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• 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
Oil quantity/m of refrigerant pipe (gas pipe)
Refrigerant pipe size x Wall thickness
(For material: C1220 1/2H)
Ø6.35×t0.5
Ø9.52×t0.8
Ø12.7×t1.0
Ø15.88×t1.2
Ø19.05×t1.4
Charge quantity (cc/m)
3
5
7
11
16
1830cc
3430cc
2780cc
4380cc
1,800
2,300
2,800
3,300
3,800
4,300
4,800
0m
20m
40m
60m
80m
100m
O
il
q
ua
ntit
y(
cc
)
Equivalent pipe length (
m
)
Standard oil quantity
Maximum oil quantity
4. Maximum refrigerant machine oil quantity
Φ19.05 equivalent pipe length = Piping refrigerating oil quantity(cc)/16(cc/m)
5. System design recommendations
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.
Fig. 23
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
36
AB408540130380en-000102
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Application Guidelines
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