AOSMITH dre-120 Manuals

Manuals and User Guides for AOSMITH dre-120. We have 1 AOSMITH dre-120 manual available for free PDF download: Service Handbook

A.O. Smith dre-120 Service Handbook

A.O. Smith dre-120 Service Handbook (76 pages)

commercial electric Water Heaters 100 SERIES

Brand: A.O. Smith | Category: Water Heater | Size: 4.37 MB

Table of Contents

Table of Contents
3
Introduction
4
- Qualifications
  4
- Service Warning
  4
- Tools Required
  5
Installation Considerations
6
Pre Service Checks
8
- Wiring Connections
  8
- Service Precautions
  8
Water Heater Construction
9
- Surface Mount Control Models
  10
- Electronic Control Models
  11
Operation & Service
12
- Principles of Electricity
  12
- Single and Three Phase Power
  14
  - Checking Single Phase Power
    15
  - Checking Three Phase Power
    16
- Phase Conversions - Surface Mount Control Models
  17
- Phase Conversions - Electronic Control Models
  18
- Fuses
  19
- Surface Mount Thermostats
  20
  - Thermostat & ECO Test
    21
- Heating Elements
  22
- Element Sensors
  29
  - Element Sensor Operation
    30
- Contactors
  31
- Transformers
  36
- Immersion Temperature Probes
  39
Electronic Controls
43
- CCB - Central Control Board
  44
- UIM - User Interface Module
  49
Electronic Control System
50
- Control System Features
  50
- Control System Navigation
  50
- The Desktop Screen
  51
  - Status Icons
    52
  - Operating States
    53
  - Control System Menus
    53
- Temperatures Menu
  54
  - Temperature Settings
    55
- Heater Status Menu
  56
- Economy Mode Setup Menu
  57
  - Setpoint Adjustment Value
    58
  - Time Clock Settings
    59
  - Daily Operating Mode Settings
    60
- Alarm Output Setup Menu
  61
- Display Settings Menu
  62
- Heater Information Menu
  63
- Current Fault/Alert Menu
  64
- Fault History Menu
  64
- Fault Occurrence Menu
  64
- Restore Factory Defaults Menu
  65
  - Factory Default User Settings
    65
Troubleshooting
66
- Common Service Problems
  66
- Surface Mount Control Models
  66
- Electronic Control Models
  67
  - Fault Conditions
    67
  - Alert Conditions
    67
  - Resetting the Control System
    67
- Control System Unresponsive
  67
  - UIM Display Is Blank
    67
  - UIM Is Inoperable
    68
  - Heating Cycle Disabled
    68
- Fault & Alert Messages
  69
  - No Current Detected
    69
  - Temp Probe Open
    70
  - Temp Probe Short
    70
  - Energy Cut out (ECO)
    71

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