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Figure 1 Maximum acceptable dimensions for a VRF system
to the evaporator units. Thus, the evaluation has been performed and is presented in the following section together with compliances and guidance for maximum allowed distances via VRF systems.
1.2.2.1 Verification of the VRF system suitability (dimensions)
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Although the maximum allowed refrigerant pipe lengths for the VRF system varies with different manufacturers, the guidance for the maximum measurements between the various units was used provided by ASHRAE. Figure 1 below shows the suggestive pipe lengths for diverse system layout.
Figure 1 Maximum acceptable dimensions for a VRF system
Thus, according to ASHRAE, the maximum pipe distances are as follows:
The maximum allowable vertical distance between an outdoor unit and its farthest
indoor unit is 164 ft - 50m; The maximum permissible vertical distance between two individual indoor units is 49 feet - 15m; The maximum overall refrigerant piping lengths between outdoor and the farthest indoor unit is up to 541 ft - 165m.