White Rodgers 50A55-3797 Installation Manual download pdf

Trane White-Rodgers

CNT02891 50A55-474

CNT03799 50A55-476

CNT02789 50A55-571

50A55-3797

Integrated Furnace Control

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL

INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

INSTALLATION INSTRUCTIONS

The 50A55-3797 is an automatic gas interrupted

ignition control that employs a microprocessor to

continually monitor, analyze, and control the proper

operation of the gas burner, inducer, and fan.

Signals interpreted during continual surveillance of

the thermostat and ﬂame sensing element initiate

automatic ignition of the burner, sensing of the ﬂame,

and system shut-off during normal operation.

These controls incorporate system fault analysis for

quick gas ﬂow shut-off, coupled with automatic ignition

retry upon sensing a fault correction. It is designed as a

replacement for the following controls:

PRECAUTIONS

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 compo-

nents could cause the control to malfunction.

Following installation or replacement, follow manufacturer’s

recommended installation/service instructions to ensure

proper operation.

WARNING

Failure to comply with the following warnings could

result in personal injury or property damage.

FIRE HAZARD

• Donotexceedthespecied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ame.

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

PART NO. 37-7515B

Replaces 37-7515A

1422

CAUTION

Donotshortoutterminalsongasvalveorprimary

control. Short or incorrect wiring may damage

the thermostat.

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - 50A55-3797

Trane White-RodgersCNT02891 50A55-474CNT03799 50A55-476CNT02789 50A55-57150A55-379750A55-3797Integrated Furnace ControlFAILURE TO READ AND FOLLOW ALL

Page 2 - INSTALLATION

2SPECIFICATIONS INSTALLATION ELECTRICAL RATINGS [@ 77°F (25°C)]: Input Voltage: 25 VAC 50/60 Hz Max.InputCurrent@25VAC:0.45 amp Relay Load

Page 3 - WIRING

3 WIRINGCRGWYYWGRTHERMOSTATCOMPRESSORCONTACTORELECTRONICAIR CLEANERCIRCULATORBLOWER50A55-379724 VAC120 VAC24 VAC CLASS IITRANSFORMERHOT(LINE)NEUTRAL

Page 4

4WIRING 50A55-3797TERMINALTERMINALTYPESYSTEM COMPONENTCONNECTIONTYPICAL SYSTEM WIRING TABLE low voltage thermostat W terminal (or equivalent)

Page 5 - MANUAL FAN ON MODE

5 OPERATION OPTION SWITCHESThe option switches on the 50A55-3797 control are used to determine the length of the heat delay-to-fan-off periods and c

Page 6 - OPERATION

62. Interrupt the 24 VAC power at the control for at least one second. You may also need to reset the ﬂame rollout sensor switch.3. After one hour i

Page 7 - TROUBLESHOOTING

7Red LED Flash Error/Condition Comments/TroubleshootingSlow Flash Normal operation Normal – no Call for HeatFast Flash Normal operation Normal – Call

Page 8 - The Emerson logo is a

TECHNICAL SUPPORT: 1-888-725-9797White-Rodgers is a business of Emerson Electric Co.The Emerson logo is a trademark and service mark of Emerson Elec

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White Rodgers 50A55-3797 Installation Manual

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Summary of Contents

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