Global Water PressureWave Series Installation And Operating Manual page 6

CONFIDENTIAL
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Pressure
Switch
Fig. 1.4-5 Booster Pump w/ Inline Tank
Pump
Transducer
Pressure Gauge
Fig. 1.4-6 Booster Pump w/ Tank
1.5 Multiple Tank Installation
All tanks must have the same precharge for the system to function
properly. Tanks should be installed on a header to ensure all tanks
receive equal and balanced pressure. Adjust each tank precharge
as detailed in section 1.3. The system pressure switch or control
should be centrally located (see Fig 1.5) in order for the tanks to
function properly.
NOTE: All tanks must have
equal precharge
Header to be sized
for maximum velocity of
1.8m/sec (6ft/sec)
Fig. 1.5 Multi-tank Installation
1.6 Pump Run Control Operating Principles
Without a pressure tank, a water system's pump would cycle
(turn on) every time there was a demand for water. This frequent
and potentially short cycling would shorten the life of the pump.
6
Tank
Pressure Gauge
Pump
Tank
Water Flow
Relief
Pressure
Valve
Switch
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Pressure tanks are designed to store water when the pump is
running and then deliver pressurized water back to the system
when the pump is shut off (Fig 1.6). A properly sized tank will
store at least one liter of water for every liter per minute (LPM) of
pump capacity. This allows for fewer pump starts and longer run
times which should maximize the life of the pump.
1. Before drawdown 2. During
drawdown
Fig. 1.6
1.7 Replacing Plain Steel Tanks with GWS Tanks
GWS recommends that defective plain steel tanks are replaced
with GWS tanks. It is strongly recommended that a relief valve is
installed at the GWS tank connection. Also be sure to plug the
air port on a jet pump, as air is no longer required to be supplied
to the tank.
2. Thermal Expansion Tank Installation
Thermal expansion tanks are designed to accommodate the
natural expansion of water as it is heated. Thermal expansion
tanks may be used in several different applications including
closed loop hydronic heating systems, direct and indirect solar
heating systems, and open loop potable water heating systems.
GWS has developed three different series of tanks to be used for
each application: HeatWave™ for closed loop hydronic heating
systems, SolarWave™ for indirect closed loop solar heating
systems, and ThermoWave™ for direct solar heating and open
loop potable water heating systems. For high volume thermal
expansion applications Challenger™ and SuperFlow™ Series
tanks may be used.
⚠ CAUTION: Check tank data label for maximum operating
pressure and temperature prior to installing.
⚠ CAUTION: Additives (such as glycol) can affect the thermal
expansion and expansion tank operation. Check with your
GWS dealer or nearest GWS sales office for more details.
⚠ WARNING: It is strongly recommended that any heating
system is protected by a suitable pressure relief valve set
at or below the maximum tank pressure rating. Failure to
install a relief valve may result in tank explosion in the event
of a system malfunction or over pressurization, resulting in
property damage, serious personal injury or death.
2.1 Precharge
Using a suitable pressure gauge, check the tank precharge
pressure prior to installation. Refer to the tank data label for
factory precharge pressure. HeatWave™ tanks in closed loop
heating circuits should be precharged to system fill pressure.
ThermoWave™ tanks in open loop heating storage systems
should be precharged to mains' pressure. For SolarWave™ tanks
in closed loop solar systems precharge should be set at minimum
system operating pressure and / or fill pressure. Release or add air
by the tank air valve accordingly. Make sure the tank is completely
3. Pump comes on
and begins to fill
the tank