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44 | Heating system inspection and maintenance
7.4
Checking the operating pressure
A distinction is generally made between open vented
and sealed unvented heating systems. In practice, open
vented heating systems are now only rarely installed.
For information on the quality of the heating
water (
see operating manual).
NOTICE: System damage due to frequent
topping up!
The heating system may be damaged,
depending on water quality, by corrosion or
scaling if you frequently need to top up your
system with water.
B Ensure that the heating system is vented
correctly.
B Check the heating system for leaks and
the expansion vessel for correct
operation.
B Observe the requirements in respect of
water quality.
NOTICE: System damage due to
temperature stresses!
Temperature stresses can cause cracks if
you fill your heating system when hot. The
boiler will then leak.
B Only fill the system when cold (the flow
temperature should be no more than 40 °C).
B During operation, via an approved WRAS
filling method and never directly fill into
the boiler.
6 720 803 940 (2010/03)
UNI 7000 F
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