Technibel CAFM1V Series Technical Data Manual page 19

1. Model Selecting and Capacity Calculator
For GRFMI306-406R5I units
I If the maximum tubing length (L1) exceeds 90 m (equivalent length), increase the tubing size of the main gas
tube (LM) by one rank.
* The size increase is applied to the gas tube only. In addition, for a 6 HP unit it is not necessary to increase the
tubing size.
I Increasing the tubing size of the gas tubes can reduce the loss of capacity caused by longer tubing lengths.
Refer to Table 1 to increase the tubing size. However, the maximum allowable tubing length must not be exceeded.
* The size increase is applied to the LM gas tube (main tube with the largest diameter) only, and is limited to the
cases shown in Table 1. In addition, the amount of additional refrigerant charge is determined from the liquid-
tube size only.
* In case of 6PS, increasing the size of the gas tube is not possible.
2
Table 1 Correction coefficient for equivalent length when the size of the gas tube (LM) is increased
Standard tube diameter (gas tube, mm)
Tube diameter after change (gas tube, mm)
Equivalent length correction coefficient
* When increasing the size of the gas tubing (LM), multiply by the correction coefficient from Table 1 and calculate the
equivalent length for section LM.
Tubing equivalent length after size increase = Standard tubing equivalent length × Equivalent length correction coefficient
WARNING
The upper limit for tubing size is ø19.05. Tubing above that size cannot be used.
Design of Mini Multiset
ø15.88
ø19.05
0.4
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