White Rodgers 21V51U-843 Specification

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Universal Two-Stage
HSI Integrated Variable-Speed (ECM)
Circulator Furnace Control Kit

21V51U-843

Replaces:

All White-Rodgers 50V51-XXX’s
and 50V61-XXX’s Two-Stage HSI
Systems with 80V or 120V Ignitor

INCLUDED

HotRod™ Universal
Ignitor Kit – 21D64-2

Replace
the Original
with the Original.

21V51U-843 simplifies stocking,
installation and ensures peak
system performance.

Easy-Install Kit includes everything you need
for quick and accurate replacement:

–

• Ignition Control Module

• Wiring Harnesses for Amana/Goodman

™

• HotRod

• Installation Instructions and OEM Cross-Reference

Universal Ignitor Kit – 21D64-2

50V51-843

Universal Integrated Furnace Module 50V51-843

Universal Two-Stage HSI Integrated Variable-Speed
(ECM) Circulator Furnace Control Kit

Replaces:

All White-Rodgers 50V51-XXX’s and 50V61-XXX’s Two-Stage HSI Systems with 80V or 120V Ignitor

21V51U-843

Features

• 120 VAC Ignitor Output

• 120 VAC Two-Speed Inducer Output

• 120 VAC Humidifier Output

• 120 VAC Electronic Air Cleaner Output

• 2-Stage Gas Valve Output

• 16-Pin Variable Speed Circulator Output

• OEM Application – Dipswitch Selectable

• Fuse Protection – 3 Amp

• Furnace Status LED – Tri-Color
(Green, Red and Amber)

• CFM LED – (Green)

• Heat Fan OFF Delay (Dipswitch Selectable)

• Fan ON Delay for Cooling

• Auto Second Stage Delay
(Dipswitch Selectable Mode)

• Historical Fault Retrieval by Pushbutton

• YLO, Y, W, W2, R, G, C, O, BK/DS/
Dehum Terminals

• Pressure Switch Inputs and Monitoring

• Flash Microprocessor with
Non-Volatile Memory

• Flame Current Measurement Points

Specifications

Electrical Ratings [@ 77°F (25°C)]

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, 60 Hz
Humidifier Load: 1.0 amp max. @ 120 VAC, 60 Hz
Electronic Air Cleaner Load: 1.0 amp max. @ 120 VAC, 60 Hz
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 microammeter in the flame probe lead

Operating Temperature Range

-40° to 175°F (-40° to 80°C)

Humidity Range

5% to 93% relative humidity (non-condensing)

Timing Specifications (@ 60 Hz)

Flame Failure Response Time: 2.0 sec. max.

Gases Approved: Natural, Manufactured, Mixed, Liquefied
Petroleum and LP Gas/Air Mixtures are all approved for use.

Dimensions

5.25" W x 8" H x 1.25" D

For Additional Information

Visit www.white-rodgers.com

Timing Specifications

(All times are in seconds unless noted otherwise)

21V51U-843

Pre-purge 15
Ignitor warm-up 17
Trial for ignition period 4
Ignition activation period 3
Retries 2 times
Valve sequence period 12
Interpurge 60
Post-purge 15
Lockout time 300
Heat delay to fan ON 45
Heat delay to fan OFF* 90/120/150/180
Cool delay to fan ON 5
Cool delay to fan OFF 60
Delay to fan ON 0
Auto reset 60 minutes
Electronic air cleaner Yes
Humidifier Yes

* These times will vary depending on option
switch position. See OPERATION section for
further information.

21V51U-843 Cross Reference Application Data:

Module Model # Furnace Model Harness Ignitor Furnace OEM

18M9901 G60DFV (X) or None 21D64-2* Lennox
G60UHV required

20300002 N/A Amana
20300004 N/A Goodman
20300006 Same as 50V61-289
49M5901 G60UHV or G61MPV Lennox
50V51-243 FC8V, FC9V, FL8V, FL9V, GM8V, Use existing Coleman

GM9V, LC8V, LL8V, LM8V, or 21D64-2 Evcon/Luxaire
PV8A, PV9A or PV9B York

50V51-288 N/A A,B Amana
50V51-289 N/A Goodman
50V51-290 N/A
50V51-507 XV80 or XV80i None 21D64-2* American

required required Standard/
Trane

50V61-120 G60DFV (X), G60UHV Lennox
or G61MPV

50V61-143 CDX1-75N, CDX1-100N, Thermo Pride
CDX1-125N, CHX1-75N,
CHX1-100N or CHX1-125N

50V61-288 N/A Amana
50V61-289 AMV91155DXA Goodman
50V61-289 AMV81155CXA
50V61-289 ADV80703BXA
50V61-289 ADV80905CXA
50V61-289 AMV90453BXA

Note: The installer may have to modify existing ignitor hole to accommodate the new 21D64-2, with ceramic diameter (0.394").

*21D64-2 Ignitor Note: In these applications, the existing 80V ignitor must be replaced by the 120V 21D64-2 ignitor.

Module Model # Furnace Model Harness Ignitor Furnace OEM

50V61-289 AMV90704CXA None 21D64-2* Amana
required Goodman

50V61-289 AMV90905DXA
50V61-289 AMV80703BXA
50V61-289 AMV80905CXA
50V61-289 AMV80704BXA
50V61-289 ADV81155CXA
50V61-289 AMV90704CXA
50V61-507 XV80 or XV80i American Standard

Trane
B1809925 N/A A,B Use existing Amana/

or 21D64-2 Goodman
B1809927 N/A
B1809927S N/A
CNT03078 XV80 or XV80i None 21D64-2* American Standard

required Trane
D156245P01 XV80 or XV80i

D34142P01 XV80 or XV80i
PCB00106 N/A A,B Use existing Amana

or 21D64-2 Goodman
PCB00106S N/A

PCBBF106 N/A
PCBBF106S N/A
PCBBF107S N/A
X13650840010 XV80 or XV80i None 21D64-2* American Standard

required Trane

Saint Louis, Missouri Markham, Ontario

314-553-3600 905-948-3411

www.white-rodgers.com

www.emersonclimate.com

The Emerson logo is a trademark and
a service mark of Emerson Electric Co.

WR-8442-2