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A.O. Smith
Water Heater
AHPW-25
A.O. Smith AHPW-25 Installation And Operating Manual
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7
MODEL
CHARACTERISTICS
MODEL
CHARACTERISTICS
T
able 1. Gas Pressure and Electrical Characteristics
*Manifold Pressure
Minimum
Supply Pressure
Maximum
Supply Pressure
Electrical Characteristics
Gas T
ype
In. W
.C. (kP
A)
In. W
.C.(kP
A)
In W
.C.(kP
A)
V
olts/Hz
Amperes
Natural
0” (0)
3.5(1.10)
14(3.49)
120/60
<10
* The manifold pressure is the factory setting and is not adjustable.
A
negative pressure will be seen with just the blower
running without the Gas Control V
alve open.
6
8
Table of Contents
Table of Contents
2
Safe Installation, Use, and Service
3
Important Definitions
3
Approvals
3
General Safety Information
4
Precautions
4
Grounding Instructions
4
Hydrogen Gas Flammable
4
Limiting the Risk of Scalding
4
Introduction
6
Abbreviations Used
6
Qualifications
6
Preparing for Installation
6
Model Characteristics
7
Features and Components
8
Controls and Switches
10
Installation Considerations
11
Locating the Water Heater
11
Combustion Air and Ventilation
13
Corrosion and Water Quality
13
Water Heater Installation
14
Planning the Vent System
14
Vent Kit
15
Vent Pipe Material
15
Vent Pipe Length and Sizing
16
Polypropylene Vent Systems
16
Power Direct Venting (PDV)
18
Termination Clearances Sidewall Power Vent
19
Low Profile Side Wall Vent Termination
21
Multiple Concentric Vent Termination
23
Low Profile Vent Installation
23
Calculating Equivalent Feet (PDV)
25
Power Vent (PV)
25
Termination Clearances Other than Sidewall Direct Vent
26
Calculating Equivalent Feet (PV)
28
Vent Installation
28
Condensate (Exhaust)
28
Water Line Connections
29
Thermostatic Point-Of-Use Mixing Valves
29
Closed Water Systems
30
Thermal Expansion
30
Temperature-Pressure Relief Valve
31
Storage Tank Installation
31
Space Heating and Potable Water System
32
Combo Heating Inlet and Outlet Side Taps
32
Combo Heating
32
System Requirements
32
Installation
33
Electrical Supply
33
Dedicated Power Wiring and Breakers
33
Power Fluctuations and Electrical Noise
34
Electrical Wiring
34
Gas Supply Systems
34
Gas Supply Regulator
35
Gas Line Installation
35
Gas Line Leak Testing
37
Gas Line Purging
37
High Altitude Installations
37
Temperature Regulation
38
Temperature Control
38
Hot Water Can Scald
38
Control System Operation
40
Buttons
40
Temperature Setpoint
40
Installation Checklist
41
Start up
42
Start up Conditions
42
Smoke/Odour
42
Prior to Start up
42
Filling the Water Heater
42
Initial Start up
42
Preparation
42
Lighting the Water Heater
42
Periodic Maintenance
44
Venting System Inspection
44
Draining and Flushing
44
Sediment Removal
45
Lime Scale Removal
45
Burner Operation and Inspection
45
Combustion Chamber and Burner Cleaning
45
Housekeeping
46
Anode Rod Maintenance
46
Temperature-Pressure Relief Valve Test
46
Service
47
Troubleshooting
48
Outlet Air Pressure Switch (OAPS)
48
Intake Air Pressure Switch (IAPS)
48
Basic Sequence of Operation
49
Monitor Flame Current
49
Burner Ignition Sequence
49
Water Leak Detection and Water Shut off Kit (Optional)
49
Error Codes
50
Error Priority
51
Leakage Checkpoints
52
Diagrams
53
Wiring Diagram
53
Service Parts List
54
Notes
55
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User's Information Manual
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4
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A.O. Smith AHPW-25 Specifications
General
Brand
A.O. Smith
Model
AHPW-25
Category
Water Heater
Language
English
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