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363857-YUM-A-0208
4 Johnson Controls Unitary Products
MAINTENANCE
GENERAL
Snow or debris should not be allowed to accumulate in or
around the unit. Do not permit overhanging structures or
shrubs to obstruct condenser air discharge, combustion air
inlets or vent air outlets on your unit. Adequate air is impor-
tant to the safe and proper operation of the unit.
HEATING SYSTEM INSPECTION
It is the owner's responsibility to insure that an annual inspec-
tion of the entire heating portion of the unit is made by a qual-
ified service agency. This should include inspection of the
burners, tubes and flue for any corrosion or soot accumula-
tion which may require cleaning and also checking of burners
and controls for proper operation.
In addition, at least once during the heating season, the
owner shall make a visual inspection of the flue or vent air
outlets for evidence of black soot or blockage by leaves or
other debris. If any soot is found it is recommended a quali-
fied service agency be called immediately. Also clear any
blockage found around either the vent air hoods or combus-
tion air inlets.
Check for obvious signs of deterioration of the furnace.
Check that the return and supply ducts attached to the unit
are sound and air tight without sagging cracks or gaps.
Check that the unit's physical support, 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.
Start the furnace. The ventor motors should start and after a
short delay the main burners should ignite. If they do not,
contact a qualified service person for assistance. Check the
appearance of each main burner flame. The flame should
have a blue appearance. No yellow flame should be
observed. A yellow flame indicates a problem with the com-
bustion system or that cleaning is required.
LUBRICATION
Outdoor fan and ventor motors are permanently lubricated.
Lubrication is not recommended.
All other fans and motors should be lubricated per schedule
in MAINTENANCE SECTION in the UNIT INSTALLATION
INSTRUCTION.
AIR FILTERS
NOTE: For hi-efficiency rigid or bag filters, consult manufac-
turers manual.
Filters must always be used. They should be inspected once
a month and thoroughly cleaned or replaced if it appears they
are beginning to accumulate excessive dirt. Filter sizes and
quantities are shown in the following table.
To install the filters, open the filter access door.
Slide the dirty filters out and slide the clean filters all the way
into the filter racks provided (see Fig. 4). They must butt each
other when sliding into position. Close the filter access door.
NOTE: Filters must be installed with “Air Flow” arrows point-
ing toward the evaporator coil. They must also be
re-installed in their original position without any gaps
between filters.
CONDENSER COIL
An annual check and cleaning, if necessary, of the condenser
coil should be done. Clean any debris and dirt from the out-
side coil face with a brush being careful not to damage the
fins. If extremely dirty, a hose can be used to wash the coil
from the inside out while brushing a soapy solution on the
outside.
BLOWER ASSEMBLY
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/or the blower wheel are heavily coated with
dust, they can be brushed and cleaned with a vacuum
cleaner.
BEFORE CALLING A SERVICE PERSON:
A. Check controller setting and insure it is calling for heat-
ing or cooling.
B. Check fuses or circuit breakers.
C. Check filters for excessive dust accumulation.
Prior to any of the following maintenance proce-
dures, shut off all power to the unit.