MCAC-VTSM-2014-04 R410A DC Inverter VRF V4 Plus Individual Series 50Hz
Installation 73
Table 3: Main pipe selection (L1)
When the equivalent length of all liquid
pipes<90m
When the equivalent length of all liquid pipes≥90m
Note: the main pipe L1 can be selected form table2 or table3, the larger size should be finally selected.
7.4 Example
The example is as blow:
(Provided that the capacity of outdoor unit is 32HP, the equivalent length of all pipes in this system is larger
than 100m, each indoor unit branch pipe’s length is 5m, and the pipe length of each indoor unit branch pipe is
less than 10m)
1. Select indoor unit branch pipes: a ~ g
Refer to table 1, the branch pipes of a, b, c, d, e, f, g are Φ15.9/Φ9.5.
2. Select indoor unit main pipes: L1~L6
1) The downstream indoor units of L6 are N6 and N7, which capacity is 140+140=280＜330. Refer to table 2,
the indoor unit main pipe L6 is Φ22.2/Φ9.5, the branch pipe assembly F is FQZHN-02D.
2) The downstream indoor units of L5 are N5, N6 and N7, which capacity is 140+140+140=420＜460. Refer to
table 2, the indoor unit main pipe L5 is Φ28.6/Φ12.7, the branch pipe assembly E is FQZHN-03D.
3) The downstream indoor units of L4 are N3 and N4, which capacity is 140+56=196＜230. Refer to table 2,
the indoor unit main pipe L4 is Φ19.1/Φ9.5, the branch pipe assembly D is FQZHN-01D.
4) The downstream indoor units of L3 are N2, N3 and N4, which capacity is 140+140+56=336＜460. Refer to
table 2, the indoor unit main pipe L4 is Φ28.6/Φ12.7, the branch pipe assembly C is FQZHN-03D.
5) The downstream indoor units of L2 are N1, N2, N3 and N4, which capacity is 140+140+140+56=476＜660.
Refer to table 2, the indoor unit main pipe L2 is Φ28.6/Φ15.9, the branch pipe assembly B is FQZHN-03D.
6) The branch pipe assembly A downstream with the indoor units N1~N7, the capacity of that is
140+140+140+140+140+140+56=896＜920. Refer to table 2, the branch pipe assembly A is FQZHN-03D.
7) The pipes in the above figure are 100m≥90m, and the outdoor unit capacity is 32HP, thus we could find out
the main pipe’s dimension isΦ38.1/Φ22.2.
3. Select main pipe: L1
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