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VAC-ALERT MODEL VA-2000L (Lift)
The Vac-Alert
TM
Model VA-2000L is a Safety Vacuum Release System (SVRS)
designed for
suction lift
applications. Suction lift in this case applies to all applications
where the circulating pump suction is no more than 24” below, or no more than 42”
above the level of the pool or spa water surface. This unit incorporates a 0.170” diameter
orifice opening installed below the surge tube section. This orifice opening is sized to
prevent nuisance tripping of the SVRS unit caused by high vacuum surges typical of
many pump start-up conditions.
The Model VA-2000L SVRS unit also utilizes a check valve assembly equipped with a
3.5 pound spring, a poppet disc and a one-way (up only) vented poppet. This check valve
assembly permits continued water flow to the circulating pump while the SVRS unit is in
the open or vented position. The 3.5 pound spring further compressed by the poppet disc,
creates enough sealing force within the check valve to allow partial water flow to the
circulating pump for suction lifts up to 42 inches. This is critical to the elimination of
circulating pump damage that can be caused by a sustained dry-running condition. The
one-way vented poppet allows the surge chamber to be internally recharged when the
circulating pump is turned off. This feature prevents nuisance tripping of the SVRS unit
on pools and spas that utilize a timer or air switch for circulation pump operation.
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VAC-ALERT MODEL VA-2000S (Submerged)
The Vac-Alert
TM
Model VA-2000S is a Safety Vacuum Release System (SVRS)
designed for
submerged suction
applications. Submerged suction in this case applies to
applications where the circulating pump suction is more than 24” below the level of the
pool water surface.
The Model VA-2000S is recommended on commercial pool
applications where the pump has a submerged suction of any depth and runs 24/7.
In submerged suction applications, for pumps 10 horsepower and greater, or for
pumps located 10 feet or more below the water line, a pump shut-off switch (Model
PSAC) is recommended.
The Model VA-2000S unit incorporates a 0.375” diameter
orifice opening installed below the surge tube section. This orifice opening is sized to
provide a limited amount of pump start-up surge protection, while at the same time
allowing enough air into the piping system to insure dissipation of the dynamic suction
force caused by the circulating pump.
The Model VA-2000S SVRS unit also utilizes a check valve assembly equipped with a
0.25 pound spring and a non-vented poppet (no poppet disc or hole through the poppet).
This check valve assembly utilizes a light duty spring to minimize the sealing force of the
check valve. The non-vented poppet insures that water from the circulating system,
under a positive hydrostatic head condition, does not migrate up into the SVRS unit.
NOTE:
The Model VA-2000 type is indicated on the outside of the box
and on the unit itself. Make sure you have the correct Model SVRS for
your application! SVRS in these instructions refers specifically to the
Vac-Alert
TM
Model VA-2000.
