White Rodgers 21D83M-843 Installation, Procedure, B. When replacing original 63K8901 board in

INSTALLATION

TABLE 1

Type	Existing	Replacement
	Control Board	Control Board
	COOL-H	COOL
	HEAT-H	HEAT
	PARK (2)	PARK (2)
L1	EAC-H	EAC
120 VAC	LINE-H	LINE
	XFMR-H	XFMR
	HUM-H	HUM
	NONE	FAN
	LINE-N
Neutral	HUM-N	Neutral
	EAC-N	120 VAC
120 VAC
	XFMR-N	(5)
	CIR-N
Flame Sense	E33	FS

PROCEDURE 2

REPLACING 24L8501, 50A62-120, 50A62-121, 50A62-820, 56L8301, 63K8901 or 97L4801

over the marks. Use the mounting panel as a template to drill 3/16" holes through each of the holes marked "A". Install the replacement control in the freshly drilled holes in the blower access panel.Use aluminum tape to seal the unused holes.

B. When replacing original 63K8901 board in

downflow applications – Look at the existing

control board holes as if the unit were installed

in the upflow position. Make a mark 5/8"

ABOVE each of the existing mounting holes.

Position the provided mounting panel so that

the holes marked "C" in figure 1, page 3 are

over the marks. Use the mounting panel as a

template to drill 3/16" holes through each of

the holes marked "A". Install the replacement

control in the freshly drilled holes in the blower

access panel. Use aluminum tape to seal the

unused holes.

C. All other units – Position the provided

mounting panel so that the arrow on the

front of the panel is pointing up. Position the

replacement 50A66-843 ignition control board

over the holes marked "A" in figure 1, page 3.

Mounting panel

Wiring harness (9-pin to 12-pin)

Optional 4" blue wire to connect to Transformer (TH)

Wiring harness (4-pin to 6-pin)

GND

Transformer

Circuit breaker in series between Pin 3 and Trans- former (TH)

Insert the replacement control stand-off

fasteners into the holes in the mounting panel.

80UHG, 90UGF, G23, G26, GHR26, G32,

GHR32, G40, G41, G50, G51, G60 and G61

units – Insert the four provided stand-off

fasteners into the back of the mounting panel in

the holes marked "B" in figure 1. 80MGF, G24M

and G27M units – Insert the four provided

stand-off fasteners into the back of the mounting

panel into the holes marked "C" in figure 1.

Insert the replacement control board assembly

into the existing holes in the control box or

blower panel.

5. Insert provided circuit breaker in series between

the blue wire on Pin 3 of the wiring harness (9-pin

to 12-pin) and the blue transformer wire. Optional

4" blue wire provided for transformers that have a

quick-connect terminal.

6. Connect the provided 9-pin to 12-pin wiring

Photo 2

1.Disconnect all electrical power and shut off the gas supply to the furnace.

2.Remove the access panel.

3.Disconnect wiring and remove existing ignition control board from the control box.

4.A. When replacing original 63K8901 board

	harness to the unit 9-pin connector.
7.	Connect the provided 4-pin to 6-pin wiring harness
	to the unit 6-pin connector.
8.	Connect the yellow wire from position 6 on the 12-
	pin connector to the yellow transformer wire.
9.	Connect GND wire to equipment ground.
10.	Connect the remaining 120 VAC hot and neutral
	wires and the flame sense wire to the replacement

4

in upflow or horizontal applications or downflow applications – Look at the existing control board holes as if the unit were installed in the upflow position. Make a mark 1" to the

right of each of the existing mounting holes. Position the provided mounting panel so that the holes marked "C" in figure 1, page 3 are

	control per table 2, page 5 .
11.	Affix wiring diagram 5001-6972 adjacent to the
	existing unit wiring diagram
12.	Replace the access panel.
13.	Restore the electrical power and gas supply. Refer
	to the furnace installation instructions for start-up
	and check-out procedures.