CIB UNIGAS HR1025, Manual, Page: 42 / 55

PART IV: MAINTENANCE
42
8.2 Replacing the spring in the gas valve group
8.3 Removing the combustion head
1 Remove the top
H
.
2 Remove the
UV
detector out of its housing: disconnect electrode cables and the light oil flexible hoses.
3 Loosen the screws
V
holding the gas manifold
G
, loosen the two connectors
E
and remove the assembly as shown.
Note:
to replace the combustion head, reverse the operations described above.
4 Clean the combustion head by means of a vacuum cleaner; scrape off the scale by means of a metallic brush.
To replace the spring in the gas valve group,proceed as follows:
1 Carefully twist the protection cap 1 and the O-ring 2.
2 remove the “set value” spring 3 from housing 4.
3 Replace spring 3.
4 Carefully insert the new “set value” spring. Pay attention to mount properly.
First insert the spring part with smaller diameter in the housing.
5 Place O-ring 2 in protective cap 1. Screw in the protective cap with the O-
ring in it.
6 Stick the adhesive label for spring identification on the type plate.
Key
1 Inlet
2 Return
3 Gun opening
E Oil piping connections
H Cover
L Oil gun
1
3
SKP Siemens actuator
H
E
1 2 3
L
G
V