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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 filters 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 insufficient 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.
refrigerant charging
Warning:
S4Bf Split System air conditioners are shipped
charged with r410a refrigerant and ready
for installation. if repairs make it necessary
for evacuation and charging, it should only
be attempted by qualified trained personnel
thoroughly familiar with this equipment. 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.
• Refrigerant charging charts are applicable only to
matched assemblies of NORDYNE equipment and
listed airflows for the indoor coil. Refer to Figures 5 - 8
(pages 9 - 11) for correct system charging.
• S4BF outdoor units with non-AHRI listed indoor coils
are not recommended. 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 line sets which have a
"Schrader" depression device present to actuate the
valve.
Charging the Unit 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 5 - 8).
• 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.
7
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