Unigas K890A Manual Of Installation - Use - Maintenance Download

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PART IV: MAINTENANCE

At least once a year carry out the maintenance operations listed below. In the case of seasonal servicing, it is recommended to carry
out the maintenance at the end of each heating season; in the case of continuous operation the maintenance is carried out every 6
months.

ROUTINE MAINTENANCE



Check that the gas meter is not moving when the burner is off. In case it is rotating, look for possible leaks.



Check that all parts in contact with combustive air (air box, protection mesh and Archimedean screw) are clean and free from any
obstruction that might impede free afflux. Clean it with compressed air if available and/or a dry brush or cloths. Eventually wash it
with non corrosive detergents.



Check of blast tube; it must be substituted in case of obvious cracks or anomalous holes. Slight deformations that do not affect
combustion may be tolerated



Check and clean the cartdrige of the fuel filter, replace it if necessary;



carefully check the fuel flexible hoses for leaks;



check and clean the filter on the fuel pump: bilter must be thoroughly cleaned at least once in a season to ensure correct working of
the fuel unit. To remove the filter, unscrew the four screws on the cover. When reassemble, make sure that the filter is mounted
with the feet toward the pump body. If the gasket between cover and pump housing should be damaged, it must be replaced;



remove, check and clean the combustion head;



check the ignition electrodes and their ceramic insulators, clean, adjust and replace if necessary;



remove and clean the oil nozzles (IMPORTANT: do not clean the nozzles using metallic or sharp utensils, use only solvents or
steam); at the end of maintenance operations, refit the burner, turn it on and check the combustion. If in doubt, replace the defec-
tive nozzle/s. In case of intensive use of the burner, the nozzles must be replaced at the end of the working season;



examine and clean the detection electrode/photoelement (according to the burner models), replace it if necessary, in case of
doubt, check the detection circuit, after the burner start-up;



clean and grease levers and rotating parts.



At least every 2 months, or more often if needed, clean the room where the burner is installed.



Avoid leaving installations, papers, nylon bags, etc., inside the room. They could be sucked by the burner and cause malfunctio-
ning.



Check that the room’s vents are free from obstructions.

Gas filter maintenance

WARNING: ALL OPERATIONS ON THE BURNER MUST BE CARRIED OUT WITH THE MAINS DISCONNECTED
AND THE FUEL MANAUL CUTOFF VALVES CLOSED!
ATTENTION: READ CAREFULLY THE “WARNINGS” CHAPTER AT THE BEGINNIG OF THIS MANUAL.

DANGER! Incorrect motor rotation can seriously damage property and injure people. ATTENTIONwhen servicing,
if it was necessary to disassemble the gas train parts, remember to execute the gas proving test, once the gas
train is reassembled, according to the procedure imposed by the law in force.

WARNING: Before opening the filter, close the manual cutoff valve downstream the filter and bleed the gas; check
that inside the filter there is no pressurised gas.

PART IV: MAINTENANCE

To clean or remove the filter, proceed as follows:
1 remove the cap unscrewing the fixing screws (A);
2 remove the filtering cartridge (B), clean it using water and soap, blow it

with compressed air(or replace it, if necessary)

3 replace the cartridge in its proper position taking care to place it

inbetween the guides as not to hamper the cap replacement;

4 be sure to replace the “O” ring into its place (C) and replace the cover

fastening by the proper screws (A).