User Guide

32
If the burner sometimes fails to ignite smoothly
and starts with a puff, what can be done to
improve it?
1. Check the electrode points for proper spacing. The points
should be 1/8” to 3/16” apart, 9/16” above the centerline of
the nozzle and then spaced correctly forward from the face of
the nozzle for each different spray angle.
2. Clean carbon and dirt from the points and from the
insulators.
3. The transformer may be weak and not delivering full voltage
or current. If you don’t have another transformer
immediately available, file the electrodes to a sharp point.
This will give a better spark.
4. Check for cracked insulators. Sometimes an insulator may be
cracked under the electrode bracket and it is difficult to find.
This could cause a high voltage leak, thus reducing the
voltage at the points.
5. A partially plugged nozzle causing off-center spray can
cause delayed ignition.
6. Above about 2.50 gph a hollow cone spray sometimes may
cause delayed ignition. Changing to a solid cone sometimes
helps that situation.
7. The air setting on the burner may be wide open, thus tending
to blow the fire out before it is established. Adjust the air
correctly.
I have tried firing fractional gallonage nozzles
and they only work two or three weeks and
plug up. Does everyone have that same
problem?
1. Fractional gallonage nozzles have become a very popular
nozzle and are giving good satisfaction if properly used. First
of all, do not remove a nozzle from its vial before you are
ready to install it in the burner. That may contaminate it.
2. Be sure an adequate supply line filter is installed. This size of
nozzle should have a filter capable of removing particles
over 50 microns. The problem is to know which filter will do
that. Generally speaking, the paper filters are finer than the
felt or woven filters that are generally available.
3. Install a Delavan line filter for extra nozzle protection. Make
sure all trapped air is removed and follow installation
instructions.
4. The Delavan Del-O-Flo nozzle may help. It was designed
especially to minimize the usual plugging problems
associated with low flow rates.
5. Flush or blow out the nozzle line and adapter before
installing the nozzle.
6. If the nozzle runs exceptionally hot, find out why and
remove the cause.