En-15
(2) Straight pipe length
Leave the distance 2 ft (0.5 m) or more for straight part to outdoor unit branch kit.
To indoor unit
(To main pipe)
To outdoor uni t
To outdoor unit
To outdoor
unit
2 ft (0.5 m) or more
2 ft (0.5 m) or more
To indoor unit (To main pipe)
To outdoor unit
To outdoor
unit
(3) About the connecting curvature of field pipe and branch kit:
The field pipe should
be connected to the
branch kit so that
the curved angle on
each side is 3 degree
or less.
0.5 m
*: Allowed value based on “A” (center
of field pipe) at 19-11/16 in (0.5 m)
from “B” (junction of the branch kit).
* 0 to 1 in
(0 to 26 mm)
* 0 to 1 in
(0 to 26 mm)
(4) For details, refer to the Installation Instruction Sheet of the outdoor unit branch kit.
(Example 3)
(Example 1)
(Example 2)
(Primary)
(Primary)
(Primary)
(Subordinate 1)
(Subordinate 1)
(Subordinate 1)
(Subordinate 2)
(Subordinate 2)
(Subordinate 2)
Examples of multiple unit installation
(5) Examples of multiple unit installation are shown below.
CAUTION
To prevent the oil from settling in the stopped unit, install the pipes between the outdoor
units so that they are level or are tilted upward to the outdoor units.
Installable
patterns
(Primary)
(Primary)
(Primary)
(Subordinate 1)
(Subordinate 1)
(Subordinate 1)
(Subordinate 2)
(Subordinate 2)
(Subordinate 2)
GOOD
GOOD
GOOD
To indoor unit
To indoor unit
To indoor unit
Non-install-
able patterns
(Primary)
(Primary)
(Primary)
(Subordinate 1)
(Subordinate 1)
(Subordinate 1)
(Subordinate 2)
(Subordinate 2)
(Subordinate 2)
To indoor unit
To indoor unit
To indoor unit
PROHIBITED
PROHIBITED
PROHIBITED
(6) If the pipe length between outdoor unit branch kit and outdoor unit branch kit (or sub-
ordinate unit) is longer than 2 m, or a lower pipe line exists between outdoor units,
rise for gas pipe (in the heat recovery system, Discharge gas pipe and Suction gas
pipe) should be arranged to eliminate oil from entering into and remaining at pipes
and the stopped outdoor unit.
However, there is no need to provide a rise on the pipe connecting between the
primary unit and the indoor unit even if the length exceeds 6 ft (2 m).
To indoor unit
L1 or less
L1 or less
Suction gas pipe
Discharge gas pipe
L1: 6 ft (2 m)
L2: 8 in (200 mm)
L3: 19 in (500 mm)
To indoor
unit
Rise
(L2 or more)
Suction gas pipe
Discharge gas pipe
L1 or more L1 or more
L1 or less L1 or less
Suction gas pipe
Discharge gas pipe
Rise
Lower pipe
To indoor unit
L3 or less
(Primary)
(Primary)
(Primary)
(Subordinate 1)
(Subordinate 1)
(Subordinate 1)
(Subordinate 2)
(Subordinate 2)
(Subordinate 2)
7. ELECTRICAL WIRING
7.1. The precautions of electrical wiring
WARNING
Wiring connections must be performed by a qualified person in accordance with speci-
fications.
208/230 V model: AOUA72/96/120/144/168/192ULBV5
The rated supply of this product is 60 Hz, 208/230 V of 3-phase (3-cable system). Use a
voltage within the range of 187 to 253 V.
460 V model: AOUA72/96/120/144/168/192ULCV5
The rated supply of this product is 60Hz, 460 V of 3-phase (3-cable system). Use a volt-
age within the range of 414 to 506 V.
Make sure to perform grounding (earthing) work. Improper grounding (earthing) work
can cause electric shocks.
Before connecting the cables, make sure the power supply is OFF.
Be sure to install an ground (earth) leakage breaker. Otherwise, it will cause electric
shock or fire.
Be sure to install a breaker of the specified capacity. When selecting breaker, please
comply with the laws and the regulations of each country. One breaker must be installed
on the power supply of the outdoor unit. Wrong selection and setup of the breaker will
cause electric shock or fire.
Do not connect AC power supply to the transmission line terminal block.
Improper wiring can damage the entire system.
Connect the connector cord securely to the terminal.
Faulty installation can cause a fire.
Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or fire by poor connection, insufficient insulation or over current.
Make sure to secure the insulation portion of the connector cable with the cord clamp. A
damaged insulation can cause a short circuit.
Never install a power factor improvement condenser. Instead of improving the power factor,
the condenser may overheat.
Before servicing the unit, turn the power supply switch OFF. Then, do not touch electric
parts for 10 minutes due to the risk of electric shock.
Always use a separate power supply line protected by a circuit breaker operating on all
cables with a distance between contact of 1/8 in (3 mm) for this unit.
Use Ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause serious damage inside the
unit.
Securely install the electrical box cover on the unit. An improperly installed service panel
can cause serious accidents such as electric shock or fire through exposure to dust or
water.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
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