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Features
• Four pre-programmed Energy Star setpoints for each day of the week.
• Two “AA” ENERGIZER brand batteries retain program memory, even
during power outages.
• Low battery indicator.
• Fahrenheit/Celsius display option.
• Programmable from 45°F (7°C) to 90°F (32°C).
• Accuracy within ± 1 degree.
• Adjustable temperature differential: 1-3 degrees.
• Maintains summer and winter programming.
• Low temperature freeze protection. While in heat mode, thermostat
will mechanically turn on heat if temperature drops to 40°F (4°C) -
even if batteries are missing or drained.
• Automatic heating shutdown if temperature exceeds 90°F (32°C).
• Quickset programming for quickly programming all days
of the week simultaneously.
• Mercury free, environmentally friendly.
Replacing Existing Thermostat
1. Turn off power to heating and cooling system.
2. Remove cover of old thermostat to expose wires. Do not
disconnect wires. (Fig. 1)
3. Label wires per Table 1.
Table 1
Old Label New Label Description
M, 4, RH, R5 or R RH Heat Transformer,
hot side
V or RC RC Cooling Transformer, hot side
Y or Y6 Y Cooling Control
H, W or 4 W Heating control
F or G G Fan control relay
C* Y or None Either cooling control or com-
mon side of transformer
O O Cool active reversing valve
B B Heat active reversing valve
*NOTE: ON SOME OLDER MODELS, THE C TERMINAL CAN BE EITHER THE COOLING CONTROL OR THE
COMMON SIDE OF THE TRANSFORMER
. CHECK FURNACE WIRING DIAGRAM TO VERIFY C TERMINAL. IFITIS
THE COMMON SIDE OF THE TRANSFORMER
, CAP THE WIRE AND TUCK INTO THE WALL. IF IT IS THE COOLING
CONTROL
, CONNECT TO THE Y TERMINAL.
4.After labeling wires, remove wires from terminals.
5. Remove existing thermostat base from wall.
6. Refer to the following section for instructions on how to
install thermostat.
2