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.
ROUTINE MAINTENANCE
Check and clean the filter inside the gas valves group (see next paragraph);
remove, check and clean the combustion head (see page 26);
check the ignition and detection electrodes; clean and adjust and, if necessary, replace them (see page 27);
in case of doubt, check the detection circuit once the burner has started up, referring to the diagram on page 27.
Check and grease of sliding and rotating parts.
NOTE: The check on the ignition and detection electrodes is carried out after removing the combustion head.
Removing the filter in the MULTIBLOC DUNGS MB-DLE 405..412
Check the filter at least once a year!
Change the filter if the pressure difference between pressure connection 1 and 3 (Fig. 16-Fig. 17)is
p > 10 mbar.
Change the filter if the pressure difference between pressure connection 1 and 3 (Fig. 16-Fig. 17) is twice as high compared to the last
check.
You can change the filter without removing the fitting.
1
Interrupt the gas supply closing the on-off valve.
2
Remove screws 1 ÷ 4 using the Allen key n. 3 and remove filter cover 5 in Fig. 18.
3
Remove the filter 6 and replace with a new one.
4
Replace filter cover 5 and tighten screws 1 ÷ 4 without using any force and fasten.
5
Perform leakage and functional test, p
max.
= 360 mbar.
6
Pay attention that dirt does not fall inside the valve.
WARNING: ALL OPERATIONS ON THE BURNER MUST BE CARRIED OUT WITH THE MAINS DISCONNECTED
AND THE FUEL MANAUL CUTOFF VALVES CLOSED!
ATTENTION: READ CAREFULLY THE “WARNINGS” CHAPTER AT THE BEGINNIG OF THIS MANUAL.
Fig. 16
Fig. 17
Fig. 18
PART III: MAINTENANCE
➞
1
0
5
3 4
5
3
4
6
6
➞
2
1
3
p
e
0
4
p
a
5
p
Br
0
3
p
e
4
p
a
6
1
5
p
Br
2
