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3. Electrical Wiring
[3.1 Standard Wiring]
1) Attach the ring core (color: black, accessory) when installing the
indoor unit as follows.
[Procedures]
Insert the control cable into the hole of ring core and wind it at
two turns as shown in the right figure before connecting it to the
terminal block. Fix the control cable with the band (accessory).
[3.2 Electrical Wiring for Multiple Units]
ATTENTION:
Disconnect all power at the main power source before performing electrical work. Failure to do this can result in fire,
damage to internal components and severe or fatal electrical shock.
Electrical Box
Controller
of Indoor Unit
Terminal Block
A
B
M3.5
A
B
Screws
M3
Screws
Twist Pair Cable with Shield Tube: 1P- 0.75mm
A. Communication cabling shall be a twist pair cable with shield tube (1P-0.75mm
length is 500m)
Shielded cable must be considered for applications and routing in areas of high EMI and other sources of potentially
excessive electrical noise to reduce the potential for communication errors. When shielded cabling is applied, proper
bonding and termination of the cable shield is required as per HITACHI guidelines. Plenum and riser ratings for
communication cables must be considered per application and local code requirements. The use of any other grade
of cable other than that specified above can result in damage from electronic interference (EMI).
B. Maintain a distance more than 30cm between the communication cables, (controller cable and communication
cables) and power source of the indoor units. If this is not done, the unit can malfunction due to electromagnetic
interference (EMI) generated by incoming power cables from the power source.
C. In systems where multiple indoor units are in synchronized control under a single controller, assign the refrigerant
cycle numbers and address for indoor units without duplication.
D. Refer to the "Unit No. Setting" of each Installation and Maintenance manual provided with indoor unit when
performing electrical wiring work between the controller and indoor units for setting the refrigerant cycle number and
the indoor unit address.
E. No gap should exist between the controller cable and the cable access inlet of the controller box casing. If there is a
gap, cover and seal the gap with vinyl tape. Failure to insulate against the penetration of moisture and insects can
result in degraded performance and damage to the unit.
F. If case of operating with two controllers (Primary and Secondary), set the primary and secondary controllers by
selecting the appropriate function for those controllers. Refer to Section 5. After this is set, turn OFF the power
supply to all indoor units connected to these controllers.
G. The control timer cannot be used together with this controller.
P5417086
Max. 16 Indoor Units
Electrical Box
of Indoor Unit
Terminal Block
A
B
M3.5
Screws
or more
2
TB2
● Remote Control Cable <Option>
Model: PRC-
Controller
(Secondary)
Twist Pair Cable (1P-0.75mm
A
B
50mm
The number of
(
= 2, 3, 5, 8, 10, 15, 20, 30, 50, 75, 100).
The cable of 30m and over is available by ordering.
(Contact the closest branch of HITACHI.)
A
B
1
2
Band
Ring Core
K
Solderless Terminal
)
2
(X Type)
Diameter: φ7
Color: Ivory
100mm
indicates the length (m) of the cable
or more). (The maximum total cable
2
Control Cable
1.25-3X
7
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