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Correct pre-charge is required for proper tank performance. Any adjustments to the factory pre-charge must be done
prior to initial tank installation and with zero pressure on the system.
Do not adjust the tank air pressure if there are any visible signs of corrosion on the tank. If this pressure tank
shows any visible signs of corrosion or rusting, the tank must be replaced immediately. Failure to follow these
instructions may result in serious injury, death and/or property damage.
DO NOT ADJUST THE PRE-CHARGE OF THE PRESSURE TANK WITH THE SYSTEM UNDER PRESSURE.
This pressure tank is shipped from the factory with a pre-charge of 38 psi.
1. For tanks installed with a fixed speed pumping system with a differential pressure set up to 30 psi, the pre-charge should be
set to 2 psi below the cut-in pressure. (Example: In a 20/40 pressure switch, the tank is set to 18 psi; a 30/50 pressure switch,
tank is set to 28 psi; and a 40/60 pressure switch, tank is set to 38 psi.)
2. For tanks installed with a pump controlled by a pressure switch with a pressure differential greater than 30 psi, electronic
controls or variable speed controls, the pre-charge should be set to 65% of the maximum system pressure.
3. For tanks installed on mains pressure, the tank pre-charge should be set equal to the system pressure. If the system pressure
exceeds 88 psi then a suitable pressure reducing valve should be installed.
IN NO EVENT SHOULD THE TANK PRE-CHARGE EXCEED 80 PSI.
TO ADJUST TANK PRE-CHARGE PRIOR TO INSTALLATION
• Remove the protective cap from the air valve.
• Check the tank pre-charge pressure using a suitable pressure gauge.
• If required, add air at ambient temperature to the tank using a manual pump or air compressor until the proper pre-charge
pressure is reached.
• Replace the protective cap on the air valve.
TO ADJUST TANK PRE-CHARGE AFTER INSTALLATION (IF REQUIRED)
• Disconnect all power to the system pump.
• Drain the tank of water by opening a faucet or drain valve.
• Add or release air at ambient temperature, if required, using a manual pump or air compressor until the proper pre-charge
pressure is reached.
TOOLS NEEDED
Adjustable Pliers
Adjustable Wrench
ACCESSORIES NEEDED
Check Valve
Drain Valve
INSTALLATION LOCATION
The tank must be installed in a suitable location to prevent water damage due to leaks and
have adequate drainage. The manufacturer is not liable for any water damage that occurs in
association with tank installation or failure.
In order to ensure your tank provides its maximum service life, it should be installed in a covered, dry area that is not subject to
freezing. This tank must not be installed in a location where it can rub against a hard surface such as a wall.
The tank should always be located downstream from the pump. If the tank is located at a lower elevation than the demand, a
check valve must be installed.
The tank should be located as close as possible to the system pressure switch, transducer or flow sensor to reduce the
negative effects of added friction loss and/or differences in elevation between the tank and these components.
This tank has been designed to be mounted on a level surface and must be adequately supported around the entire base using
the mounting holes or brackets provided. Inline tanks should be connected directly to the pump or the supply line using a 3- or 5-
way fitting.
ADJUSTING TANK PRE-CHARGE
PRESSURE TANK INSTALLATION
Hacksaw
Pipe Wrench
Pressure Gauge
Pressure Relief Valve
Screwdriver
Tape Measure
Pressure Switch
Tank Connector Fitting
Tire Pressure Gauge
Teflon ™ Tape
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