8
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.
Refrigerant Charging
WARNING:
JS5BD Split System Air Conditioners leave the
factory with a nitrogen holding charge.
DO NOT
operate any unit while it contains a Nitrogen
holding charge. Doing so may damage the
units compressor.
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.
To properly charge these units:
1. Read all Installation Instructions fi rst.
2. Complete any brazing operations. (e.g. Split system
line-sets)
3. Leak check and evacuate the whole system using
proper methods.
4. Purge the nitrogen holding charge.
5. Evacuate the unit to 350-500 microns.
6. Allow the unit to remain under vacuum for at least 30
min.
7. Weigh-In the proper amount of new (or reclaimed)
R-22 refrigerant. Refer to the units rating label or see
Table 4 to determine the correct amount of charge.
• Refrigerant charging charts are applicable only to
matched assemblies of NORDYNE equipment and
listed airfl ows for the indoor coil. Refer to Figures 5 -
11 or Tables 5-11 (pages 10 - 16) for correct system
charging.
• JS5BD 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
Table 4. Refrigerant Metering Device
for 13 SEER Split System Air Conditioner
Model
Number
Restrictor Bore
Size (inches)
System charge
R-22 (oz.)
1.5 ton
0.053
78
2.0 ton (-KB)
0.060
53
2.5 ton (-KB)
0.065
56
3.0 ton (-KB)
0.075
68
3.5 ton
0.078
122
4.0 ton
0.089
126
5.0 ton
0.099
160
