Charging An R410A Unit In Ac Mode With Outdoor Temperatures Above 55 ° F; Air Conditioner Maintenance; Component Functions; High Pressure Switch - Nordyne P5RD Series User's Manual & Installation Instructions

Charging an R=410A Unit in AC Mode with Outdoor
Temperatures Above 55 ° F
1. With the system operating at steady-state, measure the
liquid refrigerant pressure in psig at the service valve.
2. Measure the liquid refrigerant temperature (o F) at the
service valve.
3. For the temperature measured, determine the required
liquid refrigerant pressure from Tables 4 - 10 or Figure
13. See pages 16 - 19.
• If the pressure measured in step I is greater than
the required liquid refrigerant pressure determined in
step 4, 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 I is less than the
required liquid refrigerant pressure determined in
step 4, then 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 airfilters 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 thoroughlywith 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.
COMPONENT FUNCTIONS
High Pressure Switch (HPS)
A 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
575 psig, the switch will open and de-energize the unit.
The switch will close again when the liquid pressure
decreases to 460 psig.
Low Pressure Switch (LPS)
A low-pressure switch 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.
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
Cabinet Panels
Expansion Valves
Fan Grille
Filter/Driers
• 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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