Maintenance
dreizler A 3001 E - 18.12.2015 | A 2044 - 1.15 | EN - 18.05.2015
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53 Maintenance
WARNING!
Prior to any maintenance or service work, the gas ball tap at the burner supply line must be closed.
Block off the burner of the power supply. (Even with the main power switch in OFF position, the burner
power supply line remains live!)
NOTICE:
In compliance with EN 676, an annual maintenance of the gas fire system is mandatory. The entire system
is to be checked for correct functionality and any deficiencies detected must be repaired immediately.
53.1 Maintenance work
Clean the combustion air blower and mixing device of any dust, fibers and other residue.
Check the ionisation and ignition electrodes for position, gap and scaling.
Measure the ionisation current.
Open the gas filter and clean it if required.
Check the air pressure switch and gas pressure switch for proper function.
Recheck all configuration values and compare these with the log entries of the last check.
Check gas tightness.
Prior to final handover of the test log and delivery to the client, all thermostats must be checked in re-
peated switching cycles.
All fixing and clamping parts on the fittings must be checked for tight seating and retightened if required.
53.2 Reference values for starting torque
53.2.1 Starting torque of srews
The table contains reference values in Nm for screws with metric thread and strength 8.8. The lower values
apply for the contact surfaces steel - gasket, and the upper values apply for the contact surfaces steel -
steel. The starting torque can be determined by way of a torque wrench.
Tab. 53-1 Reference values for starting torque of screws
The reference values for the starting torque on terminals and connectors are between 0.8 to 1.5Nm.
53.2.2 Starting torque of threaded plugs
The table contains reference values in Nm for screw-in threaded plugs.
The reference values apply only when using liquid sealant which are authorized by the DVGW. For all other
imperial threaded joints the prescribed screw-in depth must be respected.
Tab. 53-2 Reference values for starting torque of threaded plugs
Thread
M4
M5
M6
M8
M10
M12
M14
M16
Nm
3,5 - 4,5 4,5 - 10
7 - 16
16,5 - 24,5
17,5 - 38 22,5 - 42,5 23,5 - 47,5 30 - 50
Thread:
1/4"
1/2"
Nm
30
50
