Table of Contents
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Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
The kit Includes:
• 50V51-843 Ignition Control Module
• 21D64-2 Ignitor Kit
• Set of Interconnect Harnesses (for Goodman)
The 50V51-843 is a two-stage automatic gas interrupted ignition
control employing a microprocessor to continually monitor,
analyze, and control the proper operation of the gas burner and
inducer. The 50V51-843 provides signals for proper operation
of a variable fan speed circulator blower.
Installation should be done by a qualified heating and air
conditioning contractor or licensed electrician.
If in doubt about whether your wiring is millivolt, line, or low voltage,
have it inspected by a qualified heating and air conditioning
contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
Following installation or replacement, follow manufacturer's
recommended installation/service instructions to ensure proper
operation.
CAUTION
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
CONTENTS
Description .......................................................................1
Precautions ......................................................................1
Specifications ...................................................................2
Timing Table & Definitions ................................................2
Installation ........................................................................3
Option Switch Settings .....................................................4
Mounting Hole Template ..................................................5
Wiring ..............................................................................6
Operation .........................................................................8
Troubleshooting ................................................................8
Integrated Two-Stage/Variable Speed Motor
Hot Surface Ignition Control Kit
INSTALLATION INSTRUCTIONS
Signals interpreted during continual surveillance of the two-
stage thermostat and flame sensing element initiate automatic
ignition of the burner, sensing of the flame, and system shutoff
during normal operation.
The control incorporates system fault analysis for quick gas
flow shutoff, coupled with automatic ignition retry upon sensing
a fault correction.
Failure to comply with the following
warnings could result in personal injury
or property damage.
FIRE HAZARD
• Do not exceed the specified voltage.
• Protect the control from direct contact with water
(dripping, spraying, rain, etc.).
• If the control has been in direct contact with water,
replace the control.
• Label all wires before disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
• Route and secure wiring away from flame.
SHOCK HAZARD
• Disconnect electric power before servicing.
• Ensure proper earth grounding of appliance.
• Ensure proper connection of line neutral and line
hot wires.
EXPLOSION HAZARD
• Shut off main gas to appliance until installation is
complete.
white-rodgers.com
emersonclimate.com
21V51U-843
DESCRIPTION
PRECAUTIONS
WARNING
PART NO. 37-7115D
Replaces 37-7115C
1617
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Summary of Contents for White Rodgers 21V51U-843
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Page 1: Table Of Contents
21V51U-843 Integrated Two-Stage/Variable Speed Motor Hot Surface Ignition Control Kit INSTALLATION INSTRUCTIONS Operator: Save these instructions for future use! FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. -
Page 2: Specifications
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 21V51U-843 TIMING TABLE (All times are in seconds, unless noted otherwise) Event Definition... -
Page 3: Installation
INSTALLATION MOUNTING AND WIRING The 50V51-843 has only one serviceable part –an automotive type fuse, which protects the low voltage transformer from dam- All wiring should be installed according to local and national age if the output is short-circuited. If the fuse has opened up, electrical codes and ordinances. -
Page 4: Option Switch Settings
OPTION SWITCH SETTINGS FURNACE MANUFACTURER Average Calculated DIP Switch Selection for OEM Applications Duty Cycle or is less Low to High % Equals than Stage Delay Demand 12 minutes Light OFF ON 10 minutes Light to Average Trane 7 minutes Average Thermo Pride/ 5 minutes... -
Page 5: Mounting Hole Template
MOUNTING HOLE TEMPLATE MOUNTING HOLE TEMPLATE FOR MOUNTING HOLE LOCATIONS... -
Page 6: Wiring
WIRING The 50V51-843 has only one serviceable part –an automotive cause of the control’s problem, replace the entire 50V51-843 type fuse, which protects the low voltage transformer from dam- control. There are no other user serviceable parts. age if the output is short-circuited. If the fuse has opened up, Following installation or replacement, follow appliance manu- remove whatever caused the short circuit and replace the fuse facturer’s recommended installation or service instructions to... - Page 7 WIRING 50V51-843 TYPICAL SYSTEM WIRING TABLE 50V51-843 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION two-stage thermostat W1 terminal (or equivalent) two-stage thermostat W2 terminal (or equivalent) two-stage thermostat G terminal (or equivalent) 9-screw two-stage thermostat R terminal (or equivalent) terminal two-stage thermostat B/C terminal (or equivalent) two-stage thermostat Y terminal (or equivalent) block two-stage thermostat Y2 terminal (or equivalent)
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Page 8: Operation
OPERATION NORMAL OPERATION – HEAT ON Note: If the module is configured for a single stage thermostat and running on second stage when the call for heat ends, the When the thermostat calls for heat the module verifies the circulator will drop to low speed after 30 seconds and continue pressure switches are open and energizes the inducer (high until the heat off delay ends. - Page 9 TRI-COLOR (DSI LED) DIAGNOSTIC TABLE Green Amber Red LED Error/Condition Comments/Troubleshooting Flash Flash Flash Flame sensed when no flame should Verify the gas valve is operating and shutting down properly. Flame be present in burner assemble should extinguish promptly at the end of the cycle.
- Page 10 NOTES...
- Page 11 NOTES...
- Page 12 White-Rodgers is a business of Emerson Electric Co. The Emerson logo is a white-rodgers.com trademark and service mark emersonclimate.com of Emerson Electric Co.
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