Explain Unit Function; General Maintenance; Heating System Inspection; Burner Check - York DF078 Series User's, Maintenance And Service Information Manual

EXPLAIN UNIT FUNCTION

When the system is functioning properly, show the
owner the location of all disconnect switches and the
thermostat. Explain how to start and stop the unit and
how to adjust temperature settings within the limitations
of the system. Advise that the flue exhaust hood sur-
face and the immediate area will experience high tem-
peratures during the heating cycle, and that all
unauthorized personnel and debris must be kept away
from this area.

GENERAL MAINTENANCE

In order to insure long and trouble free service from
your system, we recommend periodic inspection,
cleaning, lubrication and adjustment by your installing
Dealer/Contractor. Be sure to ask about this service.
For those who prefer to do-it-yourself, please follow the
instructions listed below to care for your system.
Snow or debris should not be allowed to accumulate in
or around the unit. Do not permit overhanging struc-
tures or shrubs to obstruct outdoor air discharge, com-
bustion air inlets or vent outlets on your unit. These
provide air for combustion and ventilation. Adequate air
is important to the safe and proper operation of the
unit.

HEATING SYSTEM INSPECTION

It is the owner's responsibility to insure that an annual
inspection of the entire heating portion of the unit is
made by a qualified service technician. This should
include inspection of the burner, heating element and
flue for any corrosion or soot accumulation which may
require cleaning and also checking of burner and con-
trols for proper operation.
In addition, at least once during the heating season,
the owner shall make a visual inspection of the flue out-
let for evidence of black soot or blockage of flue outlet
by leaves or other debris. If any soot is found, it is rec-
ommended a qualified service technician be called
immediately. If any blockage is found, it must be
cleared immediately.
Check for obvious signs of deterioration of the unit.
Check that the return and supply ducts attached to the
unit are sound and air tight. Check that the unit's physi-
cal support, concrete slab or roof curb, is sound and
not in need of repair. Make sure there are no gaps
between the roof curb and the unit where rain could
leak into the building.
Start the furnace. The vent motor should start, the
igniter will start to spark and ignite the burner. If it does
not, contact a qualified service technician for assis-
tance. Check the appearance of the main burner flame.
The flame should have a blue appearance. (See Fig-
ure 3.)
4
G A S
S U P P L Y
B U R N E R
P I P E
B U R N E R B R A C K E T
I G N I T O R
FIGURE 3- TYPICAL FLAME

BURNER CHECK

Periodically (at least annually at the beginning of each
heating season) make a visual check of the main
burner flame to determine if the burners need cleaning.

CLEANING BURNERS

Remove them from the furnace as explained the in
BURNER/ORIFICE INSTRUCTIONS section in the
Unit Installation Instructions. Clean burners with wire
brush and vacuum as needed.
CLEANING FLUE PASSAGES & HEATING ELEMENTS
With proper combustion
exchanger tubes of a gas-fired furnace will seldom
need cleaning. If the tubes should become sooted,
they can be cleaned as follows:
1. Remove the burner assembly as outlined in
"BURNER/ORIFICES INSTRUCTIONS" of the unit
Installation Instructions.
2. Remove the screws holding the flue collector box.
Carefully remove the flue collector box.
3. Remove the flue baffles from the tube interiors.
4. Using a wire brush on a flexible wand, brush out
the inside of each heat exchanger from the burner
inlet and flue outlet ends.
5. Brush out the inside of the flue collector box and
the flue baffles.
6. Run the wire brush into the flue exhaust tube from
the flue collector end. Do not damage the flue
exhaust screen, remove if necessary.
7. If soot build-up is particularly bad, remove the draft
motor and clean the wheel and housing.
8. After brushing is complete, blow away all brushed
areas with air or nitrogen. Vacuum as needed.
9. Replace parts in the reverse order that they were
removed in Steps 1 through 3.
10. Assure that all seams on the vent side of the com-
bustion system are airtight. Apply a high tempera-
ture (500°F+) sealing compound where needed.
035-19047-002-A-1103
H E A T E X C H A N G E R T U B E
B U R N E R . L A M E
( B L U E O N L Y )
adjustment, the heat
Unitary Products Group