Ambirad Tornado 600 Посібник з експлуатації, технічного обслуговування та ремонту - Сторінка 11
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7 Fault finding
Symptoms
Burner will not start
Red 'mains on' does not illuminate.
Red light illuminates.
Fan starts but burner does not attempt ignition. Insufficient vacuum generated by fan.
Burner proceeds to ignition stage (normally
indicated by audible spark valve energised
and 'burner on' light illuminated) but burner
does not light.
Burner lights but shuts down after a few
seconds.
Heater shuts down after operating for a period Refer to above.
of time.
Possible causes
Incorrect voltage selected
Overheat thermostat tripped.
External controls, thermostats, time switch etc.
not calling for heat.
Loose electrical connection.
Fan seized or faulty motor.
Sequence controller relay failing to pull in and/
or hold in.
Vacuum switch not returning to normal (switch
off) position.
Combustion chamber cover permitting air
leakage.
Vacuum impulse line between combustion
chamber and vacuum switch insecure
or defective.
Vacuum switch 'pulls in' but electronic sequence
controller does not proceed to programme
ignition sequence.
No spark.
Gas safety valve faulty or defective.
Insufficient gas pressure.
Inadequate flame signal. This can be verified
by connecting a sensitive micrometer in
series with the violet wire which passes through
the combustion chamber bulkhead. The correct
reading should be 5µA ± 1µA.
Flame unstable.
Inadequate gas supply. Observe burner
gas pressure with all heaters operating.
Insufficient vacuum at combustion chamber
causing vacuum switch to cut off.
Remedy
Check outlet and inlets are not obstructed. Check
fan speed. If problem persists replace thermostat.
Adjust controls.
Check all connections.
Replace fan, recommission heater, checking gas
pressure settings.
Check vacuum switch is satisfactory, replace
sequence controller.
Replace vacuum switch.
Clean fan blades with soft bristle.
Examine condition of sealing gasket, tighten
down lid securely.
Fix securely in place.
Replace burner sequence controller unit but first
check that the cause of failure is not a short on
output circuit, by measuring resistance between
pins 2 and 7 of burner control unit plug. A
reading of 10,000 ohms indicates short circuit on
gas valve burner indicator light or associated
wiring.
Check electrode for cracks – replace if necessary.
Check high tension connections are secure.
Check spark gap is 3.5 ± 0.5mm. If no high tension
output from electronic controller, replace
controller.
Replace solenoid operator section of gas valve.
Set burner pressure to that indicated on data
badge (see commissioning).
Replace electrode. Check connections to electrodes
and terminal 4 of electric sequence controller plug
Replace the electronic sequence controller.
Check cleanliness of burner and set burner
pressure as indicated on data badge.
If gas pressure drops below that indicated on
the data badge, examine gas supply pipework
for excessive pressure loss.
Clean fan blades with soft bristle brush.
Inspect tube internally and clean if necessary
(see servicing instructions).
If problem persists, replace vacuum switch.
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