Honeywell CT3500 Programmable Thermostat User Guide
Table 2. Terminal Designations on Old and New Thermostats
Terminal on Old Thermostat Connect To Description
R, RHa, 4, V
Rc, Ra
R
Power
Rc
W
Power for cooling
Heat
W, W , H
1
Y, Y1, M
G, F
Y
Cooling
G
O
Bb
Fan
O
Changeover in cool. (Single stage heat pump only).
Changeover in heat. (Single stage heat pump only).
Bb
Cc, Xc, Bb
W , H
Do not connect.
Transformer common
Do not continue installation. Second stage heat.
Call 1-800-468-1502.
Second stage cool.
2
2
Y
2
a
b
c
If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.
Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.
Tape off end of the wire with electrical tape and push the taped wire back into the wiring hole in the wall.
WALLPLATE
STEP 5. INSTALL THE BATTERIES
B
IMPORTANT
Three AA alkaline batteries are included with the thermo-
stat. Batteries must be installed for programming and
operation of the thermostat and the heating/cooling sys-
tem.
R
RC
O
W
Y
G
❑ Install the batteries in the wallplate so the positive terminals all
point up (see illustration).
INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.
M10622
9
69-1199—2
| General | Details |
|---|---|
| Name | Honeywell CT3500 Programmable Thermostat User Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.35 MB |
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