Wi-Fi 9000 Installation Guide

5 69-2815EFS—03
1H/1C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor
C 24VAC common
O/B Changeover valve [7]
G Fan relay
2H/1C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor
C 24VAC common
O/B Changeover valve [2]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Heat pump system monitor
3H/2C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor (stage 1)
C 24VAC common
O/B Changeover valve [2]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
Y2 Compressor contactor (stage 2)
L Heat pump system monitor
See [notes] below
Y2GY LW2
MCR34828
RKC
O/B
Rc
Y2GY L
Aux/E
MCR34830
RKC
O/B
Rc
Y2GY L
Aux/E
MCR34829
RKC
O/B
Rc
NOTES
Wire specifications:
Use 18- to 22-gauge thermostat wire. Shielded cable is not required.
[1] Power supply. Provide disconnect means and overload protection as required.
[2] In Setup, set changeover valve to O or B.
Wiring
Wiring guide — heat pump systems
Wiring Instructions
1. This thermostat requires a 24Vac common to power the thermostat. The K terminal is available for
Wiresaver module (THP9045A1023).
2. Straighten the wire. Using a pen tip to hold down the terminal, gently slide the wire into terminal hole.
Note: Terminal hole will only accept one wire.
Y2GY LW2
MCR34821
RKC WRc
Jumper Loop