Bell & Gossett HS 902D User Manual
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.
Temperature
R
egulator
Hot Water
Converter
Y
Strainer
F & T
Trap
F & T
Trap
Y Strainer
Y Strainer
S
team
Supply
Cold
W
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
2
Tankless Water Heater
INSTALLATION COMPLETE
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