General Information 3
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
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 supply of usable water
(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 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).
CHART II – Water Yield Per Pump Cycle
(drawdown) in U.S. Gallons
Pressure Switch Setting Tank Precharge (PSI)
20-40 PSI 18
30-50 PSI 28
40-60 PSI 38
Model
Pressure Switch Setting (PSI)
20-40 30-50 40-60
SSWM4, SWM4 4.8 4.1 3.6
SSWM6SQ
SWM6SQ
6.9 5.8 5.0
SSWM6, SWM6 6.9 5.8 5.0
SSWM9, SWM9 11.6 9.8 8.5
SSWM10SQ
SWM10SQ
12.7 10.7 9.3
SSWM14
SWM14
18.3 15.5 13.4
SSWM20
SWM20
21.4 18.3 16.0
SSWM25M
SWM25
30.0 26.0 22.0
SSWM35M
SWM35
41.3 35.4 31.0
From
Well
To
Service
Tanks
Pressure Switch
Figure 1A
From
Well
To
Tanks
Pressure Switch
Figure 1B
Figure 2
WATER
WATER
WATER
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