Prepare For Installation
■■ Check Table 1 to make sure this thermostat is compatible with your system. If not, return to
retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
TABLE 1—COMPATIBILITY CHART.
System Type Compatible With CT2800
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
1
Gas—Millivolt No
Oil-Fired Boilers Yes
1
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermo-
stats for zone valves. Not compatible with 2-wire White-Rodgers no.1361 valves.
Compatible with
hot water
baseboard systems. Will not work efficiently on steam or
gravity systems.
STEP 1
2
2
1
2
2
■■ Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we
recommend Energizer batteries.
3
CROSS-RECESSED
SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
MASKING TAPE, IF
NEEDED TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE
M878A
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