Air Conditioner Maintenance; Component Functions; High Pressure Switch; Low Pressure Switch - Nordyne P3RA SERIES User's Manual & Installation Instructions

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 fi lters 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
fi lter in the return air system. Replace disposable
fi lters 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.
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COMPONENT FUNCTIONS

High Pressure Switch (HPS) - Optional
A high-pressure switch may be 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 425
psig, the switch will open and de-energize the unit. The
switch will close again once the liquid pressure decreases
to 360 psig. Please note that the switch interrupts the
thermostat inputs to the unit. When the switch opens and
then closes, there may be a 5 minute short cycling delay
before the unit will energize.
Low Pressure Switch (LPS) - Optional
A low-pressure switch may be 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 once the
suction pressure increases above 20 psig. Please note
that the switch interrupts the thermostat inputs to the unit.
When the switch opens and then closes, there may be a
5 minute short cycling delay before the unit will energize.

REPLACEMENT PARTS

Replacement parts are available through all Nordyne distributors.
Please have the complete model and serial number of the unit
when ordering replacement parts.
ELECTRICAL:
Capacitors
Compressors
Contactors
Pressure Switches
Relays
MOTORS:
Blower Motor
Fan Motor
COMPONENTS:
Blower Assembly
Cabinet Panels
Temperature Limit Switches
Thermostats
Time Delay Relays
Transformers
Fan Grille
Filter/Driers