AIR PRESSURE SWITCH
The air pressure switch stops the equipment operation if air pressure
is not at the expected value.
The pressure switch must therefore be adjusted so that it is triggered
to close the NO (normally open) contact when the air pressure in the
burner reaches a particular value.
If the air pressure switch does not detect a pressure greater than that
calibrated, the equipment runs through its cycle but does not switch on
the ignition transformer and does not open the gas valves and so the
burner “locks-out”.
To ensure correct operation of the air pressure switch you must, with
burner on and in 1st stage, increase its regulation value until the burner
triggers and then it immediately “locks-out”.
Release the burner by pushing the appropriate button and readjust the
pressure switch to a sufficient value to detect the existing air pressure
during the pre-ventilation phase of the first stage.
Air pressure sampling point is downstream the air damper.
Adjust the setting of the pressure switch to a level slightly below the
actual air pressure detected in first stage operation. Release the bur
-
ner and check that it starts up correctly.
GAS CONTROL PRESSURE SWITCHES
The gas pressure control switches (minimum and maximum) prevent
the burner from operating when gas pressure does not lie between the
expected range.
The minimum value pressure switch makes use of the NO (normally
open) contact which is closed when the pressure switch detects a pres-
sure higher than its own setting.
The maximum pressure switch uses the NC (normally closed) contact
that is closed when the pressure switch detects a pressure lower than
the value it is set to.
Adjustment of minimum and maximum pressure values on the pressu
-
re switches must be performed when testing the burner, on the basis of
the pressure measured in each case.
The triggering (opening of the circuit) of any of the pressure switches
when the burner is running (flame on) locks out the burner immediately.
When first switching on the burner it is essential to check that they
work properly.
IMPORTANT
In case only one pressure switch is installed on the gas train, it
must be a pressure switch for minimum pressure.
FLAME DETECTION CURRENT
The minimum flame detection current value required for a correct ope
-
ration of the equipment is indicated in the wiring diagram.
The burner provides a significantly higher current and therefore does
not normally require any checks at all.
If flame detection current has to be measured, it is necessary to con
-
nect a microammeter in series to the photocell cable.
BT 3..
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Summary of Contents for TBML 80 ME
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