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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT
3 62-0258
Fig. 4. Mounting thermostat on subbase.
Wiring
Follow equipment manufacturer wiring instructions when
available. Refer to the Wiring Diagram section for typical
hookups. A letter code is located near each terminal for
identification.
IMPORTANT
All wiring must comply with local electrical codes
and ordinances.
NOTE: Maximum (and recommended) wire size is 18-
gauge. Do not use wire smaller than 22-gauge.
1. Loosen subbase terminal screws and connect sys-
tem wires.
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole in the wall.
4. Plug the hole with nonflammable insulation to pre-
vent drafts from affecting the thermostat.
SETTINGS
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 Occupied Heat and Cool
setpoints, simply press the Heat and Cool button under
the Occupied or Not Occupied area of the keypad. To set
the Standby Heat setpoint, press both the Occupied and
Not Occupied Heat buttons simultaneous. To set the
Standby Cool setpoint, press the Occupied Cool and Not
Occupied Heat buttons simultaneously.
Setting System and Fan
System default setting is Auto. Fan default setting is On.
NOTE: Use System and Fan keys to change settings.
System Settings
— Auto: Thermostat automatically changes between
heating and cooling based on indoor temperature.
— Cool: Thermostat controls cooling.
— Off: Heating, cooling, and fan are all off.
— Heat: Thermostat controls heating.
— Em Heat: Auxiliary heat serves as first stage.
Compressor stages are locked off.
Fan Settings
— On: See Table 1.
— Auto: Fan always cycles with call for heat or cool.
— Conventional: The equipment (i.e. plenum switch)
controls fan operation in heat mode. Thermostat
controls fan operation in cool mode.
— Electric Heat: Thermostat controls fan operation in
both heat and cool modes.
NOTES: Fan operation can extend (delay Off) after the
heating/cooling turns off:
— Heating choices are 0 or 90 seconds.
— Cooling choices are 0 or 40 seconds.
Table 1. Fan On Control Logic.
M19609
B.
PRESS LOWER EDGE OF CASE TO LATCH.
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.
Occupancy Call for Heat/Cool
Scheduled Sensor Signal Yes No
Occupied Occupied On On
Occupied Standby On
Off
a
a
In heat mode, when set for conventional heat, the equip-
ment (i.e. plenum switch) could power the fan despite
the T7351.
Standby — On On
Not Occupied — On
Off
a