Table of Contents
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COMMERCIAL 24 VOLT FLUE DAMPER
SERIES WATER HEATER WITH HONEYWELL
INTEGRATED CONTROL SYSTEM
Manual 47985A REV 08/18
Gas Water Heaters
SERVICE
MANUAL
and Instructions for Service
Troubleshooting Guide
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
For The Bradford White
"D" Series Models:
D38T155
D75T(125,160,300)
D65T(370,399)
D80T(180,199,250)
D80T(425,505)
D100T(199,250)
D80L(399,450,505)
D100L(199,250,270,300)
D100S(199,250)
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Table of Contents
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Summarization of Contents
Service Manual
Commercial 24 Volt Flue Damper Series Water Heater
Identifies the specific water heater model covered by this manual.
General Safety Warning
Highlights critical safety information regarding potential hazards.
Sequence of Operation
Lockout Conditions
Explains "Soft" and "Hard" lockout conditions and their reset procedures.
Troubleshooting
Troubleshooting Common Faults
Guides through diagnosing common operational faults and error codes.
Service Mode Access and Operation
Covers accessing service mode and interpreting various diagnostic displays.
Error Codes and Lockout Reset
Details retrieving error history and resetting lockout states.
Service Procedure D24-I: Thermostat Circuit Testing
Thermostat Circuit and Sensor Testing
Steps for testing thermostat circuit and sensor functionality.
Sensor Resistance Testing
Procedure for measuring sensor resistance against temperature charts.
Service Procedure D24-II: Pilot Operation and Inspection
Pilot Operation Testing
Guides through testing pilot ignition and flame sensing.
Pilot Inspection
Details inspection of the pilot assembly, orifice, and flame rod.
Service Procedure D24-III: Main Burner Operation Testing
Main Burner Operation Testing
Steps to diagnose and test main burner ignition and operation.
Service Procedure D24-IV: Main Burner & Pilot Removal and Inspection
Main Burner and Pilot Removal
Instructions for safely removing the main burner and pilot assembly.
Main Burner and Pilot Inspection
Guidance on inspecting burner tubes, ports, and pilot shield.
Service Procedure D24-VI: Anode Removal and Inspection
Anode Rod Removal and Inspection
Instructions for removing and inspecting anode rods for depletion.
Anode Rod Locations
Diagrams showing approximate locations of anode rods on various models.
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