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A.O. Smith
Water Heater
GDHE-50 SERIES
A.O. Smith GDHE-50 SERIES User Manual
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58
CAUTION
LABEL
ALL WIRES PRIOR
TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER
AND
DANGEROUS OPERA
TION. VERIFY PROPER OPERA
TION
AFTER SERVICING.
Figure: 40 POWER VENT WIRING SCHEMA
TIC
WIRING DIAGRAM
57
59
Table of Contents
For Your Safety
1
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
Introduction
7
Abbreviations Used
7
Qualifications
7
Icommâ„¢ & Bacnet Compatible
7
Preparing for the Installation
7
Dimensions and Capacity Data
8
Rough in Dimensions: 50 Gallon Unit
8
Rough in Dimensions: 75 Gallon Unit
8
Features and Components
10
Controls and Switches
13
Installation Considerations
14
Locating the Water Heater
14
Insulation Blankets
15
Combustion Air and Ventilation
15
Unconfined Space
16
Confined Space
16
Fresh Air Openings for Confined Spaces
16
Outdoor Air through Two Openings
16
Outdoor Air through One Opening
16
Outdoor Air through Two Horizontal Ducts
17
Air from Other Indoor Spaces
17
Installation Requirements
18
Chemical Vapor Corrosion
18
Water Piping
18
Power Supply
18
Mixing Valves
19
Gas Piping
19
Gas Supply Systems
20
Gas Pressure Requirements
20
Supply Gas Regulator
20
Space Heating and Potable Water System
21
Closed Water Systems
21
Thermal Expansion
21
Temperature-Pressure Relief Valve
22
Condensate Piping
23
High Altitude Installations
23
Filling the Water Heater
23
Installation Requirements for the Commonwealth of Massachusetts
24
Venting Installation
25
Vent Installation Considerations
25
Polypropylene Installations
26
Vent Pipe Termination
27
Planning the Vent System
27
Installation of Horizontal through the Wall Vent System
27
Direct Vent Terminal Installation
28
Installation Sequence
28
Termination Clearances Sidewall Power Vent
29
Termination Clearances Sidewall Direct Vent
30
Vertical Vent Terminal Installation
31
Direct Vent Diagram
32
Concentric Vent Installation
33
Low Profile Termination Installation
36
Lighting and Operation Labels
37
Temperature Regulation
38
Control System Operation
39
Overview
39
Control System Navigation
39
User Settings & Control System Menus
42
Blocked Exhaust
45
Restore Factory Defaults
45
For Your Information
47
Start up Conditions
47
Operational Conditions
47
Periodic Maintenance
48
Venting System Inspection
48
Anode Rod INSPECTION
48
Powered Anode Rod (Optional Models)
49
Temperature-Pressure Relief Valve Test
49
Draining and Flushing
49
Service
50
Leakage Checkpoints
51
Troubleshooting
52
Installation Checklist
52
Sequence of Operation
52
Sequence of Operation Flow Chart
53
Operational Problems
54
Fault and Alert Conditions
55
Ignition Failure
56
Blower Prover Open
57
Blocked Air Intake
57
Wiring Diagram
58
4
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A.O. Smith GDHE-50 SERIES Specifications
General
Model
GDHE-50
Capacity
50 gallons
Energy Factor
0.67
Type
Gas
Fuel Type
Natural Gas/Propane
Warranty
6 years
Input BTU/hr
40, 000
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