Thrush Pressurizer-VS PB-VSI Series - Manual (Page 8)

3.1.1 TV2g Pump
The TV2g series pump utilized on the Pressurizer-VS is
designed to mount in-line to reduce the overall footprint of the
system. The top pull out feature allows maintenance of the
pump mechanical seal without disturbing the piping.
3.1.2 Hydro-Pneumatic Tank
The hydro-pneumatic tank is a pre-pressurized tank that
enables the system to react instantaneously upon demand. It
also prevents the pump from short cycling from small
infrequent demands, this feature is called “Sleep Boost”. An
optional ASME Code tank is also available.
3.1.3 Pressure Transmitter
The pressure transmitter measures pressure at the discharge
side of the system. When pressure on the discharge side of
the system reaches the set-point, the pressure transmitter
sends a signal to shut the pump off. The pump will not turn
back on until the discharge pressure of the system drops
below the set-point.
3.1.4 VFD (Variable Frequency Drive)
The VFD regulates the motor and provides a constant output
pressure, regardless of fluctuating supply pressure or
changing flow demand. The VFD allows for a narrower
pressure deadband
(the amount of pressure that must be
removed before the pressure switch contacts reset after
actuation level has been reached) which insures a constant
pressure supply at fixtures.
3.1.5 Low Suction Switch
The low suction switch acts as a safeguard for the pump. If
suction pressure is below the factory set-point, the low suction
switch will prevent the pump from turning on and potentially
causing damage.
3.1.6 Inline Check Valve
The inline check valve is located at the pump discharge to
prevent possible damage to the pump from water backflow
and back pressure. This compact design reduces the overall
footprint of the Pressurizer-VS.
Thrush Co.
Manual #9636-1400
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