14
SYSTEM EVACUATION
Following the pressure testing for leaks, the system must be evacuated.
Use a vacuum pump (not a compressor) to draw a vacuum of 200 microns or less from
both sides of the system. Do not attempt to draw a vacuum on the system with the pump
connected only on the low side. The high side of the system should be interconnected with
the low side by using a minimum 3/8” OD copper tube. Use an electronic gauge to
measure the vacuum because a refrigeration gauge cannot provide an accurate reading
at this resolution.
Break the vacuum with dry nitrogen. These procedures should be performed at ambient
temperature above 18.33°C.
Note:
Never use a compressor to evacuate a system. Instead, use a high-pressure
vacuum pump specifically designed for that purpose. Never start the compressor while it is
under a deep vacuum. Always break the vacuum with a refrigerant charge before
energizing the compressor. Failure to follow these instructions can damage the hermetic
terminal. As always, to avoid serious injury or death from terminal venting with ignition,
never energize the compressor unless the terminal cover is securely fastened.
WARRANTY
Warranty will be voided if compressor
Follow the evacuation procedure very carefully.
fails as a result of moisture related problems.
SYSTEM CHARGING
Failure to properly charge the system can result in serious injury or death from
explosion or fire. Follow these precautions when charging a system:
Do not operate the compressor without charge in the system.
Operating the compressor without a charge in the system can damage the hermetic
terminal. To avoid serious injury or death from terminal venting with ignition, never
energize the compressor unless the protective terminal cover is securely fastened.
Use only the serial label refrigerant when charging the system. Using a different
refrigerant can lead to excess system pressure and an explosion. Use of a refrigerant
other than the serial label refrigerant will void the compressor warranty.
Do not overcharge a refrigeration or air conditioning system.
Overcharging a refrigeration or air conditioning system can result in explosion. To avoid
serious injury or death, never overcharge the system. Always use proper charging
techniques.
Limit charge amounts to those specified on the system equipment serial label or in the
original equipment manufacturer’s service information.
Overcharging the system immerses the compressor motor, piston, connecting rods,
and cylinders in liquid refrigerant. This creates a hydraulic block preventing the
compressor from starting. The hydraulic block is also known as locked rotor.
WARRANTY
Use of a refrigerant other than those listed on the serial label will void the compressor
warranty.
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