NDFL100-38 / BR003211 / Rev. 220900A
Page 28
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Incorrect Rotation of Burner Motor
The Fan Motor rotates clockwise viewed from the
shaft end. If the rotation is incorrect, interchange
any two phases.
Burner Motor Fails to Start
Check:
that the electrical supply is available and the
burner is correctly wired
all fuses for continuity and size
all control instruments are calling for heat
the MPA control is not locked out
Gas firing only:
The gas supply is not isolated
There is sufficient gas pressure
The gas pressure switch is correctly set
Motor starts but burner will not light
If the flame is not established the burner will lock-
out.
Check :
The air setting is correct.
All connections including high voltage leads,
with mains switched off.
That there is an arc at the electrodes.
The electrode gap and correct if necessary,
see page 6.
That the electrodes are not short-circuited
and that the insulators are not cracked or
soiled.
Gas firing only:
There is sufficient gas under ignition
conditions
The gas valve(s) operate correctly
Oil firing only:
Whether the nozzle is spraying oil. If not
check that there is an oil supply to the burner
and that all isolating valves are open
That nozzle is not blocked and that atomisa-
tion is correct
That all filters are able to pass oil
That the oil solenoid valve opens
That fuel pressure delivered by the pump is
correct
Burner Fails to Establish Main Flame - Gas
firing only
Check:
The gas butterfly is operating correctly
The combustion air is set correctly
There is sufficient gas
Unstable pump pressure - Oil firing only
On suction lift systems, check that the pump
has been correctly primed by disconnecting
return pipe from pump. Air-free fuel should
flow out when the pump is run.
Check that all pipework and connections on
the suction side are free of leaks and that
there are no blockages.
Check internal by-pass plug is fitted to pump,
Check that there is a suitable spring-loaded
non-return valve is fitted.
On gravity feed systems, remove the purge
plug to ascertain that air-free oil flows out
(do not run motor).
Burner fires then locks out - Oil firing only
Check:
That photocell is clean and correctly located.
That the air damper and burner head setting
are correct and re-adjust as necessary.
Burner fails change to high flame - Oil firing
only
Check:
The settings and operation of the controlling
instruments. Check that the high/low
magnetic valve is opening.
That there is high flame signal from control
box.
