5
Operating sequence
After switching on the units,
the supply air fan is put into
operation and the electric solenoid
valve is opened.
However, the gas supply to
the burner remains closed at this
point.
Only after actuating the pressure
pin of the safety pilot is the gas
supply to the gas burner enabled.
The liquid gas is now transported
through the gas nozzle under
pressure into the mixing tube.
Here, the liquid gas is enriched
with a quantity of oxygen
determined based on the
respective burner output.
The gas/air mixture produced in
this way is ignited at the burner
head by an electric ignition spark.
The ignition spark is generated
through the manual actuation of
the piezo igniter.
The heating of the thermocouple
activates the thermal monitoring
of the flame in operation.
The pressure pin of the safety pilot
must now be released.
In the event of any irregularities
or if the flame is extinguished,
the gas supply is interrupted.
A safety temperature limiter (STB)
interrupts with an overheating
of the gas supply and interlocks
all unit functions.
Regulation of the min/max heating
capacity can be implemented on a
stepless basis during unit operation
on the integrated “power
regulation”.
Unit description
The units are mobile fan-assisted
air heaters (WLE) directly fired
with liquid gas, without a heat
exchanger.
The units operate without an
exhaust gas connection and
are designed exclusively for
commercial use.
The units are equipped with
integrated power regulation
for the stepless control of
the heating capacity, quiet and
low-maintenance axial fans,
robust gas burners with thermal
monitoring, electric solenoid valve,
piezo ignition and mains cable with
earthed safety plug.
The units are intended exclusively
for manual operation and cannot
be thermostatically controlled.
The units conform to
the fundamental health and safety
requirements of the appropriate
EU stipulations and are simple
to operate.
The units are EC type-tested,
DVGW-registered and approved
for EU countries.
The units may be used among
other things for the following:
■
Drying newly completed
buildings
■
Spot heating of outdoor
workplaces
■
Spot heating workplaces
in open, non-flammable
manufacturing facilities and
halls
■
Temporarily heating enclosed
spaces with a sufficient fresh air
supply
■
De-icing machines, vehicles and
non-combustible warehoused
goods
■
Maintaining the temperature
of frost-sensitive parts
Monitoring the units
It is possible to safely monitor all
functions with the safety devices
of the units.
In the event of irregularities or if
the flame is extinguished, the units
are switched off and interlocked.
Safety temperature limiter (STB)
The units are equipped with a
safety temperature limiter (STB),
which interrupts the gas supply
in case of overheating and
electrically interlocks the unit.
A manual reset of the STB can only
be implemented after the units
have cooled down.
The STB is reset by actuating
the reset key 2.
1. Unscrew the protective cap 1.
2. Push in the pressure pin 2.
3. Screw the protective cap 1 back
on again.
1
2
CAUTION
Safety devices must not
be bypassed or disabled.
NOTE
For optimum operation
the units should not be
operated above an ambient
temperature of 25 °C.
CAUTION
If the safety temperature
limiter has been triggered,
the cause of the malfunction
must be identified and rectified
before a reset is performed.
