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INSTRUCTION MANUAL
A07176C
Number 97
Automatic Air Vent
1/8" Male NPT Connection
Operational Limits
Max Temperature 240°F (116°C)
Max Pressure 150 psig (10 Bar)
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
SAFETY INSTRUCTION
This safety alert symbol will be used in this manual to draw attention to safety related
instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT!
YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN A SAFETY HAZARD.
DESCRIPTION
The No. 97 is a float type automatic air vent and is designed to vent the accumulation
of troublesome air whenever it can be trapped.
INSTALLATION INSTRUCTIONS
CAUTION: Uncontrolled venting of water can occur with the automatic air
vent if dirt, scale, pipe compound or other foreign material fouls the
operating mechanism. Keep vent cap closed during system filling to prevent dirt from
running into vent mechanism. Failure to follow these instructions could result in
property damage and/or moderate personal injury.
CAUTION: Hot venting can be hazardous. Avoid contact with venting fluid
and only manually vent when system temperature is below 100°F (38°C).
Failure to follow these instructions could result in property damage and/or personal
injury.
CAUTION: Overtightening and breakage can occur with the use of Teflon®*
pipe joint compounds. Teflon provides lubricity so that care must be
exercised not to over tighten joints. Failure to follow these instructions could result in
property damage and/or moderate personal injury.
*Teflon is a registered trademark of E.I. DuPont de Nemours and Company.
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1. Install the No. 97 automatic air vent in a hydronic piping system or in hydronic
system components where air is expected to accumulate and must be removed for
proper hydronic system operation.
2. The No. 97 air vent is a float type and must be installed in the vertical position with
the vent connection pointing up.
OPERATING INSTRUCTIONS
CAUTION: Uncontrolled venting of water can occur with the automatic air
vent if dirt, scale, pipe compound or other foreign material fouls the
operating mechanism. Keep vent cap closed during system filling to prevent dirt from
running into vent mechanism. Failure to follow these instructions could result in
property damage and/or moderate personal injury.
CAUTION: Hot venting can be hazardous. Avoid contact with venting fluid
and only manually vent when system temperature is below 100°F (38°C).
Failure to follow these instructions could result in property damage and/or personal
injury.
The No. 97 automatic air vent can be used for automatic or manual venting of hydronic
systems.
1. To manually operate, press down on the vent stem.
2. For normal automatic venting, open cap one full turn for a slow release of air. A fast
release of the air will allow dirt or scale to foul the vent mechanism. The small hole
in the side of the cap allows air to escape.
3. To shutoff automatic air vent, screw cap down tight.
SERVICE INSTRUCTIONS
There is no service required for the automatic air vent.
CAUTION: Corrosion or leakage of vents can cause damage or injury.
Periodically inspect the air vents for signs of leakage or corrosion. If noted,
the vent must be replaced. Failure to follow these instructions could result in property
damage and/or moderate personal injury.
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem Inc. A07176C May 2012
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