Oil Charging Guide - AIREDALE EasiCool Technical Manual

EasiCool™

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)
This calculation is based on the following assumptions:
1) 10% of the total compressor oil charge enters the system
2) A specific gravity of 0.09 between oil and water
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 DF10X-EZRE matched with
a CR16 and a 3/8" 80m interconnecting liquid line?
Refrigerant charge of an DF10X - EZRE = 1.0 kg
Refrigerant charge of a CR50 = 2.7 kg
Interconnecting pipe line = 80 x 0.05 = 4.0 kg
Total system refrigerant charge = 1.0 + 2.7 + 4.0 = 7.7 kg
Compressor oil charge(s) = 1.2 litre
A negative value (as above) suggests that there is already sufficient oil in the system. You can calculate the
maximum refrigerant charge for this system when additional oil charge is requiredas follows:
OT = (RC / 200) - (OC x 0.09)
RC = OT + (OC x 0.09 x 200)
RC = 0 + (1.2x 0.09 x 200)
RC = 21.6 kg
48 EasiCool Technical Manual 7525389 V1.8.0_05_2016
Precision Air Conditioning
Where
OT = Additional Oil Charge / Circuit (kg)
RC = Total Refrigerant Charge / Circuit (kg)
OC = Total Compressor Oil Charge / Circuit (l)
So,
OT = (RC / 200) - (OC x 0.09)
OT = (7.7 / 200) - (1.2 x 0.09)
OT = -0.07 litre