White Rodgers 21M51U-843 Universal Two-stage HSI Integrated Furnace Control Kit
White Rodgers 21M51U-843 Universal Two-stage HSI Integrated Furnace Control Kit Replaces Goodman Amana 20300003
Features
• 120 VAC Ignitor Output
• 120 VAC Two-Speed Inducer Output
• 120 VAC Humidifier Output
• 120 VAC Electronic Air Cleaner Output
• 120 VAC 3-Speed PSC Circulator Output
• 2-Stage Gas Valve Output
• Fuse Protection – 3 Amp
• 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 Mode)
• Historical Fault Retrieval by Pushbutton
• YLO, Y, W1, W2, R, G, C, TWIN 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: 530 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
Circulator Relays: 14.5 FLA – 25.0 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 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
Universal
50M51-843
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
Automatic reset time: 60 minutes
Electronic air cleaner: yes
Humidifier: yes
Twin: yes
Timing Specifications
(All times are in seconds unless noted otherwise)
* These times will vary depending on option
switch position.
White Rodgers 21M51U-843 Universal Two-stage HSI Integrated Furnace Control Kit Replaces Goodman Amana 20300003
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