Danfoss Optyma OP-UPAC015COP04E Application Manuallines page 36

Application Guidelines
Refrigerant pipe size x Wall thickness
(For material: C1220 1/2H)
Charge quantity (cc/m)
• Calculate the piping condensing unit oil quantity from the equation (a) above.
Piping refrigerating oil quantity = 16 x 40 + 11 x 10 + 11 x 10 + 7 x 10 + 5 x 3 + 5 x 1 + 11 x 10 + 7 x 10 + 5 x 1 + 5 x 1 = 1,140 cc
3 Additional condensing unit oil quantity
Additional condensing unit oil is calculated to be 1,140 cc from 2. Round up the oil quantity calculated with 2 by the unit of 100 cc.
If the piping condensing unit oil calculated with 2 is less than 640 cc, it is not necessary to add the piping oil quantity.
Total condensing unit oil in the system becomes 1,830 cc + 1,140 cc = 2,970 cc from 1 and 2.
4. Maximum refrigerant machine oil quantity
Φ19.05 equivalent pipe length = Piping refrigerating oil quantity(cc)/16(cc/m)
Maximum refrigerant machine oil quantity is different by equivalent pipe length. Below equation shows calculation of Φ19.05 equivalent
pipe length and bellow graph shows maximum refrigerant machine oil quantity for each Φ19.05 equivalent pipe length
4,800
4,300
3,800
3,300
2780cc
2,800
2,300
1830cc
1,800
0m
Standard oil quantity
Fig. 23
36
AB408540130380en-000102
5. System design recommendations
Oil quantity/m of refrigerant pipe (gas pipe)
Ø6.35×t0.5
20m 40m 60m
Equivalent pipe length (m)
Ø9.52×t0.8
3 5
4380cc
3430cc
80m 100m
Maximum oil quantity
Ø12.7×t1.0 Ø15.88×t1.2
7 11
© Danfoss | Climate Solutions | 2023.02
Ø19.05×t1.4
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