IS-150A
Installation Instructions
Series LF150A/LF150-HA
Water Hammer Arrestor for Residential Applications
Installation Instructions
• Install as close as possible to source of shock.
• Avoid damaging arrestor by using hex flats to tighten.
• Unit is factory pre-charged to 30psi (207 kPa). If system pressure is
higher than 35psi (241 kPa), add air until the valve is 5psi (34 kPa)
below the system flow pressure.
• Use LF150HA hose adapter for hose applications such as direct
mounting to Watts Model 2, Duo-Cloz washing machine shutoff valve.
• Maximum working pressure 150psi (10.3 kPa).
LF150A
LF150A
LF150HA
4
13
⁄
32
4
5
⁄
16
1
1
⁄
4
2
1
⁄
4
How It Operates
Dimensions
1. When water in the
house is not being
used, the LF150A is
in its normal state,
where the air charge
and water pressure
do not flex the
diaphragm.
2. When the water is
being used, the
LF150A is still in
balance of air
pressure and water
pressure, the
diaphragm does
not flex.
3. When water is quickly
shut off, the sud-
den halt causes the
water pressure to
soar and the shock
is absorbed by the
diaphragm.
Followed by a sud-
den drop, which
also acts on the
diaphragm, flexing it
silently to handle the
pressure changes.
4. Seconds after the
shock, the diaphragm
is back in its normal
stage.
Annual inspection of all water system safety and control valves is
required and necessary. Regular inspection, testing and cleaning
assures maximum life and proper product function.
Quick-Closing Faucets
Model LF150A
Model LF150A
Watts Model 2
Model LF150A-HA
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can result in death,
serious personal injury, property damage, or damage to the equipment.
Keep this Manual for future reference.
Clothes and Dishwashers
NOTICE
