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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.
DESCRIPTION
The 50T35-743 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. This control incorporates 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:
Model
White-Rodgers 50T35-743
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 condi-
tioning 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.
Index
Description
Precautions
Specifications
Installation
Typical System Wiring
Replaces
Goodman B18099-06
Goodman B18099-08
Goodman B18099-10
Goodman B18099-13
Page
1
1
2
3
5
www.white-rodgers.com
50T35-743
Integrated Furnace Control
INSTALLATION INSTRUCTIONS
WARNING
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 servic-
ing 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.
PART NO. 37-6533B
Replaces 37-6533A
0614
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Summary of Contents for White Rodgers 50T35-743
-
Page 1: Installation Instructions
INJURY AND/OR PROPERTY DAMAGE. DESCRIPTION The 50T35-743 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. -
Page 2: Specifications
Gases Approved: Natural, Manufactured, Mixed, Liquified Petroleum, and LP Gas Air Mixtures are all approved for use. Timing Specifications (All times are in seconds, unless noted otherwise) maximum 0.8 sec 2.0 sec 50T35-743 2 times 25/29 (90+ option) 60 minutes... -
Page 3: Fire Hazard
(R, W & G). Remove the existing HSI module. Care should be exer- cised to avoid damage to the nylon standoffs. Install the 50T35-743 module. Reconnect the edgecard connector making sure of good contact. Push the 9 pin connector into the HSI module. It can go in only one way. -
Page 4: Installation
DIAGNOSTIC FEATURES The 50T35-743 control continuously monitors its own operation and the operation of the system. If a fault occurs, the LED will indicate a fault code as shown below. If the fault is internal to the control, the light will stay off. -
Page 5: Typical System Wiring Diagram
IGNITOR HEAT COOL * The twinning feature is available only on models with six screw terminals; one of these terminals will be designated “TWIN”. All 50T35-743 controls used in twinning applications must have the “TWIN” terminal. NEUTRAL (LINE) VALVE INDUCER... - Page 6 LIMO COOL HEAT NEUTRAL (4 terminals) TRNS * All 50T35-743 controls used in twinning applications must have the “TWIN” terminal. † Maximum recommended flame probe wire length is 36 inches. White-Rodgers is a division of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co.
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