Unigas R91, Installation Manual

Page: 34 / 120

PART IV: MAINTENANCE
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5.2 Replacing the spring in the gas valve group
5.3 Removing the combustion head
To remove the combustion head ass.y, go on as follows:
1
unscrew the four fixing screws that fasten the burner cover C ;
2 unscrew the dowels that secure the head adjusting nut G
3 unscrew the head adjusting pipe T
4 push the pipe forwards, then remove it by pulling it back
5 unscrew th three screws V that secure the manifold CO
6 remove the manifold CO
7 find the electrode cable that is broken and remove it
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.
1
3
SKP Siemens actuator
G
G
T
CO
V