WARNINGS 4
Pay Attention to These Terms 4
WATER CHEMISTRY 5
Automatic Chlorinators &
Chemical Feeders 5
SAFETY 6
Water Temperature Safety 6
INTRODUCTION 6
Ratings & Certifications 6
Model Identification 7
Specifications 7
Unpacking 7
INSTALLATION 8
Installation Codes 8
Clearances 8
Base Installation 8
Outdoor Installation 8
Indoor Installation 10
Combustion & Ventilation Air 10
Gas Connections 11
Water Connections 13
Electrical Connections 15
Control Adjustments—Millivolt 16
Wiring Diagrams 17
Post Start-Up Inspection 20
Cold Weather Operation 20
MAINTENANCE 21
SERVICE 21
Water Pressure Switch 21
Flame Roll-Out Safety Switch 22
High Limits 22
Pilot Safety—Millivolt Models 22
Burner Tray Removal 22
Gas Valve Removal 24
Main Burner & Orifice Removal 24
Igniter Removal & Cleaning (Electronic) 24
Ignition Control Fault Codes 24
Pilot Removal & Cleaning (Millivolt) 25
Heat Exchanger Removal 25
Tube Cleaning Procedure 25
De-sooting Procedure 25
Immersion Well Replacement— Millivolt 26
Replacement Parts 26
TROUBLESHOOTING 27
Mechanical 27
Electrical 28
General—Heater Will Not Fire 30
Electronic Control Logic
Flowchart 30
ILLUSTRATED PARTS LIST 31
CONTENTS
3
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