INOV8 Model F240 – Edited September 2008
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7. The unit fires but runs badly at first, after a few minutes it has straightened out and
will run fine until the next time it is fired.
a. The OUT2 set point (Interlock) of the oil temperature controller has been
programmed too low.
b. Draft is insufficient until the chimney warms up
8. The unit fires and runs well for a short time. Then abruptly shuts off, re-fires, runs,
shuts off, etc.
a. The oil temperature is falling below the OUT2 (Interlock) set point in the oil
temperature controller. The OUT1 and OUT2 set points may have been
programmed too close together – they require at least 20 degrees separation.
9. The unit fires and (probably) continues burning but it will burn OK for a few minutes
and then poorly for a few minutes in a repeating cycle.
a. The OUT1 set point in the oil temperature controller has either been set too low
(cool oil burns poorly) or too high (oil at too high temperature will boil)
10. The unit fires (possibly only after multiple tries), may or may not run smoothly for a
while, shuts off (retries) periodically through the day and is most likely down on
alarm when you come in the following morning.
a. Air is getting in the oil stream and being vented out the nozzle
b. The oil pressure is too high
c. The oil is not hot enough to burn well
d. The oil is bad (perhaps has water in it)
e. The draft is inadequate or inconsistent
f. Particles are getting to the nozzle and blocking the spinner.
USING LIGHTS ON THE CONTROLLER TO DIAGNOSE SYMPTOMS
There are 5 lights on top of the controller. They are (and their function is):
“OPR CTRL” – This light will come on when power is applied to the burner i.e. when the
wall thermostat is turned up. It means there’s 120v on controller terminal 7.
“INTRLCK” – This light comes on (quits blinking) when the oil thermostat has reached
the OUT2 set point in the oil temperature controller. OUT2 active sends 120V to Fireye
controller terminal 6.
“PTFI” – ‘Pilot Trial For Ignition’ – comes on for 10 seconds when the burner fires. When
it is on, the ignition transformer is on and there is 120v on controller terminal 3 – which
provides power to the air and oil solenoid valves.
“FLAME” – Comes on when the U.V. sensor sees a flame (or the ignition arc). It goes off
3 seconds after the U.V. sensor stops seeing a flame.
“ALARM” – Comes on when the controller has shut the burner down abnormally. It
signals the same thing as the red alarm light by the 6-prong plug. When on, there is
120v on controller terminal “A”.
Their value comes into play primarily for failures that occur after the burner has been
running for a while and then shuts off. This, along with a failure to fire at all, comprises
the bulk of the problems reported. Other than a loss of power, there are really only three
things that cause the burner to shut off. The controller initiates the first two. The third is
due to some condition that the controller doesn’t become aware of until three seconds
after the flame has gone out. They are:
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