publication

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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
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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 oF (-40 to 80oC)
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:
46
HEATING