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System Maintenance
WARNING
Installation and maintenance must be per-
formed only by qualified personnel familiar
with local codes and regulations, and experi-
enced with this type of equipment.
WARNING
Moving machinery and electrical power haz-
ards. Can cause severe personal injury or
death.
Disconnect and lock off power before servicing
equipment.
.
CAUTION
Sheet metal parts, screws, clips can be sharp.
May cause personal injury.
Exercise caution and wear protective gear when
servicing equipment.
Preventative Maintenance
Planned maintenance is the best way to avoid unnecessary
expense and inconvenience. Have this system inspected at
regular intervals by a qualified service technician. The
required frequency of inspections will depend on installation
and operating duty. Routine maintenance should cover the
following items:
1.
Tighten all belts, setscrews, and wire connections.
2.
Clean evaporator or economizer coils mechanically or
with cold water, if necessary. Usually any fouling is
only matted on the entering air face of the coil and can
be removed by brushing.
3.
Clean condenser and economizer tubes on a periodic
basis. Condenser and economizer coils can be cleaned
38
chemically or mechanically. Tubing should be kept clean
to maintain system performance.
4.
Lubricate motor and fan shaft bearings.
5.
Align or replace belts as needed.
6.
Replace filters as needed.
7.
Check refrigerant sightglass. Check for refrigerant leaks
if sightglass is not solid with steady-state full load oper-
ation of unit. (Note: A partially full sightglass is not
uncommon at part load conditions. Check for proper
superheat.)
8.
Check for blockage of condensate drain. Clean conden-
sate pan as needed.
9.
Check power and control voltages.
10. Check running amperage.
11. Check operating temperatures and pressures.
12. Check and adjust temperature and pressure controls.
13. Check and adjust linkages.
14. Check operation of all safety controls.
15. Lubricate door latch mechanisms.
Motor Bearings
Fan motors should have grease added after every 2,000
hours of operation. Relubricate while motor is warm and at a
standstill. Remove and clean upper and lower grease plugs,
insert grease fitting into upper hole adding a small amount of
clean grease with a low pressure gun. Run motor for five
minutes before replacing plugs.
Note:
Specific greasing instructions are to be found on a
tag attached to the motor. If special lubrication
instructions are shown on the motor nameplate,
they will supersede all other instructions.
CAUTION
Bearing overheating potential. Can cause dam-
age to the equipment.
Do not overlubricate. Use only a high grade mineral
grease with a 200°F safe operating temperature.
Refer to unit lubrication instruction label for specific
lubricants
IM709
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