A.O. Smith Gdhe 50 Manuals

Manuals and User Guides for A.O. Smith Gdhe 50. We have 2 A.O. Smith Gdhe 50 manuals available for free PDF download: Service Handbook, Instruction Manual

A.O. Smith Gdhe 50 Service Handbook (72 pages)

SERIES 120 & 121 Commercial / Residential gas water heater

Brand: A.O. Smith | Category: Water Heater | Size: 8.4 MB

Table of CONTENTS
3
Qualifications
4
Service Warning
4
Service Reminder
4
Tools Required
4
Introduction
4
Instruction Manual
5
Closed Water Systems
5
Thermal Expansion
5
Air Requirements
5
Contaminated Air
5
Installation CONSIDERATIONS
5
Venting
6
General Venting Information
6
Maximum Equivalent Length Requirements
6
Intake Air Connection
7
Power Supply Test
8
Grounding and Polarity
8
Electrical Requirements
8
Installation Check List
9
Features and Components
10
Front & Back Views
10
Top View
11
Combustion Blower & Burner Assembly
11
How It Works
12
OPERATION and Service
12
Combustion Blower
13
Burner Assembly
14
Combustion Blower and Burner Removal
16
Flame Sensor
20
Flame Sensing Operation
20
Flame Sensing Current Test
21
Igniter
22
Igniter Current Test
22
- Venturi
  24
- Gas Valve
  25
- Gas Valve Voltage Tests
  25
- Gas Valve Removal
  26
- Gas Pressure
  27
- Gas Pressure Test
  28
- Gas Flow Test
  29
- Pressure Switches
  30
- Construction & Operation
  30
- Control System Monitoring
  31
- Pressure Switch Tests
  33
- Continuity Test During Standby
  33
- Continuity Test During Operation
  34
- Pressure Test During Operation
  34
- Blocked Exhaust Switch
  36
- Temperature Probe
  37
- Temperature Sensor Test
  37
- Eco Continuity Test
  38
- Control System Hardware
  39
- Uim (User Interface Module)
  39
- CCB (Central Control Board)
  41
- CCB Cover Removal and Replacement
  42
- CCB Circuit Board Layout
  43
- CCB Connection Identification
  44
- Wiring Diagram
  46
- Control System Operation
  47
Control System Features
47
Overview
47
Desktop Screen
48
User Input Buttons
48
Control System Navigation
48
Commercial and Residential Models
48
Status Icons
49
Operating States
50
Control System Menus
50
Temperatures
51
Heater Status
52
Display Settings
53
Heater Information
53
Restore Factory Defaults
54
Fault History
54
Fault Occurrence
54
Current Fault
54
Service Contact Information
55
Sequence of Operation
56
Sequence of Operation Flow Chart
57
Resetting the Control System
58
Things to Check before Servicing
58
Heater Status Menu
58
Not Enough Hot Water
58
Rough Starting/Rough Operation
58
Troubleshooting
58
Control System Unresponsive
59
Uim (Lcd) Is Blank
59
Uim Is Inoperable
59
Fault Messages
60
Temp Probe Open
60
Temp Probe Short
60
AC Reversed
60
Flame Sensor Short
61
Flame Detect Error
61
Energy Cut out (Eco)
62
Blocked Air Intake
63
Blocked Exhaust
64
Blower Prover Failure
64
Blower Prover Open
65
Low Igniter Current
66
Ignition Failure
67
Communication Failure
68

A.O. Smith Gdhe 50 Instruction Manual (56 pages)

POWER VENT/POWER DIRECT VENT RESIDENTIAL GAS WATER HEATERS WITH HOT SURFACE IGNITIO

Brand: A.O. Smith | Category: Water Heater | Size: 7.78 MB

For Your Safety
1
Table of Contents
2
General Safety Information
4
- Precautions
  4
- Grounding Instructions
  4
- Hydrogen Gas Flammable
  4
Introduction
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
- Confined Space
  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
- Chemical Vapor Corrosion
  14
- Water Piping
  14
- Power Supply
  14
Installing the New Water Heater
14
- Mixing Valves
  15
- Dishwashing Machines
  15
- Space Heating and Potable Water System
  15
- Close Water Systems
  16
- Thermal Expansion
  16
- Temperature-Pressure Relief Valve
  17
- Gas Piping
  18
- Supply Gas Regulator
  18
- Condensate Piping
  18
- High Altitude Installations
  19
- Filling the Water Heater
  19
- Venting
  20
- Installation of Vent System
  21
INSTALLATION Requirements - COMMONWEALTH of
22
Massachusetts
22
Direct Vent Diagram
30
- Vent Pipe Preparation
  31
- Controls and Switches
  33
  - Operating Instructions
    35
  - To Turn off Gas to Appliance
    35
Temperature Regulation
36
Control System Operation
37
- Overview
  37
- Control System Navigation
  37
  - Status Icons
    38
  - Operating States
    39
  - Control System Menus
    39
- User Settings & Control System Menus
  40
  - Heater Status
    41
  - Display Settings
    42
  - Heater Information
    42
  - Current Fault
    43
  - Fault History
    43
  - Fault Occurrence
    43
  - Service Contact Information
    44
For Your Information
45
- Start up Conditions
  45
- Operational Conditions
  45
Periodic Maintenance
46
- Venting System Inspection
  46
- Anode Rod Inspection
  46
- Temperature-Pressure Relief Valve Test
  46
- Draining and Flushing
  47
- Service
  47
Leakage Checkpoints
48
Troubleshooting
49
- Installation Checklist
  49
- Sequence of Operation Flow Chart
  50
- Operational Problems
  51
- Fault and Alert Conditions
  51
  - Resetting Control System Lock Outs
    52
  - Diagnostic Checks
    52
  - Fault and Alert Messages
    53
  - Ignition Failure
    53
  - Low Igniter Current
    53
  - Blower Prover Open
    54
  - Blocked Air Intake
    54
Important Information
55
Limited Residential Gas Warranty
55

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