overcharged system can result in excessively high pressures, leading to system failure, and possible venting. The only accurate method to charge a system that requires a critical charge is to weigh the refrigerant into the
system. It is important to verify the accuracy of charging scales and recalibrate them as per the manufacturer’s instructions. You should place a static known value weight onto the scale to verify the scale’s accuracy.
Note: Most charging scales have a zeroing feature that calibrates the scale to zero. The most common procedure
is to 1) place the refrigerant cylinder on the scale, 2) depress the zeroing switch or button until the readout is
zero, 3) begin charging and note the readout as it changes, 4) stop charging when the readout is equal to the total
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