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PressureWave
and PressureWave SF
TM
PLEASE READ ALL INSTRUCTIONS AND
WARNINGS BEFORE INSTALLING YOUR
NEW GLOBAL WATER SOLUTIONS PRES-
SURE TANK
These instructions have been prepared to acquaint you with
the correct method of installing and operating your GWS
pressure tank. Please read and follow these instructions and
heed any warnings to ensure safety and maximum product
performance. In the event of installation difficulties or need
for further advice, please contact the nearest GWS sales
office or dealer.
The following instructions and warnings are subject to
periodic updates and should be regularly reviewed on
the website www.gwsusa.com/support for important
safety information and instruction updates.
OPERATION
This pressure tank has been designed to store and deliver
potable water under pressure in a domestic water system.
It features a diaphragm or membrane design that keeps the
system water in a safe and contaminant-free chamber for
pressurized water supply between pump cycles.
Without a pressurized storage tank, a domestic water system's
pump would turn on every time there is a demand for water,
even if the demand is small. This frequent on/off cycling shortens
the useful life of the pump. Pressure tanks are designed to store
water when the pump is running and then deliver pressurized
water to the system when the pump is shut off (See Fig. 1). A
properly sized tank will store at least one gallon of water for
every gallon per minute (GPM) of pump capacity. This allows for
fewer pump starts and longer run times which maximizes the life
and efficiency of the pump system.
FIG. 1
THIS IS A SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU
TO POTENTIAL PERSONAL INJURY HA Z ARDS. OBEY ALL
SAFETY MESSAGES THAT FOLLOW THIS SYMBOL TO AVOID
POSSIBLE INJURY OR DEATH.
INDICATES A POTENTIALLY HAZARDOUS SITUATION WHICH,
IF NOT AVOIDED, COULD RESULT IN SERIOUS INJURY, DEATH,
AND/OR SIGNIFICANT PROPERTY DAMAGE.
1
GWS USA, Bradenton, FL, USA • support@gwsusa.com • (833) 261-5461 • www.gwsusa.com • 2020 Rev. 02.25
Series Pressure Tanks
TM
COMPLIANCE TO CODES
This pressure tank must be installed by a
qualified professional following all local and national plumbing
and electrical codes. The tank must be annually inspected for
visible signs of damage, corrosion, or leakage and replaced
immediately if these signs are present. Failure to follow
these instructions and codes may result in serious
injury, death and/or property damage and will void the
product warranty.
EXPLOSION HAZARD
This pressure tank is designed for water
storage at a maximum pressure of 150 psi and a maximum
temperature of 194° F. The system must be protected by
a suitable pressure relief valve set at a maximum of 100
psi. This pressure tank is shipped with a pre-charge of 38
psi and any adjustment to the pre-charge must be done prior
to installation and at ambient temperature. Do not adjust the
pre-charge of this tank if the product is corroded or damaged
or shows any signs of diminished integrity. The maximum
allowable pre-charge in this pressure tank is 80 psi. Failure
to follow these instructions may result in serious injury,
death and/or property damage.
P R O P E R P L A C E M E N T O F TA N K
This pressure tank should be installed
in a covered, dry area. This tank must not be installed in
a location that is subject to freezing or where it can rub or
vibrate against a hard surface. The tank must be installed in
a suitable location to prevent water damage due to leaks and
have means for adequate drainage. The manufacturer of
this product is not liable or responsible for any water
damage associated with the installation and/or failure
of this product. Failure to follow these instructions may
result in serious injury, death and/or property damage.
FO R P OTA B L E WAT E R U S E O N LY
This pressure tank is intended for use
with potable water systems only. Use with non-potable water
or any other fluid may be dangerous and will void the warranty.
This product's performance and lifespan can significantly be
impacted by aggressive water conditions. A water test should
be conducted specifically looking for corrosive water, acids
and other relevant water contaminants which, if present, must
be treated appropriately. The system piping must be properly
grounded to earth. A dielectric union may be required in the
system. Failure to follow these instructions may result in
serious injury, death and/or property damage.
C A L I F O R N I A P R O P O S I T I O N 6 5
WA R N I N G ! T h i s p ro d u c t c o nt a i n s a
chemical known to the State of California, if exposed, to
have the potential to cause cancer, birth defects or other
reproductive harm. (California installer – California law requires
that this notice be given to the consumer/end user of the
product). For more information, see Prop 65 details at www.
P65warnings.ca.gov.
ADJUSTING TANK PRE-CHARGE
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.
PRESSURE TANK INSTALLATION
TOOLS NEEDED
Adjustable Pliers
Adjustable Wrench
Hacksaw
Pipe Wrench
ACCESSORIES NEEDED
Check Valve
Drain Valve
Pressure Gauge
Pressure Relief 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.
Screwdriver
Tape Measure
Tire Pressure Gauge
Pressure Switch
Tank Connector Fitting
Teflon ™ Tape
2
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