Advertisement
In regard to the refrigerant tubing length
System Example
Outdoor unit
H3
H1
Unit main tube
No. 1 branch
Unit branch tube
Item
Allowable tubing length
Allowable elevation
difference
Allowable header
tubing length
(*1) Equivalent length
(*2) If cooling mode is expected to be used when the external temperature is 10˚C or below, install so the maximum length is 30 m.
(*3) Install so that the height difference between indoor units after the final branch is within the limits shown in the figure.
Distance (cm) from flammable materials
LA
LB
LC
L4
1
2
3
L3
LA
L4
1
2
Unit main tube
(between unit branch tubes)
L2
1
6
4 m or less
*Limit of elevation difference between
indoor units after the final branch
Symbol
L1
Maximum allowable tubing length
LA
Maximum main tubing length
Difference between longest and
L(L2 L4)
shortest tubing lengths after the
No. 1 branch (first branching point)
1,
2,
8
Maximum length of each branch tube
L5
Maximum length between outdoor units
If outdoor unit is above
H1
If outdoor unit is below
H2
Maximum difference between indoor units
H3
Maximum difference between outdoor units
Maximum length from the first
L3
tees to the front seal
(Refrigerant tubing)
: Header tube (purchased separately)
: Branch tube (purchased separately)
: T-tee (provided by installer)
: Closed (pinch) weld
L1
L2
LG
8
L2
T-tee
branch tube
8
7
Indoor unit
7
8
Over 2X
X
Actual length (m)
Details
2 way
170 (200)
120
40
Over 4 m
3 way
1
1
120 (145)
*
*
30
30
10
50
2
35
*
3
15
*
4
2
66
Advertisement
