Electrical Work; Caution - Mitsubishi Electric CITY MULTI PQRY-P250 Installationshandbuch

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9. Electrical work

9.1. Caution

1 Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each

electric power company.

Warning:

Be sure to have authorized electric engineers do electric work using special circuits in accordance with regulations and this installation

manual. If power supply circuit has a lack of capacity or electric work deficiency, if may cause an electric shock or fire.

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 heat source unit.

Caution:

Be sure to put heat source unit to earth. Do not connect earth line to any gas pipe, water pipe, lightning rod or telephone earth line. If earth

is incomplete, it may cause an electric shock.

4 Give some allowance to wiring for electrical part box of indoor and heat source 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 be burnt 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 heat source unit transmission.

(Transmission line to be connected with indoor unit : Terminal block TB3 for transmission line, Other : Terminal block TB7 for centralized control)

Erroneous connection does not allow the system to operate.

8 In case to connect with the upper class controller or to conduct group operation in different refrigerant systems, the control line for transmission is

required between the heat source units each other.

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

When conducting group operation in different refrigerant systems without connecting to the upper class controller, replace the insertion of the short

circuit connector from CN41 of one heat source unit to CN40.

9 Group is set by operating the remote controller.

A Heat source unit

B Transmission line (2-core shielding cable)

C BC controller

D Indoor unit

E Remote controller

F Transmission line (2-core shielding cable)

A Transmission line for centralized control (required for the group operation