Installation 4
General Information
Tanks listed below are pre-charged, or filled with
air at the factory, to 40 pounds per square inch
(PSI) (276kPa). When installing tank, set tank
pressure according to Chart 1. To do this, bleed
air from or add air to tank through valve on top
of tank.
NOTICE Always set or check tank pre-charge
with NO WATER in tank or water pressure
in system. If you have already pumped water
before setting or checking pre-charge pressure,
turn pump off. Open faucet until there is no
more water pressure. Set pre-charge in tank
according to Chart 1, then close faucet and turn
pump back on.
NOTICE Replace and tighten air valve cap after
pressure is adjusted correctly. Failure to replace
air cap may allow loss of air pressure and lead
to tank waterlogging and bladder failure.
When Pressure Switch
Setting Is:
Reduce Tank Precharge
(PSI) To:
20-40 PSI (138-276 kPa) 18 (124 kPa)
30-50 PSI (207-345 kPa) 28 (193 kPa)
40-60 PSI (276-414 kPa) 38 (262 kPa)
Chart I - Tank Precharge Settings
(The first number on the pressure switch is the
pump ‘ON’ setting; the second number is the
pump ‘OFF’ setting.)
Pre-charged storage tanks can be connected
together to increase the drawdown. Drawdown
is the actual amount of usable water available
from when the tank is full to when the pump
turns on. Installing two tanks of same size will
double the drawdown supply, three tanks will
triple the drawdown supply, (Figure 1). Locate
pressure switch as shown. Tank and pressure
switch cannot be more than 10’ (3M) apart.
NOTICE Tank capacity is different than
drawdown. Tank capacity is the actual physical
volume of the sheet metal that makes up
thetank.
Operating Cycle
1. Tank nearly empty – air expands filling area
above bladder (Figure 2A).
2. Water enters tank – air is compressed above
bladder as it fills with water (Figure 2B).
3. Pump-up cycle completed – air compressed to
OFF setting of pressure switch (Figure 2C).
4. Water drawn from tank – compressed tank air
forces water out of bladder (Figure 2D).
5. Bladder empty – new cycle ready to begin
(Figure 2A).
Installation
Connect discharge pipe from pump to a tee.
Connect one side of tee to tank flange and the
other side of tee to service. Use plastic or steel
pipe as required. To prevent leaks, use PTFE
pipe thread sealant tape on male threads of all
threaded connections to tank.
NOTICE To be sure pipe joints are not cross-
threaded and all threads are clean, make
connections by hand (without sealer) first. When
threads are clean, remove pipe, add PTFE tape,
and remake connection. Tighten by hand first;
finish with pipe wrench.
When installing an elbow or nipple in the plastic
tank flange, tighten it hand tight plus 1-1/2 turns
with a pipe wrench. DO NOT OVERTIGHTEN!
Standard Tank Replacement
When replacing standard tank in a water system
with pre-charged tank, no bleeder orifices or Air
Volume Control (AVC) are required. When sizing
a pre-charged tank to replace a standard tank,
the tanks should have equivalent drawdowns.
For example, model CLPT20 pre-charged tank
has a drawdown of 5.8 gallons (22L) and is
equivalent to a 42 gallon standard tank that has
a drawdown of 4.3 gallons (16.3L).
Figure 2 - Tank Operating Cycle
WATER
WATER
WATER
To serviceFrom well
909 1015
Tanks
Pressure
switch
Figure 1
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