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also stop. The purpose of letting the fan run for a few
minutes longer than the burner is to cool down the
burner chamber and heat exchanger slowly to avoid
possible damage by rapid contraction of the metal.
After the fan has stopped it may happen that the
burner chamber and the heat exchanger are still so
hot that the fan will start again a few minutes later.
- If a fault occurs in the unit the built-in safety
thermostats will stop it immediately. The Limit-
thermostat will switch off the burner when the air
temperature has reached 80°C. When the temperature
has dropped the burner will start automatically again.
The fan is still running. When the temperature in the
unit exceeds 100°C the safety temperature limiter
(STB) will be activated and switch off the unit as well
as the fan. It will now only be possible to start the unit
after a manual resetting.
2. Positioning and mounting
When positioning the unit all legal requirements such
Fig. 1/2
as gas, electric and building regulation must be
observed.
There must be free access to the unit from all sides,
so that all components can be inspected.
The space, in which the unit is placed, must be
sufficiently ventilated. Negative pressure in the space
must not occur, for instance as a result of the operation
of the burner or the exhaust, as this could result in
oxygen deficiency at the burner, which might result in
bad combustion or faults at the burner. In such cases
a separate fresh air intake for the burner will have to
be installed.
The position of the unit must be chosen in such a way
that the heated air is not blown directly against pillars,
shelves, partition walls etc.
2.1 Mounting
The unit is delivered placed horizontally on a wooden
pallet. After removing the packing the DV 45-300 unit
is raised on end by means of a crane or a fork-lift truck
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