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11.1. Caution

Follow ordinance of your governmental organization for technical standard

related to electrical equipment, wiring regulations and guidance of each
electric power company.

Wiring for control (hereinafter referred to as transmission line) shall be (5

cm or more) apart from power source wiring so that it is not in

uenced by

electric noise from power source wiring (Do not insert transmission line and
power source wire in the same conduit).

Be sure to provide designated grounding work to the outdoor unit.

Give some allowance to wiring for the electrical control box on the indoor

and outdoor units, because these boxes are sometimes removed at the time
of service work.

Never connect the main power source to the terminal block of the

transmission line. If connected, electrical parts will burn out.

Use 2-core shield cable for the transmission line. If transmission lines of

different systems are wired with the same multiplecore cable, the resultant
poor transmitting and receiving will cause erroneous operations.

Only the transmission line speci

ed should be connected to the terminal

block for outdoor unit transmission.

Erroneous connection does not allow the system to operate.

In the case of connecting with an upper class controller or to conduct group

operation in different refrigerant systems, the control line for transmission is
required between the outdoor units in different refrigerant systems.

Connect this control line between the terminal blocks for centralized control
(2-wire line with no polarity).

Grouping is set by operating the remote controller.

11.2. Control box and connecting position

of wiring

Outdoor unit

1. Remove the front panel of the control box by removing the 4 screws and

pushing it up a little before pulling it out.

2. Connect the indoor - outdoor transmission line to the terminal block (TB3) for

the indoor - outdoor transmission line.

If multiple outdoor units are connected in the same refrigerant system, daisy-
chain TB3 (M1, M2,

Terminal) on the outdoor units. Connect the indoor -

outdoor transmission line for the outdoor units to TB3 (M1, M2,

Terminal)

of only one of the outdoor units.

3. Connect the transmission lines for centralized control (between the

centralized control system and the outdoor unit of different refrigerant
systems) to the terminal block for centralized control (TB7). If the multiple
outdoor units are connected to the same refrigerant system, daisy-chain TB7
(M1, M2, S Terminal) on the outdoor units in the same refrigerant system.
(*1)
*1: If TB7 on the outdoor unit in the same refrigerant system is not daisy-

chained, connect the transmission line for centralized control to TB7 on
the OC (*2). If the OC is out of order, or if the centralized control is being
conducted during the power supply shut-off, daisy-chain TB7 on the OC
and OS (In the case that the outdoor unit whose power supply connector
CN41 on the control board has been replaced with CN40 is out of order
or the power is shut-off, centralized control will not be conducted even
when TB7 is daisy-chained).

*2: OC and OS of the outdoor units in the same refrigerant system are

automatically identi

ed. They are identi

ed as OC and OS in descending

order of capacity (If the capacity is the same, they will be in ascending
order of their address number).

4. In the case of indoor-outdoor transmission line, connect the shield ground to

the grounding terminal (

). In the case of transmission lines for centralized

control, connect it to the shield terminal (S) on the terminal block for
centralized control (TB7). Furthermore, in the case of the outdoor units
whose power supply connector CN41 is replaced with CN40, short circuit the
shield terminal (S) and the grounding terminal (

) in addition to the above.

5. Fix the connected wires securely in place with the cable strap at the bottom

of the terminal block. External force applied to the terminal block may
damage it resulting in a short circuit, ground fault, or a

re.

[Fig. 11.2.1] (P.9)

Power source

Transmission line

Earth screw

[Fig. 11.2.2] (P.9)

Cable strap

Power source cable

Transmission cable

Pillar

Conduit tube installation

Open by hammering the knockout holes for the conduit tube located on the
base and the bottom part of the front panel.

When installing the conduit tube directly through the knockout holes, remove
the burr and protect the tube with masking tape.

Use the conduit tube to narrow down the opening if there is a possibility of
small animals entering the unit.

When taking the conduit tube out from the bottom part of the unit, caulk
around the tube opening to prevent water penetration.

•

11. Wiring

(For details, refer to the installation manual of each unit and controller.)

Penetrations

[Fig. 10.4.4] (P.8)

<A> Inner wall (concealed)

<B> Outer wall

<C> Outer wall (exposed)

<D> Floor (waterproo

ng)

<E> Roof pipe shaft
<F> Penetrating portion on

re limit and boundary wall

Sleeve

Heat insulating material

Lagging

Caulking material

Band

Waterproo

ng layer

Sleeve with edge

Lagging material

Mortar or other incombustible caulking

Incombustible heat insulation material

When

lling a gap with mortar, cover the penetration part with steel plate so

that the insulation material will not be caved in. For this part, use incombustible
materials for both insulation and covering. (Vinyl covering should not be used.)

Insulation materials for the pipes to be added on site must meet the following
speci

cations:

Outdoor unit

-BC controller

High-pressure pipe

10 mm or more

Low-pressure pipe

20 mm or more

BC controller

-indoor unit

Pipe size 6.35 mm to 25.4 mm 10 mm or more
Pipe size 28.58 mm to 38.1 mm 15 mm or more

* Installation of pipes in a high-temperature high-humidity environment, such

as the top

oor of a building, may require the use of insulation materials

thicker than the ones speci

ed in the chart above.

* When

certain

speci

cations presented by the client must be met, ensure that

they also meet the speci

cations on the chart above.

•

10.4. Thermal insulation of refrigerant

piping

Be sure to add insulation work to refrigerant piping by covering high-pressure
pipe and low-pressure pipe separately with enough thickness heat-resistant
polyethylene, so that no gap is observed in the joint between indoor unit and
insulating material, and insulating materials themselves. When insulation work is
insuf

cient, there is a possibility of condensation drip, etc. Pay special attention

to insulation work in the ceiling plenum.

[Fig. 10.4.1] (P.8)

Steel wire

Piping

Asphaltic oily mastic or asphalt

Heat insulation material A

Outer covering B

Heat

insulation

material A

Glass