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3 69-1676—1
STEP 1. PREPARE FOR INSTALLATION
❑ Check Table 1, the compatibility chart, to make sure the thermostat is compatible with your system. If your system
is not compatible, call Honeywell Customer Care, toll-free, 1-800-468-1502.
Table 1. Compatibility Chart.
a
Compatible with 2-wire Honeywell zone valves. Not compatible with Taco zone valves and 2- or 3-wire White-
Rodgers zone valves (No. 1311 and 1361).
b
Not compatible with any 120/240 volt system.
Package Contents
• Thermostat • Decorator cover plate • Screws and wall anchors
• Wiring labels • Owner’s Guide
Tools for Installation
• Screwdriver • Drill • Hammer
• Needle nose pliers • Drill bits (3/16 in. drywall,
7/32 in. plaster)
System Type
Compatibility with
CT8775A
Compatibility with
CT8775C
Gas or Oil Warm Air Yes Yes
Electric Warm Air No Yes
Gas or Oil Hot Water
Yes
a
Yes
a
Gas or Oil Steam Yes Yes
Gas or Oil Gravity Yes Yes
Gas Millivolt No No
Electric Air Conditioning No Yes
Baseboard Electric (120/240 line volt)
b
No No
Single Stage Heat Pump No Yes
Multistage Heat Pumps/Multistage Equipment No No