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Nozzle Care and Service Tips |
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| Until
installation, keep nozzles in their original containers
and preferably in a suitable box or rack. They should not be permitted to
roll around in a drawer or toolbox, or carried loose in pockets. On service
calls, they should be kept in a clean nozzle box.
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Handle
the nozzle carefully
after removing from its individual container. Pick it up by the hex flats
and by all means avoid touching the filter or strainer with greasy hands.
This can force foreign material into the nozzle where it can finally work
its way into the slots. The possibility for problems is even greater with
nozzles of lower flow rates since they have smaller slots...easier to clog. |
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| Nozzles
should always be handled with clean tools...
again to reduce the possibility of contamination. To properly service a
nozzle and check its performance, it's recommended that you use a pressure
gauge, vacuum gauge, a nozzle changer and flame inspection mirror.
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Be
sure the strainer or filter is in place
on the nozzle before installation. Do not disassemble the nozzle before
installing it because great care has been taken to make sure the nozzle
is absolutely clean on the delivery. |
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VERY
IMPORTANT!
Before installing a new nozzle, it is very important to flush the nozzle
line and adapter
with at least a pint of oil pumped through it to remove sludge and dirt.
Or you can blow out the line with compressed air if it's available. Failure
to do this has been the reason for numerous callbacks for plugged nozzles.
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The
nozzle orifice is polished to a glasslike finish.
Don't ruin it with a wire or pin, or by bumping it with a wrench. This can
cause streaks i the spray. |
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| Don't
blow into the nozzle.
While this may seem to be the handiest and quickest way to "clean"
a nozzle, you run the risk of contaminating it instead.
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A
nozzle can become overheated due to back pressure in the combustion chamber.
This
results in coke and sludge formation both inside and outside of the nozzle.
To correct this problem, set the over fire draft for at least .02 inches
of water column or follow furnace or boiler manufacturer's specifications. |
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| On
a conventional installation, be sure the end of the burner tube is flush
or slightly set back
with the inside wall of the combustion chamber to prevent the nozzle from
becoming overheated. Follow manufacturer's specifications when available.
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Make
sure the fuel tank is clean.
Water and sludge in the tank can clog lines, filter or nozzles. |
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| Be
sure the supply line filter (between tank and burner) is adequate for
the size of nozzle used.
It will remove many of the small particles which may be present in the
fuel oil or formed in the tank. Filtration is particularly recommended
for burners using small nozzles. The filtering element should be replaced
at each summer cleanup and the line flushed out with oil. The Delavan
line filter should also be replaced annually.
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| Nozzle
Cleaning -
A quality nozzle should last through a normal heating season provided that
an excellent to superior grade filtration system is used. A Delavan nozzle
is a fixed precision metering device with no moving parts. When not overheated,
there have been cases where a nozzle has worked several heating seasons
trouble free. However, most service organizations have shown that the best,
most economical results can be obtained by replacing nozzles annually. To
clean a nozzle properly is a painstaking, time-consuming job. And in the
lower flow rates, it's practically impossible to see whether the orifice
and distributor slots are thoroughly clean without the aid of a microscope.
Also, disassembly of, or tampering with the nozzle will void the manufacturer's
warranty. In the long run, you will save your time and the customer's money
by a program of nozzle replacement. |
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