Installation Instructions

REFRIGERANT CHARGING INSTRUCTIONS
1
When charging in cooling mode, the outdoor temperature should
be 60°F or higher. To allow the pressures to stabilize, operate the
system a minimum of 15 minutes between adjustments. When
adjusting charge to systems with micro-channel outdoor coils,
make small (1 ounce or less) adjustments as these systems are
very sensitive to refrigerant charge.
TXV Charging
2, 3, 4
– Use the charging method recommended
by the outdoor unit instructions. Alternatively, ADP
recommends charging to 12°F sub-cooling for AC units and
10°F sub-cooling for heat pump units. In addition, if equipped
with an adjustable valve, adjust to 10°F superheat.
Fixed Orifice Charging
2, 3, 4
– Use the superheat recom-
mended by the outdoor unit instructions. Alternatively, ADP
recommends charging to the superheat table below.
For heat pump units initially charged in the cooling mode, final
adjustments to charge in the heating mode are acceptable if
Outdoor
Air Temp. (°F)
60 65 70 75 80 85 90 95 100 105 110 115
Superheat (°F) 31 28 25 22 20 16 13 10 8 6 5 5
REFRIGERANT LINE INSTALLATION
ADP recommends installing a filter drier and sight glass in the
liquid line. While brazing, purge the system with Nitrogen to
prevent contamination. ADP recommends reattaching and
insulating the TXV sensing bulb at a 10 to 2 o’clock position on
the suction line, outside the coil housing, no more than one foot
from the connection. Evacuate the system to 500 microns to
ensure proper air and moisture removal (Note: Deep evacuation
or triple evacuation method recommended). Open the suction
service valve slowly and allow the refrigerant to bleed into the
system before opening the liquid service valve.
necessary. Some heat pump units require charging in the
heating mode. In this case, refer to the outdoor instructions for
recommended charging procedures.
If the system is undercharged after the initial charge, add re-
frigerant until the sight glass is clear and recommended pres-
sures, temperatures, sub-cooling and superheat can be ob-
tained. If the system is overcharged after the initial charge,
recover refrigerant until recommended pressures, tempera-
tures, sub-cooling and superheat can be obtained.
Notes:
1. If any problems or questions regarding charge occur, con-
tact customer service.
2. OEM charging methods vary depending on design and
application. Verify all recommended pressures, tempera-
tures, sub-cooling and superheat settings result in the
proper charge.
3. ADP coils may require charge compensation due to size
variation versus the OEM coil.
4. Temperatures are ±2°F unless otherwise recommended.