2 www. lochinvar .com 100304522_2000545236 _Rev. 02
TABLE OF CONTENTS
Safe Installation, Use And Service . . . . . . . . . . . . . . . . . 3
General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Qualified Installer Or Service Agency . . . . . . . . . . . . . 6
Preparing For The Installation. . . . . . . . . . . . . . . . . . . 6
Installation Requirements For The Commonwealth Of
Massachusetts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Get To Know Your Water Heater - Gas Models (List
Referencing Figures 1-5) . . . . . . . . . . . . . . . . . . . . . . 9
Replacement Parts And Deliming Products . . . . . . . 10
Combo Heating Inlet And Outlet Side Taps. . . . . . . . 10
Water Piping - Mixing Valve Usage . . . . . . . . . . . . . . 11
Mixing Valves
Water Heater Operation . . . . . . . . . . . . . . . . . . . . . . 12
Electrical Requirements & Wiring Diagram . . . . . . . . 13
Safety Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
High Limit Controls (Energy Cut Off). . . . . . . . . . . . . 14
Thermostat/Water Temperature
Blower High Limit Switch
Blower Air Pressure Switches . . . . . . . . . . . . . . . . . . 14
Locating The New Water Heater . . . . . . . . . . . . . . . . . 14
Facts To Consider About The Location . . . . . . . . . . . 14
Clearances To Combustibles
Floors With Carpeting
Clearances For Servicing
High Ambient Temperature Installations . . . . . . . . . . 15
Important Notes and Warnings
Insulation Blankets . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installing The New Water Heater . . . . . . . . . . . . . . . . . 17
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Space Heating And Potable Water Systems. . . . . . . 17
Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
System Requirements
Installation
Closed Water Systems . . . . . . . . . . . . . . . . . . . . . . . 19
Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Temperature-Pressure Relief Valve. . . . . . . . . . . . . . 20
T&P Valve Discharge Pipe Requirements:
Temperature-Pressure Relief Valve And Pipe
Insulation
High Altitude Installation . . . . . . . . . . . . . . . . . . . . . . 21
Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Sediment Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Filling The Water Heater . . . . . . . . . . . . . . . . . . . . . . 24
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Vent Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Termination Clearances (Side Wall) . . . . . . . . . . . . . 26
Termination Types . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Side Wall Vent Termination (Standard) . . . . . . . . . . . 27
Roof Vent Termination (Standard) . . . . . . . . . . . . . . . 27
Side Wall Vent option For Cold Climates . . . . . . . . . 28
Deluxe Horizontal Venting Kit . . . . . . . . . . . . . . . . . . 28
“Pyramid” Vent Terminal
“Mushroom” Vent Terminal
Connections To The Air Box
Low Profile Side Wall Vent Termination. . . . . . . . . . . 30
Installation Procedure
Concentric Vent Termination . . . . . . . . . . . . . . . . . . . 31
Multiple Concentric Vent Termination . . . . . . . . . . . . 32
Tee Termination (Sidewall & Roof) . . . . . . . . . . . . . . 32
Vent Pipe Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Polypropylene Vent Systems . . . . . . . . . . . . . . . . . . 34
Vent Pipe Length And Sizing. . . . . . . . . . . . . . . . . . . 34
Vent Screens
Vent Pipe Installation
Vent Pipe Runs
Vent Terminal Installations
Vent Pipe Preparation . . . . . . . . . . . . . . . . . . . . . . . . 38
Blower Assembly Installation. . . . . . . . . . . . . . . . . . . 40
Connections To The Blower And Air Duct
Condensate (Exhaust) . . . . . . . . . . . . . . . . . . . . . . . 42
Condensate (Intake) . . . . . . . . . . . . . . . . . . . . . . . . . 42
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 43
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Operating The Temperature Control System . . . . . . . . 45
Gas Control Valve/Thermostat . . . . . . . . . . . . . . . . . 46
For Your Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Condensation
Smoke/Odor
Strange Sounds
Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . 47
Smelly Water
“Air” In Hot-Water Faucets . . . . . . . . . . . . . . . . . . . . 47
Periodic Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 48
General Upkeep . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Venting System Inspection . . . . . . . . . . . . . . . . . . . . 48
Burner Operation And Inspection . . . . . . . . . . . . . . . 48
Combustion Chamber And Burner Cleaning . . . . . . . 49
Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Temperature-Pressure Relief Valve Test . . . . . . . . . . 49
Draining And Flushing . . . . . . . . . . . . . . . . . . . . . . . . 50
To Drain The Water Heater Storage Tank
To Flush The Water Heater Storage Tank
Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . . . 51
Leakage Checkpoints. . . . . . . . . . . . . . . . . . . . . . . . . . 52
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Reference Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . 53
Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . 55
Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Soft Lockout
Hard Lockout
Resetting The Heater Control . . . . . . . . . . . . . . . . . . 55
Ignition State And Timing . . . . . . . . . . . . . . . . . . . . . 55
System Status And Error Codes . . . . . . . . . . . . . . . . 56
Reading The LED Flash Sequence. . . . . . . . . . . . . . 56
Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Other Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
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