420010239601 M ul t i c al or 45 ÷ 140 PR/ PR
EN
M AI N TEN AN CE
YEARLY CH ECKS
The burner's periodical check (firing head, electrodes etc.) must be carried out by authorised personnel one or two
times per year, depending on the utilisation. Before going on with the maintenance controls of the burner, it should be
advisable to check its general conditions, according to the following steps:
Unplug the burner; close the fuel cock; shut down the gas supply; remove burner's cover and clean the fan and air
intake; clean the firing head and check the electrode's position; reassemble all the parts; check the connection's sealing;
check the chimney; start the burner and check the combustion flue (CO2 = 9.5 ÷ 9.8; O = lower than 75 ppm).
BEFO RE EVERY I N TERVEN TI O N CH ECK:
The electric system is duly powered and the burner is plugged in.
The gas pressure must be the suitable one and the gas cock open.
The control devices must be properly connected.
When all the above conditions are met, start the burner by pressing the lockout enable pushbutton.
Check the burner's cycle.
TH E BU RN ER D O ES N O T START:
Check the ON/OFF switch, the thermostats, the motor and the gas pressure.
The master switch is in position "0". Fuses are blown out.
The control box is faulty.
TH E BU RN ER RU N S TH E PREPU RG I N G AN D SW I TCH ES TO LO CKO U T AT TH E EN D O F CYCLE:
Check the fan and the air pressure.
Check the air pressure switch.
Control box faulty. Ignition transformer faulty.
Check the ignition cable. Electrodes are dirty or in wrong position.
Nozzles are clogged or worn. Filters are clogged. Light-oil pressure is too low.
Combustion air's flow rate too high related to nozzle output.
TH E BU RN ER RU N S TH E PREPU RG I N G BU T D O ES N O T I G N I TE:
Check the position of the electrodes; check the ignition cable;
Check the ignition transformer;
Check the control box.
TH E BU RN ERS I G N I TES BU T SW I TCH ES TO LO CKO U T AFTER TH E SAFETY TI M E:
Check phase and neutral for a correct connection.
Check gas solenoid valve.
Check the position of ionisation probe and its connection.
Check the control box.
Check nozzles (clogged or worn).
The photoresistor does not detect the flame.
The filters are clogged. Light-oil pressure too low.
Combustion air's flow rate too high related to nozzle output.
TH E BU RN ERS I G N I TES BU T SW I TCH ES TO LO CKO U T AFTER FEW M O M EN TS:
Check gas governor and gas filter.
Check gas pressure through a manometer.
Check ionization value (min. 200 µA).
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