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14) The control pressure switches for the gas (minimum) are to
prevent the working of the burner when the pressure of the
gas is not as provided for. It is clear from the specific function
of the pressure switches that the control pressure switch for
minimum pressure must make use of the contact that is closed
when the pressure switch detects pressure greater than that
for which it is regulated. The adjustment of the minimum gas
pressure switch must therefore be carried out when the burner
is started up, in accordance with the pressure that is found at
the time. The triggering (i.e. the opening of the circuit) of any
of the pressure switches when the burner is running (flame on)
causes the burner to stop immediately. When first switching
on the burner it is essential to check the correct working of the
pressure switch.
15) Check the triggering of the flame detector (ionisation electrode).
Disconnect the jumper between terminals 30 and 31 on the
printed circuit board and switch on the burner. The equipment
must run through its cycle completely and, three seconds after
the ignition flame has formed, “lock-out”. This check must also
be carried out when the burner is already on. Disconnecting
the 30 and 31 jumper, the equipment must immediately go into
its “lock-out” action.
16) Check that the boiler thermostats or pressure switches are
operating correctly (they must cause the boiler to shut down
when they intervene).
!
Check that the ignition takes place properly. In the event
that the mixer is too far forward, it may happen that the
speed of the delivery air is so high that ignition is difficult.
If this happens, the mixer must be shifted back by degrees
until it is in a position in which ignition occurs normally, and
this new position can be regarded as the final position.
We remind you that is preferable, in the case of the small
flame, to limit the quantity of air to the lowest amount pos
-
sible needed for safe ignition, even in the most difficult
circumstances.
IONISATION CURRENT MEASUREMENT
To measure the ionisation current, remove the jumper between
terminals 30-31 on the printed circuit board with the burner off.
Connect a microampmeter with a suitable scale to the terminals
and restart the burner. Once the flame has appeared it will be
possible to measure the ionisation current, the minimum value
of which ensuring the operation of the equipment is shown in the
specific wiring diagram. After making the measurement, reset the
jumper that has been disconnected.
Equipment and
programmer
Safety
time
Preventilation
time
Pre-
ignition
Post-ignition
Time between opening
of 1st flame valve
and 2nd flame valve
Air shutter open
-
ing stroke time
Air shutter clos
-
ing stroke time
LME 22.331A2
3
30
2
2
11
12
12
LME 22.233A2
3
30
2
2
11
30
30
CONTROL EQUIPMENT AND COMMANDS FOR GAS BURNERS LME 22...
Summary of Contents for TBG 45 PV
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