AIREDALE R410A - Oil Charging Guide and Calculation; Additional Oil Charge Calculation Example

Oil Charging Guide
In order to determine if a system requires additional oil to accommodate for long interconnecting pipe lines and oil traps,
a simple calculation can be used to approximate the volume of oil required as follows:
OT = (RC / 200) - (OC x 0.09)
Where
OT = Additional Oil Charge / Circuit (kg)
RC = Total Refrigerant Charge / Circuit (kg)
OC = Total Compressor Oil Charge / Circuit (l)
This calculation is based on the following assumptions:
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3) Oil is added at a rate of 5 grams per kilogram of refrigerant
Example
What is the additional oil charge required per circuit for an SC12D023-X200-0
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Refrigerant charge of an SC12D023-X200-0 = 2.9 kg
Refrigerant charge of a CR50 = 4.9 kg
Interconnecting pipe line = 80 x 0.09 = 7.2 kg
Total system refrigerant charge = 2.9 + 4.9 + 7.2 = 15 kg
Compressor oil charge(s) = 1.2 + 1.2 = 2.4 litre
So,
OT = (RC / 200) - (OC x 0.09)
OT = (15 / 200) - (2.4 x 0.09)
OT = -0.141litre
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maximum refrigerant charge for this system when additional oil charge is required as follows:
OT = (RC / 200) - (OC x 0.09)
RC = (OT + OC x 0.09) x 200
RC = (0 + 2.4 x 0.09) x 200
RC = 43.2 kg
SmartCool™ 16 - 60
Precision Air Conditioning
38 SmartCool Technical Manual 7525371 V1.2.0_03_2013
Installation