42 ● gForce Ultra User Manual 10-2014
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.
5.5 Check a Running Compressor
Check current draw and voltage.
Check suction superheat to reduce risk of slugging.
Observe the oil level at start and during operation to confirm that the oil level
remains visible.
Excess foaming in oil sight glass indicates refrigerant on the sump.
Monitor the oil sight glass for 1 hour after system equilibrium to ensure proper oil
return to the compressor. This oil check has to be done over the speed range to
guarantee:
- A good oil return at low speed with minimum gas velocity.
- A good oil management at high speed with maximum oil carry over.
Check all tubes for abnormal vibration. Movements in excess of 1.5 mm require
corrective measures such as tube brackets.
When needed, add refrigerant.
Do not overcharge the system.
Record type and amount of refrigerant charge as well as operating conditions as
a reference for future inspections.
5.6 Refrigerant Handling
The use of recovery/recycling units is required by U.S. Environmental Protection Agency
(EPA) regulations. Technicians who service and dispose of air conditioning and
refrigeration equipment must recover the refrigerant instead of venting it to the
atmosphere.
Except for extremely small releases of refrigerant such as what occurs when
disconnecting service hoses, a technician who knowingly releases or vents refrigerant to
the atmosphere is in violation of this regulation. Refrigerant purchasers must be
certified technicians and have a valid EPA certification card.
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