EG
6. HOW TO PROCESS TUBING (Only for PACKAGE Outdoor Units)
12
Multi type (Twin, Triple, Quartet)
Installation Example 1
Installation Example 2
0483_M_I
L3
L2
3
2
LA
1
T-joint
0482_M_I
L1
L2
LB
LC
1
2
H1
H2
LA
3
4
Select and decide the installation location so that the length of the
refrigerant tubing will be within the limits given in Table.
Symbol meanings:
: Optional distribution joint kit (DDV1912)
: T-joint (field supply)
: Weld solidly (pinch shut)
+
I t e m s
Marks
Length (m)
Allowable tubing length
L1
Maximum tubing length
Actual length
≤
50
Equivalent length
≤
70
L2
Maximum length from the No. 1 distribution joint
≤
20
l
1,
l
2,
l
3,
l
4
Maximum length of each distribution branch
≤
20
l
1,
l
2,
l
3
Total tubing lenght including lenght of each distribution
≤
70
+ L1
branch
Max. allowable tubing length including lenght of each
≤
30*
distribution branch at shipment
Allowable elevation
H1
When outdoor unit installed higher
≤
50
difference
When outdoor unit installed lower
≤
30
H2
Maximum difference between indoor units
≤
4
Allowable lenght of
L3
Maximum tubing lenght between the first T-joint and
≤
1
header tube
terminated (weld shut) end point
Contents
* If total tubing length including length of each distribution branch becomes 30 to 70 m, additional refrigerant charge is required.
See table below.
CAUTION
In case of multi type installation, indoor units should be installed in the same room. If indoor units are installed in different rooms,
temperature control may develop problems because the system operation follows the thermostat condition of one indoor unit
(main unit).
6-2.
Tubing size
Main Tubing Size (L1, LA, LB, LC)
Main tube (LB, LC) OD
GRV25x
GRV36,48x
Wide tube
15.88 (5/8)
19.05 (3/4)
19.05 (3/4) (or 15.88 (5/8))*
Narrow tube
9.52 (3/8)
9.52 (3/8)
9.52 (3/8)
Required additional
50
50
50
refrigerant (g/m)
Multi type (twin, Triple, Quartet)
Main tube (LA) OD
Distribution Branch Size (
ll 11
,
ll 22
)
Indoor unit type
9 type
12 type
18 type
25 type
36 type
48 type
Wide tube
Narrow tube
Required additional
refrigerant (g/m)
9.52 (3/8) *
50
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
NOTE
* In case of 25 type, use the “Tube connector” (accessory supplied with the indoor unit) for sizing up narrow tube from 6.35 to 9.52.
6-1.
Tubing Length
