Service And Maintenance Manual; Safety Section; Service And Maintain Burner - York International DFAA User's Information, Maintenance And Service Manual

TABLE 1: Filter Sizes
Blower Door Return
inches
(2) 16 x 20
Blower Care
Even with good filters properly in place, blower wheels and motors will
become dust laden after long months of operation. The entire blower
assembly should be inspected annually. If the motor and wheel are
heavily coated with dust, they can be brushed and cleaned with a vac-
uum cleaner. If the blower cannot be properly cleaned without removing
it from the furnace, then call a qualified service agency. Only a qualified
service agency can perform this service.
Make sure you DO NOT move the clip-on weight on the indoor
fan wheel when cleaning the wheel. This weight is used to bal-
ance the wheel. Moving the weight will cause the fan wheel to
vibrate.
Motor Lubrication
The motors in these furnaces are permanently lubricated, and do not
require periodic oiling.
SECTION II: SERVICE AND MAINTENANCE
MANUAL

SAFETY SECTION

This section has been designed to assist a qualified service agency in
performing service and maintenance on this appliance. The homeown-
ers and/or end user must never attempt to perform any service or main-
tenance on the appliance especially when it involves the removal or
adjustment of any parts and/or components.
The Oil Heat Manufacturers' Association supports the use of low sulfur fuels as defined by ASTM D396, Grades Number 1 Low Sulfur and
Number 2 Low Sulfur, as the preferred heating fuel for the following reasons:
• Low sulfur fuels reduce deposits on heat exchanger surfaces, which may extend the service interval between cleanings.
• The reduced deposits increase the efficiency of the appliance.
• Low sulfur fuels reduce particulate emissions.
• Low sulfur fuels reduce oxides of nitrogen emissions.

SERVICE AND MAINTAIN BURNER

Perform Annual Maintenance
This equipment must be serviced only by a qualified service
agency. The appropriate test instruments must be used. Failure
to do so could result in burner or appliance failure, causing
potential severe personal injury, death, or substantial property
damage.
• Replace the oil supply line filter. The line filter cartridge must be
replaced to avoid contamination of the fuel unit and nozzle.
• Inspect the oil supply system. All fittings should be leak-tight. The
supply lines should be free of water, sludge, and other restric-
tions.
• Remove and clean the pump strainer, if applicable. Replace the
cover gasket (or O-ring seal).
• Replace the nozzle with an equivalent nozzle.
Unitary Products Group
The following safety rules must be followed when servicing the
furnace.
cm
(2) 41 x 51
CARBON MONOXIDE POISONING HAZARD - Carbon Mon-
oxide is a colorless, odorless gas than can kill. Follow these
rules to control carbon monoxide.
• Do not use this burner if in an unvented, enclosed area. Carbon
monoxide may accumulate.
• Check flue gases for carbon monoxide. This check requires
specialized equipment.
• Allow only qualified burner service persons to adjust the burner.
Special instruments and training are required
• Read the owner's manual before using.
ELECTRIC SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in danger-
ous operation, serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious
injury, and death or property damage.
• Before servicing, disconnect all electrical power to the furnace.
• When servicing controls, label all wires prior to disconnecting.
Reconnect wires correctly.
• Verify proper operation after servicing.
This burner must be installed, adjusted, and started only by a
qualified service agency - an individual or agency, licensed and
experienced with all codes and ordinances, who is responsible
for the installation and adjustment of the equipment.
• Clean and inspect the electrodes for damage, replacing any that
are cracked or chipped.
• Check electrode tip settings. Replace electrodes if tips are
rounded.
• Inspect the igniter spring contacts.
• Clean the cad cell grid surface, if necessary.
• Inspect all gaskets. Replace any that are damaged or would fail
to seal adequately.
• Clean the blower wheel, air inlet, retention head, and static plate
of any lint or foreign material.
• Check motor current. The Amp draw should not exceed the
nameplate rating by more than 10%.
• Check all wiring for secure connections or insulation breaks.
• Check the pump pressure and cut-off function.
• Check primary control safety lockout timing.
• Check ignition system for proper operation.
• Inspect the vent system for soot accumulation or other restriction.
• Clean the appliance thoroughly according to the manufacturer's
recommendations.
107273-UUM-C-0306
5