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8
PIPING MODEL SELECTION
8.1Allowable pipe length and height difference among indoor and outdoor units
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown in the
figure below.
Unit : m
L10: Length from the first branch to the farthest IDU;
L11: Length from the first branch to 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 length (actual length) of tting pipe ≤1,000 L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest tting pipe(m)
Actual length ≤200
L1+L6+L7+L8+L9+j
Equivalent length ≤240 ——
Equivalent length from the rst branch to the furthest indoor unit* ≤120 L6+L7+L8+L9+j
Height difference between outdoor unit
and indoor unit H**
Outdoor unit at upper ≤100 ——
Outdoor unit at lower ≤110 ——
Height difference between indoor units ≤30 ——
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