Unigas RX90 Installation Manual page 42

Removing the combustion head
Attention: before adjusting the combustion head, turn the burner off and wait until it gets cold.
Remove the cover C.

remove the electrodes cables;

unscrew the 3 screws V which hold in position the gas manifold G and pull out the complete group as shown in the picture below.

Clean the combustion head by a compressed air blow or, in case of scale, scrape it off by a scratchbrush.

Note: to replace the combustion head reverse the procedure described above having care to place correctly the O ring (OR) between
burner and gas manifold.
AR V
VRT
OR
C
CAUTION (RX515-520): set the nozzles as described on paragraph "Adjusting the combustion head".
G
C
Fig. 30
Key
VRT
Head adjusting screw
AR
Threaded rod
V
Fixing screw
G
Gas manifold
OR "O" ring
C
Cover
AR
42
G