Midea V6-i Series Manual page 86

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3.5 Refrigerant Piping Selection Example
The example below illustrates the piping selection procedure for a system consisting of one outdoor unit (28kW) and 6
indoor units. The system's equivalent length of all liquid pipes and gas pipes is in excess of 90m.
Figure 3-3.4: Refrigerant piping selection example
Legend
L1 Main pipe
L2 to L5 Indoor main pipes
a to f Indoor auxiliary pipes
A to E Indoor branch joints
Figures in parentheses indicate indoor unit
capacity indexes.
Step 1: Select indoor auxiliary pipes
 Indoor units N1, N2 and N6 are of capacity 5.6kW. Refer to Table 3-3.4. Indoor auxiliary pipe a, b and f is Φ15.9 / Φ9.53.
 Indoor units N3 to N5 are of capacity 4.5kW. Refer to Table 3-3.4. Indoor auxiliary pipes c to e is Φ12.7 / Φ6.35.
Step 2: Select indoor main pipes and indoor branch joints B to E
 The indoor units (N1 and N2) downstream of indoor branch joint B have total capacity of 5.6+ 5.6 = 11.2kW. Refer to
Table 3-3.3. Indoor main pipe L2 is Φ15.9 / Φ9.53. Indoor branch joint B is FQZHN-01D.
 The indoor units (N3 and N4) downstream of indoor branch joint D have total capacity of 4.5+ 4.5 = 9kW. Refer to Table
3-3.3. Indoor main pipe L4 is Φ15.9 / Φ9.53. Indoor branch joint D is FQZHN-01D.
 The indoor units (N5 and N6) downstream of indoor branch joint E have total capacity of 4.5+ 5.6 = 10.1kW. Refer to
Table 3-3.3. Indoor main pipe L5 is Φ15.9 / Φ9.53. Indoor branch joint E is FQZHN-01D.
 The indoor units (N3 to N6) downstream of indoor branch joint E have total capacity of 4.5 x 3+ 5.6 = 19.1kW. Refer to
Table 3-3.3. Indoor main pipe L3 is Φ19.1 / Φ9.53. Indoor branch joint E is FQZHN-01D.
Step 3: Select main pipe and indoor branch joint A
 The indoor units (N
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system's equivalent length of all liquid pipes and gas pipes is in excess of 90m. The capacity of the outdoor unit is 28kW.
Refer to Tables 3-3.3 and 3-3.4. Main pipe L
Indoor branch joint A is FQZHN-03D.
to N ) downstream of indoor branch joint A have total capacity of 4.5 x 3+ 5.6 x 3 = 30.3kW. The
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is the larger of Φ22.2 / Φ9.53 and Φ25.4 / Φ12.7, hence Φ25.4 / Φ12.7.
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V6-i VRF 50Hz
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