Specifications

3
INSTALLATION
Replacing HK42FZ004, HK42FZ007,
HK42FZ008, HK42FZ009, HK42FZ011,
and HK42FZ016
Use Old Style Wiring Harness Adaptor. Reference Fig. 2,
Table 1 and Wiring Diagram.
1. With power removed, connect the old style wiring adapter
(Reference Fig. 2) 9-pin connector, Inducer connector,
and Ignitor connector to the appropriate connectors in the
furnace.
2. Connect the 24 VAC and 24 VAC common wires per
Table 1.
3. Connect the 12-pin, 4-pin and Flame Sense (FS)
connectors to the new control
4. Connect the remaining wires to the replacement control
per Table 1.
Figure 2 – Old Style Wiring Harness Adapter
Replacing HK42FZ013, HK42FZ034
Use New Style Wiring Harness Adaptor. Reference Fig 3,
Table 1 and Wiring Diagram.
1. With power removed, connect the New style wiring
adapter (Reference Fig. 3) 11-pin In-line connector,
Inducer connector and Ignitor connector to the appropriate
connectors in the furnace.
2. Connect the 24 VAC and 24 VAC common wires per Table 1.
3. Connect the 12-pin, 4-pin and Flame Sense (FS)
connectors to the new control.
4. Connect the remaining wires to the replacement control
per Table 1.
Ne
w Board
12-Pin
Connector
24 VAC (-) of
Furnace Wiring
24 VAC (+) of
furnace wiring
9-Pin Connector
of furnace wiring
2-Pin Inducer and
Ignitor Connector
Humidification
(24V)
Ne
w Board
Flame Sense
(FS)
Ne
w Board
4-Pin Connector
Blo
wer Motor
Neutral Adapter
Figure 3 – New Style Wiring Harness Adapter
INSTALLER MUST READ FOR PROPER
INSTALLATION
• Before removing existing control board, tag wires to assure
proper connection to new board.
• Wiring harness adaptors are included in this kit. Wiring
harness adaptors will be used when replacing existing
control as indicated below. The remaining harnesses can
be discarded.
• IMPORTANT: For low speed continuous fan speed
operation, one of the unused parked motor taps must be
connected to the low heat speed terminal. Failure to do this
will result in the blower not energizing in the constant fan
mode operation. Refer to figure 1.
For low speed continuous fan speed
connect one of the unused parked
terminals here
Figure 1
TABLE 1
Type ExistingControl New Control
24V Thermostat
Terminals
G G
R R
Y Y
W W
Com 24V C
Humidification (24V)
Thermostat or 1/4” Spade
HUM See Harness Adaptor
Humidification (120V) N/A HUM-H
Transformer 24 VAC (+) SEC-1 TH (In 12-pin connector)
Transformer 24 VAC (-) SEC-2 TR (In 12-pin connector)
Twin Test/Twin N/A
Self Test
Test/Twin to
Com 24V
Selection Button (Fault)
Blower Speed
Selection (120V)
Cool Cool-H
Heat HI-Heat
Spare-1 Park
Spare-2 Park
Low Speed Continuous
Fan (120V)
N/A LO-Heat
Blower Neutral COM/BLW
Line Neutral
(use L adapter wire)
Power (120V) L1 LINE-H
Power Neutral L2/Neutral Line Neutral
Transformer (120V) PR-1 XFMR-H
Transformer Neutral PR2/Neutral Line Neutral
Electronic Air Cleaner
(120V)
EAC-1 EAC-H
Electronic Air Cleaner
Neutral
EAC-2 Line Neutral
Flame Sensor Probe
from 9-Pin
Connector
FS
Ne
w Board
Flame Sense
(FS)
24V (+) of
Furnace Wiring
24 VAC (-) of
Furnace Wiring
9-Pin Connector
of Furnace Wiring
Inducer Connector
of Furnace Wiring
Ignitor Connector
of Furnace Wiring
Ne
w Board
12-Pin Connector
Ne
w Board
4-Pin Connector
Blower Motor
Neutral Adapter
Humidification
(24V)