4.3.2 Connection with VRF indoor units and HT hydro module
The piping length and level difference requirements that apply are summarized in Table 3-4.4 and are fully described as
follows (refer to Figure 3-4.3):
1. Requirement 1: The total length of piping in each refrigerant system should not exceed 600m. When calculating the
total length of piping, the actual length of the indoor main pipes (the piping between the first indoor branch joint and
the MS box, L2 to L9) should be doubled.
2. Requirement 2: The piping between the farthest indoor unit and the first outdoor branch joint should not exceed 135m
(actual length) and 160m (equivalent length). (The equivalent length of each branch joint is 0.5m and the equivalent
length of each MS box is 1m.) When the equivalent piping length from outdoor units to the farthest VRF indoor unit
or HT hydro module unit is ≥ 90 m, the liquid pipe of the main pipe (L1) should be increased as Table 3-4.2.
3. Requirement 3: The piping between the farthest indoor unit (N8) and first indoor branch joint (A) should not exceed
40m in length (L1 + L2 + L4 + f + i ≤ 40m). The piping between HT hydro module and first branch joint should not exceed
40m in length (L5 + L9 +o ≤ 40m)
4. Requirement 4: The largest level difference between indoor unit or HT
hydro module and outdoor unit should not exceed 50m when the outdoor
unit is above. The largest level difference between indoor unit or HT hydro
module and outdoor unit should not exceed 40m when the outdoor unit is
below.
5. Requirement 5: The largest level difference between indoor units should
not exceed 30m.
6. Requirement 6: Piping between outdoor unit and outdoor branch joint should not exceed 30m. g1 ≤ 10 m; g2+G1 ≤ 10
m; g3 + G1 ≤ 10 m
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