96 OAU-SVX007A-EN
Maintenance
Make sure all personnel are standing clear of the unit before
proceeding. The system components will start when the power
is applied.
Monthly Maintenance
Before completing the following checks, turn the unit OFF and
lock the main power disconnect switch open.
Filters
Inspect the return air filters. Clean or replace them if
necessary. Refer to the unit Service Facts for filter information .
Filter Installation
Cabinet sizes OAD, OAG, OAK, and OAN ship with 2-inch
permanent filters (mist eliminators) installed in the air inlet
hood. The quantity of filters is determined by unit size. Access
to the filters is through the hinged filter access panel on the air
intake hood. In addition to the filters in the intake hood, there
is a separate bank of filters accessible through the evaporator
coil compartment door. Filter type, size, and quantity are
determined by selected filter option and unit size.
Note: Do not operate the unit without filters.
Supply/Return Air Smoke Detector
Maintenance
Airflow through the unit is affected by the amount of dirt and
debris accumulated on the indoor coil and filters.
To insure that airflow through the unit is adequate for proper
sampling by the return air smoke detector, complete
adherence to the maintenance procedures, including
recommended intervals between filter changes, and coil
cleaning is required.
Periodic checks and maintenance procedures must be
performed on the smoke detector to insure that it will function
properly.
For detailed instructions concerning these checks and
procedures, refer to the appropriate section(s) of the smoke
detector installation and maintenance Instructions provided
with the literature package for this unit.
Cooling Season
• Check the unit’s drain pans and condensate piping to
ensure that there are no blockages.
• Inspect the evaporator and condenser coils for dirt, bent
fins, etc. If the coils appear dirty, clean them according to
the instructions described in “Condenser Coil Cleaning,”
p. 97.
• Manually rotate the condenser fan(s) to ensure free
movement and check motor bearings for wear. Verify that
all of the fan mounting hardware is tight.
• Inspect the F/A-R/A damper hinges and pins to ensure that
all moving parts are securely mounted. Keep the blades
clean as necessary.
• Verify that all damper linkages move freely; lubricate with
white grease, if necessary.
• Check supply fan motor bearings; repair or replace the
motor as necessary.
• Check the fan shaft bearings for wear. Replace the
bearings as necessary.
• Verify that all wire terminal connections are tight.
• Remove any corrosion present on the exterior surfaces of
the unit and repaint these areas.
• Generally inspect the unit for unusual conditions (e.g.,
loose access panels, leaking piping connections, etc.).
• Make sure that all retaining screws are reinstalled in the
unit access panels once these checks are complete.
• With the unit running, check and record the: ambient
temperature; compressor suction and discharge
pressures; superheat; Record this data on an “operator’s
maintenance log” like the one shown in Table 14, p. 98. If
the operating pressures indicate a refrigerant shortage,
measure the system superheat.
Note: Do NOT release refrigerant to the atmosphere! If
adding or removing refrigerant is required, the service
technician must comply with all federal, state and local
laws.
Heating Season
• Inspect the unit air filters. If necessary, clean or replace
them.
• Check supply fan motor bearings; repair or replace the
motor as necessary.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.Verify that no
power is present with a voltmeter.
AVERTISSEMENT
Risque d’électrocution!
Le non-respect de cette consigne peut entraîner des
blessures graves, voire mortelles. Avant toute
intervention, coupez l’alimentation électrique, y
compris aux sectionneurs à distance. Suivez
scrupuleusement les procédures de verrouillage/mise
hors service préconisées pour empêcher tout
rétablissement accidentel de l’alimentation électrique.
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