11
AIR CONDITIONER MAINTENANCE
WARNING:
To prevent electrical shock, personal injury,
or death, disconnect all electrical power to
the unit before performing any maintenance
or service. The unit may have more than one
electrical supply.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using
a mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
CAUTION:
The unit should never be operated without a
filter in the return air system. Replace disposable
filters with the same type and size.
• Do not attempt to add additional oil to motors unequipped
with oil tubes. The compressor is hermetically sealed
at the factory and does not require lubrication.
• If the pressure measured in step 1 is greater than
the required liquid refrigerant pressure determined in
step 3, then there is too much charge in the system.
Remove refrigerant and repeat steps 1 through 3 until
the system is correctly charged.
• If the pressure measured in step 1 is less than the
required liquid refrigerant pressure determined in
step 3, then there is too little charge in the system.
Add refrigerant and repeat steps 1 through 3 until the
system is correctly charged.
Safety switches
The high-pressure switch is factory-installed and located in
the liquid line internal to the unit. The switch is designed to
protect the system when very high pressures occur during
abnormal conditions. Under normal conditions, the switch
is closed. If the liquid pressure rises above 650 psig, the
switch will open and de-energize the unit. The switch will
close again when the liquid pressure decreases to 460 psig.
The low-pressure switch (if equipped) is factory-installed
and located in the suction line internal to the unit. The
switch is designed to protect the compressor from a loss
of charge. Under normal conditions, the switch is closed.
If the suction pressure falls below 5 psig, the switch will
open and de-energize the unit. The switch will close again
when the suction pressure increases above 20 psig.
Summary of Contents for P7RD-A Series
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