Nordyne Single Package Heat Pump R-410A - Manual (Page 13)

13
Anti Short Cycle Timer Test
The 3 minute time delay feature can be bypassed
by shorting the “TEST” pins together.
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
(page 12).
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:
This heat pump contains liquid
and gaseous refrigerant under
pressure. Adjustment of refrigerant
charge should only be attempted
by qualifi ed, trained personnel
thoroughly familiar with the
equipment and safe responsible
refrigerant handling procedures.
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. See Refrigerant
Charging Charts (Figures 11 - 14, pages 14 &
15) for Charging in Cooling Mode.
Charging an R-410A Unit in AC Mode with
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
(° F) at the service valve.
3. For the temperature measured, determine the
required liquid refrigerant pressure from the
appropriate charging charts.
• 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.
• 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.
Charging an R-410A Unit in Heating Mode.
1. Evacuate the refrigerant system.
2. Weigh in the proper charge as shown on the
unit rating plate and use the Heating Charging
Tables (pages 16 & 17) as a guide. Tables
refl ect conditions at high speed operation. Unit
charge MUST be verifi ed in cooling season.
3. Verify the unit is operating properly according
to the heating functional checkout on page
12.