MOUNTING AND WIRING
!WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.
Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.
Electric/Gas Switch (Fan Option)
The ELEC/GAS switch is factory set to the ELEC position. In this position, the thermostat will power the circulator fan on a call for heat. Electric heat systems require the switch to be in the ELEC position.
If your system does not require that the thermostat power the circulator fan, this switch should be set to the GAS position. Typically, gas and oil heating systems do not require the thermostat to power the circulator fan during a call for heat. If your heat is gas or oil, the switch should be set to the GAS position.
When the thermostat is configured for Heat Pump, the thermo- stat will always power the circulator fan on a call for heat in the HEAT mode. The ELEC/GAS switch must be set to match the type of Auxiliary heat your system uses for proper operation in the EMERgency mode.
All wiring diagrams are for typical systems only. Refer to equipment manufacturers' instructions for specific system wir- ing information.
!CAUTION
Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.
Attach Thermostat Base to Wall
1.Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit.
2.Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 4).
3.Place base over hole in wall and mark mounting hole locations on wall using base as a template.
4.Move base out of the way. Drill mounting holes.
5.Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. Place a level against bottom of base, adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure subbase.
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.
Battery Location
2 "AA" alkaline batteries are included in the thermostat at the factory with a battery tag to prevent power drainage. You must remove the battery tag to engage the batteries.
If BATT is displayed, the batteries are low and should be replaced with fresh "AA" Energizer® alkaline batteries. To replace batteries, set system to OFF, install the batteries along the top of the base (see Fig. 1). The batteries must be installed with the positive (+) end to the left.
O
Reversing Valve
Energized in Cool
Mode
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| E/W1 |
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| THERMOSTAT | ||||
B | Y2 |
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Y1 |
| G |
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| C |
| L | R | ||||||||||||
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| SYSTEM |
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| SYSTEM | |||
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Reversing Valve |
| 2nd Stage |
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| Fan |
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| MONITOR |
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Energized in Heat, |
| Compressor |
| Compressor |
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| Aux |
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| SWITCH |
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| Relay |
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Off, Emergency |
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| Relay |
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| Contactor |
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Mode |
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| Relay |
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| 24 VAC |
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| Hot | ||||||
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| 120 VAC | ||||
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| Neutral |
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| TRANSFORMER | ||||
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| (Class II Current Limited) | |||||||
Figure 2. Typical wiring diagram for single transformer heat pump systems
NOTE
If safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits.
CUT AND
TAPE OFF!
HOT
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| 24 VAC |
120 VAC |
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NEUTRAL
O | B | Y2 | Y1 |
| G | ||||
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Reversing | Reversing | 2nd Stage |
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| Fan | ||||
Valve |
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Valve | Compressor |
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Energized in |
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Energized in | Heat, Off, |
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Cool Mode |
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| Compressor |
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Emergency |
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| Contactor |
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| Mode |
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E/W1
W2
Emergency or 1st Aux.
Aux Stage
Relay Relay (Stage 2)
CL
SYSTEM
MONITOR
SWITCH
THERMOSTAT
R
SYSTEM
Limit or
Safety
Switches
24 VAC |
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| Hot |
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| 120 VAC | |
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| Neutral |
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TWO COMMONS MUST
BE JUMPERED TOGETHER!
TRANSFORMER
(Class II Current Limited)
2