General Information; Operating Cycle - Pentair STA-RITE PRO-Source Plus Owner's Manual

General Information

GENERAL INFORMATION
All tanks are factory pre-charged with air. When
installing tank, adjust pre-charge to 2 PSI below
pump cut-in pressure setting. To do this, bleed or
add air through valve on top of tank.
NOTICE: Transport and install tank in vertical
position ONLY!
NOTICE: Always set pre-charge with NO WATER
in tank.
Check pressure frequently with an accurate tire
pressure gauge until correct pressure has been
reached. For correct pre-charge pressure settings,
see Chart 1, below.
CHART I
Pressure Switch Setting Tank Pre-charge (PSI)
20-40 PSI
30-50 PSI
Tanks
40-60 PSI
Tank Pre-charge Settings for use with PENTEK
INTELLIDRIVE Variable Frequency Drives
Set the pressure tank's pre-charge to 70% of the
system operating pressure. When using an external
set point as well as an internal set point, pre-
charge the tank to 70% of the lower set point of
the two. Some applications may require a different
From
percentage when figuring the set point. Refer to
Well
your PENTEK INTELLIDRIVE operator's manual for
additional information.
Pressure Switch
From
Well
Pressure Switch
Figure 1A
Tanks
From
Well
Pressure Switch
Figure 1B
18
28
38
Tanks
A
To
Service
Tanks
NOTICE: Replace and tighten air valve cap if it is
re moved for any reason. Failure to replace air cap
may allow loss of air pressure and eventually lead
to tank waterlogging and water cell failure.
Pre-charged storage tanks can be connected
together to increase the amount of water available
per cycle (drawdown). Two tanks of the same size
will double the supply and three tanks will triple
the supply. See Figures No. 1A and 1B for typical
installations of this kind.

OPERATING CYCLE

1. Tank nearly empty – air expands filling area
above water cell (Fig. 2A).
2. Water begins to enter tank – air is compressed
above water cell as it fills with water (Fig. 2B).
3. Pump-up cycle completed – air now
compressed to cut off setting of pressure switch
(Fig. 2C).
4. Water being drawn from tank – compressed
tank air forces water out of water cell (Fig. 2D).
5. Water cell completely empty – new cycle ready
to begin (Fig. 2A).
To
Service
B
WATER
Figure 2
191 0893
CHART II – Water Yield Per Pump Cycle
(drawdown) in Gallons
Model
PSP19S-T02SA-25PSI
PSP19T-T02SA-25PSI
PSP35-T05SA-25PSI
To
PSP50-T50SA-25PSI
Service
PSP85-T52SA-25PSI
PSP119-T50SA-25PSI
A
WATER
C
WATER
Pressure Switch
Setting (PSI)
20-40
6.9
6.9
12.7
18.3
30.0
41.3
3
B
WATER
D
WATER
157 0893
30-50 40-60
5.8 5.0
5.8 5.0
10.7 9.3
15.5 13.4
26.0 22.0
35.4 31.0
C