MEASURES AND CHECKS BEFORE START-UP,
General rules
Care should be taken by the installer
to ensure that no electrical cables or
fuel/gas pipes are trapped or damaged
during installation or service/mainte-
nance.
Inner assembly
Ensure that the ignition and ionisation
electrodes are correctly adjusted. The
sketch shows the correct measure-
ments.
Gas quality
Ensure that the burner head is meant
for the gas quality to be used (see ig.)
Venting
The gas line is vented by loosening the
screw on the test nipple for the inlet
pressure. Connect a plastic hose and
conduct the gas into the open.
After
having vented the gas line tighten
the screw again.
Leakage control
When making a leakage control of the
gas supply system the solenoid valve
should be closed. Connect a pressure
gauge to the test nipple Pa, see ig.
The test pressure in the system should
be 1,5x max. inlet pressure or min.
150 mbar. If any leakage, locate the
source by means of soapy water or
a leak location spray. After tightening
repeat the test.
Electric function test:
Ensure that phase and neutral are
not reversed. The gas shut-off cock
should be closed.To prevent the gas
pressure switch from locking out it
should be linked temporarily.
After the main switch has been
switched on and the thermostats have
been adjusted the pre-purging period
begins (30-35sec.). At the end of this
period the pre-ignition period starts
(0,5-2,5 sec. dependent on the design
of the gas control). The gas valve is
energized and opens and lame is
established. At the end of the safety
time (2-3 sec.) the gas control locks
out. The solenoid valve and the motor
will be "dead". Remove the link from
the gas pressure switch after the test
is inished.
172 205 34 07-01
Leakage control
Gas train
Note on 2-stage and modulating burn-
ers that during the pre-purging period
the damper opens to the set value for
air on stage 2 and just before the end
of the pre-purging period it goes down
to the air setting for stage 1. On some
burners under 350kW the pre-purging
mainly takes place with the air damper
set for stage 1.
NOTE! Applies only to gas burner
control LFL1.
When using LPG (Propane) the burner
should be connected for post-purge.
Move connection to terminal 6 to ter-
minal 7 in the base of LFL1.
2-STAGE- OR MODULATING BURNERS
MultiBloc
172 505 03 08-01
Flow adjustment 2-stage design
For stage 1,
loosen the lock screw
a. Turn the hydraulic device e:
to the right = the gas low is reduced
to the left = the gas low is increased
For stage 2,
turn the hydraulic
device b:
to the right = the gas low is reduced
to the left = the gas low is increased
Do not forget to tighten the lock
screw again.
ADJUSTMENT OF MULTI-BLOC, MB-ZRDLE 405-420
Adjustment of governor
Adjust outlet pressure from governor
by means of a screw driver. Min. and
max. outlet pressures correspond to
appr. 60 turns of the spring. It is not
possible to change pressure springs in
order to change the outlet pressure.
Turn to the right = the outlet pressure
is increased
Turn to the left = the outlet pressure
is reduced
Adjustment of start gas low
Remove the protective cover c.
Turn the adjustment knob d (use the
protective cover as a tool) to the de-
sired start gas low.
Turn to the right = the start gas low
is reduced
Turn to the left = the start gas low is
increased
Adjustment of governor
Multi-bloc MB-ZRDLE 405-420
Adjustment of start gas low
Flow adjustment
2(2)
