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System Heating (optional)
1. Set the thermostat's system mode to HEAT and the
temperature mode above room temperature.
2. Verify the optional heating equipment (furnace or
electric heat) and indoor blower energize. Feel the air
being circulated by the indoor blower and verify that
it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
Refrigerant Charging
WARNINg:
4-5 Ton Split System Air Conditioners leave
the factory with a nitrogen holding charge.
Follow these charging instructions for
maximum unit performance and efficiency.
Some local codes require licensed installation/
service personnel to service this type of
equipment. Refrigerant charging must be
done by qualified personnel familiar with
s a fe a n d e nv i ro n m e n t a l ly r e s p o n s i bl e
refrigerant handling procedures. Under no
circumstances should the owner attempt
to install and/or service this equipment.
Failure to comply with this warning could
result in property damage, personal injury,
or death.
After refrigerant line connections are completed, it is
required that you leak check and evacuate the indoor
section and all line connections (using proper methods)
before finalizing the full system refrigerant charge.
• To achieve rated capacity and efficiency the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then the compressor must be run
for a minimum of 12 hours.
• Tables 3 & 4 (page 15) are applicable only to matched
assemblies of NORDYNE equipment and listed airflows
for the indoor coil. Outdoor units with indoor coils
not listed are not recommended and deviations from
rated airflows or non-listed combinations may require
modification to the expansion device and refrigerant
charging procedures for proper and efficient system
operation.
• The refrigerant charge can be checked and adjusted
through the service ports provided external to the
outdoor unit. Use only gage linesets which have a
"Schrader" depression device present to actuate the
valve.
• 4 Ton units should use 0.079 orifice in the liquid line
and should be charged with 67 oz. of R-22 refrigerant
as specified in the supplied addendum (7091540).
5 Ton units should use 0.093 orifice in the liquid line
and should be charged with 82 oz. of R-22 refrigerant
as specified in the supplied addendum (7091540).
Charging Units in AC mode when Outdoor Temperature
is above 55° F (optimized sub-cooling of 10° F - 12° F)
1. With the system operating at steady-state, measure
the liquid refrigerant pressure (in PSIG) at the outdoor
unit service valve.
2. Measure the liquid refrigerant temperature (in
Fahrenheit) at the service valve.
3. Determine the required liquid refrigerant pressure from
Table 3 & Table 4 (page 15).
• 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, 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 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 un-
equipped with oil tubes. The compressor is hermetically
sealed at the factory and does not require lubrication.
9
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