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INSTALLATION
The tank listed below is pre-charged, or filled with air at the
factory, to 20 pounds per square inch (PSI) (138kPa). When
installing tank or if drawdown 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. At air valve, unscrew air valve protective cap and check
tank air pressure with tire gauge. See Chart 1 for the cor-
rect pressure setting. If needed, adjust the tank pressure
up or down. To do this, bleed air from or add air to tank
through valve on top of tank.
3. Use soap or liquid detergent to check for air leaks around
air valve. Continuous bubbling indicates leak. If necessary,
release air pressure and install new core in air valve (same
as used for automobile tubeless tires.)
NOTICE: Always set or check tank pre-charge with NO WATER
in tank and no water pressure in system. If you have already
pumped water before setting or checking the pre-charge pres-
sure, turn the pump off.
NOTICE: Replace and tighten air valve protective cap after
pressure is adjusted correctly. Failure to replace cap may
allow loss of air pressure and lead to tank waterlogging and
diaphragm failure.
Chart I
When Pressure Switch
Setting Is
20-40 PSI (138-276 kPa)
30-50 PSI (207-345 kPa)
(The first number on the pressure switch is the pump "ON"
setting; the second number is the pump "OFF" setting.)
Maximum
Catalog
Capacity
Number
US Gals (L)
RPT2
2 (7.6)
RPT5
5 (19.0)
NOTE: Pre-charge pressure is 20 PSI (138 kPa).
Reduce Tank
Precharge (PSI) To
18 (124 kPa)
28 (193 kPa)
Product Information – Pre-Charged Tanks
Drawdown - Gals (L)
Equivalent
to Standard
20-40 PSI
Tank (US Gals) (L)
(138-276kPa)
6 (23)
0.7 (2.6)
15 (58)
1.8 (6.8)
This tank is designed to be supported by the system piping
either directly above the pump or in a convenient location in
the piping system as close to the pump as possible.
NOTICE: Tank capacity is different than drawdown. Tank capac-
ity is the actual physical volume of the sheet metal that
makes up the tank.
STANDARD TANK REPLACEMENT
When replacing a standard tank in a water system with a 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.
Hazardous voltage and hazardous pressure.
Disconnect all power to pump and bleed all pressure from
system before working on pump, tank, or piping.
Air Valve
Protective
Cap
Air Valve
Figure 1: Air valve and protective cap.
Tank
Diameter
30-50 PSI
(207-345kPa)
in. (mm)
0.6 (2.3)
8-3/8" (213)
1.5 (5.7)
10-5/8" (270)
3
3820 1100
Tank
Tank
Height
Discharge
in. (mm)
Tapping
12-9/16" (319)
3/4"
16-1/4" (411)
3/4"
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