Wiring Conventional Systems - Honeywell Wi-Fi Thermostat 9000 Installation Manual

Wiring
Wiring Guide — Conventional Systems
Wiring Instructions
1. This thermostat requires a 24VAC common wire to power-up. The K terminal is available
for Wiresaver module (THP9045A1023).
2. Straighten the wire. Using a pen's tip, hold down the terminal and gently slide the wire
into the terminal hole.
Note: Terminal hole will only accept one wire.
1H/1C System
(1 transformer)
Rc Power [1]
R
[R+Rc joined by jumper loop]
Y
Compressor contactor
C 24VAC common
W Heat relay
G Fan relay
Heat-only System
Rc Power [1]
R [R+Rc joined by jumper loop]
C 24VAC common
W Heat relay
1H/1C System
(2transformers)
Rc Power (cooling transformer)
R Power (heating transformer)
Y Compressor contactor
C 24VAC common
W
Heat relay
G
Fan relay
Heat-only System
with Fan
Rc Power [1]
R
[R+Rc joined by jumper loop]
C
24VAC common
W Heat relay
G Fan relay
NOTES
Wire specifications: Use 18- to 22-gauge thermostat wire. Shielded cable is not required.
[1] For power supply, provide a means of disconnection and overload protection.
[2] Remove jumper loop for 2-transformer systems.
[3] Common connection must come from cooling transformer.
33-00235
[1, 2]
[1, 2]
[3]
Cool-only System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor
C 24VAC common
G
Fan relay
2H/2C System
(1 transformer)
Rc Power [1]
R [R+Rc joined by jumper loop]
Y
Compressor contactor (stage 1)
C
24VAC common
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
2H/2C System
(2 transformers)
Rc Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor (stage 1)
C 24VAC common
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
See [notes] below
Jumper Loop
4
[1, 2]
[1, 2]
[3]