10
Check Thermostat Operation
If at any time during testing your system does not operate
properly, contact a qualifi ed service person.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to system.
2. Press FAN key to ON position. The blower should begin
to operate.
3. Press FAN key to AUTO position. The blower should
stop immediately.
Heating/Humidifi er
1. Press SYSTEM key to select HEAT. If the auxiliary heating
system has a standing pilot, be sure to light it.
2. Press
to adjust thermostat setting to 1°
above the room
temperature. The heat pump system should begin to operate.
The display should show "System On". However, if the system
confi guration is set to HP1 or HP2 and setpoint temperature
display is fl ashing, the 5 minute compressor lockout feature
is operating (see Confi guration menu, item 11).
3. Adjust temperature setting to 3° above room temperature.
If your system configuration is set at MS2, HP1 or HP2, the
auxiliary heat system should begin to operate and the display
will show "System On +2".
4. Press
to adjust the thermostat below room temperature.
The heating system should stop operating.
To check the humidifi er when System On appears and the
heating system is running press the *HUMIDITY button once.
Press
to adjust the humidity 2% or more above the room
humidity level. Hum On will appear indicating it is calling for
the humidifi er.
*Note: If Auto Schedule is displayed instead of Humidity, Auto
Schedule must be turned off in the Confi guration Menu.
Emergency Mode
Applies only to Heat Pump Systems
Emergency Heat (System EM Position) bypasses the Heat
Pump to use the heat source wired to terminal W/E, W2 on
the thermostat. EM is typically used when compressor opera-
tion is not desired, or you prefer back-up heat only.
1. Press SYSTEM key to select EM. “EM Heat Mode” will
fl ash on the display.
2. Press
to adjust thermostat setting above room tem-
perature. The Emergency heating system will begin to
operate. The display will show “System On” fl ashing “EM
Heat Mode” and “Heat” to indicate that the Emergency sys-
tem is operating.
OPERATING YOUR THERMOSTAT
3. Adjust temperature setting to 3° above room temperature. Any
additional stages of auxiliary heat should begin to operate
and the display will show "System On +2".
4. Press
to adjust the thermostat below room temperature.
The heating system should stop operating.
Cooling/Dehumidifi er
1. Press SYSTEM to select COOL.
2. Press
to adjust the thermostat setting below room tem-
perature. The blower should come on immediately on high
speed, followed by cold air circulation. The display should
show "System On". If the setpoint temperature display is
fl ashing, the compressor lockout feature is operating (see
Confi guration menu, item 5).
3. Adjust temperature setting to 3° below room temperature.
The second stage cooling should begin to operate and the
display should show "System On +2".
4. Press
to adjust the temperature setting above room
temperature. The cooling system should stop operating.
To check the dehumidifi er when "System On" appears and
the cooling system is running press *HUMIDITY button once.
Press
to adjust the humidity 2% or more below the room
humidity level. "DeHum On" will appear indicating it is calling
for the dehumidifi cation.
If the room humidity is lower than the adjustment range, press
to 40% and hold it for four seconds. This will force the "DeHum
On" for one complete cooling cycle to test the dehumidifi cation
equipment.
After adjusting the humidity setting the display will return to
temperature in approximately 10 seconds. To switch the display
back to temperature immediately after adjusting humidity setting
press HUMIDITY again.
*Note: If Auto Schedule is displayed instead of Humidity, Auto
Schedule must be turned off in the Confi guration Menu.
Choose the Fan Setting (Auto or On or Prog)
There are three fan features on the (-)HC-TST412MDMS:
1. Fan Auto/On – Traditional Fan Settings
Press Fan to select Auto or On. The most commonly
used setting is Auto. Fan Auto runs the fan only when
the heating or cooling system is operating. Selecting Fan
On runs the fan continuously for increased air circulation
or to allow additional air cleaning if the system is equipped
with an Electronic Air Cleaner.
2. FAN Prog – Comfort Circulating Fan Feature
Pressing FAN until FAN Prog appears activates the Com-
fort Circulating Fan Option. This causes the thermostat to
cycle the fan on for 10 minutes and off for 20 minutes if the
thermostat has not called for heat or cool during the past
60 minutes. This assures moderate air circulation even
when the heating and cooling equipment is not cycling.
To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys.
NOTE
Do not allow the compressor to run unless the com-
pressor oil heaters have been operational for 6 hours
and the system has not been operational for at least
5 minutes.
CAUTION
!
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
CAUTION
!
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