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INSTALLER MUST READ
PAGE 3 CONTAINS WIRING HARNESS AND
BLOWER CONNECTION INSTRUCTIONS FOR
ALL APPLICATIONS AND IMPORTANT OEM
REPLACEMENT INSTRUCTION FOR:
● TRANE / AMERICAN STANDARD
● RHEEM / RUUD
● BRYANT / CARRIER / DAY & NIGHT / PAYNE
The 50M56U-843 kit is a Universal Single Stage HSI Integrated
Furnace Control that employs a microprocessor to continually
monitor, analyze, and control the proper operation of the gas
burner, inducer, and fan.
The kit contains:
• 50M56-843 Ignition Control Module
• 21D64-2 Ignitor Kit
• Set of Interconnect Harnesses
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
!
control. Short or incorrect wiring may damage the
thermostat.
CONTENTS
Description ................................................................... 1
Precautions .................................................................. 1
Specifications .............................................................. 2
Installation ................................................................... 2
Mounting & Wiring
Operation ..................................................................... 6
Troubleshooting ........................................................... 8
HSI Integrated Furnace Control Kit
INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS
CAREFULLY BEFORE INSTALLING OR OPERATING
THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
21D64-2
WARNING
!
Failure to comply with the following warnings could result
in personal injury or property damage.
FIRE HAZARD
• Do not exceed the specified voltage.
• Replace existing control with exact model and
dash number.
• 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.
www.white-rodgers.com
www.emersonclimate.com
50M56U-843
Universal Single Stage
DESCRIPTION
50M56-843
PRECAUTIONS
PART NO. 37-7042C
Replaces 37-7042B
1103
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Summary of Contents for White Rodgers 50M56U-843
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Page 1: Installation Instructions
● RHEEM / RUUD ● BRYANT / CARRIER / DAY & NIGHT / PAYNE The 50M56U-843 kit is a Universal Single Stage HSI Integrated Furnace Control that employs a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner, inducer, and fan. -
Page 2: Specifications
Refer to the wiring diagram and wiring table when connecting the 50M56U-843 control to other components of the system. UL approved, 105°C rated 18 gauge, stranded, 2/64” thick insulation wire is recommended for all low voltage safety circuit connections. - Page 3 INSTALLER MUST READ FOR PROPER INSTALLATION • Wiring harnesses and a Universal 21D64-2 ignitor are included in this package. Refer to the enclosed “Cross Reference and Harness Application Chart” (Part Number 37-7077) for harness selection and ignitor application information. Ignitor installation instructions are in the UNIVERSAL 21D64-2 Ignitor package included with this kit.
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Page 4: Wiring Diagram
WIRING DIAGRAM (LINE) HUMIDIFIER ELECTRONIC AIR CLEANER FLAME SENSOR PROBE 1 STAGE VALVE LEGEND Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = Normally closed switch N. O. = Normally open switch TYPICAL SYSTEM WIRING DIAGRAM 120 VAC 24 VAC CLASS II TRANSFORMER 24 VAC... - Page 5 50M56 TERMINAL TERMINAL TYPE Terminal block with captive screws HLO (Pin 1) MV LO (Pin 2) TH (Pin 3) PSO (Pin 4) RO OUT (Pin 5) TR (Pin 6) HLI (Pin 7) GND (Pin 8) MV COM (Pin 9) PSI (Pin 10) RO IN (Pin 11) MV HI (Pin 12) IND (Pin 1)
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Page 6: Heat Mode
If flame is not detected, both valves are de-energized, the ignitor is turned off, and the 50M56U-843 control goes into the “retry” sequence. The “retry” sequence provides a 60-second wait following an unsuccessful ignition attempt (flame not detected). - Page 7 LED will be on to indicate return to normal status. The 50M56U-843 has only one serviceable part –an automotive type fuse, which protects the low voltage transformer from damage if the output is short-circuited. If the fuse has opened up, remove whatever caused the short circuit and replace the fuse with only a 3 Amp automotive type fuse.
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Page 8: Troubleshooting
Red LED Flash Error/Condition External lockout (exceeded retries) Pressure switch stuck closed Pressure switch stuck open Open high temperature limit switch Flame sensed with gas valve de-energized Open rollout switch Low flame sense current Ignitor relay fault Rapid Flash Reversed polarity Continuous Normal operation Control failure...
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