Unigas RG91 Manual Of Installation - Use - Maintenance page 21

Correct position of electrodes and combustion head
AR
VRT
R
ATTENTION: avoid the electrodes to get in touch with metallic parts (blast tube, head, etc.), otherwise the boiler operation
would be compromised. Check the electrodes position after any intervention on the combustion head.
To guarantee a good ignition the measures showed on the next picture Fig. 12 must be observed.
Be sure to tight the screw on the electrodes group before reassembling the combustion head.
A 9 ÷ 11 mm
B 3.5 ÷ 4.5 mm
C 8 mm
D 3 mm
C
Fig. 12
21
E
Fig. 11
PART III: MAINTENANCE