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Model

Number Pre-Purge

Ignitor

Warm-Up Retries

Heat

Delay to

Fan ON

Heat Delay

to Fan OFF

Cool

Delay to

Fan ON

Cool

Delay to

Fan OFF

Automatic

Reset

Time

21V51U-843

15

17

2

45 90/120/150/180 5

60 60 minutes

?

PAGES

181–182

21V51U-843

Includes:

• Module

• HotRod

Ignitor Kit

• Wiring Harness

21V51U-843 UNIVERSAL INTEGRATED

HSI FURNACE CONTROL KIT

Replaces White-Rodgers 50V51-XXX's and 50V61-XXX's

Two-Stage HSI Systems with 80V or 120V Ignitors

FEATURES

• 16-pin variable speed circulator output for ECM (Electronically Commutated Motor),

dipswitch selectable for OEM applications two-speed inducer output, two-stage gas

valve output.

• Pushbutton fault history retrieval.

• Furnace status LED – tri-color (green, red and amber).

• Heat fan off delay (dipswitch selectable), fan on delay for cooling.

• Auto second stage delay (dipswitch selectable).

• 120 VAC humidifier output/120 VAC electronic air cleaner output.

SPECIFICATIONS

Electrical Rating:

Input Voltage . . . . . . . . . . 24 VAC, 60 Hz (Class II transformer required)

Nom. Input Current @ 24 VAC . . . 595 mA + MV

Relay Load Ratings:

Gas Valve Relays . . . . . . . . 1.5 amps @ 24 VAC, 60 Hz

Inducer Relays . . . . . . . . . . . . . . . . . . 2.2 FLA – 3.5 LRA @ 120 VAC

Humidifier Load . . . . . . . . . 1.0 amp max. @ 120 VAC

Electronic Air Cleaner Load . . . . 1.0 amp max. @ 120 VAC

Ignitor Relay . . . . . . . . . . 4.0 amps max. @ 132 VAC, 60 Hz

Flame Current Requirements:

Minimum current to insure flame detection

0.3 µa DC*

Maximum current for non-detection . 0.1 µa DC*

Maximum allowable leakage resistance 100 M ohms

*Measured with a DC microameter in the flame probe lead

Operating Temperature Range . . . -40

o

to 175

o

F (-40 to 80

o

C)

Humidity Range . . . . . . . . . 5% to 93% relative humidity (non-condensing)

Flame Failure Response Time . . . . . . 2.0 sec. max. @ 60Hz

TECHNICAL HELP

Wiring Diagram/Operation . . . . . . . See pages 181–182

UNIVERSAL

REPLACEMENT

TWO-STAGE INTEGRATED

VARIABLE SPEED (ECM)

HSI FURNACE CONTROL

CROSS REFERENCE

18M9901

21V51U-843

20300002

21V51U-843

20300004

21V51U-843

20300006

21V51U-843

20300006S 21V51U-843

21V51U-843 21V51U-843

49M5901

21V51U-843

50V51-243

21V51U-843

50V51-288

21V51U-843

50V51-289

21V51U-843

50V51-290

21V51U-843

50V51-507

21V51U-843

50V61-120

21V51U-843

50V61-143

21V51U-843

50V61-288

21V51U-843

50V61-289

21V51U-843

50V61-480

21V51U-843

50V61-486

21V51U-843

50V61-507

21V51U-843

B1809925

21V51U-843

B1809927

21V51U-843

B1809927S 21V51U-843

CNT 04018

21V51U-843

CNT 04352

21V51U-843

CNT03078

21V51U-843

D156245P01 21V51U-843

D34142P01

21V51U-843

PCB00106

21V51U-843

PCB00106S 21V51U-843

PCBBF106

21V51U-843

PCBBF106S 21V51U-843

PCBBF107S 21V51U-843

X13650840010 21V51U-843

21V51U-843 Replaces:

www.white-rodgers.com

46

HEATING