Unigas HTLX92R Installation Manual page 55

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