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CONTENTS
3
WATER CHEMISTRY 2
WARNINGS 4
Pay Attention to These Terms 4
RECEIVING EQUIPMENT 5
GENERAL
SPECIFICATIONS 5
INSTALLATION 5
Code Requirements 5
Base Installation 5
Clearances 6
Combustion Air (Indoor Units Only) 6
Venting Connections 7
Gas Supply Connections 8
Water Connections 10
CONTROLS 10
Flow Switch 10
Water Pressure Switch 11
Automatic Chlorinators and Chemical
Feeders 11
Unitherm Governor Operation 11
Companion Flange Connections
(Models 926-1223) 11
Mounting the Poolstat Control with Front-
Mounted Loop Using Mounting Slots 12
Mounting Well into System Return Loop
Pipe - Front-Mounted Loop 14
Piping Configurations for Raytherm
Commercial Pool Heaters (926-1223) 15
Piping Configurations for Raytherm
Commercial Pool Heaters (1287-1826) 16
Piping Configurations for Raytherm
Commercial Pool Heaters (2100-4001) 17
Temperature Controls 18
External Auxiliary Bypass Valve (Where
Required) Models 926-1223 Only 18
Auxiliary Bypass Valve Adjustment 18
Electrical Wiring 19
Wiring Diagram—Models 926–1223 20
Wiring Diagram—Models 1287–1826 21
Wiring Diagram—Models 2100–2500 22
Wiring Diagram—Models 3001–4001 23
SERVICING 24
General Location Of Controls 24
Temperature Control 24
Pressure Switch 24
Pressure Switch Adjustment 24
Two-Speed Pumps 25
Pilot Safety 25
START-UP PROCEDURES 25
Before Start-Up 25
Start-Up 25
After Start-Up 26
INSPECTION PROCEDURES 26
Burners 26
CONTROLS 26
SERVICING PROCEDURES 27
Tube Cleaning Procedure (Typical) 27
Heat Exchanger Reassembly 27
Burner Drawer Removal 27
Gas Valve Removal 27
Main Burner and Orifice Removal 28
Pilot Removal and Cleaning 28
Heat Exchanger Removal 28
Combustion Chamber Removal 29
Control Well Replacement 29
Tube Replacement Procedure 29
Procedure For Cleaning Flue Gas
Passageways 29
Unitherm Governor Replacement 30
MAINTENANCE AND CARE 30
Winterizing Your Heater 31
TROUBLESHOOTING 32
WARRANTY 35