Danfoss Optyma iCO2 Instructions Manual page 15

Instructions
• 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)
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.
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.
Φ19.05 equivalent pipe length = Piping refrigerating oil quantity(cc)/16(cc/m)
Fig. 17
© Danfoss | Climate Solutions | 2023.02 | LCA012A024
Oil quantity/m of refrigerant pipe (gas pipe)
Ø6.35×t0.5
3
4,800
4,300
3,800
3,300
2780cc
2,800
2,300
1830cc
1,800
0m 20m
Equivalent pipe length (m)
Standard oil quantity
Ø9.52×t0.8 Ø12.7×t1.0
5
40m 60m 80m
Maximum oil quantity
Ø15.88×t1.2
7 11
4380cc
3430cc
100m
118A5495A - AN405821998738en-000102 | 15
Ø19.05×t1.4
16