A.O. Smith GAHH 50 100, PCG6240T403NOV 100, PCG2J5040T3NOV 100, PCG250T403NOV 100 Table of Contents

TABLE OF CONTENTS
INTRODUCTION:
Service Handbook Introduction	3
Warnings and Cautions	4
Table Of Contents	5
INSTALLATION / OPERATION:
Basic Installation & Operation	6
Combustion Air and Vent System Requirements	7-10
KNOW YOUR WATER HEATER:
Know the Water Heater’s Component Parts	11-13
Water Heater Operation	14
Filling and Draining the Water Heater	15
Lighting Instructions	16
ADJUSTING TEMPERATURE CONTROL:
Adjusting the Temperature on the Electronic Control Display	17
Using the Electronic Control Display	18-19
Electronic Control Display Troubleshooting	20-23
COMPONENTS REMOVAL / REPLACING:
External Inspection and Cleaning	24
Electronic Control Display Removal / Replacement	25
Powered Anode Removal / Replacement	26-27
Pressure Switch Removal / Replacement	28
Transformer Removal / Replacement	29-30
Air Intake Chamber Box Removal / Replacement	31-33
Wiring Harnesss Removal / Replacement	34-36
Air Intake Chamber Fan Removal / Replacement	37-38
Pressure Tubing Removal / Replacement	39-40
Inner Door/Manifold/Burner Assembly Removal / Replacement	41-42
Flame Sense/Hot Surface Igniter Removal / Replacement	43
Burner Removal / Replacement	44-46
Burner Orifice Removal / Replacement	47-49
Gas Control Valve/Thermostat Removal / Replacement	50-52
CHECKPOINTS / GENERAL INFORMATION:
Checking the Gas Supply Pressure	52
Gas Water Heater Sizing Guide -and- Leakage Checkpoints	53
General Information	54-55

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