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7
Operation of the safety
thermostat and associated
interlock of the safety
thermostat (STB).
The unit cannot be restarted
without manual reset
Damage to electric cables
Safety thermostat(s)
Each fan in the units has a safety
thermostat (STB) for manual reset.
Operation of the safety thermostat
triggers a safety shutdown.
The thermostat is arranged in
the area of the heat exchanger in
order to monitor the temperature
at its outlet.
Blocking of the unit caused by
operation of the safety thermostat
is indicated as fault F2 at the
temperature control.
Air/gas premixture
The units are provided with a
burner with complete air/gas
premixture.
Mixture takes place in the burner
motor fan.
The air sucked in by the fan fl ows
through the Venturi tube, where a
vacuum is produced, which draws
the gas.
This produces a constant air/gas
mixture. The ratio of air and gas
pressure is 1:1.
This value can be changed with
the offset regulating screw located
on the gas valve.
The gas volume is already adjusted
on delivery of the units and the
screw is sealed.
Fine adjustment can be made
with the adjusting screw on the
Venturi tube. This screw regulates
the maximum gas fl ow rate and
accordingly determines the carbon
dioxide (CO2) content of the
exhaust gases.
The screw is not sealed so as to
allow the hot air heater to be
changed to a different type of gas
if necessary.
NOTE:
For offset and CO2 adjustment.
The control board of the units
controls the burner motor speed
with DC current depending on the
room heat demand.
The air and accordingly the gas
ow rate changes with changing
speed.
The minimum and maximum fan
speeds are two values that cannot
be changed.
Fans
The circulation air fans are
switched on by the control board
time-controlled, whereby time
control starts when the main
burner is switched on.
The delayed switch on prevents
cold air from being blown into the
room.
Switching off the unit
If there is no more heat demand
(room temperature above the set
value), the control board switches
off the burner.
The burner fan continues to run
for a preset time in order to cool
the combustion chamber.
The circulation air fan (possibly
also more than one) also continues
to run time-controlled until the
heat exchanger has cooled down.
If there is a renewed heat demand
during the after-running phase,
the control board will wait for the
fans to switch off and only then
perform a reset and begin with a
new cycle.
IMPORTANT INFORMATION!
Interrupting the power supply
during burner operation or the
residual heat removal phase must
be avoided as a lack of cooling of
the heat exchanger can lead to
considerable damage.
Overheating of the unit with
invalidation of the warranty
Damage to the burner fan and
its components
ATTENTION
Before resetting a safety
device, the cause of its
operation must be located and
eliminated.
NOTE
Safety devices must not be
overridden or blocked during
operation of the unit.
7


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