Multi-Stage Terminal Outputs
Refer to equipment manufacturers' instructions for specific system wiring information.
You can configure the thermostat for use with either
This thermostat is designed to operate a
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
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| THERMOSTAT TERMINALS |
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SYSTEM | L | C | R | W2 | E/W1 | Y2 | Y1 | G | O | B |
Malfunction | 24 Volt | 24 Volt | Heat Mode | Heat mode | Cool Mode | Cool Mode | Blower/Fan Energized | Energized | Energized | |
| Light | (Common) | (Hot) | 2nd stage | 1st stage | 2nd stage | 1st stage | on call for Cool (and | in Cool | in Heat, Off, |
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| Heat if configured | Mode | Emergency |
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| to Electric Heat) |
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CHECK THERMOSTAT OPERATION
NOTE
To prevent static discharge problems, touch side of thermostat to release static
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
1.Press SYSTEM button to select EMER. EMER will flash on the display.
2.Press 
to adjust thermostat setting above room temperature. The Aux. heating system will begin to operate. The display will show STG1 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 STG 1+2.
4.Press 
to adjust the thermostat below room tempera- ture. The Aux. heating system should stop operating.
!CAUTION
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 heat pump system should begin to operate. The display should show STG1. However, if the set point 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 STG 1+2.
4.Press 
to adjust the thermostat below room tempera- ture. The heating system should stop operating.
!CAUTION
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 
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 STG1.
3.Adjust temperature setting to 3° below room temperature. The second stage cooling should begin to operate and the display should show STG 1+2.
4.Press 
to adjust the temperature setting above room temperature. The cooling system should stop operating.
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