Install Instructions

iO-DFK
Dual Fuel Kit Wiring Diagram
1 2 3 W Y Y R CO/B 1 2
HP OUTDOOR UNIT
HP THERMOSTAT
FURNACE
D D C R Y Y1 W2 W1 G2
G W1 W2 Y1 Y2 R C O/B
AUX HEAT
W Y Y R CO/B 1 2
HP OUTDOOR UNIT
G W1 W2 Y1 Y2 R C O/B
HP THERMOSTAT
C R Y Y1 W2 W1 G2
FURNACE TERMINALS
LED ON WHEN
FURNACE IS ENERGIZED
DFK-ODT
OUTDOOR
THERMOSTAT
LOCKS OUT HEAT PUMP
IF THE OUTDOOR TEMPERATURE IS
BELOW BALANCE POINT
(FACTORY SET AT 35° F)
JUMPER TERMINALS 2 AND 3
IF DFK-ODT IS NOT USED.
DFK-DAT
DISCHARGE AIR
THERMOSTAT
(OPTIONAL)
NORMALLY SET AT 90° F
TO TEMPER AIR DURING
DEFROST CYCLE
LEAVE JUMPER ACROSS ‘D’ AND ‘D’ TERMINALS
IF DFK-DAT IS NOT USED
SEQUENCE OF OPERATION ON BACK
‘W1’ REPRESENTS
HP THERMOSTAT
AUXILIARY HEAT
NOTE: IF THE HEAT PUMP THERMOSTAT HAS A SEPARATE EMERGENCY HEAT TERMINAL, JUMPER
THE EMERGENCY HEAT TERMINAL AND THE AUXILIARY HEAT TERMINAL AT THE THERMOSTAT.
BLUE
RED
BLACK
RED/BLUE
MAKE ON RISE
(CONTACTS CLOSED
ABOVE BALANCE
POINT SETTING)
FACTORY
JUMPER
‘W2’ NOT USED
FOR 2-STAGE
GAS FURNACE
JUMPER ‘W1’ AND ‘W2’
AT FURNACE BOARD
O
B
LED
REVERSING VALVE
SELECTOR SWITCH