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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 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 cor-
rect pre-charge pressure settings, see Chart 1, below.
CHART I
Pressure Switch Setting
30-50 PSI
40-60 PSI
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 bladder 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
From
tanks will triple the supply. See Figures No. 1A and 1B
Well
for typical installations of this kind.
Pressure Switch
From
Well
Figure 1A
Tanks
From
Well
Pressure Switch
Figure 1B
Tank Precharge (PSI)
18
28
38
A
Tanks
To
Service
Pressure Switch
To
Service
Tanks
OPERATING CYCLE
1. Tank nearly empty - air expands filling area above
vinyl bladder (Figure 2A).
2. Water begins to enter tank - air is compressed above
bladder as it fills with water (Figure 2B).
3. Pump-up cycle completed - air now compressed to
cut off setting of pressure switch (Figure 2C).
4. Water being drawn from tank - compressed tank air
forces water out of bladder (Figure 2D).
5. Bladder completely empty - new cycle ready to begin
(Figure 2A).
B
To
Service
WATER
WATER
Figure 2
CHART II - Water Yield Per Pump Cycle
(drawdown) in Gallons
191 0893
SPS42H
SPS75T
SPS82T
SPS120
SPS200
SPS220
A
B
WATER
C
D
WATER
157 0893
Pressure Switch Setting (PSI)
20-40
30-50
2.2
1.8
2.2
1.8
4.8
4.1
6.9
5.8
6.9
5.8
6.9
5.8
11.6
9.8
12.7
10.7
18.3
15.5
21.4
18.3
30.0
26.0
3
C
WATER
40-60
1.6
1.6
3.6
5.0
5.0
5.0
8.5
9.3
13.4
16.0
22.0
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