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Step 1: Prepare for Installation
■■ Check Table 1 to make sure this thermostat is compatible with your system. If not, return to the
retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
Table 1. Compatibility Chart.
Not compatible with any 120/240 volt circuit.
a
Compatible with 2-wire Honeywell Zone Valves. Isolating relay required for 3-wire thermostats for
zone valves. Not compatible with 2-wire White-Rodgers no. 1361 Valves.
b
Compatible with
hot water
baseboard systems. Will not work efficiently on steam or gravity
systems.
System Type Compatible With CT3355
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
a, b
Gas—Millivolt
No
Oil-Fired Boilers Yes
a, b
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt)
No
Heat Pumps/Multistage Equipment
No