En-14
(3) After all the gas is vented, melt the brazing filler metal on connecting part using a
torch and remove the pinch pipe.
6.3.3 Pipe connection
CAUTION
Seal the pipe route hole with duct seal (locally purchased) such that there are no gaps.
Small insects or animals that are trapped in the outdoor unit may cause a short circuit in the
electrical component box.
To prevent pipe damage; do not make sharp bends. Bend the pipe at a radius of 3 in (70
mm) or greater.
Do not bent pipe many times at same part to prevent break.
After completing all the pipe connection by brazing, perform the indoor unit pipe connec-
tion with a flare joint.
When removing the pinch pipe or brazing the joint pipe, carry out the work while cooling
down the 3-way valve sufficiently.
• Braze the joint pipe onto the 3-way valves at the liquid, suction gas and discharge gas
side.
Install the joint pipe appropriately so that it can be connected easily with the main pipe.
• Braze the joint pipe and the on-site piping.
* Be sure to supply nitrogen when brazing.
Front piping
For Heat Pump system For Heat Recovery system
Joint pipe
(locally
purchased)
Joint pipe
(accessory)
Liquid pipe (locally purchased)
Gas pipe (locally purchased)
Duct seal (locally
purchased)
Joint pipe
(locally
purchased)
Joint pipe
(accessory)
Joint pipe
(accessory)
Suction gas pipe
(locally purchased)
Discharge gas pipe
(locally purchased)
Liquid pipe (locally purchased)
Duct seal (locally
purchased)
Bottom piping
For Heat Pump system For Heat Recovery system
Joint pipe
(locally
purchased)
Joint pipe
(accessory)
Liquid pipe
(locally
purchased)
Gas pipe (locally
purchased)
Duct seal
(locally
purchased)
Joint pipe
(locally
purchased)
Joint pipe
(accessory)
Liquid pipe
(locally pur-
chased)
Joint pipe
(accessory)
Suction gas pipe
(locally purchased)
Discharge gas
pipe (locally
purchased)
Duct seal
(locally
purchased)
For details of the joint pipes, refer to “2.3. Accessories”.
6.4. Multiple connections
CAUTION
• When connecting multiple (maximum 3) units, be sure to install the unit with the larg-
est capacity nearest to the indoor unit.
• When connecting multiple units, set the unit with the largest capacity as the primary unit,
and the rest as the subordinate units.
(Refer to “8. FIELD SETTING”)
• When connecting multiple units, use the optional outdoor unit branch kit.
Outdoor unit capacity
2 Units : Unit 1 ≥ Unit 2
3 Units : Unit 1 ≥ Unit 2 ≥ Unit 3
For Heat Pump system
(*1)
To indoor unit
(To main pipe)
To indoor
unit
Outdoor unit branch kit (Optional)
Liquid pipe (locally
purchased)
Gas pipe (locally
purchased)
To outdoor unit
To outdoor unit
Outdoor unit 1
(Primary)
Outdoor unit 2
(Subordinate 1)
Outdoor unit 3
(Subordinate 2)
*1: If necessary, use the joint pipe (accessory) for the liquid pipe. However not used for
AOUA144, and it is not included with the model AOUA120.
For Heat Recovery system
(*1)
To indoor unit
(To main pipe)
To indoor
unit
Outdoor unit branch kit (Optional)
Liquid pipe (locally
purchased)
Discharge gas pipe
(locally purchased)
Suction gas pipe
(locally purchased)
To outdoor unit
To outdoor unit
Outdoor unit 1
(Primary)
Outdoor unit 2
(Subordinate 1)
Outdoor unit 3
(Subordinate 2)
*1: If necessary, use the joint pipe (accessory) for the liquid pipe. However not used for
AOUA144, and it is not included with the model AOUA120.
Branch kit restriction when install
Be sure following restriction.
(1) Installation angle
Install the outdoor unit branch kit horizontally level, within 0° to -10°, so that the refrigerant
separates evenly.
To indoor unit
To outdoor unit
To outdoor unit or next branch kit
PROHIBITED
PROHIBITED
PROHIBITED
PROHIBITED
GOOD:
0° to -10°
GOOD:
0° to -10°
Do not install
the outdoor
unit branch kit
vertically.
PROHIBITED PROHIBITED PROHIBITED
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