Webasto Thermo Top V Operation And Maintenance Instructions page 5

The heater unit must not:
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The heater unit must:
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be exposed to temperatures higher than 120°C (storage
temperature). Exceeding this can cause permanent damage
to the electronics.
be operated without at least 20% share of an anti-freeze
approved by the manufacturer in the coolant of the heat
exchanger circuit.
be operated with the fuel and at the nominal voltage
indicated on the type plate.
if a large amount of smoke is given off, there are unusual
burning noises or smells, be switched off by removing the
fuse. Before using the unit again, have it checked by trained
Webasto personnel.
be operated for 10 minutes at least once each month with a
cold engine and the lowest blower setting. At the latest, at
the start of the cold season the heater unit must be tested
by a competent technician.
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