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Safety • Installation
Check pressure frequently with an accurate tire pressure
gauge until correct pressure has been reached. For
correct pre-charge pressure settings, see Table 1.
Pressure Switch Setting
kPa (psig)
140-280 (20-40)
210-350 (30-50)
280-420 (40-60)
Tanks
350-490 (50-70)
Table 1 - Air Cell Air Pressure Setting
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 air cell failure.
Pre-charged storage tanks can be connected together to
increase the supply of usable water (drawdown). Two
From
tanks of the same size will double the supply and three
Well
tanks will triple the supply. See Figures 1A and 1B for
Pressure Switch
typical installations of this kind.
From
Well
Pressure Switch
Figure 1A: Typical Layout With Two Tanks
Tanks
From
Well
Pressure Switch
Figure 1B: Typical Layout With Three Tanks
From
Well
Pressure Switch
Tank Precharge
kPa (psig)
126 (18)
196 (28)
265 (38)
335 (48)
To
Service
Tanks
To
Service
To
Service
Tanks
To
Service
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Operating Cycle
1. Tank nearly empty – air expands filling area inside
air cell (Figure 2A).
2. Water begins to enter tank – air is compressed in air
cell as tank fills with water (Figure 2B).
3. Pump-up cycle completed – air pressure has reached
the cut off setting of pressure switch (Figure 2C).
4. Water being drawn from tank – compressed air in air
cell forces water out of tank (Figure 2D).
5. Tank now empty – new cycle ready to begin
(Figure 2A).
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Figure 2: Air Cell Cycle
Air
Air
Figure 2A
Figure 2B
Air
Air
Figure 2C
Figure 2D
4
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