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General Information
GENERAL INFORmATION
All tanks are factory pre-charged with air to 40
pounds per square inch (PSI) (2.8 Bar). When
installing tank, reduce pre-charge to 2 PSI (0.14
Bar) below pump cut-in pressure setting. To do this,
bleed air from valve on top of tank.
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 in PSI (Bar)
20-40 (1.4-2.8)
30-50 (2.1-3.5)
40-60 (2.8-4.2)
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
From
to tank waterlogging and water cell failure.
Well
Pre-charged storage tanks can be connected togeth-
er to increase the supply of usable water (draw-
Pressure Switch
down). Two tanks of the same size will double the
From
Well
Pressure Switch
Figure 1A
From
Well
Pressure Switch
Figure 1B
Tanks
Tank Precharge
in PSI (Bar)
18 (1.25)
28 (1.9)
38 (2.6)
A
Tanks
Tanks
Tanks
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).
To
Service
B
WATER
Figure 2
CHART II – Water Yield Per Pump Cycle
(drawdown) in Gallons (Liters)
To
Service
191 0893
model
MS6-2
MS19-6
MS35-11
MS50-13
MS62-18
MS85-25
MS119-35
To
Service
A
C
WATER
Pressure Switch Setting in PSI (Bar)
20-40
30-50
(1.4-2.8)
(2.1-3.5)
2.2 (8.3)
1.8 (6.8)
6.9 (26.1)
5.8 (22.0)
12.7 (48.1)
10.7 (40.5)
18.3 (69.3)
15.5 (58.7)
21.4 (81.0)
18.3 (69.3)
30.0 (113.6) 26.0 (98.4)
41.3 (156.3) 35.4 (134.0) 31.0 (117.3)
3
B
WATER
WATER
D
WATER
157 0893
40-60
(2.8-4.2)
1.6 (6.1)
5.0 (18.9)
9.3 (35.2)
13.4 (50.7)
16.0 (60.6)
22.0 (83.3)
C
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