Desa BG SERIES Operating Instructions Manual page 28

ANOMALY
THE BURNER GOES OUT
ANOMALOUSLY AND BY CHANCE
LIMIT THERMOSTAT OPERATES
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FAN MOTOR THERMAL CUT-OUT
ACTUATES (ONLY FOR THREE-
PHASE VERSIONS)
THE FAN DOES NOT START WITHIN
APPROX A MINUTE AFTER BURNER
IGNITION
CAUSES
Actuation of the LIMIT thermostat
Flame detaches from burner
Room thermostat not correctly
installed
Obstructions in the air circuit
Hot air backflow
Fan assembly to be checked or faulty
Excess thermal power
Excess current intake and/or heating
of the fan motor
Insufficient thermal power
Double thermostat FAN-LIMIT to be
checked or faulty
28
REMEDIES
Check the aperture of the air flow direction
control vanes
Check for the absence of obstructions on the
air inlets
Check the fan motor
Check burner settings
Check that the generator is not in a room
subject to pressure drop
Check that the sensitive element of the room
thermostat is not in the flow of hot air from
the generator
Check that the airflow control vanes are
open
Check for the absence of obstructions on the
air inlet grilles
Check the aperture of the airflow control
vanes so that there is no backflow of hot air
to the inlets.
Check the temperature of the inlet air
Check that the fan rotor is clean
Check the efficiency of the fan motor
Check the state and tension of the belts
(three-phase version only)
Check for anomalous action of the motor
thermal cut-out (three-phase version only)
Check the settings of the oil burner
Check that the air distribution plenum is
installed
Check the electric supply voltage
Check the inlet air temperature
Check the oil burner settings
Check the FAN settings
Replace the double thermostat FAN-LIMIT