Pentair PSC-14-4-02 Installation And Operation Manual page 5

INSTALLATION & OPERATION
Connect system pipe to elbow on tank adapter fitting. 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 that joint is not cross-threaded and that
threads are clean, always make connections by hand (without
sealer) first. After making sure that threads are clean, remove
pipe, add PTFE tape, and remake connection. Do not overtighten
pipe connection at tank. Thread connection on hand tight plus 3
additional turns for steel pipe and 1-2 turns for schedule 40 PVC
pipe.
NOTICE: When replacing a standard tank in a submersible pump
system, raise pump and discharge pipe far enough to remove
bleeder orifices from the tees in the discharge pipe. Plug the
tees. When replacing a standard tank in a jet pump system,
remove Air Volume Control (AVC) and plug AVC port in pump.
In areas where the temperature is high for long periods of time,
the tank pre-charge pressure may increase. This may reduce
the tank drawdown (amount of water available per cycle). If this
occurs, reduce the pre-charge pressure to ten PSI below the
pump cut-in setting of the pressure switch.
It is necessary to flush all air out of the piping system and water
reservoir portion of the pre-charged tank. This is required on
new installations, pumps requiring repriming and pumps that
have been disassembled for service. Proceed as follows:
1. Open faucets furthest from tank and allow pump to operate.
2. Air in the system will cause a sputtering flow; allow faucets
to run until you have a steady, air free stream.
3. Open and close faucets repeatedly until you are sure all air
has been removed.
4. If stream does not become steady, air may be leaking into
the system; check for leaks in the piping on the suction side
of the pump.
NOTICE: To prevent waterlogging, check tank air charge every
six months.
CH21086 (08/01/21)
Figure 3: Use A Tire Gauge To Check Precharge In Air Cell
CHECK TANK AIR CHARGE
If drawdown (amount of water that comes out of tank per pump
cycle) decreases significantly, check as follows:
1. To check air charge in tank, shut off electric power to pump,
open faucet near tank, and drain completely.
2. Remove pole piece cap and check air pressure at the air
valve in top of tank with a standard tire gauge. See Figure 3.
Air pressure should be 4 psig below pump pressure switch
cut-in setting (if switch closes at 30 psig, pressure in tank
should be at 26 psig).
3. If the air pressure differential is more than 4 psig below the
cut-in setting, add air to the tank. Use an air compressor or
a portable air storage tank.
4. Use soap or liquid detergent to check for air leaks around air
valve. Continuous bubbling indicates a leak. If necessary,
install new core in air valve. This is the same as those used
for automobile tubeless tires.
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