contents

SAFE INSTALLATION, USE AND SERVICE

2

Horizontal Installtion Requirements

17

GENERAL SAFETY

3

Direct Vent Installation Requirements

19

dimension and capacity data

4

INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF

capacity AND FLOW data

5

MASSACHUSETTS

19

contents

6

system installation

22

introduction

6

General

22

Grounding

Instructions

7

Hot Water Heating (Hydronic) Equipment

22

Inlet Water

Considerations

7

Internal Contaminants

23

Correct Gas

7

Hot Water Supply Boiler System - General Water Line Connections...

23

Precautions

7

Hard Water Conditions

23

Liquefied Petroleum Gas Models

7

Thermal Expansion (Closed System)

23

High Altitude Installations

7

Remote Probe Installation Procedure

23

Field Installed Components

7

Gas Connections

24

Control Components

8

Gas Supply Line Sizing

24

The Control System

8

Wiring

28

Hot Surface Igniter

8

Suggested Pipe Sizing Tables

29

Pressure Switches

8

Wiring Diagram

30

Low Gas Switch

8

VB/VW-500, 750 & 1000 SCHEMATIC DIAGRAM

32

Water Flow Switch

8

operation

33

Flame Sensor

8

Important

33

Water Temperature Limit Controls

9

General

33

ON/OFF Switch

9

Filling and Purging of Heating Boiler Installation

33

Circulating

Pump

9

Filling Hot Water Supply Boiler Installation

33

Temperature Probes

9

Purging Gas Line

33

Low Water

Cutoff (Optional)

9

Inlet Gas Pressure

33

Pressure Relief Valve

9

Water Temperature Regulation

34

GENERAL

10

LIGHTING & OPERATION INSTRUCTIONS

36

Required Ability

10

Adjustment

37

Location

10

Setting of the Test Mode

37

Panels and Covers

10

Control System

37

Chemical Vapor Corrosion

11

Inputs to MCB

38

Installtion Clearances

11

Operating Sequence

39

Leveling

11

UIM Operating Procedures

40

Air Requirements

11

Operating Setpoint Adjustment Procedure

41

Unconfined Space

11

High Limit Differential Setpoint Adjustment Procedure

42

Confined Space

11

TROUBLESHOOTING IGNITION SYSTEM

44

Fresh Air Openings for Confined Spaces

11

Troubleshooting Gas Valve

45

Outdoor Air Through Two Openings

12

Main Burner

45

Outdoor Air Through One Opening

12

preventative maintenance

45

Outdoor Air Through Two Horizontal Ducts

12

Relief Valve

46

Outdoor Air Through Two Vertical Ducts

12

Combustion Air Filter

46

Air From Other Indoor Spaces

13

Blower Compartment

46

Termination Clearances Sidewall Power Vent

14

Burner Maintenance

46

Termination Clearances Sidewall Direct Vent

15

Condensate Removal System

46

VENTING

16

Venting Maintenance

47

Special Installation Considerations

16

Heat Exchanger Preventative Maintenance

47

Venting System Using AL 29-4C®

16

Deliming

47

General Exhaust Vent Installation Procedure

16

Tube Cleaning Procedure Mechanical Removal of Deposits

47

Connecting Vent to Boiler

16

Replacement Parts

47

Venting Supports

17

notes

48

Vertical Installation Requirements

17

LIMITED WARRANTY

51

introduction

This design complies with the current edition of the ANSI Z21.13 low-pressure boiler standard.

Compliance under this standard implies that when the boiler underwent test, the gas manifold and control assembly pro­vided on the boiler met safe lighting and other performance criteria.

Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer a reference for the materials and methods of piping necessary. It is essential that all water, gas piping and wiring be installed as shown on the diagrams. You should thoroughly read and understand this manual before installation and/or operation of this boiler.

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

AL 29-4C®is a registered trademark of Allegheny Ludlum Corporation.

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 the absence of local codes, the installation must comply with the current editions, as follows:

In the United States:

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electric Code, NFPA 70.

6

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A.O. Smith VB/VW- 1000, VB/VW- 750 instruction manual Contents, Introduction

VB/VW- 1000, VB/VW- 750 specifications

A.O. Smith is a renowned name in the water heating industry, and their VB/VW-750 and VB/VW-1000 models reflect the cutting-edge advancements in both design and functionality. These commercial water heaters stand out due to their innovative features and robust characteristics, making them ideal solutions for various applications in commercial settings.

The VB/VW-750 and VB/VW-1000 models are designed with high efficiency in mind. They utilize advanced heat transfer technology that maximizes energy use, translating to significant savings on utility bills. These units are engineered to deliver consistent hot water supply, essential for businesses such as restaurants, hotels, and manufacturing facilities where extensive hot water demands are necessary.

One of the standout features of the VB/VW models is their high recovery rate. This means they can produce a large volume of hot water within a short period, catering to peak demand times without compromising performance. Additionally, the units come equipped with a durable tank made from high-quality materials to resist corrosion, which ensures a long lifespan and reliability in service.

The VB/VW-750 and VB/VW-1000 are also equipped with advanced control systems. These systems provide precise temperature regulation, improving safety and energy efficiency. The smart pumping system further enhances performance by optimizing water flow and reducing energy consumption during operation.

Maintenance and serviceability are key characteristics of these models. They feature easy access to critical components, allowing for quick inspections and repairs. This design consideration minimizes downtime, which is crucial for any business reliant on continuous hot water supply.

Both models are compliant with various industry standards, including energy efficiency regulations. A.O. Smith has focused on ensuring these water heaters not only meet but exceed these requirements, contributing to sustainability efforts.

In summary, the A.O. Smith VB/VW-750 and VB/VW-1000 models combine efficiency, reliability, and ease of maintenance. Their advanced features and cutting-edge technologies make them a top choice for commercial hot water applications, positioning A.O. Smith as a leader in the water heating industry. With their strong performance and durability, these models are designed to meet the demands of modern businesses while providing peace of mind regarding hot water availability.