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Installer Manual 4
Conventional and Heat Pump Systems - Typical Wiring Configurations
3
WIRING
CONVENTIONAL HEAT PUMP
Heat Only 1 Heat/ 2 Heat/ 1 Heat/ 2 Heat/1 Cool
or Millivolt 1 Cool 1 Cool 1 Cool (w/Aux Heat)
Wiring
Terminal
Rh 24 VAC Heating Transformer Rh Rh
1
Rh
1
Rh
6
Rh
6
Rc 24 VAC Cooling Transformer - Rc
1,2
Rc
1,2
- -
(W1) Conventional Heat Relay
(E*) Emergency Heat Relay
2nd Stage Heat/Auxiliary Heat
Y1 Compressor Relay - Y1 Y1 Y1 Y1
G Fan Relay G
3
G G G G
Cool Active Reversing Valve - - - O
8
O
8
Heat Active Reversing Valve - - - B
8
B
8
L
*
System Malfunction Indicator - - - L
9
L
9
C 24 VAC Transformer Common C
4
C
4,5
C
4,5
C
10
C
10
*1230 Only.
NOTES - Conventional Systems
1 Remove factory installed jumper wire for dual transformer systems
2 Only required for dual transformer systems
3 Only connect if needed for system
4 Optional 24 VAC transformer common connection
5 For dual transformer systems, common must come from cooling transformer
Provide disconnect and overload protection as required.
NOTES - Heat Pump Systems
6 Do not remove factory installed jumper wire
7 If no separate emergency heat relay, connect to W2 and Install a field supplied jumper wire from W2 to E
8 Wire O for cool active valve or B for heat active valve (never both)
9 If using optional L terminal, the 24 VAC common must be connected (C terminal)
10
Optional 24 VAC transformer common connection
Provide disconnect and overload protection as required.
Terminal Description
W1
W2*
O
W1
W1
-
E
7
-
-
W2
-
W2
7
W1/E
1030 / 1230 1230 1030 / 1230 1230
B
NOTE: Make sure installer system selection
switch is properly set to CONV or HP.
See Section 2.
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