18
Thermomax 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
