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: 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
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 bladder 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 bladder
(Fig. 2A).
2. Water begins to enter tank – air is compressed
above bladder 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 bladder (Fig. 2D).
5. Bladder completely empty – new cycle ready to
begin (Fig. 2A).
CHART II – Water Yield Per Pump Cycle
(drawdown) in Gallons
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
ATS6-2 2.2 1.8 1.6
ATS19-6 6.9 5.8 5.0
ATS35-11 12.7 10.7 9.3
ATS50-13 18.3 15.5 13.4
ATS62-18 21.4 18.3 16.0
ATS85-25 30.0 26.0 22.0
ATS119-35 41.3 35.4 31.0
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