A.O. Smith GPVX 75L Series User Manual

2 100271597
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
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Get To Know Your Water Heater - Gas Models
(List Referencing Figures 1-7). . . . . . . . . . . . . . . . . . . 7
Replacement Parts And Deliming Products . . . . . . . . 8
Combo Heating Inlet And Outlet Side Taps. . . . . . . . . 8
Water Piping - Mixing Valve Usage . . . . . . . . . . . . . . . 9
Mixing Valves
Water Heater Operation . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Requirements & Wiring Diagram . . . . . . . . 11
Safety Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
High Limit Controls (Energy Cut Off). . . . . . . . . . . . . 12
Thermostat/Water Temperature
Blower High Limit Switch
Blower Air Pressure Switch . . . . . . . . . . . . . . . . . . . . 12
Flammable Vapour Sensor . . . . . . . . . . . . . . . . . . . . 12
Locating The New Water Heater . . . . . . . . . . . . . . . . . 13
Facts To Consider About The Location . . . . . . . . . . . 13
Storage Of Flammable Liquids . . . . . . . . . . . . . . . . . 13
Clearances to combustibles
Floors with carpeting
Clearance for servicing
Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Chemical Vapour Corrosion . . . . . . . . . . . . . . . . . . . 15
Installing The New Water Heater . . . . . . . . . . . . . . . . . 16
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Space Heating And Potable Water Systems. . . . . . . 16
Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Requirements
Installation
Closed Water Systems . . . . . . . . . . . . . . . . . . . . . . . 18
Recirculation Loops. . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Temperature-Pressure Relief Valve. . . . . . . . . . . . . . 19
T&P valve discharge pipe requirements:
Temperature-Pressure Relief Valve and Pipe
Insulation
High Altitude Installation . . . . . . . . . . . . . . . . . . . . . . 20
Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Sediment Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Filling The Water Heater . . . . . . . . . . . . . . . . . . . . . . 22
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Termination Clearances Sidewall Power Vent. . . . . . 23
Blower Assembly Installation. . . . . . . . . . . . . . . . . . . 24
Planning The Vent System . . . . . . . . . . . . . . . . . . . . 24
Polypropylene Vent Systems . . . . . . . . . . . . . . . . . . 25
Condensate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Exhaust Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Important Notes and Warnings
Venting terminations and sizing
Vent screen installation
Calculating Equivalent Feet
Venting instructions
Vent pipe connection to blower
Coupling installations according to vent sizes
Blower Exhaust Direction . . . . . . . . . . . . . . . . . . . . . 30
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 31
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Operating The Temperature Control System . . . . . . . . 33
Gas Control Valve/Thermostat (160°) . . . . . . . . . . . . 34
Gas Control Valve/Thermostat (181°) . . . . . . . . . . . . 34
For Your Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Condensate
Smoke/odour
Strange sounds
Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . 35
Smelly water
“Air” In Hot-Water Faucets . . . . . . . . . . . . . . . . . . . . 35
Periodic Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 36
General Upkeep . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Venting System Inspection . . . . . . . . . . . . . . . . . . . . 36
Blower Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cleaning The Blower. . . . . . . . . . . . . . . . . . . . . . . . . 36
Burner Operation And Inspection . . . . . . . . . . . . . . . 37
Combustion Chamber And Burner Cleaning . . . . . . . 38
Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . . . 38
Temperature-Pressure Relief Valve Test . . . . . . . . . . 39
Draining And Flushing . . . . . . . . . . . . . . . . . . . . . . . . 39
To Drain The Water Heater Storage Tank
To Flush The Water Heater Storage Tank
Leakage Checkpoints. . . . . . . . . . . . . . . . . . . . . . . . . . 41
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Reference Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . 42
Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . 44
Resetting The Heater Control . . . . . . . . . . . . . . . . . . 46
Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Soft Lockout
Hard Lockout
Ignition State And Timing . . . . . . . . . . . . . . . . . . . . . 47
System Status And Error Codes . . . . . . . . . . . . . . . . 47
Reading The LED Flash Sequence. . . . . . . . . . . . . . 48
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

A.O. Smith GPVX 75L Series Specifications

General

Brand	A.O. Smith
Model	GPVX 75L Series
Category	Water Heater
Language	English