Stop; Operating Mode Led - Munters GFn Mode D'emploi Et D'entretien

• do not repeat the startup procedure for more than
3 times if the burner doesn't start. Repeated start-
up's cause accumulation of fuel in the combustion
chamber which
consequence. Contact
customer service representative.
If the start-up of the air heater doesn't follow
NOTE
the sequence of events described above then, see
Chapter 6.4. Identify the cause of the malfunction
before making any operation.

6.2 Stop

Follow the procedure below to switch off the air
heater:
• push the heaters operating mode switch to
position 0 (stand-by);
• in heating mode, the burner stops but the fan
continues to operate to cool down the heater and
will stop as the internal temperature has reached
a proper level;
• in ventilation mode, the air blower will stop
rotating;
• push the heaters main switch to position 0 (OFF);
• turn off the electrical supply system e.g. press the
circuit breaker on the main electrical panel;
• close the fuel supply valve(s).
WARNING Always
shutdown or stop of the air heater allowing the post
ventilation cycle to be completed. Lack of proper
cooling of combustion
excessive overheating and damage the unit.
Carefully observe the following points:
• do
not remove
disconnecting the electrical line;
• do not remove the electrical power by pushing the
air heaters main switch to 0 'OFF';
• do not remove the electrical power if the fan has
not stopped rotating. The fan stops rotating when
the combustion chamber is sufficiently cool.

6.3 Operating mode LED

The safety devices installed on the GFn air heater
are already set in the optimum way, therefore it is
extremely important not to change or modify the
internal settings.
WARNING Carefully observe the following
points:
• do not modify the settings and/or position of the
safety devices;
• do not defeat the safety devices.
The GFn air heater is equipped with the following
safety devices:
• photo cell for flame monitoring. This device
intervenes on the electrical board when the flame
might deliver dangerous
technical support
follow the complete
chamber may
the electrical power
is lacking or inconsistent e.g. fuel starvation,
flame extinguishing, etc;
NOTE In case of flame failure at start or electrical
line failure (black-out), the heater goes to safety
or lock-out mode:
• the burner stops immediately, the air blower
completes the post-ventilation cycle and then
stops, the reset pushbutton lights up, or;
• the reset pushbutton lights up when the
electrical line is active again.
To restart the air heater:
• allow the heater to cool down and stop
• check and correct the cause(s) of flame failure.
See Chapter 6.4 for common causes of lock-
out. Call qualified personnel for assistance if
needed;
• push the burner reset pushbutton;
• repeat the start-up procedure.
• safety thermostat with manual reset and fixed
setting monitors the hot air temperature. This
device avoids the dangerous overheating of the
combustion chamber. The positioning and setting
of the safety thermostat is determined in the
factory and must not be modified. When this
safety thermostat intervenes the air heater is
blocked. If this situation occurs then, disconnect
the air heater from the mains and eliminate the
cause of the overheating;
NOTE If the air temperature exceeds the settings of
the safety thermostat:
• the burner stops immediately;
cause
• the air blower completes the post-ventilation cycle
and then stops;
To restart the air heater in case of overheating
• allow the heater to cool down and stop;
by
• check and correct the cause(s) of overheating,
that may include:
• incorrect safety distances around the unit;
• restrictions or blockage of air inlets, outlets;
• too high ambient temperature;
• incorrect burner settings;
• fan failure;
• supply voltage abnormalities (e.g. voltage
drops).
• unscrew overheating thermostat RESET cap;
• push the overheating RESET button and then
Lock-out Reset button.
WARNING
repeatedly or abnormal operation the air heater
then, disconnect the air heater from the mains and
contact qualified personnel and customer service
representative.
WARNING
from the mains while it is functioning. Allow the
cooling sequence to carry on until complete,
otherwise the residual heat could damage the
components or trigger the safety thermostat.
12 | © Munters AB, 2019
If the safety devices
Do not disconnect the air heater
trigger