Hitachi RAM-8MQ Installation & Maintenance Manual page 16

(4) Setting of the multi-kit pipe
●
It is necessary to use optional multi-kit to prevent unit's insufficient capacity due to the uneven distribution of
the refrigerant. Do not use connectors to connect.
1) The installation of the main branch as shown below
‧ 〝 〞 ：Main Pipe (The pipe between each multi-kit or the pipe between the outdoor units and the first multi-kit)
‧Main Branch：One multi-kit is connected with other multi-kits connected with more than one indoor unit.
‧Setting Condition：The branches extending to third are allowed, but main branches can only extend to second.
Piping length within 40 m between the first branch and the indoor units :
Best installation situation
最佳安裝狀況
Second Branch
Outdoor
室外機
室外機
Second Main Branch
第 2 主分歧
First Branch
第 1 分歧
First Main Branch
第 1 主分歧
Allowing installation situation
容許安裝狀況
Outdoor
室外機
Second Branch
第 2 分歧
First Branch
第 1 分歧
Second Main Branch
First Main Branch
第 1 主分歧
Piping length in excess of 40 m between the first branch and the indoor units
‧Only one main branch is allowed, and total indoor unit capacity should be in the range of 40% to 60% for each
route after the first main branch.
Allowing installation situation
Pipe Length 40m~90m
Outdoor
71Type
First Main Branch
71Type
Third Branch
第 3 分歧
第 2 分歧
Third Branch
第 3 分歧
第 2 主分歧
Allowing installation situation
71Type
Outdoor
Indoor
y
Unit Total
First Branch
Capacity
50%
71Type
First Main Branch
71Type
Indoor
Unit Total
71Type
Capacity
50%
室外機 Outdoor
Second Branch
第 2 分歧
First Branch 第 1 分歧
Second Main Branch
第 2 主分歧
First Main Branch
第 1 主分歧
Second Branch
第 2 分歧 Third Branch
Outdoor
室外機
First Branch
第 1 分歧
First Main Branch
第 1 主分歧
71Type
Indoor
Unit Total
Capacity
33%
71Type
71Type
140Type
Indoor
Unit Total
Capacity
67%
140Type
140Type
16
Third Branch
第 3 分歧
Incorrect
錯誤
第 3 分歧
Fourth Branch 第 4 分歧
Second Main Branch
第 2 主分歧
Incorrect
錯誤
Allowing installation situation
Pipe Length 40m~90m
Outdoor Second Main Branch Third Branch
第 2 主分歧 第 3 分歧
First Main Branch