Wi-Fi 9000 Installation Guide

3 69-2815EFS—03
C Common wire from secondary side of cooling transformer (if 2 transformers).
K Optional wirer save module.
Rc Cooling power. Connect to secondary side of cooling system transformer.
R Heating power. Connect to secondary side of heating system transformer.
W-O/B 1st stage heat relay. Or changeover valve for heat pumps.
Y 1st stage compressor contactor.
G Fan relay.
W2-Aux/E 2nd stage heat relay. Or heat pump auxiliary/Emergency heat relay.
Y2 2nd stage compressor contactor.
L Heat pump system monitor.
Y2GY LW2
MCR34825
RKC WRc
Jumper Loop, a plug with a wire loop used to connect the R to the Rc terminals,
Leave jumper loop in place in single transformer systems. Remove (unplug) jumper
loop in two transformer systems.
Terminal Designations
Wiring
MCR34820
C
K
Rc
R
W-
O/B
Y
G
W2-
Aux/E
Y2
L
Remove
jumper loop
ONLY if you
have both
R and Rc
wires.
Terminal
release
Terminal
holes accept
one wire