dimensions.
10
1/2 (13)
MOUNTING SLOTS (2) 5/32 X 3/8 REF. (4 X 100)
3/16 (5) DIA. BLIND HOLE 10 PLACES
4-3/4 (120)
1/8 (3) DIA. BLIND HOLE 2 PLACES
1-13/16 (46)
3-1/4 (83)
1-13/16 (46) 3-1/4 (83) 4-3/4 (120)
WALL PLATE (BACK VIEW)
Figure-8 Adapter Plate Dimensions.
Figure-9 Remote Sensor.
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