Installation Guide
24
18-HD68D1-10
Dual Fuel Applications
Diagram 1 - 1 or 2 Stage Heat Pump w/Variable Speed Gas Furnace (16-pin VSPD Motor)
1 - 1 OR 2 STAGE HEAT PUMP W/VARIABLE SPEED GAS FURNACE (16-PIN VSPD MOTOR)
NOTES:
1. Cut and remove the factory installed BK jumper at
the indoor unit (some units may require DIP switch
settings)
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
R
X2
B
BK
G
INDOOR
UNIT
B
Y/Y1
O
O
Y2
Y1/Ylo
W1
W2
Y/Y2
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.
2- 1 OR 2 STAGE HEAT PUMP w/S9V2 FURNACE (4-PIN VSPD MOTOR)
NOTES:
1. Cut and remove the factory installed BK jumper at
the indoor unit (some units may require DIP switch
settings)
2. Y1 and Y2 wiring from the Relay Panel must connect
to Y1 and Y2 of the indoor unit IFC for proper air flow
and LED read out
1
3
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*
R
R
X2
B
BK
G
INDOOR
UNIT
B
Y/Y1
O
O
Y2
Y1/Ylo
W1
W2
Y/Y2
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.
AC Applications
Diagram 2 - 1 or 2 Stage Heat Pump w/Variable Speed S9V2 Furnace (4-pin VSPD Motor)
