Mitsubishi Electric CITY MULTI PQHY-P-TLMU-A, Installation Manual

31

GB

11.2. Control box and connecting position 

of wiring

1

Heat source unit

1.  Remove the front panel of the heat source unit by unscrewing the screws, 

and pushing it up, then pulling it out.

2.  Connect the indoor - heat source transmission line to the terminal block 

7%

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

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the indoor - heat source transmission line to TB3 (M1, M2, 

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only one of the heat source units.

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

centralized control system and the heat source unit of different refrigerant 

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heat source units are connected to the same refrigerant system, daisy-chain 

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*1:  If TB7 on the heat source unit in the same refrigerant system is not 

daisy-chained, connect the transmission line for centralized control to 

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is being conducted during the power supply shut-off, daisy-chain TB7 
on the OC and OS (In the case that the heat source 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 

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

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order of capacity (If the capacity is the same, they will be in ascending 

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4.   The indoor-heat source transmission line, connect the shield ground to the 

grounding terminal (

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whose power supply connector CN41 is replaced with CN40, short circuit the 

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5.  Attach the connected wires securely with the cable strap at the bottom of the 

terminal block. External force applied to the terminal block may damage it, 

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 Caution:

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-  Poor wire contact caused by loose screws may result in overheating and 

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-  The use of the unit with a damaged circuit board may result in overheating and 

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Note:

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‡

Make sure that the spring washers are parallel to the terminal block.

‡

Make sure that the wires are securely fastened to the terminal screws. 

‡

Drive the screws straight down, and use caution not to damage the 
screw heads. 

‡

Install the ring terminals back to back so that the screws can be driven 
straight down.

‡

Make an alignment mark with a permanent marker across the screw 
head, washer, and terminal after tightening the screws.

[Fig. 11.2.1] (P.14) 

A

Power source

B

Transmission line

C

Ground terminal

[Fig. 11.2.2] (P.14) 

A

Terminal block with loose screws

B

Properly installed terminal block

C

Spring washers must be parallel to the terminal block.

[Fig. 11.2.3] (P.14) 

A

Power wires, transmission lines

B

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C

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D

Make an alignment mark.

E

Install the ring terminals back to back.

[Fig. 11.2.4] (P.14) 

A

Cable strap

B

Power source cable

C

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2

Conduit tube installation

‡

Hammer 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 
burrs and protect the tube with masking tape.

‡

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

11.3. Wiring transmission cables

1

Types of control cables

1.  Wiring transmission cables

‡

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

‡

Cable diameter: More than 1.25 mm

2

 [AWG16]

‡

Maximum wiring length: Within 200 m [656ft]

‡

Maximum length of transmission lines for centralized control and indoor/heat source transmission lines: 500 m [1640ft] at the maximum

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2.  Remote control cables

‡

ME Remote Controller

Type of remote control cable

Sheathed 2-core cable  

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Cable diameter

0.3 to 1.25 mm

2

 [AWG 22 to 16]  

(0.75 to 1.25 mm

2 

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Remarks

When 10 m [32ft] is exceeded, use cable 

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transmission cables.

* 

Connected with simple remote controller.

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CVV: PVC insulated PVC sheathed control cable

‡

MA Remote Controller

Type of remote control cable

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Cable diameter

0.3 to 1.25 mm

2 

 [AWG 22 to 16]  

(0.75 to 1.25 mm

2 

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Remarks

Within 200 m [656ft]

* 

Connected with simple remote controller.