Bell & Gossett HS 902D User Manual

Download

Page 1

INSTRUCTION MANUAL

HS-902

REVISION D

Hoffman Specialty Model 62 Vacuum Breaker

CAUTION

• Before using this product read and understand instructions.

• Save these instructions for future reference.

• Turn off steam or water before servicing.

• To prevent serious burns, wear heat resistant gloves when handling hot equipment.

Failure to follow this caution could result in property damage or personal injury.

OPERATION

As system pressure falls sufficiently below atmospheric pressure to

compress the spring, the vacuum breaker will open, allowing air to enter the system. The vacuum breaker is factory set to open at approximately 2 inches Hg vacuum. It is adjustable from 1/4” to 20” (8 - 508 mm) Hg vacuum.

Page 2

Temperature 

egulator

Hot Water Converter

Y

Strainer

F & T

Trap

F & T

Trap

Y Strainer

team

Supply

Cold

ater Supply

Drain

Vacuum Breaker

Thermo

Bulb

Storage Tank Water Heater

F & T

Trap

Temperature

Regulator

Y

Strainer

Vacuum Breaker



Temperature

Regulator

Vacuum 

Breaker

Tankless

Water Heater

Y

Strainer

F & T

Trap

INSTALLATION –

STEP 1 - Determine Where to Install the Vacuum Breaker

TYPICAL PIPING DIAGRAMS

The Model 62 vacuum breaker can be installed vertically or horizontally. However, installing the vacuum breaker horizontally results in fouling of the seating surface, which prevents tight sealing. The life of the o-ring may be increased by installing the vacuum breaker in a standpipe where temperatures are lower.

Adjusting the Set Point

To increase the vacuum breaker set point, increase the spring tension. To decrease the vacuum breaker set point, decrease the spring tension.

Hot Water Converter

Storage Tank Water Heater

Tankless Water Heater

INSTALLATION COMPLETE

Page 3

MAINTENANCE

SCHEDULE:

Initially and every 6 months thereafter.

•

• Replace vacuum breaker every 15 years. More frequent replacement of the vacuum breaker is required when used on water systems in locales where significant water treatment is required, or where more frequent cleaning is necessary.

PROCEDURE:

CAUTION

• Turn off steam or water before servicing acuum breaker.

• To prevent serious burns, wear heat resistant

gloves when handling hot equipment.

Failure to follow this caution could cause personal injury.

1. Inspect for leaks. Stop all leaks by tightening or

replacing O-Ring, as necessary.

O-Ring Replacement (Part Number 601313)

1. Make sure the steam, air or water supply is turned off and pressure is relieved. On steam systems, allow unit sufficient time to cool.

2. Remove complete vacuum breaker from system.

3. Pull cover (A) from base (B), this is a snap in place cover that can be removed by hand.

4. Measure and note distance from end of stem (C) to top locknut (D). Remove locknuts (D) and (G), spring (E), and stem (C) from base (B).

5. Remove O-Ring (F) from stem (C) and discard. Clean all parts, apply silicone lubricant to new O-Ring and push into the shoulder of the stem, Make sure the O-Ring is flat with the end of the stem.

6. Reassemble all parts. Tighten locknuts (D) and (G) to the same distance as measured in step 4 (above). Push on the stem several times to make sure it is free to move in its guide and snap cover in place on base.

7. Reinstall on system and check for leaks.

Page 4

Xylem

1) The tissue in plants that brings water upward from the roots;

2) a leading global water technology company.

We’re 12,500 people uniﬁed in a common purpose: creating innovative solutions to meet our world’s water needs. Developing new technologies that will improve the way water is used, conserved, and re-used in the future is central to our work. We move, treat, analyze, and return water to the environment, and we help people use water efﬁciently, in their homes, buildings, factories and farms. In more than 150 countries, we have strong, long-standing relationships with customers who know us for our powerful combination of leading product brands and applications expertise, backed by a legacy of innovation.

For more information on how Xylem can help you, go to www.xyleminc.com

Xylem Inc.

8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xyleminc.com/brands/bellgossett