American Water Heater 520 Installation Manual

520 Direct Vent Indoor and Outdoor Models On-Demand Condensing Water Heater Installation Manual and Owner’s Guide

Installation 10│Page Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury

Installation 11│Page Excludes elbow termination, rain caps, or the 3” PVC Concentric Termination For details on the vent connection to the 520 Indoor

Installation 12│Page Improper installation can cause nausea or asphyxiation, severe injury or death from carbon monoxide and flue gases poisoning. Im

Installation 13│Page 1. Connect the PVC adaptor* directly on the exhaust vent collar of the water heater. 2. Connect a 4” PVC coupler (or 4x3” PVC re

Installation 14│Page 1. Connect a 4” PVC Straight pipe directly on the intake vent collar of the water heater. 2. Connect a 4x3” PVC reducer to the 4

Installation 15│Page -Vent clearances- Canada U.S.A Direct vent and other than Direct Vent Direct vent Other than Direct

Installation 16│Page -Additional clearances - Please follow all local and national codes in regards to proper termination clearances. In the absence

Installation 17│Page 1. Turn off all electric power to the water heater if service is to be performed. 2. Turn the manual gas valve located on th

Installation 18│Page Size the gas pipe appropriately to supply the necessary volume of gas required for the 520 Indoor and Outdoor models (199,000 BTU

Installation 19│Page Do not use this water heater if any part has been submersed under water. Immediately call a licensed professional to inspect t

Contents 2│Page CONTENTS SPECIFICATIONS 520 Indoor and Outdoor Natural Gas Input (Operating Range) Min: 13,000 Btu/h Max: 199,000 Btu/

Installation 20│Page PRESSURE RELIEF VALVE The 520 has a high-temperature shut off switch built in as a standard safety feature (called a Hi-L

Installation 21│Page -Condensate Drain Connections- The 520 models are high efficiency condensing water heaters that produce condensate (acidic

Installation 22│Page  The condensate drain is at atmospheric pressure (non-pressurized) and therefore must be allowed to drain freely

Installation 23│Page Follow the electrical code requirements of the local authority having jurisdiction. In the absence of such requirements, follow t

Installation 24│Page REMOTE CONTROLLER CONNECTION 1. Disconnect power supply from the water heater. 2. Take off the water heater’s fro

Installation 25│Page In an Easy-Link system, the pump must be connected to the “Pump connector” in the “PARENT unit” only. If the pump is connected t

Installation 26│Page PUMP CONTROL MODES The 520 provides the four types of the pump control modes. The pump control modes are selected by changing

Installation 27│Page D) Normal Control (Default setting): No.5 and No.6 OFF Feature: This mode provides no special pump control. Pump activation can

Installation 28│Page  The Easy-Link system is limited up to 4 units. If you connect more than 4 units, only the first 4 units will work as a part of

Installation 29│Page The dark squares indicate the direction the dipswitches should be set to. 4. Between the “PARENT” and the “CHILD-1” units Connect

Introduction 3│Page INTRODUCTION *This diagram illustrates tankless water heater design concepts o

Installation 30│Page CASE 1:  Unless you change dipswitch No.10 of the “PARENT” unit to the “ON” position, the system will not work as an Easy-Lin

Installation 31│Page Connecting two “PARENT connectors” together from two separate units may damage the computer board. The communication cable has

Applications 32│Page  In order to purge air in water pipes within a closed-loop system, an air vent and air separator should be installed in t

Applications 33│Page -Dual-purpose hot water heating- (Domestic and Space Heating): * The circulation pump is to provide no less

Initial Operation 34│Page  Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time.  Open the main gas supply valve

Operating Safety 35│Page OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or e

Operating Safety 36│Page DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store fla

Normal Operation 37│Page  The 520 will display the set temperature on the 3-digit 7-Seg. LED on the computer board. This LED is visible through

Normal Operation 38│Page DO NOT set to 185 °F if you use your 520 water heater in a recirculation system. This will cause damage to the heater and

Normal Operation 39│Page Only pipes within the water heater are protected by the freeze protection system. Any water pipes (hot or cold) located out

Safety Guidelines 4│Page   Water temperatures over 125°F (52°C) can cause severe burns instantly or death from scalding. The water temperature is

Normal Operation 40│Page Turn off the electrical power supply and close the manual gas control valve and the manual water control valve before servic

Troubleshooting 41│Page GENERAL TROUBLESHOOTING PROBLEM SOLUTIONS It takes long time to get hot water at the fixtures.  The time it takes to de

Troubleshooting 42│Page PROBLEM SOLUTIONS Unit does not ignite when water goes through the unit.  Is the flow rate over 0.5 GPM? (p. 37)  C

Troubleshooting 43│Page ERROR CODES  The 520 units are self diagnostic for safety and convenience when trouble shooting.  If there is a problem

Troubleshooting 44│Page -FAULT ANALYSIS OF ERROR CODES- If there is a problem with the installation of the 520, it will display a numerical error

Components Diagram 45│Page COMPONENTS DIAGRAM Case assembly Other than the case assembly (No.15) and front cover (No.16), all of the 520 Outdoor part

Components Diagram 46│Page Burner assembly The 520 Indoor and Outdoor share the same compon

Components Diagram 47│Page A40140240 340440 740 840941041 141241341 441541 641741841942041442142242342 442542 841 442941443643043243341 943443543844

Parts List 48│Page PARTS LIST Item# Part# Description Item# Part# Description 001 319143-009 Case assembly for 520 Indoor 002 319143-010 Front co

Parts List 49│Page Item# Part# Description Item# Part# Description 412 319143-075 O-ring JASO# 1016 FKM 450 319143-112 Fastener “6-15” 413 319143

Installation 5│Page  Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter

Output Temperature Chart - 50 -│Page OUTPUT TEMPERATURE CHART Output Temperature vs. GPM (Max. 9.0 GPM) with Various Ground Water TemperatureChart is

Warranty - 51 -│Page LIMITED WARRANTY 1. General terms of limited warranty: This limited warranty gives you specific legal rights, and you may also

Warranty - 52 -│Page 3. Repair, Replacement or Refund: The manufacturer or its authorized Service Representative will, at its sole discreti

Installation 6│Page GENERAL 1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the National Fue

Installation 7│Page OPTIONAL ITEMS 1. Temperature Remote Controller: 9007603005 The Temperature Remote Controller has two functions. It allow

Installation 8│Page WARNING FOR INSTALLATIONS FOR YOUR SAFETY, READ BEFORE INSTALLATION: Do not install the heater where water, debris or flammabl

Installation 9│Page The dark squares indicate the direction the dipswitches should be set to. Left bank of dipswitches Left bank of dipswitches  T