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General Information / Installation
OPERATING CYCLE
Step 1. Tank nearly empty – air expands filling area
above bladder (Figure 1A).
Step 2. Water enters tank – air is compressed
above bladder as it fills with water
(Figure 1B).
Step 3. Pump-up cycle completed – air compressed
to OFF setting of pressure switch (Figure 1C).
Step 4. Water drawn from tank – compressed tank
air forces water out of bladder (Figure 1D).
Step 5. Bladder empty – new cycle ready to begin
(Figure A).
A
Air
C
Air
Water
Figure 1
INSTALLATION
Connect discharge pipe to the tank tee. Use plastic
or steel pipe as required. To prevent leaks, use
Teflon tape or Plasto-Joint Stik
all threaded connections to tank.
NOTICE: To be sure pipe joints are not cross-
threaded and all threads are clean, make connec-
tions by hand (without sealer) first. When threads
are clean, remove pipe, add Teflon tape or Plasto-
Joint Stik, 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 Air Volume Control
(AVC) is required. When sizing a pre-charged tank
to replace a standard tank, the tanks should have
equivilant drawdowns.
1
Lake Chemical Co., Chicago, Illinois
For parts or assistance, call Master Plumber Customer Service at
(FIGURE 1)
B
Air
Water
D
Air
Water
on male threads of
1
Adjusting Tank Pre-charge
In areas where temperature is high for long periods
of time, tank pre-charge pressure may increase.
This may reduce tank drawdown (amount of water
available per cycle). If this occurs, adjust pre-
charge pressure according to Chart 1, page 3.
Flush all air out of piping system and water reser-
voir portion of pre-charged tank. Required on: new
installations, pumps requiring repriming, and
pumps disassembled for service. Do as follows:
Step 1. Open faucets furthest from tank and run
pump.
Step 2. Run pump until sputtering stops and steady
stream of water flows.
Step 3. Open and close faucets repeatedly until all
air has been removed.
Step 4. If stream does not become steady, air may
be leaking into system; check for leaks in
piping on suction side of pump.
NOTICE: To prevent waterlogging, check tank air
charge annually.
TO CHECK TANK AIR CHARGE
If drawdown decreases significantly, check as
follows:
Step 1. To check air charge in tank, shut off electric
power to pump, open faucet near tank, and
drain completely.
Step 2. At air valve, check tank air pressure with
tire gauge. See Chart 1, page 3, for correct
pressure setting. If needed, adjust tank pres-
sure up or down.
Step 3. Use soap or liquid detergent to check for
air leaks around air valve. Continuous bub-
bling indicates leak. If necessary, release air
pressure and install new core in air valve,
(same as used for automobile tubeless tires.)
1-800-628-9439
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