Riello RN 70 Installation, Use And Maintenance Instructions page 24

FAULT
No pre-heating of fuel
Insufficient pre-heating
Pump not starting, when the temperature (approx.70°C)
is reached on the low point thermostat 4)(Fig.4).
Burner not starting when SET2 temperature is reached.
Burner starting and then shutting down by lock-out.
Hydraulic circuit not pressurising with consequent lock-
out at ignition.
Lock-out at ignition.
Burner not passing to 2nd stage
Shut down during operation.
Lock-out during operation and attempt to repeat the
cycle.
Dirty combustion head.
PROBABLE CAUSE
• No power
• Burner/Bag disconnected from each other.
• Adjustment or safety control device is open
• Faulty high point thermostat 5)(Fig.4)
• High point thermostat with reset push-button 6)(Fig.4) has operated
• Heating elements contactor failed
• Oil pressure switch 7)(Fig.4) open due to lack of or insufficient loop pressure
• Faulty Pt 100 probe or temperature controller
• Faulty temperature controller transformer
• Tank heating elements interrupted
• Incorrectly set electronic thermostat
• Faulty low point thermostat (not enabling)
• Pump motor thermal relay lock-out
• Faulty contactor
• Faulty pump
• Temperature controller either faulty or with incorrect parameters
• Locked-out fan motor thermal relay
• Faulty servomotor not going into 1st stage
• Short-circuited photocell
• Foreign light, flame simulation
• Valve 12)(Fig.4) not closing (coil interrupted, pre-heating element not operat-
ing)
• Dirty or misshapen nozzle
• Incorrectly adjusted electrodes
• Faulty high voltage cables
• Faulty ignition transformer
• Fan motor thermal relay tripped
• 1st stage solenoid-valve on nozzle holder not opening
• Fuel leaking out of pistons 3)(Fig. 29) preventing them from opening
• Faulty photocell or control box
• Insufficient pressure or temperature
• Flame detachment due to excessive air
• 2nd stage thermostat open
• Faulty or incorrectly set servomotor
• Servomotor black lever incorrectly positioned
• 2nd stage solenoid-valve on nozzle holder not opening
• Fuel leaking out of pistons 3)(Fig. 29) preventing them from opening
• Oil pressure switch 7)(fig.4) tripped
• High or low point thermostat tripped
• Pump or fan motor thermal relays tripped
• Flame detachment due to poor atomising or excessive air
• Dirty or misshapen nozzle
• Incorrect spray angle
• Incorrectly adjusted combustion head
• Insufficient air for combustion
• Low oil temperature
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GB