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Technical manual
Page 36 of 72
ST0133 – A 02/09
SOLAR
It is not recommended to fit vessels larger than 24 litres using the expansion vessel
fixing kit as faulty vessels gain considerably in weight and the wall bracket would not
support the additional weight.
The 500mm corrugated stainless steel hose allows the expansion vessel to be directly
connected to the expansion vessel connection port of the Dimplex solar pump units
SOLPU1 and SOLPU2.
The quick fit connection is a combined retainer and vessel connection. The vessel con-
nection incorporates a fast acting two way valve operating always in the direction of
lower pressure. Should the vessel need maintained or replaced, the fitting eliminates
the need for the system to be drained down as it will close as soon as the vessel dis-
connects from the circuit.
Once the vessel is maintained or replaced the same fitting can be used to reconnect the
vessel to the system.
4.5.2 Technical data
Figure 37 – Technical data Dimplex expansion vessel fixing kit SOLVK1
4.6 Dimplex heat transfer medium SOLHT20
4.6.1 General description
The Dimplex solar heat transfer medium SOLHT20 is a ready to use 1.2-polypropylene
glycol fluid for solar thermal installations. The product has particularly good characteris-
tics at higher temperatures where the liquid inhibitors resolve more readily back into
the solution than solid inhibitors.
This increases the useable life of the product, reduces the acidity of the medium when
at high temperatures and ensures the frost protection function is not being lost. In addi-
tion the inhibitors will not solidify inside the solar system and block ducts with small
diameters.
The heat transfer medium is ready mixed and must not be diluted on site. When re-
placement of lost medium is required it is important to ensure that only the same me-
dium is being used.
Dimplex provide a test kit, SOLHTTK, to monitor the condition of the medium over the
course of its life.