Pro1 T621-2 Operation manual - Manual (Page 3)

THERMOSTAT OPERATION
3
Caution:
When the battery icon
appears replace your AA
batteries immediately. Failure
to do so may result in your
heating & cooling system
becoming inoperable.
Easy to use controls
LCD Display:
See page 2 for details about this
display read out. 1
2
3
4 Temperature Setpoint Buttons:
Press the or buttons to
select the desired room temperature.
Fan Switch:
Select
ON or AUTO. ON will run
the fan continuously. AUTO will cycle
the fan on only when the heating or
cooling system is on.
System Switch:
Selects the operation mode of your
HVAC system. Selecting
HEAT turns
on the heat mode. Selecting COOL
turns on the air conditioning mode.
Selecting
OFF turns both heating
and cooling off. Selecting EmH locks
out your compressor and turns on
the secondary heat mode.
1
2 3
4
Understanding Thermostat Staging
Your thermostat will control two stages
of heating. The thermostat will try to
maintain your comfort setting using the
first stage for energy efficiency. The
second stage of heating will only be
used if your thermostat cannot maintain
your comfort setting using only one
stage. When the second stage is used
you will see
+1 in the display.