En-15
4.7.6. MULTIPLE CONNECTIONS
CAUTION
• When connecting multiple units (3 units maximum), make sure the master unit has the maximum capacity in
the system.
Example:
When connecting multiple outdoor units, designate one of them to be the master unit and others to be the
slave units. It is not possible to connect master units in multiples. As shown in the diagram, arrange the
outdoor units so that the master unit should be installed closest to the indoor unit. (Figs. 4.7-9, 10, 11, 12) Use
outdoor unit branch kit (optional) to connect multiple units.
Fig. 4.7-9 Front piping
Outdoor Capacity
2 Unit : Master
>
=
Slave 1
3 Unit : Master
>
=
Slave 1
>
=
Slave 2
OK
No
Good
Master + Slave 1 + Slave 2
AJ 126LBTF + AJ 126UBTF
AJ A90LBTF + AJ A72UBTF
AJ 126LBTF + AJ 126UBTF + AJ A90UBTF
AJ A72LBTF + AJ A72UBTF
AJ A90LBTF + AJ 126UBTF
AJ A72LBTF + AJ A90UBTF + AJ A90UBTF
Outdoor unit branch
kit (Optional)
Liquid pipe
(Field supply)
Gas pipe (Field supply)
Oil pipe
(Field supply)
Flange joint
assembly
(Accessory)
Joint pipe
(Accessory)
To outdoor unit
To outdoor unit
To indoor unit
(To main pipe)
To indoor unit
Outdoor unit
(Master)
Outdoor unit
(Slave 1)
Outdoor unit
(Slave 2)
Vertical
or
NO GOOD NO GOOD NO GOOD
CAUTION
• Be sure to follow the installation restrictions for the outdoor unit branch kit and install it according to the
conditions at the installation location.
• Install the outdoor unit branch kit horizontally, within ±10°, so that the refrigerant separates evenly.
Do not install the outdoor unit branch kit vertically.
Horizontal
NO
GOOD
OK
NO
GOOD
NO
GOOD
OK
NO
GOOD
±10°
±10°
• Leave the distance 0.5 m or more for straight part to outdoor unit branch kit.
• For details, refer to the Installation Instruction Sheet of the outdoor unit branch kit.
Outdoor unit branch kit
To outdoor unit
To indoor unit
(To main pipe)
To outdoor unit
0.5 m or more
To indoor unit (To main pipe)
To outdoor
unit
To outdoor unit
0.5 m or more
To outdoor unit
9374241033_IM_en_p01-17.p65 26/8/2008, 18:2315
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