Unigas HR92A, Manual Of Installation - Use - Maintenance

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PART IV: MAINTENANCE
48
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

Clean and examine the gas filter and replace it if necessary.

Clean and examine the oil filter cartridge and replace it if necessary.

Examine the flexible hoses and check for possible leaks.

Check and clean if necessary the oil heaters and the tank, according to the fuel type and its use; remove the heaters flange fixing
nuts and remove the heaters from the tank: clean by using steam or solvents and not metallic things.

Remove and clean the combustion head.

Examine and clean the ignition electrode, adjust and replace if necessary.

Examine and clean the detection probe, adjust and replace if necessary.

Examine the detection current.

Remove and clean the heavy oil nozzle (Important: use solvents for cleaning, not metallic tools) and at the end of the mainte-
nance procedures, after replacing the burner, turn it on and check the shape of the flame; if in doubt replace the nozzle. Where the
burner is used intensively it is recommended to replace the nozzle as a preventive measure, at the begin of the operating season.

Clean and grease joints and rotating parts.
IMPORTANT:Remove the combustion head before checking the ignition electrode.

Remove and clean the compressed air regulator

Remove and clean the oil regulator (if provided)

1 Close the bowl valve before the self cleaning filter
2 Switch off any electrical equipment on board on the filter (example motorization or heaters)
3 Disconnect the outlet pipe from the cover of the self cleaning filter
4 Remove the cover with all the filter pack, leaving only the bowl on the line
5 Clean any residue on the bottom of the bowl and clean the seat of the O-ring seal
6 Insert the filter pack again making sure to respect the correct inlet/outlet direction or any references on the cover and tray
7 Replace the filter by following the reverse order operations
8 Make sure there is no leakage and give the power to any electrical equipmente on the filter
CAUTION: avoid the contact of steam, solvent and other liquids with the electric terminals of the resistor.
On flanged heaters, replace the seal gasket before refitting it.
Periodic inspections must be carried out to determine the frequency of cleaning.
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.
Thecnical procedure of self cleaning filters substitution (valid for all models)
WARNING! Drain the system by unscrewing the drain screw on the bottom of the self cleaning filter
WARNING! Replace the O-ring seal between the bowl and cover
PART IV: MAINTENANCE