IOMM AGR AGR 055A through 100A 103
3. The charge can be added at any load condition between 25-100% load per circuit but at least two
fans should be operating per refrigerant circuit if possible. The suction superheat should be in the
6°F-12°F (3.3°C-6.6°C) range.
4. Add sufficient charge to clear the liquid line sightglass and until all flashing stops in the
sightglass. Add an extra 15-20 lbs. of reserve to fill the subcooler if the compressor is operating
at 50-100% load.
5. Check the unit subcooling value by reading the liquid line pressure and temperature at the liquid
line near the filter-drier. The subcooling values should be between 6°F-20°F (6.6°C-11.1°C).
The subcooling values will be highest at 75-100% load, approximately 12°F-20°F (6.6°C-11.1°C)
and lowest at 50% load, approximately 6°F-12°F (3.3°C-6.6°C).
6. With outdoor temperatures above 60°F (15.6°C) all condenser fans should be operating and the
liquid line temperature should be within 5°F-10°F (2.8°C-5.6°C) of the outdoor air temperature.
At 25-50% load the liquid line temperature should be within 5°F (2.8°C) of outdoor air
temperature with all fans on. At 75-100% load the liquid line temperature should be within 10°F
(5.6°C) of outdoor air temperature with all fans on.
7. Overcharging of refrigerant will raise the compressor discharge pressure due to filling of the
condenser tubes with excess refrigerant.
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