VRT 320/VRT 330
12
2 Installation
This system MUST be fitted by a qualified and
approved installation engineer, proceeding as
shown in the illustrations on pages 102 to 104. The
relevant safety guidelines should be followed at all
times.
There is a danger of fatal injury from tou-
ching live components. Always shut off the
power supply to the system (and ensure it
cannot be reconnected) BEFORE carrying
out installation or maintenance work.
Note that we will accept no liability whatsoever for
injury or damage resulting from failure to observe
these instructions. This condition applies especially
to incorrect wiring and/or defective mechanical
installation.
Two-point or constant regulation (page 103)
Two-point regulation (factory-adjustment)
is required if the power rating of the hea-
ting system is considerably more than the
calculated heat requirement (e.g. in order
to achieve a greater hotwater capacity).
Constant regulation is recommended if
the heat rating corresponds to the calcu-
lated heating requirement.
GB
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