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Maintenance
Owner Maintenance
!
WARNING
EXPLOSION HAZARD!
To prevent an explosion or possible injury, death, and equip-
ment damage. Do not store combustible materials, gasoline,
or other flammable vapors or liquids near the unit.
Some of the periodic maintenance functions of the packaged
unit can be performed by the owner; this includes replacing
the disposable or cleaning the permanent air filters, cleaning
the unit cabinet, and conducting a general unit inspection on a
regular basis.
Filters
When the system is in constant operation, inspect the filters
at least once each month.
If you have disposable-type filters, replace them with new filters
of the same type and size. Do not attempt to clean dispos-
able filters.
Permanent-type filters can be cleaned by washing them with a
mild detergent and water. Make sure that the filters are thoroughly
dry before reinstalling them.
NOTE: It may be necessary to replace permanent filters
annually if washing fails to clean the filter or if the filter shows
signs of deterioration. Be sure to use the same type and
size as was originally installed.
Condenser Coil
Be sure to keep all vegetation and debris away from the condenser
coil area.
Service Maintenance
Service maintenance should be performed by qualified service
personnel.
Cooling Season
To keep the unit operating safely and efficiently, the manufac-
turer recommends that a qualified service technician check the
entire system at least once each year or more often if needed.
The service technician should examine these areas of the
packaged unit:
filters (for cleaning or replacement)
〿
motors and drive system components
〿
economizer gaskets (for possible replacement)
〿
safety controls (for mechanical cleaning)
〿
electrical components and wiring (for possible replacement
〿
and connection tightness)
condensate drain (for proper sealing and cleaning)
〿
unit duct connections (to see that they are physically sound
〿
and sealed to the unit casing)
unit mounting support (for structural integrity)
〿
the unit (for obvious unit deterioration)
〿
Installer's Guide
Heating Season
Complete the following unit inspections and service routines
described at the beginning of each heating season.
Visually inspect the unit to ensure that the airflow required
●
for combustion and condenser coil is not obstructed from the
unit.
Inspect the control panel wiring to verify that all electrical
●
connections are tight and that the wire insulation is intact.
Check the operation of the gas ignition system as follows:
●
Turn off the gas supply with the unit operating to verify that
the gas valve closes and that a re-ignition cycle is initiated
by the unit.
Visually inspect the inside of the burners and the burner ports
●
for deposit buildup and corrosion. Wipe and brush the inside
of the burner and the burner ports and then clean with a dry
cloth. If the deposit buildup or corrosion is excessive, replace
the burners.
Manifold Pressure Check and Adjust
1. Connect a manometer to the pressure tap at the outlet side
of the unit's gas valve (remove the Control/Heat access
panel). Read the manifold pressure with the burners firing.
See Figure 18 on page 18 for gas valve connections.
2. If the manifold pressure reading does not match the value
indicated on the unit's nameplate, the unit's pressure regula-
tor must be adjusted as follows:
a. Remove the cover screw on the gas regulator located on
the front side of the unit's gas valve.
b. Turn the adjusting screw clockwise to increase manifold
pressure or counterclockwise to decrease manifold pres-
sure.
3. Check the temperature rise during furnace operation to
insure that it falls within the range specified on the unit's
nameplate.
4. If the temperature rise noted is outside of the specified limits,
adjust the indoor air flow to cause the temperature rise of
the heat exchanger to fall within the required range.
Page 25
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