Bosch 520-HN -L Manuals

Table of Contents

• • 2

    Table of Contents

• 3

  1 Key to Symbols and Safety Instructions

  • 3

    Key to Symbols
  • 3

    General Safety Instructions

• 6

  2 Warning

• 7

  3 Appliance Details

  • 7

    520 HN Specifications (Technical Data)
  • 8

    Unpacking the 520 HN Heater
  • 8

    General Rules to Follow for Safe Operation
  • 10

    Dimensions and Installation Clearances

• 11

  4 Installation Instructions

  • 11

    Introduction
  • 11

    Proper Location for Installing Your Heater
  • 11

    Mounting Heater
  • 13

    Combustion Air Requirements
  • 13

    Venting
  • 14

    1Horizontal Venting
  • 14

    2Vertical Venting
  • 16

    Gas Piping & Connections
  • 20

    Measuring Gas Pressure
  • 20

    Water Connections
  • 21

    Recirculation Application

• 21

  5 Operation Instructions

  • 21

    For Your Safety Read before Operating
    • 21

      Your Water Heater
  • 21

    Lighting Instructions
  • 22

    To Turn Off Appliance
  • 22

    Adjusting the Water Temperature
  • 23

    Power Adjustment Knob
  • 23

    Draining the Appliance

• 24

  6 Maintenance and Service

  • 24

    Maintenance Intervals
  • 24

    Water Valve
  • 25

    Pilot
  • 25

    Main Burners
  • 25

    Vent Assembly / Heat Exchanger
  • 25

    Mineral Scale Build-Up
  • 25

    1Descaling Heat Exchanger

• 26

  7 Troubleshooting

  • 26

    Introduction
  • 26

    No Spark at Pilot with Water Flow
  • 26

    Spark Appears When Hot Water Is Turned On, but Pilot and Burners Will Not Ignite
  • 27

    Pilot Lights, but Burners Will Not Come On
  • 28

    Main Burners Go Out During Hot Water Use
  • 28

    Hot Water Temperature Fluctuates at Tap
  • 29

    Water Is Too Hot
  • 29

    Water Is Not Hot Enough
  • 29

    Burners Ignite Without Hot Water Flow
  • 29

    7.10 Low Hot Water Pressure
  • 30

    7.11 Noise When Heater Is Running
  • 30

    Burners Do Not Operate Cleanly; Yellow Flames When Operating

• 30

  8 Protecting the Environment

• 31

  9 Interior Components and Diagram Parts List

  • 31

    Interior Components
  • 32

    Components Diagram
  • 33

    Parts List

• 34

  10 Lifetime Limited Warranty for Bosch Tankless Water Heaters

• 35

  11 Installer Checklist To Be Completed By Installer Upon

  • 35

    Installation