40 ● gForce Ultra User Manual 10-2014
6 to 12°F (3.33 to 6.67°C) Differential
Measure the superheat at the compressor suction line at least 6 inches (152 mm) away
from the compressor.
Remove any blocks that may have been used on the condenser coil. If the ambient
temperature while charging is below 70⁰F (21⁰C), some of the refrigerant will be backed
up in the condenser coil causing the liquid level in the receiver to drop (this is normal).
Note:
Charging to a full liquid line sight glass should never be the sole
means of determining the correct refrigerant charge. Other parameters
such as superheat, suction pressure, head pressure, sub-cooling and
ambient temperature are also important. A system charged to a clear sight
glass is often overcharged.
When done charging, press the “Auto on” key on the VFD local display to return to
normal operation controlled by the dap4™ controller. Also adjust the fan speed
potentiometer back to the original position and set the slide switches OFF on the
Manual Override Module.
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