Adjustment Of Refrigerant Charge - Nordyne Two Stage R-410A Split System User's Information/Installation Instructions

Note: If the "Y2" thermostat input is energized
(on a 2-stage system), the second stage will
come on.
If the above steps will not initiate a defrost, replace
the defrost board.
Anti Short Cycle Timer Test
The 3-minute time delay feature can be bypassed
by shorting the "TEST" pins together.
Note: [Heating Mode] When the "TEST" pins are
shorted together for more than 1-second, the
control will switch between defrost mode and
heating mode (as described in the Defrost Test
Procedure section).
Note: [Cooling Mode] When the 'TEST" pins are
shorted together for more than 1-second, the Anti
Short Cycle Timer will be bypassed.

Adjustment of Refrigerant Charge:

CAUTION:
Split system heat pump equipment
contains liquid and gaseous refrigerant
under pressure. Adjustment of
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 unit must be charged while both fi rst
and second stages are operating.
NOTE: 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.
NOTE: The following Refrigerant Charging
Charts are applicable to listed assemblies of
equipment and at listed airfl ows for the indoor
coil. Assemblies of indoor coils and outdoor units
not listed are not recommended.
Procedure for charging an R-410A
unit in AC mode at outdoor tempera-
tures 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 chart below.
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.
Procedure for charging an R-410A
unit in heating mode.
1. Evacuate the refrigerant system.
2. Weigh in the proper charge per Table 4
of these installation instructions using
the Heating Charging Chart as a guide.
Unit charge MUST be verifi ed in cooling
season.
3. Ensure that the unit is operating properly
per the heating functional checkout in
these installation instructions.
Tonnage
2 Ton
3 Ton
4 Ton
5 Ton
Table 4. Split System
Heat Pump Charge
System Charge
R-410A oz.
185
272
272
272
13