Technical manual
SOLAR
The centre valve of the flush and fill point is being used to adjust the flow rate if re- quired.
Figure 30 - Pump characteristics and pump unit pressure drop SOLPU1 and SOLPU2
Expansion vessel fixing kit (8)
The expansion vessel fixing kit is not part of the scope of delivery of the pump units but is part of the standard Dimplex solar kits and is suitable for expansion vessels of up to 24 litre contents. It simplifies the expansion vessel installation and reduces the mainte- nance effort.
Flow meter (9)
The flow meter indicates the flow rate of the solar loop. It aids during the commission- ing process to adjust the flow rate correctly and assists during operation, maintenance and troubleshooting to identify eventual problems.
Air purger and related components (11, 14 and 15)
The heat transfer medium used has a high affinity to air, thus the air does not readily separate from the medium while the medium is cold. At the beginning of the operation of a solar thermal system therefore the heat transfer medium will release air into the system which would without the presence of a collection and separation device eventu- ally cause the system to stop functioning.
The air purger collects the dissolved air and it can be conveniently vented from the manual bleed valve. The flexible bleed valve discharge tube ensures that the venting process can be done safely.
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ST0133 – A 02/09
