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WIRING
Most furnaces are serviced by simply connecting the OEM wiring
directly to the new 50M56U-751 control.
covered below:
HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, HK42FZ011, HK42FZ016
Furnace 2-Pin
Furnace 3-Pin
Furnace 9-Pin
NOTE: Furnaces previously serviced with Carrier 325878-751, ICM 282A, or White-Rodgers 50M56U-751 kits
may have an adapter harness already installed between the factory wiring and the control being replaced. If found,
remove the old adapter harness and replace it with the new one provided in the kit.
The 11-pin inline connections for these applications are reversed or "flipped" 1 for 1 from the standard pinout. To
allow for this, the "Flip" harness connects pin 1 on the control to pin 11 in the furnace, Pin 2 on control to Pin 10 in
the furnace, etc.
1
2
3
4
5
Furnace 11-Pin
6
7
8
9
10
11
NOTE: Using the "Flip" harness when replacing controls other than HK42FZ018 or failure to use the "Flip" harness
when replacing HK42FZ018 will result in a miswiring that will cause a Limit / Rollout Switch Open Error
and eventually a Limit / Rollout Switch Lockout
2
9-Pin Adapter Harness
Used when replacing the following OEM controls:
11-Pin "Flip" Adapter Harness
Used when replacing the following OEM control: HK42FZ018
(Code
Exceptions to this rule are
13).
Control Board
Neutrals
Control Board
2-Pin
Control Board
11-Pin
11
10
9
8
7
Control Board
6
11-Pin
5
4
3
2
1
(Code 33)
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