A.O. Smith 160M, 225M, 200M, HW-120M warranty Foreword, Table of Contents, General Safety Information

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FOREWORD

This design complies with the latest edition of the ANSI Standard Z21.10.3 for gas water heaters Vol. III Storage Water Heaters with input ratings above 75,000 BTU per hour Circulating and Instantaneous.

Detailed installation diagrams are in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping suggested. IT IS ESSENTIAL THAT ALL WATER AND GAS PIPING AND THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS.

You should thoroughly read and understand this manual before installation and operation of this unit.

CHECK THE DIAGRAMS THOROUGHLY BEFORE STARTING INSTALLATION TO AVOID POSSIBLE ERRORS AND TO MINIMIZE TIME AND MATERIALS COST.

Particular attention should be given to the installation of thermometers at the locations indicated in the diagrams as these are necessary for checking the operation of the heater.

MAKE SURE THE GAS ON WHICH THE HEATER WILL OPERATE IS THE SAME AS THAT SPECIFIED ON THE HEATER MODEL AND RATING PLATE.

The factory warranty will be void if the unit(s) have been improperly installed or operated.

In addition to these instructions, the boiler(s) shall be installed in accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction should be consulted before installations are made.

In absence of local codes, the installation must comply with the latest editions.

In the United States:

The National Fuel Gas Code, ANSI Z223.1 and the National Electric Code, NFPA 70.

In Canada:

The Installation Code CAN/CGA B149.1 and .2 (latest edition) and the Canadian Electric Code, CSA C22.1.

These are available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131, USA, or, Canadian Gas Association Laboratories, 55 Scarsdale Road, Don Mills, Ontario M3B 2R3, Canada.

TABLE OF CONTENTS

 

PAGE

 

PAGE

ROUGH-IN DIMENSIONS

2

PIPING DIAGRAMS

11-13

FOREWORD

3

Gas Connections

14-15

GENERAL SAFETY INFORMATION

3

Electrical Information

15-16

Precautions

3-4

OPERATION

17

Grounding Instructions

4

Important

17

Chemical Vapor Corrosion

4

General

17

Liquid Petroleum Models

4

Filling

17

High Altitude Installations

4

Purging Of Gas Line

17

FEATURES

5

Operating Instructions For I.I.D Models

18

Automatic Gas Shutoff Control

5

Checking And Adjusting The Input

19

Protector Switch (Coil High Limit)

5

SERVICE INFORMATION

20

Thermal Balancer

5

Pilot And Main Burner Maintenance

20

Intermittent Ignition Control Module

5-6

I.I.D. Pilot Burner

20-21

Circulating Pump

6

Protector Switch (Coil High Limit-All Heaters)

21

Tank Temperature Control (Not Supplied)

6

Tank Temperature Control

21

Safety Flow Switch (Not Supplied)

6-7

Automatic Gas Shutoff Control

21

Drain Valve (Not Supplied)

7

Thermal Balancer

21

Thermometers (Not Supplied)

7

Inspecting The Heat Exchanger And Venting System

21-22

INSTALLATION INSTRUCTIONS

8

Gas Pressure Regulator

22

Important

8

Relief Valve

22

Required Ability

8

Circulating Pump

22

Location

8

Electrical Service

22

Installation Clearances

8

Replacement Parts

22

Levelling

8

PREVENTIVE MAINTENANCE

22

Air Requirements

8-9

Recommended Procedure For Periodic Removal Of Lime

 

Venting

9

Deposits From Coil Type Commercial Water Heaters

22-23

Relief Valve

9-10

Deliming Solvents

23

Hard Water

10

Removing Light Deposits

23

Closed Water System

10

Heavy Lime Deposits

23-24

Water Line Connections

10

CHECKOUT

24-27

Water (Potable) Heating

10

LIMITED WARRANTY

28

GENERAL SAFETY INFORMATION

PRECAUTIONS

If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified serviceman:

1.FLOODING TO LEVEL OF BURNER OR CONTROLS OR HIGHER.

2.EXPOSURE TO FIRE.

3.IF DAMAGED.

4.FIRING WITHOUT WATER.

5.SOOTING.

KEEP THE HEATER AREA CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS. AREAAROUND HEATER MUST NOT CONTAIN OBSTRUCTING MATERIAL TO THE FLOW OF COMBUSTION AND VENTILATING AIR.

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Contents Commercial GAS Copper Heat Exchanger Water Heater Models HW-120M, 160M, 200M, 225MHeater Performance Data ROUGH-IN-DIMENSIONSTable of Contents General Safety InformationForeword Liquid Petroleum Models High Altitude InstallationsGrounding Instructions Chemical Vapor CorrosionIntermittent Ignition Control Module FeaturesAutomatic GAS Shutoff Control Thermal BalancerIntermittent Ignition Control Module I.I.D Tank Temperature ControlSafety Flow Switch Circulating PumpDrain Valve Not Supplied Safety Flow Switch SettingsInstallation Instructions Confined Space Proper Vent Pipe InstallationVenting Relief ValveWater Potable Heating Hard WaterClosed Water System Water Line ConnectionsPiping Diagrams Page Page GAS Supply Pipe Sizes in Inches GAS ConnectionsCorrect GAS Sizing GAS Supply LineElectrical Information Page Purging of GAS Line OperationGeneral FillingOperating Instructions for I.I.D. Models For Your Safety Read Before OperatingOver 170F 77C Checking and Adjusting the InputMain Burner for HW Heaters Service InformationPilot and Main Burner Maintenance D. Pilot BurnerInspecting the Heat Exchanger Venting System Protector SwitchProtector Switch Continuity Test Thermal Balancer Schematic DiagramGAS Pressure Regulator Preventive MaintenanceElectrical Service Replacement PartsDeliming the HW Water Heater Deliming SolventsRemoving Light Deposits Heavy Lime DepositsCheckout Removing SilicateSystem Operation YES No Spark AT Pilot BurnerReplace pilot burner Replace ignition Module Spark AT Pilot Burner but Pilot will not LightMV & MV/PV? Pilot Burner Lights but Main Burner does not LightLimitations on Implied Warranties Service and Repair ExpensesClaim Procedure Conditions and Exceptions

HW-120M, 225M, 200M, 160M specifications

A.O. Smith is renowned for its range of advanced water heaters, and the 160M, 200M, 225M, and HW-120M models stand out as some of the most reliable and innovative options available. These water heaters are designed to deliver exceptional performance, energy efficiency, and user-friendly features, making them ideal for various residential and commercial applications.

The A.O. Smith 160M model boasts a robust design that ensures longevity and efficiency. It has a 160-gallon capacity, providing ample hot water for households with high demand. This model incorporates insulation technology that minimizes heat loss, contributing to energy savings and reduced utility bills. Additionally, it features a durable exterior that is resistant to rust and corrosion.

The 200M model takes performance a step further with a higher capacity of 200 gallons, making it suitable for larger homes or businesses. This model is equipped with advanced components, including a high-efficiency burner and a powerful thermocouple that ensures reliable heating. The 200M also includes user-friendly controls that allow for precise temperature settings and easy operation.

Next in line is the A.O. Smith 225M, which offers an impressive 225-gallon capacity. This model is designed for heavy-duty usage and features a reinforced tank to withstand high pressure. The 225M is also equipped with state-of-the-art flame retention technology that optimizes fuel use, enhancing the overall efficiency of the unit. This ensures that customers not only get hot water when needed but also experience considerable savings on energy costs.

Finally, the HW-120M model is a compact solution that does not compromise on performance. With a capacity of 120 gallons, it is ideal for smaller households or spaces where water heating needs are moderate. The HW-120M includes features such as an LED display for easy temperature monitoring and an integrated safety system that prevents overheating.

All these models utilize advanced technologies such as electronic ignition and enhanced insulation materials, contributing to a reduction in energy consumption and maintenance needs. The combination of these features makes A.O. Smith appliances a smart choice for consumers looking for efficiency, reliability, and performance. With a strong commitment to craftsmanship and innovation, A.O. Smith continues to set the standard in water heater technology, ensuring customers enjoy reliable hot water access while promoting energy efficiency.