Short Cycle Protection; Optional Equipment; Adjustment Of Refrigerant Charge - Nordyne R-410A Installation And User Manual

Short Cycle Protection

1. With the system operating in COOLING mode,
record the setpoint temperature setting of the
thermostat.
2. Gradually raise the setpoint temperature
until the outdoor unit and indoor blower de-
energize.
3. Immediately lower the setpoint temperature of
the thermostat to its original setting and verify
that the indoor blower is energized and that
the outdoor unit remains de-energized.
4. After approximately 3 minutes, verify that the
outdoor unit energizes and the temperature
of the air supplied to the facility is cooler than
ambient temperature.

Optional Equipment

A functional checkout should be performed
in accordance with the checkout procedures
supplied with the equipment.
ADJUSTMENT OF REFRIGERANT
CHARGE:
WARNING:
Split sytem air conditoners are shipped
fully charged with R-410A refrigerant
and ready for installation. When a
system is installed according to these
instructions, no refrigerant charging is
required. If repairs make it necessary
for evacuation and charging, it should
only be done by qualified, trained
personnel thoroughly familiar with this
equipment. Some local codes require
licensed installation/service personnel
to service this type of 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.
NOTES:
• The unit must be charged while both fi rst and
second stages are operating.
• To achieve rated capacity and effi ciency the
compressor must be exposed to refrigerant
for at least 24 hours prior to running and then
must be run for a minimum of 12 hours.
• The refrigerant charging charts (Figures 4 -
7, pages 13 - 14) are applicable to matched
assemblies of our equipment and at listed
airfl ows for the indoor coil. Assemblies of
indoor coils and outdoor units not listed are
12
not recommended and deviatons from rated
airfl ows or non-listed equipment combinations
may requiree modifi cations to the expansion
devices and refrigerant charging procedures
for proper and efi cient system operation.
Factory refrigerant levels are listed in Table 3
*4BF-
024KA
036KA
048KB
060KB
Table 3. Split System
Air Conditioner Charge
Charging an R-410A unit in AC mode at
outdoor temperatures above 65F.
1. With the system operating at steady-state,
measure the liquid refrigerant pressure in
psig at the service valve.
2. Measure the liquid refrigerant temperature in
Fahrenheit at the service valve.
3. For the temperature measured, determine the
required liquid refrigerant pressure from the
appropriate charging charts in Figures 4 - 7
(pages 13 - 14).
4. If the pressure measured in step 1 is greater
than the required liquid refrigerant pressure
determined in step 4, then there is too much
charge in the system. Remove refrigerant and
repeat steps 1 through 3 until the system is
correctly charged.
5. If the pressure measured in step 1 is less
than the required liquid refrigerant pressure
determined in step 4, then there is too little
charge in the system. Add refrigerant and
repeat steps 1 through 3 until the system is
correctly charged.
System Charge
R-410A oz.
150
170
278
260