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T7351 Commercial Programmable Thermostat
FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP SYSTEMS
PRODUCT DATA
FEATURES
• Typically used in buildings (including: restaurants,
shopping malls, office buildings and banks) under
55,000 square feet.
• For single zone rooftop units, split systems, heat
pumps or hot/chilled water systems.
• 365-day programming.
• Two Occupied and two Not Occupied periods per day.
• Individual heat and cool setpoints available for
Occupied and Not Occupied periods.
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT SPECIFICATIONS IMPORTANT Models: See Table 1. The specifications given in this publication do not include normal manufacturing tolerances. Therefore, Dimensions: Refer to Fig. 1. this unit might not exactly match listed specifications. This product is tested and calibrated under closely Finish (color): Trident White. controlled conditions; minor performance differences can be expected if those conditions are changed. Batteries: No batteries required T
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 2. Default Setpoints. INSTALLATION Control Occupied Not Occupied Standby Heating 70° F (21° C) 55° F (13° C) 67° F (19° C) When Installing this Product... Cooling 75° F (24° C) 85° F (29° C) 78° F (26° C) 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 2-3/16 (56) 1-9/16 2. Check ratings given in instructions and on the product to 6-3/4 (171) (40) ensure the product is suitable
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT 1. Position and level the subbase. CAUTION NOTE: A level wallplate is only for appearance. The Equipment Damage Hazard. thermostat functions properly when not level. Can damage the TIM connection beyond repair. Disconnect the TIM cable prior to opening or closing 2. Use a pencil to mark the mounting holes. the thermostat cover. (Refer to Fig. 6.) 3. Remove the subbase from the wall and drill two 3/16 in. NOTE: Allow sufficient clearance below the ther
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Follow equipment manufacturer wiring instructions when SUBBASE available. Refer to the Wiring Diagram section for typical T4 T3 hookups. A letter code is located near each terminal for identification. Refer to Tables 3 for terminal designations. TR21 TR21 TR21 1. Loosen subbase terminal screws and connect system TT TT TT wires. 2. Securely tighten each terminal screw. 3. Push excess wire back into the hole in the wall. 4. Plug the hole with nonflamma
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT a Factory jumper between RC and RH for systems with one SETTING transformer. b For changeover functional details, see Operation section. c Using Thermostat Keys HC connection is not needed when using a TR23-H sensor. The thermostat keys are used to: • set current time and day, Mounting Thermostat on Subbase • program times and setpoints for heating and cooling, • override the program temperatures, (Fig. 7) • display present setting, With the subbase i
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 4. T7351 Intelligent™ Fan ON control logic Call for Occupancy Heat/Cool Scheduled Motion Sensor Effective Period Signal Occupancy Yes No Notes Occupied No Sensor Wired Occupied Fan On Fan On Occupied Motion Sensed Occupied Fan On Fan On Effective Occupancy is Standby. Standby setpoints are used and it assumes that the a Occupied No Motion Sensed Standby Fan On Fan Off space is unoccupied. Fan is on only when there is a call for heating or coolin
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT a. If you want to save the new configuration, use the up NOTE: Installer Setup is automatically exited after five or down key to change NO to YES before minutes with no key pressed. Upon this automatic pressing Run Schedule. exit, all changes are lost. b. If you want the configuration to remain as it was before starting this change, ensure the display indicates SAV CFG NO and press Run Schedule. Configuration Configuration can be done with the key
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. Installer Setup. (Continued) Text Default Choices Notes OATSENS 0 0 - 1 Outdoor Air Sensor Selection 0: None 1: Remote Outdoor Air Sensor DATSENS 0 0 - 1 Discharge Air Sensor Selection 0: None 1: Remote Discharge Air Sensor HUMSENS 0 0 - 2 Room Humidity Sensor selection 0: None 1: On Board Sensor 2: Remote Sensor OCCSENS 0 0 - 1 Occupancy Sensor Selection 0: None 1: Remote Occ Sensor FAN HT 0 0 - 1 Fan Operation on Heat 0: Conventional (Equipment
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. Installer Setup. (Continued) Text Default Choices Notes DAT HL NO YES or NO Discharge High Limit (Only displayed if Discharge Air Sensor is Selected) NO: None YES: Enabled DATHLSP 110° F 65° - 140° F Discharge High Temperature Limit (43° C) (18° - 60° C) (Display only if Discharge Sensor is configured) DEHUMID 0 0 - 5 Dehumidification 0: None 1: MinOn Time 2: Reset Temp Setpoint 3: Reset w/ MinOn 4: Reheat 5: Reheat w/ Min On DEH MIN 5 5 - 15 Deh
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT 4. Use the Up/Down keys to set the day, then press the The first holiday is now set and pressing the key will take key (Refer to Table 6 for valid day choices). you to programming the second holiday (denoted by the 5. Use the Up/Down keys to set the duration. number 2 on the screen) Table 6. Valid Day Values. Value Description Value Description 1 to 31 Day of month 42 Second Tuesday 53 Third Saturday 64 Fifth Wednesday 32 Last Day of Month 43 Second W
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 7. T7351 Key Function Summary. (Continued) Grouping Button Definition a Schedule Fan Selects fan operation mode. Toggles between On and Auto. Run Schedule Resumes running schedule (cancels Temporary Occupied action, Holiday, and/or Temporary setpoint changes.) a On: Continuous fan operation during occupied periods. During not occupied periods and in standby mode when no motion is sensed, fan cycles with call for heat or cool. Auto: Fan cycles with
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT NOTE: In the items that follow, the term “error” refers to the T7351 Relay Logic difference between the measured space temperature All T7351 model thermostats contain at least four switching and the current actual space temperature setpoint: relays. In conventional applications, the relays control first stage cooling, first stage heating, fan, and auxiliary. In heat — The Throttling Range (TR), also called Proportional Gain, pump applications, the r
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT — Recovery ramping applies between scheduled NOTE: The setpoint used during the cool recovery period is heat or cool setpoint changes from not occupied to similar to the heat mode in Fig. 10, except the slope standby and not occupied to occupied. of the line reverses for cooling. — Other setpoint changes use a setpoint step change. COOL RECOVERY RAMP RATE (DEGREES/HOUR) Recovery Ramping for Heat Pump Systems MaxClRamp During recovery with heat pump e
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT control. The potentiometer adjusts the minimum position of the The T7351 can take advantage of an economizer by closing economizer dampers, which provide a minimum amount of the auxiliary relay contacts to control the economizer minimum fresh air for ventilation. position potentiometer. (See Table 8 for details.) The economizer reduces compressor run time, thereby saving — Powered: Allows normal economizer operation. energy and extending compressor life
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 9. Default Auxiliary Relay Operations. Heat Pump or Contact Not Used as Conventional Heat or Cool Stage Contact Configuration of Contact Not Used as Stage Heat Pump Y3 Simple Simple Time of Day Time of Day a a Dehumidification Dehumidification W2 not aux heat Economizer Time of Day Economizer Economizer Conventional W3 not Simple Simple Simple Time of Day a a a Dehumidification Dehumidification Dehumidification Y3 not (W3 not) Economizer Time of Da
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT DEHUMID HOT GAS BP Auxiliary output during call for multiple cooling stages for two reasons: The auxiliary output operates as shown in Table 10. 1. This method assumes that the cooling provides dehumidification. Table 10. Hot Gas Bypass Dehumidification Logic. 2. Multiple cooling stages probably provide necessary Humidity Cooling Stages Active Auxiliary Output dehumidification. High more than one De-energized NOTE: Hysteresis and a minimum timer preven
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 11. Troubleshooting Information. (Continued) Symptom Possible Cause Action Heat will not come No power to the thermostat. Check that X terminal is connected to the system on. transformer. Check for 24 Vac between X and RH terminals. If missing 24 Vac: • Check if circuit breaker is tripped; if so, reset circuit breaker. • Check if system fuse is blown; if so, replace fuse. • Check if the HVAC equipment power switch is in the Off position; if so, s
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT WIRING DIAGRAM (FIGURES 14 AND 15) TR23-H REMOTE SENSOR OUTDOOR AIR COMPRESSOR SENSOR CONTACTOR 2 1 2 3 4 5 6 7 8 9 10 11 12 DISCHARGE HEAT HEAT AIR RELAY 3 RELAY 2 SENSOR SUBBASE T5 T6 T7 T4 T3 OS OS AS AS W3/Y4 Y3 W2 Y2 5 HS HC HP M M X RH RC AUX W1 Y1 G COMPRESSOR CONTACTOR 3 3 HEAT HUMIDITY FAN MOTION RELAY 1 SENSOR RELAY SENSOR COMPRESSOR 4 CONTACTOR 1 L2 1 2 ECONOMIZER L1 (HOT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQ
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23-H REMOTE SENSOR OUTDOOR AIR COMPRESSOR SENSOR CONTACTOR 2 1 2 3 4 5 6 7 8 9 10 11 12 DISCHARGE AUX HEAT AIR SENSOR STAGE 1 SUBBASE T5 T6 T7 T4 T3 OS AS OS AS W2 W1 Y2 4 HS HC HP MM X RH RC AUX O/B Y1 G 2 CHANGE- FAN HUMIDITY MOTION OVER RELAY SENSOR SENSOR COMPRESSOR CONTACTOR 1 3 L2 L2 ECONOMIZER 1 1 L1 L1 (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
