8
PIPING MODEL SELECTION
8.1 Allowable length and fall of IDU and ODU refrigerant piping
The connection method of IDU and ODU adopts Y-shape branch for connection, the connection, the
connection method is as follow:
L10: the distance between the first branch and the furthest IDU;
L11: the distance between the first branch and the nearest IDU;
The equivalent length of outdoor branch is 0.5m and the equivalent distance of indoor branch is 0.5m.
— Length (m) Remark
Total actual connection pipe length ≤1,000 L1+L2+L3+L4+…+L9+a+b+…+i+j
The length between ODU and the
furthest IDU
Actual length ≤200 L1+L6+L7+L8+L9+j
Equivalent length ≤240 ——
IDU*
≤120 L6+L7+L8+L9+j
The max. fall of IDU and ODU H**
ODU on the top ≤100 ——
ODU at the bottom ≤110 ——
The max. fall of IDUs h ≤40 ——
120
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