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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
For 4hp, 5hp units
Increasing the tubing size of the gas tubes can reduce the loss of capacity caused by longer tubing lengths.
Refer to Table 1-11 to increase the tubing size. However, the maximum allowable tubing length must not be
exceeded.
exceeded.
* The size increase is applied to the LA gas tube (main tube) only, and is limited to the cases shown in Table 1-11.
In addition, the amount of additional refrigerant charge is determined from the liquid tube size only.
* In case of 6HP, increasing the size of the gas tube is not possible.
Table 1-11 Correction coefficient for equivalent length when the size of the gas tube (LA) is increased
Standard tube diameter (gas tube, mm)
ø15.88
Tube diameter after change (gas tube, mm)
ø19.05
Equivalent length correction coeffi cient
0.4
* When increasing the size of the gas tubing (LA), multiply by the correction coefficient from Table 1-11 and calcu-
late the equivalent length for section LA.
Tubing equivalent length after size increase = Standard tubing equivalent length × Equivalent length correction coeffi cient
The upper limit for tubing size is ø19.05. Tubing above that size cannot be used.
WARNING
TD831155-04_MINI VRF.indb 12
TD831155-04_MINI VRF.indb 12
2014/05/09 15:29:02
2014/05/09 15:29:02
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