Refrigerant Piping Size - Hitachi Set Free mini-HNRQ1 Series Installation & Maintenance Manual

4.3 Refrigerant Piping Size

Example of connection: connection of 4 indoor units.
Model
RAS-3.0~6.5HNBRKQ1
RAS-7.0~8.0HNBRMQ1
RAS-10HNBRMQ1
RAS-11~12HNBRMQ1
NOTES:
Mark "▲" represent that if the liquid pipe which between the outdoor unit and the first branch is over than 70 meters, its diameter
●
should be up size. Thus the Φ9.52 diameter pipe is converted to Φ12.7 diameter pipe.
Mark " * " represent that there are pipe adapters in the outdoor unit, which is used to adjust the gas pipe between the outdoor
●
unit and the first branch. Thus the Φ19.05 diameter pipe is converted to Φ22.2 diameter pipe in the model of RAS-10HNBRMQ1,
and the Φ19.05 diameter pipe is converted to Φ25.4 diameter pipe in the model of RAS-11~12HNBRMQ1.
The piping size (L1, L2, L3, d) of indoor units differ with indoor unit model, please refer to Installation and Maintenance Manual
●
attached to each indoor unit.
Between the outdoor unit and the farthest indoor unit
Maximum Piping
Length
(Liquid Pipe)
Total liquid pipe length
Between the first branch pipe and the farthest indoor unit
Between branch pipes and connected indoor units
Outdoor unit is higher than indoor unit
Allowable Height
Difference
Outdoor unit is lower than indoor unit
Height difference between indoor units
Others The model of branch pipe▲
NOTE:
Mark "▲" represent that the model of branch pipe should be same as the requirement of the table above.
Table 4.1 Piping Size of Main Pipe
Stop Valve(mm)
Gas Liquid
Φ15.88 Φ9.52
Φ19.05 Φ9.52
Φ19.05 Φ12.7
Φ19.05 Φ12.7
Table 4.2 Piping Work Conditions
Item
24
Pipe between the outdoor unit and the first branch pipe;
The pipes between the branch pipes
Gas Liquid
Φ15.88 Φ9.52▲
Φ19.05 Φ9.52▲
Φ22.2* Φ12.7
Φ25.4* Φ12.7
Allowable Piping Length
Marks
RAS-3.0~3.5HNBRKQ1
RAS-4.0~5.0HNBRKQ1
a+b+c+d
RAS-6.0~6.5HNBRKQ1
RAS-7.0~12HNBRMQ1
RAS-3.0~3.5HNBRKQ1
RAS-4.0~5.0HNBRKQ1
a+b+c+d+
L1+L2+L3
RAS-6.0~6.5HNBRKQ1
RAS-7.0~12HNBRMQ1
b+c+d
L1,L2,L3,d
RAS-3.0~6.5HNBRKQ1
H1
RAS-7.0~12HNBRMQ1
RAS-3.0~6.5HNBRKQ1
H1
RAS-7.0~12HNBRMQ1
H2
RAS-3.0~6.5HNBRKQ1
RAS-7.0~12HNBRMQ1
Marks
a; b; c
a; b; c
a; b; c
a; b; c
≤65 meters
≤70 meters
≤85 meters
≤100 meters
≤100 meters
≤120 meters
≤150 meters
≤180 meters
≤40 meters
≤15 meters
≤30 meters
≤50 meters
≤30 meters
≤40 meters
≤15 meters
E-102SN