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CAUTION:
Additives (such as glycol) can affect the thermal
expansion and expansion tank operation. Check with your
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
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
by the tank air valve accordingly. Make sure the tank is completely
drained of water and there is no system pressure affecting the
precharge pressure reading when adjusting tank precharge.
2.2 Thermal Expansion Tank Location
As tanks, pipes and connections can leak even when installed
correctly; make sure to install the tank at a location where any
leak will not cause water damage. The thermal expansion tank
should be installed on the cold or supply side of any heating
system. The tank should be installed indoors and protected from
freezing temperatures.
2.3 System Connection
Fig. 2.3-1
Fig. 2.3-2
Hot
Relief
Valve
Relief
Valve
BackFlow
Preventer
or Check
Valve
BackFlow
Preventer
or Check
Valve
Vertical
Tank
w/ Base
Inline
Tank
Cold
Hot
Cold
Thermal expansion inline tanks are designed to be supported by
system piping and should be connected to the system piping using
a “T” connection (See Fig. 2.3-1). Optional wall mounting brackets
are also available for increased support (check with your local
GWS dealer for more information). Vertical tanks with base are
designed to be self-supporting and should be connected to the
system with additional piping (See Fig. 2.3-2).
2.4 Solar Heating System Connections
Fig. 2.4
Hot
Cold
Pump
Pump
Solar Collector
Condenser
SolarWave
TM
Tank
SolarWave™ tanks are intended for use in the solar liquid
loop of indirect thermal transfer systems and may be mounted
either on the suction or pressure side of the circulation pump.
If a condenser is employed to cool evaporated solar liquid it
must be in the location between the solar liquid loop and the
expansion tank. A relief valve should be employed and maximum
operating parameters must not be exceeded. If the temperature
of the solar system has the potential to rise above the evaporation
point of the solar liquid, a condenser chamber or coil is required
between the solar collector and the expansion tank (See Fig. 2.4).
2.5 Thermal Expansion Operating Principles
As water is heated it expands. A thermal expansion tank is used to
accommodate for this natural water expansion, which otherwise
may lead to increased system pressure and cause damage
expansion tank uses a diaphragm membrane sealed inside the
vessel to create a barrier between water and air chambers. The
air chamber acts as a cushion which compresses as heated water
expands. The thermal expansion tank absorbs the expanded water
volume and ensures constant system pressure is maintained. Using
a thermal expansion tank also conserves water and energy. This
lost due to venting from the relief valve during heating cycles.
3. Disposal
Check with local authorities for
proper disposal and recycling.
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