8
INSTALLATION
Installation
Fig. 1 - Typical Connection of a Single Stage or Multi-Stage System*Factory installed jumper between RH and RC
SYSTEM R RH RC C W/E W2YY2G O/B L
Single
Stage
24 VAC
Power
24 VAC
Power for
Heating
24 VAC
Power
for Cooling 24 VAC
Common
Required
Heat N/A Cool N/A FanN/A System
Monitor
Multi
Stage
24 VAC
Power
24 VAC
Power
24 VAC
Power
Heat
mode
1
st
stage
Heat
mode
2
nd
stage
Cool
mode
1
st
stage
Cool
mode
2
nd
stage
CLASS II
Transformer
120 VAC
NEUTRAL
24 VAC
HOT
*
SYSTEM R RH RC C W/E W2YY2G O/B L
Heat
Pump
24 VAC
Power
24 VAC
Power for
Heating
24 VAC
Power
for Cooling 24 VAC
Common
Required
Aux /
Em
1
st
Stage
Aux /
Em
2
nd
Stage
1
st
Stage
Com-
pres-
sor
2
nd
Stage
Com-
pres-
sor
FanChange-
over
Valve
System
Monitor
CLASS II
Transformer
120 VAC
NEUTRAL
24 VAC
HOT