Features
• Four pre-programmed Energy Star setpoints for each day of the week
• Quickset™ programming for quickly programming all days of the
week simultaneously
• Energy Efficient Recovery (EER™)
• Residual cooling for added air-conditioning efficiency
• Two “AA” ENERGIZER brand batteries retain program memory, even
during power outages
• Low battery indicator
• LED indicator for auxiliary system operation
• Zone compatible as master thermostat
• Fahrenheit/Celsius display option
• Programmable from 45°F (7°C) to 90°F (32°C)
• Accuracy within ±1 degrees
• Adjustable 1st and 2nd stage differential: 1-3 degrees,
1st stage: 2-6 degrees, 2nd stage
• Maintains summer and winter programming
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
R, V-VR or VR-R R 24 VAC
Y, Y1 or M Y1 1st Stage Cooling Circuit
O or R O Reversing Valve (Cooling Mode)
B B Reversing Valve (Heating Mode)
G or F G Fan Contactor Circuit
Y2 Y2 2nd Stage Cooling Circuit
W2 or W-U W2 2nd Stage Heating Circuit
W1 W1 1st Stage Heating Circuit
C, X or B C 24 VAC, Transformer Common Side
NOTE: THIS THERMOSTAT REQUIRES A 24V AC COMMON WIRE FOR PROPER OPERATION.
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
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