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START UP & ADJUSTMENTS
Pre-Start Check List
Verify the indoor unit is level and allows proper
condensate drainage.
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
Verify air fi lters are cleaned and properly installed.
Verify duct work is sealed to prevent air leakage.
Verify line voltage power leads are securely connected
and the unit is properly grounded.
Verify low voltage wires are securely connected to the
correct leads on the low voltage terminal strip.
Verify power supply branch circuit overcurrent protection
is sized properly.
Verify the thermostat is wired correctly.
Start-Up Procedures
The thermostat's function mode should be set to OFF and
the fan mode should be set to AUTO. Close all electrical
disconnects to energize the system.
Air Circulation - Indoor Blower
1. Set the thermostat system mode on OFF and the fan
mode to ON.
2. Verify the blower runs continuously. Check the air
delivery at the supply registers and adjust register
openings for balanced air distribution. If insuffi cient
air is detected, examine ductwork for leaks or
obstructions.
3. Set the thermostat fan mode to AUTO and verify the
blower stops running.
System Cooling
1. Set the thermostat's system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verify the outdoor unit and indoor blower energize.
2. Verify blower wheel is spinning in direction indicated
by arrow. Feel the air being circulated by the indoor
blower and verify that it is cooler than ambient
temperature. Listen for any unusual noises. If unusual
sounds occur, determine the source of the noise and
correct as necessary.
3. Verify HI and LO refrigerant pressures.
4. Allow the system to operate for several minutes
and then set the temperature selector above room
temperature. Verify the fan and compressor cycle off
with the thermostat. NOTE: The blower should also
stop unless fan mode is set to the ON position.
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.
8
Refrigerant Charging
WARNING:
JS6BD Split System Air Conditioners leave
the factory with an R-410A refrigerant holding
charge. Follow these charging instructions for
maximum unit performance and effi ciency. Some
local codes require licensed installation/service
personnel to service this type of equipment.
Refrigerant charging must be done by qualifi ed
personnel familiar with safe and environmentally
responsible 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 fi nalizing the full system refrigerant charge. For
fi nal charges based on matched systems and specifi ed
line lengths, see physical and electrical specifi cations
(Table 4, page 11).
• Refrigerant charging charts are applicable only to
matched assemblies of NORDYNE equipment and
listed airfl ows for the indoor coil. Refer to Figures 7 -
12 (pages 16 - 18) for correct system charging.
• JS6BD outdoor units with indoor coils not listed are
not recommended. Deviations from rated airfl ows or
non-listed combinations may require modifi cation to the
expansion device and refrigerant charging procedures
for proper and effi cient system operation.
• The refrigerant charge can be checked and adjusted
through the service ports provided external to the
outdoor unit. Use only gage line sets which have a
"Schrader" depression device present to actuate the
valve.
Charging an R-410A system in AC mode at outdoor
temperatures above 55° F for 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 the appropriate charging chart (Figures 7 - 12).
• 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.
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