Adjustment Of Refrigerant Charge - Nordyne R410-A User's Information And Installation Instructions Manual

closes, there will be a 5 minute short cycling
delay before the outdoor unit will energize.
High-Pressure Switch—A High-pressure
switch is factory-installed and located in the
compressor discharge line internal to the out-
door unit. The switch is designed to de-energize
the system when very high pressures occur
during abnormal conditions. Under normal con-
ditions, the switch is closed. If the discharge
pressure rises above 575 psig, then the switch
will open and de-energize the outdoor unit. The
switch will close again once the discharge pres-
sure decreases to 460 psig. Please note that
the switch interrupts the thermostat inputs to the
unit. Thus, when the switch opens and then
closes, there will be a 5 minute short cycling
delay before the outdoor unit will energize.
Short Cycle Protection—(Select Models) With
the system operating in COOLING mode, note
the setpoint temperature setting of the thermo-
stat, and gradually raise the setpoint tempera-
ture until the outdoor unit and indoor blower de-
energize. Immediately lower the setpoint tem-
perature of the thermostat to its original setting
and verify that the indoor blower is energized
and that the outdoor unit remains de-energized.
Verify that, after approximately 5 minutes, the
outdoor unit energizes and that the temperature
of the air supplied to the facility is cooler than
ambient temperature.
Cooling — Gradually lower the thermostat tem-
perature setpoint below the actual room tem-
perature and observe that the outdoor unit and
indoor blower energize.
circulated by the indoor blower and verify that it
is cooler than ambient temperature. Listen for
any unusual noises.
determine the source of the noise and correct as
necessary.
Heating — If provided with heating equipment,
lower the thermostat setpoint temperature to
the lowest obtainable setting and set the ther-
mostat function switch to HEATING. The indoor
blower and outdoor unit should stop running.
Increase the setpoint temperature of the ther-
mostat to the maximum setting. Verify that the
heating equipment has been energized (i.e.,
fossil fuel burner operating, etc.) and that the
indoor blower energizes after a short period of
time. Feel the air being circulated by the indoor
blower and verify that it is warmer than ambient
6
Feel the air being
If present, locate and
temperature. Listen for any unusual noises. If
present, locate and determine the source of the
noise and correct as necessary.
NOTE: Other sources for heating (i.e.: electric
furnace, fossil fuel furnace, air handler with
electric heat options, etc.) that interface with the
heat pump should be functionally checked to
verify system operation and compatibility with
the heat pump. Refer to the installation instruc-
tions for this equipment and perform a func-
tional checkout in accordance with the
manufacturer's instructions.

Adjustment of Refrigerant Charge:

CAUTION:
!
Split system air conditioner equipment
contains liquid and gaseous refrigerant
under pressure.
refrigerant charge should only be
attempted by qualified, trained
personnel thoroughly familiar with the
equipment. Under no circumstances
should the homeowner attempt to
install and/or service this equipment.
Failure to comply with this warning
could result in equipment damage,
personal injury, or death.
NOTE: The following Refrigerant Charging
Charts are applicable to matched assemblies of
our equipment and at listed airflows for the
indoor coil. Assemblies of indoor coils and
outdoor units not listed are not recommended
and deviations from rated airflows or non-listed
equipment combinations may require modifica-
tions to the expansion device(s) and refrigerant
charging procedures for proper and efficient
system operation.
Refrigerant Charging Chart — Refer to Refrig-
erant Charging Charts for correct system charg-
ing, and to Orifice Usage Chart for correct
restrictor sizes.
Optional Equipment — A functional checkout
should be performed in accordance with the
checkout procedures supplied with the
equipment.
Adjustment of