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T7351 Commercial Programmable
Thermostat
FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP
SYSTEMS
INSTALLATION INSTRUCTIONS
Location
APPLICATION
Do not install the thermostat where it can be affected by:
drafts, or dead spots behind doors and in corners.
The T7351 Commercial Programmable Thermostat
hot or cold air from ducts.
controls 24 Vac commercial single zone heating,
radiant heat from sun or appliances.
ventilating and air conditioning (HVAC) equipment. The
concealed pipes and
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT SUBBASE T4 T3 YES NO T7770A T7770A TT T T NO NO 5 FEET (1.5 METERS) T7770A T7770A T T T T M4823A Fig. 1. Typical location of thermostat or remote-mounted sensor. M19606A Mounting Subbase Fig. 2. Four T7770A Sensors providing temperature The subbase mounts horizontally. averaging network for T7351 Thermostat. IMPORTANT When using the internal temperature or humidity sensor, the device must be mounted horizontally (with the LCD facing upwards). Precis
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT SETTINGS A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE. Using Thermostat Keys The thermostat keys are used to: set current time and day, program times and setpoints for heating and cooling, override the program temperatures, display present setting, set system and fan operation. NOTE: See Fig. 5 for keypad information. Setting Temperature Refer to Table 2 for the default temperature setpoints. To set the Occupied and Not Occupie
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Temperature Set Day/Time Override Temporary Temporary Occupied Not Occupied Day Time Occupied Not Occupied HEAT COOL HEAT COOL Schedule System Fan Run Clear ON AUTO Schedule Day Occupied Not Occupied Start Time Copy HEAT COOL M19610 Fig. 5. Thermostat key locations. Setup Using Keypad INSTALLER SETUP The installer uses the Installer Setup to customize the thermostat to specific systems For most applications, the thermostat factory settings do not need t
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. Text Default Choices Notes DEGREES 0 0 -1 Degree Temperature Format 0: Degrees F 1: Degrees C CLOCK 0 0 - 1 Clock Display Format 0: 12 hour 1: 24 hour KEYLOCK 0 0 - 3 Keypad Lockout Level 0: None 1: Lockout all keys except Set Day, Set Time, Set Date, Set Holidays, Temporary Occupied, Temporary Not Occupied, System, Fan, Up, Down and Information 2: Lockout all keys except Set Day, Set Time. Set Date, Set Holidays, Temporary O
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. (Continued) Text Default Choices Notes XFAN HT YES YES or NO Extended Fan on Heat NO: None YES: 90 seconds XFAN CL NO YES or NO Extended Fan on Cool NO: None YES: 40 seconds STRTDEL 0 0 - 15 Sequential Start Delay 0 to 150 seconds in 10 second increments ADVANCE NO YES or NO Advanced Settings NO: Hide YES: Show TMP LIM 3 0 - 5 Temporary Setpoint Adjustment 0: 0 Deg. F 1: 1 Deg. F 2: 2 Deg. F 3: 3 Deg. F 4: 4 Deg. F 5: 5 Deg. F
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. (Continued) Text Default Choices Notes MAXHTOA 40° F -20° - 120° F Maximum Heat Outdoor Air Temperature (Only Displayed if Outdoor Sensor is (4° C) (-29° - 49° C) Selected) MINCLRT 3 0 - 20 DDF/HR Minimum Cool Recovery Ramp Rate MAXCLRT 6 0 - 20 DDF/HR Maximum Cool Recovery Ramp Rate (Only Displayed if Outdoor Sensor is Selected) MINCLOA 90° F -20° - 120° F Minimum Cool Outdoor Air Temperature (Only Displayed if Outdoor Sensor
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. T7351 Key Function Summary. Grouping Button Definition Information Down Arrow Lowers setpoint, day, or time. When setting times or temperatures, hold key " down to continuously decrease value. Also can make temporary change in temperature setpoint. Information Obtains information (where humidity high-limit can be set), cycles through setup options. Up Arrow Raises setpoint, day, or time. When setting times or temperatures, hold key ! down t
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Get Factory Schedule (Info/Clear) DEHUMIDIFICATION Performing this operation reverts the schedules to the factory defaults: There are five methods through which the T7351 can 1. Press both Info and Clear Start Time. control for dehumidification. Three of them modify the 2. The display gives the option to revert to FAC SCH. control algorithm, thus providing limited dehumidification a. To restore the factory schedule, press up ! or through cooling. The
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Dehumid Hot Gas BP Options Utilizing Auxiliary Output The auxiliary output operates as shown in Table 6. There are two dehumidification options that utilize the auxiliary output. They are: Table 6. Hot Gas Bypass Dehumidification Logic. Simple Dehumidification. Hot Gas Bypass Dehumidification. Humidity Cooling Stages Active Auxiliary Output High more than one De-energized Simple Dehumid(ification) The auxiliary output: High one or less Energized En
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR 4 AIR COMPRESSOR T7770 REMOTE SENSOR ECONOMIZER SENSOR CONTACTOR 2 DISCHARGE 9 8 7 6 5 4 3 2 1 HEAT HEAT AIR RELAY 3 RELAY 2 SENSOR SUBBASE T5 T6 T7 T4 T3 OS OS AS AS AUX W3/Y4 Y3 W2 Y2 HS W1 HC HP M M X RH RC AUX Y1G COMPRESSOR CONTACTOR 3 3 HUMIDITY HEAT FAN MOTION RELAY 1 RELAY SENSOR SENSOR COMPRESSOR CONTACTOR 1 L2 1 2 L1 (HOT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ENSURE TRANSFORMER IS SIZED TO HAND
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 7. Troubleshooting Information. (Continued) Symptom Possible Cause Action Heat will not No power to the thermostat. Check that X terminal is connected to the system transformer. come on. 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, set
