Honeywell CT2800 Programmable Thermostat Installation Guide
Six or more wires
If your old thermostat has six or more wires (excluding clock wires attached to the C or C1 terminals), your heating/
cooling system is most likely a variation of a heat pump or multistage system. Your CT2800 Thermostat will NOT work
with such systems and should be returned to the place of purchase. See the thermostat compatibility table for
information about which programmable thermostat will work with your system.
Three thermostat wires
If you have three wires for heating only and can operate the fan using the fan ON switch, the CT2800 Thermostat will
work with your system. Continue the installation procedure.
If you have a three-wire heating-only system and cannot operate the fan using the fan ON switch, the CT2800
Thermostat will probably NOT work with your system. Contact your heating contractor for installation assistance.
Wires that are not connected to old thermostat
If there are extra wires that do not connect to your old thermostat, do not label them. You will not connect these wires
to your new thermostat. Tape off the wires individually with electrical tape and place them where they will not interfere
with the operation of the new thermostat. Continue the installation procedure.
Five wires connected to old thermostat
Your new thermostat has a factory-installed metal jumper between the R and Rc
terminals (Fig. 15). Remove the jumper before wiring the R and Rc terminals.
JUMPER (FACTORY-
INSTALLED). REMOVE
IF 5-WIRE SYSTEM
c
R
R
G
W
Y
M20127
Fig. 15.
Thermostat C Terminal
This thermostat does not use the C wiring terminal.
69-1638—1
10
firealarmresources.com
| General | Details |
|---|---|
| Name | Honeywell CT2800 Programmable Thermostat Installation Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.35 MB |
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