COMMERCIAL PROGRAMMING MODE
Setting the clock
Touch the clock on the display. The day of the week will flash. Use the UP and DOWN arrows to
adjust the day. Touch the clock again. The hour will flash. Use the UP and DOWN arrows to adjust
the hour. If the time is PM, adjust the hour until the PM symbol appears. Touch the clock again. The
minutes will flash. Use the UP and DOWN arrows to adjust the minutes. Touch the clock again and
the thermostat will resume normal operation.
E
E
Heat
Heat Set
PM
Day
E
Mode selection
The T-21-P can control both heating and cooling. Touch the Mode box to cycle through and select
available modes. Based on equipment and thermostat configuration, mode selection can be as
follows:
Off
Heat
Heat
Cool
Cool
Auto
Heat
Cool
E. Heat
- Thermostat will not call for heating or
cooling.
- Thermostat only controls heating.
When heating system is running,
flashes.
- Thermostat only controls cooling.
When cooling system is running,
flashes.
- Thermostat controls both heating and
cooling.
or
will flash when
equipment is running.
- Emergency heat for heat pump
systems should the compressor fail.
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