THERMOSTAT
CONNECT COMMON WIRE
ONLY IF REQUIRED
(REFER TO THE
APPROPRIATE
THERMOSTAT
INSTALLATION
INSTRUCTIONS)
Figure 28. Low Voltage Field Wiring Electric Heat
THERMOSTAT
AIR HANDLER
R
G
W
BK
BU
Air Handler
AIR HANDLER
R
G
BU
S23 OUTDOOR
THERMOSTAT
BK
(IF USED)
K22 EM HEAT
W
RELAY
Heat Pump Application With Electric Heat
Page 19
CONDENSING
UNIT
HEAT PUMP
UNIT