Lennox BAC 030 SNM 3M Installation, Operating And Maintenance Manual page 57

GAS BURNERS
Gas burner troubleshouting
If faults reported on CLIMATIC™
• reset the CLIMATIC™.
• check voltage: 230v after circuit breaker.
• check gas isolation shut-off valves are open.
• check gas pressure at the inlet of the gas valves. It must be >20 mbar when the burners shut down.
• adjust the set points to priorities the burner. Increase the value of the room temperature set point to a temperature higher than
actual room temperature.
Stage Normal operation
Green, yellow & red
Heating requested
l.e.d. ON
Extraction fans are
L.e.d on
running
After 30 to 45 seconds:
pre-ventilation the
Extraction fan is on
fi re-up electrode should
spark.
Continuous ventilation
After a few seconds the
and sparks from fi re up
gas burner fi res-up
electrode.
BALTIC-IOM-0412-E / Service manual
Diagnostic table baltic gas burner
Possible fault
All l.e.d. OFF
→ fault on the blower
thermostat
Yellow & red l.e.d. OFF
→ lack of gas supply
Red l.e.d. OFF
→ fault on the superheat
thermostat on the gas burner
support bar
After 10 seconds safety
shutdown by the ignition
control block
Nothing happens
Continuous ventilation without
sparks from fi re-up electrode
After 4 seconds the gas
burner still not operating
and safety shutdown by the
ignition control block.
Within 4 seconds the gas
burner fi res-up but safety
shutdown from the ignition
control block.
Action
Check connections on the
blower thermostat.
Check valve's opening &
supply pressure
Check thermostat's operation
after manual reset
Check connections of the
control block on the gas valve
Check impedance of electro
valve's coils: (1) = 2.90kΩ; (2)
= 1.69kΩ
Check the free movement of
the fan wheel
Check electrical connection
on the gas ignition control
block and on ef connection
board
Check the fan supply voltage
Check the fi re-up electrode
Check the pressure drop at
the pressure switch: it must
be higher than 165 pa
+check the good operation of
the pressure switch using an
ohmmeter and by artifi cially
creating a depression in the
tube.
Check injection pressure
during start-up (value for high
heat)
Remove the control box from
the gas block.
Check the position and
connection of the ionisation
probe. It must not be earthed
(230v).
Check that r.c circuit of the
gas burner's transformer is
well connected to the neutral
polarity
Measure the ionisation
current: it must be higher than
1.5 microamps.
Check the type of gas.
Possible solution
Replace thermostat
Restore gas supply
Replace thermostat
repositioning of the control
block on the valve
Replace valve
Replace fan
Replace ef connection board
if necessary
Re-position the pressure
switch tube.
Change the pressure switch.
Remove the air from the gas
pipe-work
Adjust the injection pressure
to high heat value.
Change the control box if the
gas valve is ok.
Check the whole electrical
supply.
Adjust the supply and
injection pressure if gas is
different from natural gas g20
:( g25 gas of groningue for
example).
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