Danfoss Optyma OP-UPAC015COP04E Application Manuallines page 35

Application Guidelines
2. Piping condensing unit oil quantity
•This is calculated based on the specifications of connecting gas pipe (pipe size) and the length of each pipe. Where no branching pipe is
used, take the length of pipe to the farthest low pressure device as the pipe length. Where it is used, take the sum of the length of pipe to
the pipe joint of farthest low pressure device from first branching and the length of pipe to the pipe joint of second farthest device as the
pipe length. Example of calculation where there are branch pipes is as shown below.
Example of calculation
Farthest equipment in group a
Farthest equipment in group b
Farthest equipment in group c
Fig. 22
• Items necessary to calculate the oil quantity vary depending on the distance to the farthest length from first branch.
Farthest in group a: LA = L2 + La1 + La2 + La3
Farthest in group b: LB= L2 + Lb1 + Lb2 + Lb3 + Lb4
Farthest in group c: LC= Lc1 + Lc2 + Lc3 + Lc4
Where LB > LC > LA, calculate the piping oil quantity from LB and LC.
• Piping condensing unit oil quantity = (Oil quantity/unit length of L1 pipe) x L1 (m) + (Oil quantity/unit length of L2 pipe) x L2 (m)
+ (Oil quantity/unit length of Lb1 pipe) x Lb1 (m) + (Oil quantity/unit length of Lb2 pipe) x Lb2 (m)
+ (Oil quantity/unit length of Lb3 pipe) x Lb3 (m) + (Oil quantity/unit length of Lb4 pipe) x Lb4 (m)
+ (Oil quantity/unit length of Lc1 pipe) x Lc1 (m) + (Oil quantity/unit length of Lc2 pipe) x Lc2 (m)
+ (Oil quantity/unit length of Lc3 pipe) x Lc3 (m) + (Oil quantity/unit length of Lc4 pipe) x Lc4 (m) ............ (a)
© Danfoss | Climate Solutions | 2023.02
5. System design recommendations
Group a
La3 La2
φ9.52 φ9.52
1m 3m
Group b
Lb4
Lb2
Lb3
φ9.52 φ9.52 φ12.7
1m 3m 10m
Group c
Lc4 Lc3 Lc2
φ9.52
φ9.52 φ12.7
1m 10m
1m
Low pressure device
La1
φ15.88
10m
Second branch
Lb1
L2
φ15.88 φ15.88
10m 10m
Lc1
φ15.88
10m
Condensing unit
OP-UPAC015COP04E
First branch
L1
φ19.05
40m
AB408540130380en-000102
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