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General Information
GENERAL INFORMATION
All tanks are factory pre-charged with air to 40
pounds per square inch (PSI). When installing tank,
reduce pre-charge to 2 PSI below pump cut-in pres-
sure 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
20-40 PSI
30-50 PSI
40-60 PSI
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
From
Well
Pressure
Switch
Figure 1A
Tanks
From
Well
Pressure
Switch
Figure 1B
Tank Precharge (PSI)
18
28
38
Tanks
To
Service
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 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).
A
Water
C
Figure 2
CHART II – Water Yield Per Pump Cycle
(drawdown) in U.S. Gallons
Model
502105
To
Service
Water
B
Water
D
Pressure Switch Setting (PSI)
20-40
30-50
4.8
4.1
3
612 1293A
40-60
3.6
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