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Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
WMAHM System Composite Diagram—800 to 2000—10KW and Below
Heat Pump
W2 O
C
Y
BU W OR
Y
BU
#18 Gauge - 5 Wire
Outdoor Thermostat (Optional) Closed on Temperature Fall
#18 Gauge - 6 Wire Needed When Outdoor Thermostat Is Used
WMAHM System Composite Diagram—1200 to 2000—Above 10KW
BU
See Note 1
NOTES:
OT—Outdoor Thermostat (optional)
EHR—Emergency Heat Relay (optional)
1. Outdoor thermostat (OT-1) should be the first to close and the
first to open.
Goodman 6 Long
Conventional
Room Thermostat
W2 G
R
Y
O
C
R
R
Y
OR
W
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
WARNING
HIGH VOLTAGE!
#18 Gauge - 7 Wire
R
E
WMAHM Unit
Red
R
BR
G
Green
See
Note 3
W
White
BU
Blue
Conventional
Room Thermostat
W2
Y
O
C
G
R
E
R
BR
G
See
See
Note 3
Note 2
W
1
2
EHR
3
4
BU
2. If the outdoor thermostat is not used, tie the white and brown
wires from the air handler together.
3. Remove wire when using the outdoor thermostat. #18 gauge
7 wire needed when 2 outdoor thermostats are used.
Color Symbols
R
Red
Y
Yellow
BU
Blue
V
Violet
BR
Brown
OR
Orange
W
White
PK
Pink
G
Green
#18 Gauge - 7 Wire
WMAHM Unit
Red
Green
White
Brown
Blue
9
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