EN
L-L 274.00-BM
Reset the counter as follows:
• Turn the heater’s main switch to position “0” (OFF)
• Press button P on the temperature controller for at least 3
seconds: the word “PASS” will flash for 5 seconds
• Enter code “-481” by pressing key (b) several times until obtaining
the number required; press key P to confirm and go to the next
number
• Lastly, press key U: the display again shows the air outflow
temperature
Control of trip temperature of fan thermostat
The temperature controller is programmed to start and stop the
main fan automatically when the combustion chamber reaches the
set temperature. This prevents cold air from blowing when the
burner starts and the combustion chamber is not yet hot enough,
and ensures that residual heat in the heater is dissipated when the
burner stops.
The temperature is factory-set to 35°C, with hysteresis of 5°C.
Red LED “OUT 1” shows the operating state of the fan thermostat:
• LED ON: the fan is on
• LED OFF: the fan is off
Control of trip temperature of burner thermostat
The temperature controller is programmed to start and stop the
burner automatically when the combustion chamber reaches the set
over-temperature. This prevents excessive overheating of the
combustion chamber and subsequent tripping of safety thermostat
L2, which blocks operation of the heater (see chapter 7 for details
on operating problems that cause tripping of safety thermostat L2).
The temperature is factory-set to 95 °C, with hysteresis of 5°C.
Red LED “OUT 2” shows the operating state of the burner
thermostat, while the LED group “- = +” indicates the current
temperature compared to the set temperature:
• if the red arrow at the symbol “-“ is ON, it means that the
temperature is below the set value and, therefore, the thermostat
is ON, i.e., the burner is ON.
• if the green LED at the symbol “=1“ is ON, it means that the
temperature is at the set value.
• if the red arrow at the symbol “+“is ON, it means that the
temperature is above the set value and, therefore, the thermostat
is OFF, i.e., the burner is OFF.
Warning
The trip temperatures of the fan thermostat and burner
thermostat should be changed only if absolutely
necessary. Contact the manufacturer for information
needed to reprogram the temperature controller..
6. MAINTENANCE
Warning
All of the operations described in this section must be
performed by professionally qualified personnel only.
The following procedures must be done at regular intervals to
ensure efficient operation of the heater. Make sure you have
detached the electrical power line from the heater before starting
any work.
Warning
Before doing any maintenance:
• Stop the heater as indicated in the “STOP” paragraph;
• Switch off the power supply by means of the cut-off on
the electrical panel;
• Wait until the heater cools.
Procedure
Periodic maintenance
Ev
er
y d
ay
Ev
er
y we
ek
Every six
months
Eve
ry y
ea
r
Check heater
X
Check gas supply line
X
Clean exterior of heater
X
Clean motor and fan
X
Check gas supply pressure
X
Check electrical connections
X
Check and test burner
X
Check thermostats
X
Clean interior of heater
X
Inspect and clean combustion
chamber
X
6.1. CHECKING THE HEATER AND THE GAS SUPPLY LINE
Perform the following checks:
• Make sure the heater is not installed where there may be a risk of
fire or explosion
• Make sure that flammable materials are kept a safe distance away
• If you smell:
• Open the windows immediately
• Do not touch electrical switches
• Close the gas stopcock
• Find and repair the source of the gas leak
• Do not use the heater if any removed panels have not been
remounted
• Make sure the room to be heated is sufficiently ventilated
• Make sure that the air intake and outlet are completely
unobstructed
• Make sure that the heater is not covered by any sheets or covers;
• Check that the heater is in a fixed and stable position;
• Make sure the heater is constantly monitored during operation and
checked before being started
6.2 CLEANING THE EXTERIOR OF THE HEATER
To ensure efficient operation, clean the following parts:
