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.