Honeywell CT3300 Installation And Programming Instructions page 10

Old thermostat terminals that do not match new thermostat terminals
Use the table below to wire the new thermostat.
Connect to New
Old Thermostat
Terminal
R, RH, 4, V R*
Rc, R Rc*
W, W , H W
1
Y, Y , M Y
1
G, F G
O Do not continue
installation
B
C, X, B Do not connect
W , H Do not continue
2 2
installation.
Y
2
*Remove factory-installed jumper between R and Rc terminals in 5-wire systems.
69-1634—1
Thermostat
Terminal
Power
Power for cooling
Heat
Cooling
Fan
Changeover in cool (O terminal) or changeover in heat (B terminal).
You have a single-stage heat pump or zoning system. Select an alternate
thermostat model.
Transformer common.
Second stage heat (W
You have a multistage heating/cooling system. Select an alternate
thermostat model.
Description
, H ) or second stage cooling (Y
2 2
10
).
2