9
• If the pressure measured in Step 1 is less than the
required liquid refrigerant pressure determined in
Step 3, there is too little charge in the system. Add
refrigerant and repeat Steps 1 through 3 until the
system is correctly charged.
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.
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 Temperature Limit Switches
Compressors Thermostats
Contactors Time Delay Relays
Pressure Switches Transformers
Relays
MOTORS:
Blower Motor
Fan Motor
COMPONENTS:
Blower Assembly Fan Grille
Cabinet Panels Filter/Driers
Expansion Valves
COMPONENT FUNCTIONS
High Pressure Switch (HPS)
A high-pressure switch is factory-installed and located in
the liquid line internal to the outdoor 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 575 psig, then the switch will open and de-
energize the outdoor unit. The switch will close again
once the liquid pressure decreases to 460 psig. Please
note that the switch interrupts the thermostat inputs to
the unit. Thus, when the switch opens and then closes,
there may be a 5 minute short cycling delay before the
outdoor unit will energize.
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