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FPW Collector Installation Manual
Pressure Relief Valve (PRV)
Rated at 6 bar, the PRV may discharge heat transfer fluid (Solar Antifreeze Fluid) which must be
channelled into a container capable of withstanding high temperature discharge and containing
the total collector volume. The container should be secured so it cannot be removed or spilled.
The PRV should not be channelled into a drain or any pipe work which will allow it to enter the
normal water course.
Fitting the expansion vessel:
It is recommended that the expansion vessel is located below the level of the connection from
the pump station to prolong its life.
The expansion vessel supplied includes an appropriate corrugated hose and threaded connection
to join the vessel to the pump station.
Temperature Reducing Vessel (TRV)
Also known as a ‘cooling vessel’ or ‘stratification vessel’, the TRV is highly recommended with the
Thermomax DF400. Due to high temperatures which can be experienced within the solar loop, the
TRV allows for additional expansion and reduces the temperature of the heat transfer fluid before
it enters the expansion vessel.
Fitting the TRV:
With the direct flow vessel kit, which includes the TRV, a corrugated hose assembly is included to
join the expansion vessel to the TRV from the pump station.
Safety Vessel Connections
TRV
1
2
6
4
5
2
3
1
PRV discharge point
2
Wall bracket (supplied)
3
Discharge container
4
TRV kit DF100/400 only
5
Expansion vessel
6
Dual stream pump station
