PART III: MAINTENANCE
55
TROUBLESHOOTNG GUIDE Light oil operation
BURNER DOESN'T LIGHT
* No electric power supply
* Wait for electric power supply is back
* Main switch open
* Close the switch
* Thermostats open
* Check set points and thermostat connections
* Bad thermostat set point or broken thermostat
* Set or replace the thermostat
* No gas pressure
* Restore gas pressure
* Safety devices (manually operated safety thermostat or pressure switch,
and so on ...) open
* Restore safety devices; wait that boiler reaches its temperature then
check safety device functionality.
* Broken fuses
* Replace fuses. Check current absorption
* Fan thermal contacts open (only three phases)
* Reset contacts and check current absorption
* Burner control locked out
* Reset and check its functionality
* Burner control damaged
* Replace burner control
BURNER LOCKS OUT WITH FLAME
PRESENCE
* Flame detector dirty or damaged
* Clean or replace flame detector
* Burner control damaged
* Replace burner control
* Smoking flame
* Reset combustion air flow rate
* Check the nozzle and, if necessary, replace it
* Check cleanness of combustion head
* Check chimney suction
* Check boiler cleanness
* Combustion head dirty
* Clean combustion head
BURNER LOCKS OUT WITHOUT ANY
FUEL FLOW RATE
* No fuel
* Fill the tank
* Pump joint broken
* Check pump pressure
* Pump damaged
* Check pump suction
* Replace pump
* Compressed air (or steam) too high
* Released compressed air (or steam) pressure
* Oil metering valve not open far enough
* Check air pressure
* Check servomotor position
* Oil valve not energized
* Check wiring path or replace valve
* Fan motor not efficient
* Adjust or replace the motor
* Fan or pump motor runs in the wrong way
* Change rotation
* Obstructed nozzle
* Clean or replace the nozzle
* Check valve in the tank locked or leaking
* Clean or replace the valve
* Oil filter dirty
* Pump filter dirty
* Clean filter
* Solenoid valve dirty or broken
* Clean or replace solenoid valve
BURNER LOCKS OUT WITH FUEL FLOW
RATE (NO FLAME)
* Oil pressure too low
* Reset oil pressure
* Nozzle dirty or damaged
* Clean or replace nozzle
* Water in the tank
* Take off all the water from the tank
* Clean all filters
* Suction too high
* Check suction before pump. If necessary clean filters.
* Ignition electrodes grounded because dirty or damaged
* Clean or replace electrodes
* Ignition electrodes badly set
* Check electrodes position referring to instruction manual
* Cables damaged
* Replace cables
* Bad position of cables in the ignition transformer or into the electrodes
* Improve the installation
* Ignition transformer damaged
* Replace the transformer
PUMP TOO NOISY
* Suction too high (over 0,35 bar) (dirty filters, check valve in the tank locked,
and so on ...)
* Clean filters
* Replace check valve in the tank
* Flexible hoses damaged
* Replace flexible hoses
* Air infiltration in the pipes
* Take off all infiltration
* Pipe too long or too narrow
* Increase line size
BURNER RUMBLES WHEN MODULA-
TING TO HIGH FIRE
* Burner is too lean
* Adjust air-oil ratio
* Drawer assembly not set properly
* Check drawer position
* Oil may be too hot
* Check oil temperature
* Flame is blowing off head
* Check head position
CARBON BUILD-UP ON THE FIRESIDES
OF THE BOILER
* Oil flame not retaining to head
* Dirty nozzle
* Clean the nozzle
* Oil spray impinging on burner head
* Check position of the nozzle respect to the head
* Spray angle of the nozzle too wide
* Reduce spray angle
FLAME IRREGULAR OR SPARKING
* Oil pressure at nozzle too low
* Reset oil pressure
* Air flow rate too high
* Adjust air flow rate
* Oil is too cold
* Adjust oil temperature
* Dirt in the oil
* Check filters
* Water in the fuel
* Take off all the water
* Oil impingement on the combustion head
* Drawer assembly far too rear
* Nozzle is not protruding through centerhole of air diffuser
* Oil flame not retaining to the head
* Nozzle dirty or damaged
* Clean or, if necessary, replace the nozzle
BURNER LIGHTS BUT FLAME DOESN'T
RETAIN TO BURNER HEAD
* Drawer assembly not positioned correctly
* Move forward or backward
* Nozzle too far forward through centerhole of diffuser
* Move nozzle backward respect to diffuser
* Oil or air pressure at nozzle is too low
* Increase oil or air pressure
* Air louver too open
* Reduce air louver opening
* Too much spread between oil and air (or steam) pressure
* Set the spread to a proper value
FLAME IRREGULAR OR SMOKING
* Not enough combustion air
* Adjust air flow rate
* Nozzle dirty or damaged
* Clean or, if necessary, replace the nozzle
* Flame is too big for furnace or nozzle spray angle is wrong
* Check burner-furnace coupling
* Change nozzle with a suitable one
* Nozzle spray angle wrong (flame too long or too wide)
* Replace nozzle
* Boiler dirty
* Clean the boiler
* Not enough suction at chimney
* Check chimney cleanness or size
* Pressure at nozzle too low
* Reset oil pressure
* Oil too cold
* Reset oil temperature
* Combustion air inlet dirty
* Clean the air inlet
* Flame is too small respect to furnace volume
* Replace nozzle or reset pump pressure
FUEL GAS TEMPERATURE TOO HIGH
* Boiler dirty
* Clean the boiler
* Oil flow rate too high
* Adjust oil pressure or replace nozzle
Summary of Contents for HTLX92R
Page 57: ...Siemens LMV5x Service Manual M12920CC rev 2 1 08 2017...
Page 64: ...8...
Page 68: ...12 2 2 LMV5x program structure...
Page 95: ...39...
Page 102: ......
Page 103: ......
Page 104: ...Note Specifications and data subject to change Errors and omissions excepted...
Page 106: ...Annex1 Example for motor cable...
Page 107: ......
Page 108: ...Annex 2 Example for sensor cable...
Page 109: ......
Page 110: ......
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