Unigas P20, Installation, Operation And Maintanance Manual, Page: 25 / 52

PART II: OPERATION 25
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.
PERIODICAL OPERATIONS
!
Cleaning and examining the gas filter cartridge, if necessary replace it; (see on page 18);
!
Removal, examination and cleaning of the combustion head (see Fig. 42 - Fig. 43);
!
Check of ignition electrode, cleaning, adjustment and, if necessary, replacement (see Fig. 44 - Fig. 45);
!
Check of detection electrode, cleaning, adjustment and, if necessary, replacement (see Fig. 44 - Fig. 45); if in doubt check
the detection circuit as shown in Fig. 46 - Fig. 47, with the burner in operation;
!
Cleaning and greasing sliding and rotating parts.
Removal of the combustion head
N.B. All operations on the burner must be carried out with the power disconnected
NOTE: The check on the ignition and detection electrodes is carried out after removing the combustion head.
Fig. 42 - Burners P20 - P30 - P45 - P50
!
Remove the lid C.
!
Unscrew the 2 screws S which hold in
position the washer, unscrew then the
screw VRT, to free the threaded rod AR.
!
Unscrew the screws V which lock the gas
manifold G and extract the complete unit
as shown in the figure.
Note: for subsequent assembly carry out the
above described operations in the reverse
order, having care to keep the OR ring in the
correct position.
Fig. 42
Fig. 43 - Burners P65
!
Remove the lid C.
!
Unscrew the 2 screws V which hold in
position the washer G and remove the
complete set as shown in figure.
Note: for subsequent assembly carry out the
above described operations in the reverse
order, having care to keep the OR ring in the
correct position.
Fig. 43
PART II: OPERATION
VRT
S
OR
AR V G C
OR
V G C
VRT
AR