Table Of Contents - A.O. Smith Gas Models Instruction Manual

TABLE OF CONTENTS ........................................................................2
SAFE INSTALLATION, USE AND SERvICE........................................3
APPROvALS ........................................................................................3
GENERAL SAFETY INFORMATION ....................................................4
Precautions .....................................................................................4
Grounding Instructions ...................................................................4
Hydrogen Gas Flammable ..............................................................4
TROUBLESHOOTING .........................................................................6
INTRODUCTION ..................................................................................7
Abbreviations Used ........................................................................7
Qualifications ..................................................................................7
Qualified Installer or Service Agency ........................................7
iCOMM™ & BACnet Compatible ....................................................7
Preparing For The Installation ........................................................7
FEATURES AND COMPONENTS .......................................................8
INSTALLATION CONSIDERATION ......................................................9
Rough in Dimensions .....................................................................9
Locating The Water Heater ...........................................................10
Insulation Blankets .......................................................................11
Combustion Air and ventilation .....................................................11
Unconfined Space ........................................................................11
Unusually Tight Construction ..................................................12
Confined Space ............................................................................12
Direct Vent Appliances ...........................................................12
Exhaust Fans .........................................................................12
Louvers and Grilles ................................................................12
Fresh Air Openings For Confined Spaces ....................................12
Outdoor Air Through Two Openings .............................................12
Outdoor Air Through One Opening ...............................................12
Outdoor Air Through Two Horizontal Ducts ..................................13
Air From Other Indoor Spaces ......................................................13
INSTALLING THE NEW WATER HEATER ........................................14
Chemical Vapor Corrosion ............................................................14
Water Piping .................................................................................14
Power Supply ...............................................................................14
Power Fluctuations and Electrical Noise ................................14
Dedicated Power Wiring and Breakers ..................................14
Polarity Sensitive ....................................................................14
Mixing valves ................................................................................15
Dishwashing Machines .................................................................15
Space Heating and Potable Water System ..................................15
Closed Water Systems .................................................................15
Thermal Expansion .......................................................................16
Temperature-Pressure Relief valve ..............................................17
T&P Valve Discharge Pipe Requirements: .............................17
Gas Piping ....................................................................................18
Condensate Piping .......................................................................18
High Altitude Installations .......................................................19
Sediment Traps (Drip Legs) ...................................................19
Filling the Water Heater ................................................................19
venting ..........................................................................................20
vent Pipe Termination ............................................................20
Planning the vent System ......................................................20
Installation of vent System .....................................................21
Vent Terminal Installation, Sidewall ........................................21
Installation Requirements - Commonwealth of Massachusetts ....22
Termination Clearances Sidewall Power Vent ..............................23
Termination Clearances Sidewall Direct Vent ...............................24
Sequence of Installations, Figure 18A ....................................25
Direct Vent Terminal Installation .............................................25
Installation Sequence .............................................................25
Vent Terminals Supplied with Heater Must be Used. .............25
Vertical Vent Terminal Installation ...........................................26
Concentric Vent Installation ....................................................27
Kit Components ......................................................................27
Safety Considerations ............................................................27
Installation Procedure 1 Roof Termination, see Figure C ......27
DIRECT vENT DIAGRAM ..................................................................30
vent Pipe Preparation...................................................................31
Primer .....................................................................................31
Primer and Cement ................................................................31

table of contents

Applicators ..............................................................................31
Controls and Switches ..................................................................33
Blower Prover Switch .............................................................33
Blocked Exhaust Switch .........................................................33
Blocked Intake Switch ............................................................33
On/Off Switch .........................................................................33
Hot Surface Igniter .................................................................33
TEMPERATURE REGULATION ........................................................36
Hi Limit Switch (E.C.O.) ................................................................36
CONTROL SYSTEM OPERATION ....................................................37
Overview .......................................................................................37
Commercial And Residential Models ......................................37
Control System Navigation ...........................................................37
User Input Buttons ..................................................................37
The Desktop Screen ...............................................................37
Status Icons ............................................................................38
Operating States ....................................................................39
Control System Menus ...........................................................39
User Settings & Control System Menus .......................................40
Temperatures .........................................................................40
Operating Set Point And Differential Adjustment ....................40
Temperatures (cont) ...............................................................41
Heater Status .........................................................................41
Display Settings ......................................................................42
Heater Information ..................................................................42
Current Fault ..........................................................................43
Fault History ...........................................................................43
Fault Occurrence ....................................................................43
Restore Factory Defaults ........................................................43
Service Contact Information ...................................................44
FOR YOUR INFORMATION ...............................................................45
Start Up Conditions ......................................................................45
Smoke/Odor ...........................................................................45
Thermal Expansion ................................................................45
Operational Conditions .................................................................45
Smelly Water ..........................................................................45
"Air" in Hot Water Faucet ........................................................45
PERIODIC MAINTENANCE ...............................................................46
Venting System Inspection ...........................................................46
Anode Rod Inspection ..................................................................46
Temperature-Pressure Relief valve Operation .............................46
Draining and Flushing ...................................................................46
To Drain the Water Heater Storage Tank ......................................47
To Flush the Water Heater Storage Tank ......................................47
Service ..........................................................................................47
MAINTENANCE .................................................................................48
Temperature-Pressure Relief valve Test ......................................48
LEAKAGE CHECKPOINTS ................................................................49
TROUBLESHOOTING .......................................................................50
Installation Checklist .....................................................................50
Water Heater Location............................................................50
venting ...................................................................................50
Gas Supply and Piping ...........................................................50
Condensate Drain ..................................................................50
Electrical Connections ............................................................50
Sequence Of Operation Flow Chart .............................................51
Operational Problems ...................................................................52
Rough Starting, Rough Operation ..........................................52
Momentary Ignition .................................................................52
Not Enough Or No Hot Water .................................................52
Water Is Too Hot .....................................................................52
Noisy Operation ......................................................................52
Replacement Parts .................................................................52
Fault and Alert Conditions ............................................................52
Fault Conditions .....................................................................52
Alert Conditions ......................................................................52
Resetting Control System Lock Outs .....................................53
Diagnostic Checks ..................................................................53
Fault and Alert Messages .......................................................54
NOTES ...............................................................................................56
LIMITED WARRANTY ........................................................................59
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