White Rodgers 50M56U-751 Installation Instructions Manual
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White Rodgers 50M56U-751 Installation Instructions Manual

Carrier single stage hsi integrated furnace control kit
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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 50M56U-751 kit is a Single Stage HSI Integrated Furnace
Control kit for Carrier. This kit replaces the following Carrier
controls:
Carrier
HK42FZ004
HK42FZ009
HK42FZ007
HK42FZ011
HK42FZ008
HK42FZ013
*Universal replacement for all Carrier controls.
The control employs a microprocessor to continually monitor,
analyze, and control the proper operation of the gas burner,
inducer, and fan.
Twinning: The control board in this Kit CANNOT be
twinned with any of the Carrier circuit boards.
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.
White-Rodgers
HK42FZ016
50M56-751
HK42FZ034
325878-751*
white-rodgers.com
emersonclimate.com
50M56U-751
Carrier Single Stage
HSI Integrated Furnace Control Kit
INSTALLATION INSTRUCTIONS
The kit contains:
1 – 50M56-751 ignition control board
1 – Set of interconnect harnesses
1 – Manual
1 – Bag of accessories
50M56-751
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.
DESCRIPTION
PRECAUTIONS
PART NO. 37-7513C
Replaces 37-7513B
1611

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Summary of Contents for White Rodgers 50M56U-751

  • Page 1 INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. DESCRIPTION The 50M56U-751 kit is a Single Stage HSI Integrated Furnace The kit contains: Control kit for Carrier. This kit replaces the following Carrier 1 – 50M56-751 ignition control board controls: 1 –...

  • Page 2: Specifications

    • Ensure proper earth grounding of appliance. Refer to the wiring diagram and wiring table when connecting • Ensure proper connection of line neutral and line the 50M56U-751 control to other components of the system. hot wires. UL approved, 105°C rated 18 gauge, stranded, 2/64” thick...
  • Page 3 INSTALLATION Replacing HK42FZ004, HK42FZ007, INSTALLER MUST READ FOR PROPER HK42FZ008, HK42FZ009, HK42FZ011, INSTALLATION and HK42FZ016 Use Old Style Wiring Harness Adaptor. Reference Fig. 2, • Before removing existing control board, tag wires to assure Table 1 and Wiring Diagram. proper connection to new board. 1.

  • Page 4: Typical System Wiring Diagram

    WIRING DIAGRAM TYPICAL SYSTEM WIRING DIAGRAM NEUTRAL (LINE) (LINE) 120 VAC 24 VAC CLASS II TRANSFORMER 24 VAC 50M56 COOL LO HEAT CIRCULATOR HI HEAT BLOWER LINE - H XFMR - H EAC - H HUM - H PARK PARK INDUCER IND-N* Optional...
  • Page 5 WIRING DIAGRAM TYPICAL SYSTEM WIRING TABLE 50M56 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION low voltage thermostat W terminal (or equivalent) low voltage thermostat G terminal (or equivalent) Terminal low voltage thermostat R terminal (or equivalent) block with low voltage thermostat Y terminal (or equivalent) captive (2nd wire from Y terminal goes to 24 VAC HOT side of screws...

  • Page 6: Operation

    In the event of a retry, the warm-up time will be increased by one second and locked in at that duration. Once the warm-up The 50M56U-751 is equipped with a self test routine used time is locked, it remains fixed until another call for heat results during the control’s installation.

  • Page 7: System Lockout And Diagnostic Features

    If a failure occurs, the LED will indicate a failure code as shown in Troubleshooting The 50M56U-751 has only one serviceable part –an automotive section. The control will store the last five fault codes. If the...

  • Page 8: Troubleshooting

    Control failure Verify power to the control, replace control if power is at the control and no lit Red LED TECHNICAL SUPPORT: 1-888-725-9797 White-Rodgers is a business of Emerson Electric Co. The Emerson logo is a white-rodgers.com trademark and service mark emersonclimate.com...

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