A.O. Smith 120 trough 500 Anleitung zur Verwendung

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

BTR HANDBOOK

TABLE OF CONTENTS

PAGE PAGE

Troubleshooting (continued)

Introduction 1-2 Troubleshooting the Efflkal 30-31

Wire Harness Test 32

Installation IID Module 33

Clearances 3-4 Pilot Spark 34

Air Requirements 5-9 Pilot Valve 35-36

Contaminated Air 10 Main Burner Test 37

Flammable 10 Flame Rectification 38

Gas Pressure 11 IID Module 39

Gas Valve 12 Main Gas Valve 40-41

Venting 13-15

Wiring Schematics

Natural and Propane Gas 42

Sequence of Operation

Mechanical 16 Service Charts 43

Electrical 17-18

General Questions & Answers 44

Troubleshooting

Transformer 19 Parts List 45-50

High Limit 20-21

Damper (on Standby) 22 Component Part Information 51

PC Board 22-23

Thermostat 24 Service Check List 52-53

Damper (call for heat) 25-26

Effikal Damper 27 Comments 54

Effikal Harness Test 28

Normal Operation 28-29

BTR WORKBOOK INTRODUCTION

This service handbook is designed to aid in servicing and troubleshooting A.O. Smith BTR water heaters in

the field. No duplication or reproduction of this book may be made without the express written authorization

of the A.O. Smith Water Products Company.

The following text and illustrations will provide you with a step by step procedure to verify proper installation,

operation, and troubleshooting procedures. Additional quick reference data is included to assist you in

servicing this product.

The information contained in this handbook is designed to answer common questions encountered in the

operation of the BTR product line and is not meant to be all inclusive. If you are experiencing a problem not

covered in this handbook, please contact the A.O. Smith Technical Information Department at 1-800-527-

1953 or your local A.O. Smith Water Products Company representative for further assistance. This

handbook is intended for use by licensed plumbing professionals and reference should be made to the

installation manual accompanying the product. This handbook contains supplemental information to the BTR

installation and operation manual.

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

Qualifications: Installation or service of this water heater requires ability equivalent to

that of a licensed tradesman in the field involved. Plumbing, air supply, venting, gas

supply and electrical testing skills are required.

Tools Required:

• Phillips head screwdriver

• standard screwdrivers

• a 3/8 and 7/16 inch open end wrench

• setofmarkeddrillbits

• an electrical multimeter tester capable of measuring continuity

• gas pressure gauge or manometer (gauge - AOS pt. no. 8099-2)

• water pressure gauge (AOS pt. no. 4798)

• thermometer (AOS pt no. 4870 - range 0 - 220 degree F)

• 1/2 inch socket with extension for removal of the clean out cover,

• 1 1/16 inch socket with extension for anode removal.

MISC: TC-043 Revision 1 vs. TC-043

Revision 1:

• Adds Additional model’s information.

• Adds cover statement this Handbook’s also a Service Handbook for many BTC Models.

• Includes Power vent kit information.

• Includes BTR/C-500 gas valve information.

• Updated Damper illustrations.

Revision2:

• Revised Part Numbers on Page 15

Revision 3:

• Adds information unique to the Efflkal damper equipped (Series 110, 111 and

Retrofit) models

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

INSTALLATION

This portion of the handbook will review some often overlooked installation

considerations, taking note of necessary installation requirements for the BTR 120

through 500 model heaters. The installation manual covers most of these items in detail.

Clearance to Combustibles Table

MODEL A B C

120 - 200 1” (2.54CM) 1” (2.54CM) 1” (2.54CM)

250 - 305 2” (5.08CM) 2” (5.08CM) 2” (5.08CM)

365 - 500 3” (7.75CM) 3” (7.75CM) 3” (7.75CM)

A 24 inch clearance for all serviceable parts is recommended. Clearances may vary

between BTR models – See instruction manual or the label on the heater, for clearances

applicable to your specific model.

CLEARANCES FROM COMBUSTIBLES

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

EXTERIOR CLEARANCE

This illustrates the exterior roof clearances for BTR units with natural draft venting. The

vent shall extend at least 3 feet above the highest point where it passes through a roof of

a building, and at least 2 feet higher than any portion of a building within a horizontal

distance of 10 feet (for vents of 12" in diameter or less). (NFPA 54 ANSI Z 223.1 SEC

7.5.2a). (Sec 7.6.2a may allow reduction to 8 feet with a “ Listed vent cap”).

"Copyright by the American Gas Association. Used by permission of the copyright holder".

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

AIR FOR COMBUSTION

10 CUBIC FEET OF AIR PER 1,000 BTU

Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1000

BTUH input of the gas input. The National Fuel Gas Code also recommends an

additional 2.5 cu.ft. of "excess" air. This 12.5 cu.ft minimum supply air per 1000 BTUH

input applies to natural and propane gas models.

The National Fuel Gas Code also specifies minimum make-up air opening sizes for

various building installations. (Ref: NFPA 54, ANSI Z223.1, sec 5.3)

2.5 CU.

FT.

EXCESS

AIR

10 CU.

FT.

COMB.

AIR

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

MAKE-UP AIR

DIRECT COMMUNICATION

A fresh supply of make-up air for combustion can be supplied to the heater through

make-up air ducts which directly communicate with the out of doors. Two openings are

required - one within 12 inches of the top of the enclosure and one within twelve inches of

the bottom of the enclosure. Each opening shall have a free area of not less than 1

square inch per 4000 BTUH of the total input of all appliances within the enclosure.

The lower opening is primarily providing combustion air. The upper opening is providing

vent dilution air and acts as a relief opening for flue gases should the vent become

obstructed or a downdraft condition occur. Additionally, when the heater is installed in a

confined space and communicating with the outdoor air, one permanent opening,

commencing within 12 in. (30 cm) of the top of the enclosure, shall be permitted where

the equipment has clearances of at least 1 in. (2.5 cm) from the sides and back and 6 in.

(16 cm) from the front of the appliance. The opening shall directly communicate with the

outdoors and shall communicate through a vertical or horizontal duct to the outdoors or

spaces (crawl or attic) that freely communicate with the outdoors, and shall have a

minimum free area of:

a. 1 sq. in. per 3000 BTU per hr (7 cm2per kW) of the total input of all equipment

located in the enclosure, and

b. Not less than the sum of the areas of all vent connectors in the confined space.

1 Square

Inch Per

4,000

BTUH

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

MAKE-UP AIR

VERTICAL DUCTS

Often it is more practical to install vertical make-up air ducts to the out doors. Again, two

openings are required - one within 12 inches of the top of the enclosure and one within

twelve inches of the bottom of the enclosure. Each opening shall have a free area of not

less than 1 square inch per 4000 BTUH of the total input of all appliances within the

enclosure.

1 Square

Inch Per

4,000

BTUH

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

MAKE-UP AIR

HORIZONTAL DUCTS

When the heater is installed in an interior room with no roof access for vertical ducts,

horizontal make-up air ducts should be installed. When using horizontal ducts, two

openings are required - one within 12 inches of the top of the enclosure and one within

twelve inches of the bottom of the enclosure. Each opening shall have a free area of not

less than 1 square inch per 2000 BTUH of the total input of all appliances within the

enclosure.

1 Square

Inch Per

2,000

BTUH

Dail

Schedule

BTR TANK TYPE HEATERS

SERVICE HANDBOOK

A.O. Smith Water Products Service Handbook

INSUFFICIENT MAKE-UP AIR

BACKDRAFT

Insufficient make-up air is a major cause of combustion problems. One common example

is in a restaurant installation where exhaust vent equipment was not considered in sizing

make-up air requirements. This may result in air being backdrafted by the restaurant

exhaust equipment through the heater causing flue gas spillage, flame roll out, improper

combustion, inconsistent pilot operation, and/or erratic heater shut down.

Dieses Handbuch passt für folgende Modelle

Inhaltsverzeichnis

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