Справочник Пользователя для Mitsubishi Electronics puhy-ep-yjm-a(-bs)

GB

1

  Follow ordinance of your governmental organization for technical standard 

related to electrical equipment, wiring regulations and guidance of each 

electric power company.

2

  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 influenced by 

electric noise from power source wiring (Do not insert transmission line and 

power source wire in the same conduit).

3

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

4

  Give some allowance to wiring for electrical part box of indoor and outdoor 

units, because the box is sometimes removed at the time of service work.

5

  Never connect the main power source to terminal block of transmission line. 

If connected, electrical parts will burn out.

6

  Use 2-core shield cable for 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.

7

  Only the transmission line specified should be connected to the terminal 

block for outdoor unit transmission.

 

Erroneous connection does not allow the system to operate.

8

  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).

9

  Group is set by operating the remote controller.

1

 

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, 

OS1, and OS2 (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, OS1, and OS2 of the outdoor units in the same refrigerant system 

are automatically identified. They are identified as OC, OS1, and OS2 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 fire.
[Fig. 11.2.1] (P.9) 

A

Power source

B

Transmission line

C

Earth screw

A

Cable strap

B

Power source line

C

Transmission line

D

Pillar

2

 

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.

1

 

1.  Wiring transmission cables

Types of transmission cables: Shielding wire CVVS, CPEVS or MVVS

• 

Cable diameter: More than 1.25 mm

• 

2

 

Maximum wiring length: Within 200 m

• 

Maximum length of transmission lines for centralized control and indoor/

• 

outdoor transmission lines (Maximum length via outdoor units): 500 m MAX

 

The maximum length of the wiring between power supply unit for 

transmission lines (on the transmission lines for centralized control) and 

each outdoor unit and system controller is 200 m.

2.  Remote control cables

Kind of remote control cable

Sheathed 2-core cable (unshielded) CVV

Cable diameter

0.3 to 1.25 mm

2

 (0.75 to 1.25 mm

2

)*

Remarks

When 10 m is exceeded, use cable with 

the same specifications as 1. Wiring 

transmission cables. 

Kind of remote control cable

Sheathed 2-core cable (unshielded) CVV

Cable diameter

0.3 to 1.25 mm

2

 (0.75 to 1.25 mm

2

)*

Remarks

Within 200 m

*  Connected with simple remote controller.

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

When filling 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 

mate rials 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 

• 

specifications:

Pipe size

ø6.35 to 25.4 mm

ø28.58 to 41.28 mm

Thickness

10 mm min.

15 mm min.

Temperature Resistance

100°C min.

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

as the top floor of a building, may require the use of insulation materials 

thicker than the ones specified in the chart above.

*  When certain specifications presented by the client must be met, ensure that 

they also meet the specifications on the chart above.

<A> Inner wall (concealed)

<B> Outer wall

<C> Outer wall (exposed)

<D> Floor (waterproofing)

<E> Roof pipe shaft

<F> Penetrating portion on fire limit and boundary wall
A

Sleeve

B

Heat insulating material

C

Lagging

D

Caulking material

E

Band

F

Waterproofing layer

G

Sleeve with edge

H

Lagging material

I

Mortar or other incombustible caulking

J

Incombustible heat insulation material

Be sure to add insulation work to refrigerant piping by covering liquid pipe and 

gas 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 insufficient, there is a 

possibility of condensation drip, etc. Pay special attention to insulation work in 

the ceiling plenum.

A

Steel wire

B

Piping

C

Asphaltic oily mastic or asphalt

D

Heat insulation material A

E

Outer covering B

Heat 

insulation 

material A

Glass fiber + Steel wire
Adhesive + Heat - resistant polyethylene foam + Adhesive tape

Outer 

covering B

Indoor

Vinyl tape

Floor exposed Water-proof hemp cloth + Bronze asphalt

Outdoor

Water-proof hemp cloth + Zinc plate + Oily paint

A

Liquid pipe

B

Gas pipe

C

Electric wire

D

Finishing tape

E

Insulator

WT05962X01_GB.indd   19

2010/08/26   19:21:00