A.O. Smith Water Heater 520 Direct Vent Indoor Manuals

A.O. Smith Water Heater 520 Direct Vent Indoor Manuals

Manuals and User Guides for A.O. Smith Water Heater 520 Direct Vent Indoor. We have 1 A.O. Smith Water Heater 520 Direct Vent Indoor manual available for free PDF download: Service Manual

A.O. Smith Water Heater 520 Direct Vent Indoor Service Manual

A.O. Smith Water Heater 520 Direct Vent Indoor Service Manual (97 pages)

on-demand

Brand: A.O. Smith | Category: Water Heater | Size: 6 MB

Table of Contents

Table of Contents

2
Component Specifications

17
- Burners
  18
  - Gas Manifold
    19
  - Fan Motor
    20
  - Fan Motor for Exhaust
    21
  - Gas Valve Assembly
    22
  - Flame Rod
    23
  - AFR Rod
    24
  - Heat Exchanger
    25
  - Secondary Heat Exchanger
    26
- Flow Sensor
  27
- Water Control Valve
  28
- Thermistors
  30
- Exhaust Thermistor
  31
- Hi-Limit Switch
  32
- Hi-Limit Switch for Exhaust
  33
- Overheat Cutoff Fuse
  34
- Freeze Protection Heaters
  35
- Computer Board
  36
- Transformer
  37
- Igniter
  38
- Freeze Protection Thermostat
  39
- Surge Box
  40
- Fault Analysis & Specifications
  41
12. Controls and Settings

54

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