INSTALLATION
!WARNING
Thermostat installation and all components of the control system shall conform to Class II circuits per the NEC code.
Remove Old Thermostat
Before removing wires from old thermostat, mark wires for terminal identification so the proper connections will be made to the new thermostat.
Installing New Thermostat
1.Pull the thermostat body off the thermostat base. Forcing or prying on the thermostat will cause damage to the unit.
2.Place base over hole in wall and mark mounting hole locations on wall using base as a template.
3.Move base out of the way. Drill mounting holes. If you are using existing mounting holes and the holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure the base.
4.Fasten base snugly to wall using mounting holes shown in Figure 1 and two mounting screws. Leveling is for appearance only and will not affect thermostat operation.
5.Connect wires to terminal block on base using appropriate wiring schematic.
6.Push excess wire into wall and plug hole with a fire
resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
8. Install 2 "AA" alkaline batteries.
7.Carefully line the thermostat up with the base and snap into place.
Battery Location
2 "AA" alkaline batteries are included with the thermostat. Install the batteries before snapping the thermostat on the base. Install the batteries in the rear along the top of the thermostat (see Fig. 1).
To replace batteries, set system to OFF and remove thermostat from wall. For best results, use a premium brand "AA" alkaline battery such as Duracell® or Energizer®. If the home is going to be unoccupied for an extended period (over
3 months) and 
is displayed, the batteries should be replaced before leaving.
WIRING CONNECTIONS
Power Stealing Switch
The Power Stealing Switches (Fig. 1) should be left in the "On" position for most systems.
Power Stealing Assist is very reliable to increase battery life, drawing a small amount of power from the HVAC system. But on a small number of heating or cooling systems with high impedance electronic modules you may observe one of the following conditions to indicate that Power Stealing Assist is incompatible:
1.The furnace draft inducer motor may run with no call for heat.
2.The furnace fan may turn on with no call for heat or may not turn off.
3.The furnace may not turn off when the call for heat ends.
4.The air conditioner may not turn off when the call for cool
ends.
If the Power Stealing Assist method is not compatible with your system, place the Power Stealing Switches to "Off". This cancels Power Stealing Assist, operates the thermostat on batteries and corrects the condition.
Figure 1 – Thermostat Base
Mounting | Mounting |
Hole | Hole |
Place Level | Place Level |
across Mounting Tabs | across Mounting Tabs |
(for appearance only) | (for appearance only) |
Rear view of thermostat
2 "AA" Batteries
Power Stealing
Switches
* 
* A1 For Damper Control Not Applicable To This Model.
Refer to equipment manufacturers' instructions for specific system wiring information. After wiring, see CONFIGURA- TION section for proper thermostat configuration.
Wiring diagrams shown are for typical systems and describe the thermostat terminal functions.
Terminal | Single Stage | Multi Stage |
| Heat Pump 1 | Heat Pump 2 |
Designation |
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O/B | Changeover Terminal Energized in Heat (B) or Cool (O) for Heat Pump or Damper Systems | ||||
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Y2 | No Output | 2nd Stage Compressor |
| No Output | 2nd Stage Compressor |
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Y | Cool Mode | Cool Mode 1st Stage - |
| Heat and Cool Mode 1st Stage - | Heat and Cool Mode 1st Stage - |
| Compressor Relay | Compressor |
| Compressor | Compressor |
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G |
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| Fan Relay |
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RC |
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| Power for Cooling |
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RH |
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| Power for Heating |
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C | "Common wire from secondary side of cooling (Optional). Required for fault indication, continuous backlight | ||||
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| operation or remote temperature sensor operation" |
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6 | Powered closed 3rd wire for | No Output |
| No Output | No Output |
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W/E | Heat Mode | Heat Mode 1st Stage |
| Heat Mode 2nd Stage, | Heat Mode 3rd Stage, |
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| Emergency Mode 1st Stage | Emergency Mode 1st Stage |
W2 | No Output | Heat Mode 2nd Stage |
| Heat Mode 3rd Stage, | Heat Mode 4th Stage, |
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| Emergency Mode 2nd Stage | Emergency Mode 2nd stage |
L |
| System Diagnostic Terminal - Displays Call for Service |
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