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Technical manual
Page 29 of 72
ST0133 – A 02/09
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.