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thermostat
Wire gauge
2-Wire
cm (in.)
24
140 (55)
22
229 (90)
20
356 (140)
18
572 (225)
table 1. thermostat Wire gauge
optional electric Heater Kits
Optional field-installed electric heater kits may be
available in multiple heating capabilities up to a maximum
of 36kw. Split System Air conditioners are designed to
allow optional auxiliary electric heat to be field installed
as required by the building's particular heating load. The
options available for each unit are shown in the heater
kit installation instructions or the air handlers Technical
Service Literature.
Install the heater kits as directed by the instructions
supplied with the heater kit. Follow all cautions and
warnings as directed.
reFrigerant cHarging
Warning:
these 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 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 properly leak check and evacuate the
outdoor and indoor units and all line connections (using
proper methods) before finalizing the full system refrigerant
charge.
1. Removal of the outdoor section factory nitrogen
charge can be used to purge non-condensables out
of the system prior to conducting your leak check.
Use standard industry practices for leak checking
prior to evacuating the system. When system is ready
for evacuation, make sure the system is capable of
8
recommended t-Stat Wire
length (Unit to t-Stat)
5-Wire
cm (in.)
64 (25)
114 (45)
178 (70)
279 (110)
being pulled down to levels between 350-500 microns
for 30 minutes.
• 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.
• Figures 6-14 (pages 14-18) 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 line sets which have a
"Schrader" depression device present to actuate the
valve.
2. Indoor units are shipped with factory authorized orifices.
One is installed in the distributor assembly. Some
models which cover multiple tonnage equipment will
have additional orifices included. Ensure the correct
orifice size is installed in the distributor assembly for
your specific matched system. All R-22 export units
must be charged with refrigerant as specified in the
supplied addendum (709154).
3. Weigh-In the proper amount of new (or reclaimed) R-22
refrigerant. Refer to the unit Rating Label or Table 2,
Page 11 of this manual for the correct amount of charge
that matches your specific system and connecting line
lengths.
charging Units in ac mode when outdoor
temperature is above 12.8° c (55° F)
(optimized sub-cooling of 6.1° c - 7.8° c (11°
F - 14° F)
1. With the system operating at steady-state, measure the
liquid refrigerant pressure in kPa (PSIG) at the outdoor
unit service valve.
2. Measure the liquid refrigerant temperature in Celsius (
Fahrenheit) at the service valve.
3. Determine the required liquid refrigerant pressure from
Figures 6-14 (pages 14-18).
• 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.
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