STEP 4: Check the Thermostat Operation
Installing the Thermostat • 7
3.5. STEP 4: Check the
Thermostat Operation
Once you have installed your new thermostat, you
need to check that the fan, cooling system, and heat-
ing system are all operating properly.
If your system does not have a G terminal connec-
tion, skip to Heating System.
3.5.1. Check the Fan Operation
1. Press the
MENU
button and select
FAN ON
in the
thermostat display. The blower should begin to op-
erate. Place your hand by a vent to confirm blower
is running.
2. Select
FAN AUTO
to return to standard setting.
The blower will now cycle by calling for cool or
heat.
3.5.2. Check the Cooling System
1. Press the
SYSTEM
button one or more times to se-
lect COOL.
2. Press the DOWN arrow button to adjust the thermo-
stat setting 1° below room temperature. The blower
should come on immediately on high speed, fol-
lowed by cold air circulation.
3. If the system is a multi-stage cooling system, adjust
the temperature setting to at least 3° below room
temperature. The second stage cooling should begin
to operate.
4. Press the UP arrow button to adjust the temperature
setting above room temperature. The cooling sys-
tem should stop operating.
3.5.3. Check the Heating System
1. Press the
SYSTEM
button one or more times to se-
lect HEAT mode. If the auxiliary heating system
has a standing pilot, be sure to light it.
2. Press the UP arrow button to adjust the thermostat
setting to 1° above room temperature. The heating
system should begin to operate.
3. If the system is a multi-stage heating system, adjust
the temperature setting to at least 3° above room
temperature. If the system is configured for a multi-
stage furnace (non-heat pump), the second stage of
the heating should begin to operate. Within a very
short period, the Back Up heat should begin to run
Heat Lockout Outdoor
Off
-15 to 120
°
F
Cool Lockout Outdoor
Off
-20 to 95
°
F
Compressor
Optimization
On,
Off
Dehumidification
Off
, OC, OD
Dehum Setpoint
Range: 40% to 80%
Dead Band
Range: 2, 3, 4F
Power-Up delay
Off
10sec to 120sec
Menu Name
Submenu
Press UP or DOWN arrow to
Select Other Options
(Default in Bold)
Comments
Table 3-1
- Installation Menu
CAUTION! To prevent compressor and/or
property damage, if the outdoor temperature is
below 55°F, DO NOT operate the cooling sys-
tem.
NOTE: If compressor lockout is set to ON, the
thermostat will not call for cool until after the
5-minute safety time period and will display the
message A/C return < 5 min. After the 5 min-
utes expire the thermostat will call for cool.
NOTE: If the system is configured as a heat
pump and compressor lockout is set to ON, the
thermostat will not call for heat until after the
5-minute safety time period and will display the
message A/C return < 5 min. After the 5 minutes expire
the thermostat will call for heat.