Hitachi RAS-6HVRNM2 - Pipe Size Selection and Branch Piping

2-98
TC-12001
OUTDOOR UNIT
22
P5414950-rev.1
Outdoor
Unit
Piping Size
A B1-B5 C1-C2
Gas Liquid
Indoor Unit Capacity
Total Indoor Unit Capacity
after
4
Branch Pipe
1.0-1.5HP 2.0HP 2.5-7.0HP
< 2.5HP > 2.5HP
Gas
Liquid Gas Liquid Gas Liquid Gas Liquid Gas Liquid
3HP
I
15.88
I
9.52
I
12.7
I
6.35
I
15.88
I
6.35
I
15.88
I
9.52

4-7HP
I
15.88
I
9.52
I
12.7
I
6.35
I
15.88
I
6.35
I
15.88
I
9.52
I
12.7
I
6.35
I
15.88
I
9.52
6.3 Pipe Selection
(1) Select the piping as followings according to the combination of the outdoor unit and the indoor unit(s).
In the case that more than 5 indoor units are connected to the outdoor unit, select the line branch.
(Refer to “Piping Work for Line Branch” on the next page.)
O
Piping Size Selection
Outdoor
Unit
Piping Length
Height
Difference
between
O.U. and I.U.
Branch Piping
Max. Piping Length
Total Piping Length
Piping
Length
after 1st
Branch
Main Piping
Length A
(Twin, Triple,
Quad)
O.U. is
Higher.
O.U. is
Lower.
Twin Triple Quad
Total Actual Length of
All Liquid Piping
1 2 3
4
L1
Twin Triple Quad
Actual
Length of
B or B+C
Total I.U.
Capacity after
Branch Piping
Actual
Length
Equivalent
Length
< 2.5HP > 2.5HP
3HP
50 70 60 - - 10
Take enough
Length more
than B-C
30 20
TW-
52AN
- - - -
4-6HP 75 95 85 95 95 10 30 20
TW-
52AN
TG-
53AN
TW-
52AN
TW-
22AN
TW-
52AN
7HP 75 95 - - - - - 30 20 - - - - -
I.U.: Indoor Unit, O.U.: Outdoor Unit
O
Piping Length and Branch Piping Selection
NOTES:
1) The liquid piping and the gas piping shall be the same piping length and the same piping way.
2) Install the branch piping near the indoor unit.
3) Install the branch piping to be the equal piping length to each indoor unit (B1=B2=B3, B4=B5, C1=C2).
If the piping length is not equal because of building structure, the difference of the piping length shall be within 8m.
(B1-B2), (B2-B3), (B3-B1), (B4-B5) = within 8m
(B1+C1) – (B4+C2), (B1+C1) – (B5+C2), (B2+C1) – (B4+C2), (B2+C1) – (B5+C2) = within 8m
4) Install the piping which the height difference of the piping length between the indoor units should be 0.
If the height difference is not 0 because of building structure, the difference of the piping length should be within 10m.
Single Type Twin Type
Triple Type Quad Type
L1
A=L1
L1
A
B1
B2
1
L1
A
B1
B2
B3
2
L1
A
B
1
B5
B4
B2
C1
C2
3
4
4