Installation Guide
18
18-HD68D1-10
6- 1 STAGE HEAT PUMP W/GAF2-36M MODEL AIR HANDLER
NOTES:
1. YI and YO connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
2. Wire 3rd party condensate overflow switches
beteeen Y1 of the Relay Panel and YI of the air
handler
3. Connection to X2 is not required for this
configuration
3
2
1
1
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONL
Y
24V
ONL
Y
24V
ONL
Y
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
O
R
B
YI
YO
W
G
INDOOR UNIT
R
X2
B
O
Y
OUTDOOR UNIT
COMMUNICATING
CONTROL
D
R
B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
3- 1 STAGE HEAT PUMP W/GAM5B MODEL AIR HANDLER
NOTES:
1. Y terminal must be connected at indoor unit for
selected compressor air flow
2. Connection to X2 is not required for this
configuration
2
1
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONL
Y
24V
ONL
Y
24V
ONL
Y
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
Y
W1
W2
W3
G
INDOOR UNIT
R
X2
B
O
Y
OUTDOOR UNIT
COMMUNICATING
CONTROL
D
R
B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 4 - 1 Stage Heat Pump w/GAM5B Model Air Handler
Diagram 3 - 1 Stage Heat Pump w/GAM5 or TAM4 Model Air Handler
