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FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
The 21M51U-843 is an aftermarket universal replacement
control kit for two-stage furnace products with PSC blower and
inducer motors.
This control replaces Goodman/Amana, Lennox/Armstong,
Trane/American Standard, and York applications.
TWINNING: 21M51U-843 can be twinned. Both control
boards must be from the same manufacturer for proper
functionality.
ELECTRICAL RATINGS:
Input Voltage: 120 VAC, 60 Hz (Class II transformer required)
Max. Input Current @ 24 VAC: 800mA + MV
Relay & Triac Load Ratings:
Gas Valve Relays: 1.5 amps @ 24 VAC, 60 Hz
Ignitor: 4.0 amps @ 132 VAC, 60 Hz
Inducer Relays: 2.2 FLA - 3.5 LRA @ 120 VAC
Circulator Relays: 14.5 FLA - 25.0 LRA @ 120 VAC
Humidifer Load: 1.0 A max @ 120 VAC
Electronic Air Cleaner Load: 1.0 A max @ 120 VAC
Flame Current Requirements:
Minimum current to ensure fame detection: 0.3 µA DC*
*Measured with a DC microammeter in series with fame
probe lead
Operating Temperature Range:
-40° to 175°F (-40 to 80°C)
Humidity Range:
5% to 93% relative humidity (non-condensing)
Gases Approved: Natural, Manufactured, Mixed, Liquid
Petroleum, and LP Gas Air Mixtures are all approved
for use.
Universal Integrated Two-Stage
120V Hot Surface Ignition Control Kit
INSTALLATION INSTRUCTIONS
Parts included:
• 50M51-843 Integrated Furnace Control
• 21D64-2 HotRod Universal Ignitor Kit (120V)
• Trane Ignitor Mounting Bracket
• 3 – Mounting Screws
• 5 – Motor Lead Extensions
• Installation Instructions
www.copeland.com/white-rodgers
21M51U-843
DESCRIPTION
SPECIFICATIONS
CAUTION
!
Risk of Electric Shock.
Disconnect electric power
to system until installation
is complete. Do not use on
circuit exceeding specified
voltage. Higher voltage will
damage control and could
cause shock or fire hazard.
This control is not intended
for use in locations where
it may come in contact with
water.
May cause flame rollout.
Shut off main gas to heat-
ing system until installa-
tion is complete.
PART NO. 37-7116002
Replaces 37-7116001
1726
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Related Manuals for Copeland WHITE RODGERS 21M51U-843
Summary of Contents for Copeland WHITE RODGERS 21M51U-843
- Page 1 Shut off main gas to heat- 5% to 93% relative humidity (non-condensing) ing system until installa- Gases Approved: Natural, Manufactured, Mixed, Liquid tion is complete. Petroleum, and LP Gas Air Mixtures are all approved for use. PART NO. 37-7116002 Replaces 37-7116001 www.copeland.com/white-rodgers 1726...
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Page 2: Installation
INSTALLATION MOUNTING AND WIRING 6. Secure any wiring with the provided cable ties as necessary. Refer to Typical System Wiring Diagram on page 3. 7. Reinstall unit access panels and reconnect electric power NOTE: All wiring should be installed according to local and and gas supply to the unit. -
Page 3: Wiring Diagram
WIRING DIAGRAM... -
Page 4: Operation
OPERATION HEAT MODE Heating until Thermostat Output is Satisfed Blower Off Delay 15 s 17 s 3 s 30, *45 s 15 s *90, 120, 150, 180 s Thermostat - W2 Thermostat - W/W1 High Speed Inducer (IND HI) Low Speed Inducer (IND LO) Pressure Switch (PS2) Pressure Switch (PS1) Ignitor... -
Page 5: Fan Mode
OPERATION FAN MODE Output Fan until Thermostat is Satisfied 2 sec Thermostat - G Blower (Lo Heat Speed) Green LED – 1 Flash TROUBLESHOOTING Green Amber Error/Condition Comments/Troubleshooting Flash Flash Flash Flame sensed when no flame Verify the gas valve is operating and shutting down properly. Flame in burner assemble should extinguish promptly at the should be present. -
Page 6: Control Reset
When the control is in standby mode (no call for heat or cool), itself. press the "LAST ERROR" button for fve to ten seconds or until the diagnostic LED begins to rapid fash.The LED will fash three green fashes when the memory has been cleared. www.copeland.com/white-rodgers ©2024 Copeland LP.
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