BIEMMEDUE SCUDO 235T Manual De Instrucciones página 42

Press key (a) twice: the screen shows the operating time in hours
[h]:
Warning
The time shown is not actual heating time, but connection
time to the electrical power supply line.
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
L-L 273.01-BM
EN
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.
a
• if the red arrow at the symbol "+"is ON, it means that the
temperature is above the set value and, therefore, the thermostat
b
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..
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
Check heater
Check gas supply line
Clean exterior of heater
Clean motor and fan
Check gas supply pressure
Check electrical connections
Check and test burner
Check thermostats
Clean interior of heater
Inspect and
chamber
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
6. MAINTENANCE
Periodic maintenance
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clean combustion
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