Installation - Pentair PSC Series Owner's Manual

Installation • Operation

Installation

Connect system pipe to elbow on tank flange. 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 two 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.
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 2 psig below
pump pressure switch cut-in setting (if switch closes
at 30 psig, pressure in tank should be at 28 psig).
Figure 3: Use A Tire Gauge To Check Precharge In Air Cell
3. If the air pressure is more than 2 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.
Check Pump Pressure Switch Setting
1. To check pressure switch setting, disconnect power
to pump at supply panel (but be sure to leave
pressure switch connected to power supply wires).
2. Remove pressure switch cover.
3. Open a faucet near tank.
4. Allow water to drain until pressure switch contacts
close; immediately close faucet.
5. Check pressure at valve with standard tire gauge or
with pump pressure gauge (if supplied).
6. Pressure gauge should read 2 psig below pump
cut-in setting (28 psig for 30-50 switch, 18 psig for
20-40 switch, etc.) If not:
A. Adjust switch according to switch
manufacturer's instructions.
B. Reconnect power supply to pump and pump up
pressure in system.
C. Disconnect power supply to pump again and
re-check switch setting.
D. Repeat until pressure switch starts pump within
±1 psig of proper setting.
E. If cut-in setting is too low, system will rattle or
develop water hammer when pump starts.
F. Cut-out setting is not as critical as cut-in setting.
Make sure that pump will stop running in a rea-
son able time. If it does not, cut-out setting may
need to be adjusted down slightly. Be sure that
after readjustment, system does not rattle or
hammer on startup.
7. Re-check tank air pre-charge to be sure it is 2 psig
below pump pressure switch cut-in setting.
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