Bell & Gossett HS 100D User Manual

INSTRUCTION MANUAL

HS-100

REVISION D

Hoffman Specialty

®

Steam Vents for Radiators
Model 1A and 1B
Air Valve (non vacuum)

1A
1/8" NPT
Connection

Maximum operating pressure 11⁄2 psig.
Maximum pressure 10 psig.

1B
1/4" NPT
Connection

Adjustable ports for

SLOW FAST

No1

2 1 6 54

A

B

proportional venting.

Venting Speed Port No. For

Fast 5 or 6 Radiation

located farthest
from the boiler
or areas that
are hard to
heat.

Medium 3 or 4 Normal venting

of radiation
under normal
conditions.

Slow 1 or 2 Radiation

located nearest
the boiler or
areas that
overheat.

Note: The air valve is factory set on port 6
for fast venting. To change the venting
speed follow “Port Adjustment” instructions.

Port Adjustment

• Port 1 provides the slowest venting.

• Port 6 provides the fastest venting.

To decrease
venting speed:

1. Loosen nut “A” on the

top of the air valve.

A

No1

SLOW FAST

2 1 6 54

2. Turn cap “B” to the left.

B

3. Hold cap “B” at the
desired setting and
tighten nut.

To increase
venting speed:

1. Loosen nut “A” on the

top of the air valve.

2. Turn cap “B” to the right.

3. Hold cap “B” at the
desired setting and
tighten nut “A”.

MAINTENANCE
INSPECT ANNUALLY: This vent allows air to

escape from the radiator as the steam pushes in.
A cold upper part of the radiator may indicate the
vent is plugged with scale or is malfunctioning.
Vapor or slight moisture from the vent is normal.
Steam continuously passing through the vent
indicates a malfunction. Replace the vent as
needed or every 10 years.

Xylem Inc.

8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: [phone]
Fax: [phone]
www.xyleminc.com/brands/bellgossett

Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem Inc. HS-100D October 2012 Part No. 512500