4.3.3 Connection with VRF indoor units and AHU kits
The piping length and level difference requirements that apply are summarized in Table 3-4.5 and are fully described as
follows (refer to Figure 3-4.4):
1. Requirement 1: The total length of piping in each refrigerant system should not exceed 1000m. 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 L13) should be doubled.
2. Requirement 2: The piping between the farthest indoor unit and the first outdoor branch joint should not exceed 175m
(actual length) and 200m (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
AHU 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) or AHU (N11) and first indoor branch joint (A) should
not exceed 40m.
4. Requirement 4: The largest level difference between indoor unit or AHU
and outdoor unit should not exceed 50m when the outdoor unit is above.
The largest level difference between indoor unit or AHU and outdoor unit
should not exceed 40m when the outdoor unit is below.
5. Requirement 5: The largest level difference between indoor units or AHUs
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
To Next Page
Loading...
Need help?
General
