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Whirlpool WHP43 Installation Instructions Manual page 7

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System Composite Diagram—Heat Pumps 10 KW and Below
C
BU W OR
System Composite Diagram—Heat Pumps Above 10 KW
BU
See Note 1
NOTES:
EHR—Emergency Heat Relay (optional)
1. Outdoor thermostat (OT-1) should be the first to close and the
last to open.
2. Connect the white wires and brown wires from the air handler
together if OT-2 is not used.
3. Remove the wire when using the outdoor thermostat.
4. Terminal block markings.
Heat Pump
R
W2 O
Y
Y
Y
R
R
Y
OR
W
BU
#18 Gauge - 5 Wire
Outdoor Thermostat (Optional) Closed on Temperature Fall
#18 Gauge - 6 Wire Needed When Outdoor Thermostat Is Used
Heat Pump
C W2 O
Y
R
W OR
Y
R
R
Y
OR
W
BU
#18 Gauge - 5 Wire
Outdoor Thermostat - 1
Outdoor Thermostat - 2
Outdoor Thermostat (Optional) Closed on Temperature Fall
#18 Gauge - 7 Wire Needed When 2 Outdoor Thermostats Are Used
Conventional
Room Thermostat
W2 G
O
C
R
E
R
BR
G
See
Note 3
W
BU
Conventional
Room Thermostat
W2
Y
O
C
G
R
E
BR
G
See
See
Note 3
Note 2
W
1
2
EHR
3
4
BU
NOTE: For 2-stage units, refer to the Installation Instructions
supplied with the variable-speed indoor units for field wiring
connections.
Symbol
R
BU
BR
OR
#18 Gauge - 7 Wire
Indoor Unit
R
Red
R
G
Green
G
White
W2
W
Blue
C
BU
See
Note 4
#18 Gauge - 7 Wire
Indoor Unit
R
Red
R
R
G
Green
G
White
W2
W
Brown
W3
BR
Blue
C
BU
See
Note 4
Color
Symbol
Red
Y
Blue
G
Brown
W
Orange
Color
Yellow
Green
White
7

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