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Multi-Stage Terminal Outputs
Refer to equipment manufacturers' instructions for specific
system wiring information.
You can configure the thermostat for use with either multi-stage
electric heat systems or multi-stage gas systems. When con-
figured for electric heat, the G terminal (blower/fan) will be
energized on a call for heat.
This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape off
one transformer. If transformer safety circuits are in only one of
the systems, remove the transformer of the system with NO
safety circuits. If required, replace remaining transformer with
a 75VA Class II transformer. After disconnecting one trans-
former, the two commons must be jumpered together.
Use the terminal output information below to help you wire the
thermostat properly for your multi-stage system. After wiring,
see CONFIGURATION section for proper thermostat configu-
ration.
SYSTEM
Multi-stage
L
Malfunction
Light
C _
24 Volt
(Common)
THERMOSTATTERMINALS (MULTI-STAGE)
R W2 E/W1 Y2 Y1 G
24Volt HeatMode Heatmode CoolMode CoolMode Blower/FanEnergized
(Hot) 2ndstage lststage 2ndstage lststage on call for Cool (and
Heat if configured
to Electric Heat)
O B
Energized Energized
in Cool in Heat, Off
Mode Emergency
Modes
The24voltneutralconnectiontoterminalConthethermostatisnotrequiredifyoureplacethebatteriesonceayearwithfresh"AA"Energizer_Ralkalinebattenes.
CHECKTHERMOSTAT OPERATION
To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys.
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to system.
2. Move FAN switch to ON position. The blower should begin
to operate.
3. Move FAN switch to AUTO position. The blower should
stop immediately.
Emergency System
EMER bypasses the Heat Pump to use the heat source wired
to terminal E on the thermostat. EMER is typically used when
compressor operation is not desired, or you prefer back-up
heat only.
1. Press SYSTEM button to select EMER. "EMER" will flash
on the display.
2. Press C) to adjust thermostat setting above room
temperature. The Aux. heating system will begin to
operate. The display will show "STGI" flashing =EMER"
and Flame icon (_) to indicate that the Aux. system is
operating.
3. Adjust temperature setting to 3° above room temperature.
The auxiliary heat system should begin to operate and the
display should show "STGI+2".
4. Press Q to adjust the thermostat below room tempera-
ture. The Aux. heating system should stop operating.
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.
Heating System
1. Press SYSTEM button to select the Flame icon (_). If
the auxiliary heating system has a standing pilot, be sure
to light it.
2. Press (_) to adjust thermostat setting to 1° above room
temperature. The heating system should begin to
operate. The display should show =STGI". However, if the
setpoint temperature display is flashing, the compressor
lockout feature is operating (see Configuration menu,
item 5).
3. Adjust temperature setting to 3° above room temperature.
If your system configuration is set at MS2, HP2 or HP1,
the auxiliary heat system should begin to operate and the
display should show "STGI+2".
4. Press (_ to adjust the thermostat below room tempera-
ture. The heating system should stop operating.
To prevent compressor and/or property damage, if
the outdoor temperature is below 50°F, DO NOT
operate the cooling system.
Cooling System
1. Press SYSTEM button to select the Snowflake icon (,).
2. Press C) to adjust thermostat setting below room
temperature. The blower should come on immediately on
high speed, followed by cold air circulation. The display
should show "STGI".
3. Adjust temperature setting to 3° below room temperature.
The second stage cooling should begin to operate and
the display should show "STGI+2".
4. Press C) to adjust the temperature setting above room
temperature. The cooling system should stop operating.