Thrush Pressurizer-VS PB-VSI Series - Manual (Page 14)

4.4 Operation
The Pressurizer-VS was designed to accommodate your booster application needs.
Depending on the model, water pressure can be boosted from 30-80 psi with flow rates
up to 200 GPM. Figure 4-4 lists the various Pressurizer-VS models, factory settings and
their performance capabilities
Model
Maximum
Flow
(GPM)
Maximum
Boost
(PSI)
Factory
Discharge Set
Pressure (PSI)
*
Suction
Pressure (PSI)
Cut-Out
after Sleep
Boost
(PSI)
Wake Level
from Sleep
(PSI)
Tank
Pre-Charge
(PSI)
PB-VSI-60-30
60
30
60
30
65 58 50
PB-VSI-60-40 40 25
PB-VSI-60-60 60 25
PB-VSI-60-80 80 25
PB-VSI-100-30
100
30
60
30
65 58 50
PB-VSI-100-45 45 25
PB-VSI-100-65 65 25
PB-VSI-100-80 80 25
PB-VSI-200-35
200
35
60
25
65 58 50 PB-VSI-200-50 50 25
PB-VSI-200-60 60 25
*
This is field adjustable to fit specific duty points provided you stay within the capabilities of the pump.
Figure 4-4 Factory Settings & Performance Capabilities
4.5 Definition of Terms in Figure 4-4
Maximum Flow: The total amount of water that the specific Pressurizer-VS is capable of
pumping while maintaining the boost capabilities of the unit.
Maximum Boost: The amount of water pressure increase (boost) that the specific
Pressurizer-VS is capable of adding to of the suction pressure over the flow capabilities
of the unit. Suction Pressure + boost pressure = discharge (delivery) pressure. Maximum
boost can only be achieved if maximum flow is not exceeded.
Factory Discharge Set Pressure: The factory set point for the Pressurizer-VS.
Suction Pressure: The pressure supplied to the suction of the Pressurizer-VS during
factory setting of the Discharge Set Pressure. Site conditions with suction pressure other
than this will affect the sleep speed activation points and other settings of the VFD.
Cut-Out after Sleep Boost: The Pressurizer-VS incorporates a unique Sleep Boost
feature which will speed up the motor and adds additional pressure to fill the hydro-
pneumatic tank before going into sleep mode.
Wake Level from Sleep: The pressure in which the VFD starts the pump after sleep
mode.
Tank Pre-Charge: The pressure in the air side of the hydro-pneumatic tank with zero
pressure (no water in tank and connection is open to atmosphere) in the water side of
the tank. This pressure should be checked and corrected upon installation of the
Pressurizer-VS. If the operating conditions of the unit need to be adjusted in the
field, the pre-charge in the tank should be adjusted also. For optimal performance,
the pre-charge in the tank should be set to 10 PSIG below the Discharge Set
Pressure.
Thrush Co.
Manual #9636-1400
10