Pentair STA-RITE PRESSOMAT PMS20 PVM 3-5 Instructions De Service page 24

CHAP. 3 HYDRAULIC INSTALLATION
Fig.1 shows the assembly diagrams normally used.
In the case where the pressurization group is fed by a tank, avoid any unpriming phenomena; we recommend to
control the following characteristic data:
- Static level (initial level of the well)
- Dynamic level (level reached during the group operation)
- Flow rate
To reduce losses during replenishment it is necessary to install the group as close as possible to the pumping
point and to install a suction pipe with a minor number of curvatures that should have a sufficiently wide radius.
Even the diameter of the pipe should be calculated so as to reduce load losses, what requires dimensions
greater than or equal to those of the pump aspiration inlet.
In order to avoid the formation of air locks into the suction pipes, these ones must have a positive gradient, from
bottom to top, avoiding countergradients or "goosenecks", and there must not any air infiltration in the
connections.
Connect the delivery collector to the distribution collector by interposing vibration-damping joint.
This connection can be done either on the right side or on the left side of the collector by displacing the blind
flange or the threaded cover.
WARNINGS
In the case where there would not be any pumping in close proximity from the group, on the discharge line, the
installation of a test faucet is recommended.
It is necessary to control from time to time the pre - replenishment pressure of membrane vessel that must be
0.2 bar lower than the minimum closing pressure of the pressure switch calibrated lower.
This control must be done without pressure in the installation or with the tanks disassembled.
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DANGER
Risck of electrical
discharge
It is a good rule to foresee the evacuation of water losses in case of
bad seal of joints, mechanical seal, tanks overflowing. etc....
All the assembly operations must be carried out with
group disconnected from the power grid.