General Information
3
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 posi
tion 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
Tank Precharge 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 percent
age when figuring the set point. Refer to your
PENTEK INTELLIDRIVE operator’s manual for
additional information.
NOTICE:
Replace and tighten air valve cap if it is
removed 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 togeth
er to increase the supply of usable water (draw
down). 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 vinyl 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 com
pressed 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).
Pressure Switch Setting
Tank Precharge (PSI)
20 40 PSI
18
30 50 PSI
28
40 60 PSI
38
Pressure Switch Setting (PSI)
Model
20-40
30-50
40-60
PSP19S T02
6.9
5.8
5.0
PSP19T T02
6.9
5.8
5.0
PSP32 T03
11.6
9.8
8.5
PSP35 T05
12.7
10.7
9.3
PSP50 T50
18.3
15.5
13.4
PSP62 T51
21.4
18.3
16.0
PSP85 T52
30.0
26.0
22.0
PSP119 TR50
41.3
35.4
31.0
From
W
ell
To
Ser
v
ice
Tanks
Pressure Switch
From
W
ell
To
Ser
v
ice
Tanks
Pressure Switch
Figure 1A
Figure 1B
Figure 2
WATER
A
B
WATER
WATER
C
D
CHART II – Water Yield Per Pump Cycle
(drawdown) in Gallons