Toshiba HFC R-410A Wiring design, General, Outdoor unit power supply, Electrical wiring design

6.Wiring design

1. General

(1)Perform wiring of the power supply in conformance with the regulations of the local electric company.

(2)For the control wires connecting indoor units, outdoor units, and between indoor and outdoor units, use of double-core shielded wires is recommended to prevent noise disturbance.

(3)Be sure to set the earth leakage breaker and the switches to the power supply section of the indoor unit.

(4)Supply power to each outdoor unit and provide an earth leakage breaker or hand switch for each outdoor unit.

(5)Never connect the 220–240 V power to the terminal block (U1, U2, U3, U4, U5, U6) for control cables, as this will cause problems.

(6)The control wiring system and refrigerant piping system should be in the same line.

(7)Arrange the cables so that the power cables do not come into contact with the high-temperature part of the pipe; otherwise the coating may melt and cause an accident.

(8)Do not turn on the power to the indoor unit until the refrigerant pipes have been completely evacuated.

2. Outdoor unit power supply

•Select the power supply cabling and fuse of each outdoor unit from the following specifications: 5-core cable, in accordance with 60245 IEC 66.

•Connect the outdoor units via the incorporated terminal block (L1, L2, L3, N).

Outdoor unit power supply 3-phase, 380-415 V, 50 Hz

3. Electrical wiring design

	3-phase	Earth
	50 Hz, 380-415 V
	Earth leakage breaker
	manual switch
	Outdoor unit
	power source
	Indoor unit	Junction box
	power source
	Single-phase
	50 Hz, 220-240 V
	Earth leakage breaker
	power switch
Model	Outdoor unit power supply
MMY-AP***T8, HT8	3-phase, 380-415 V, 50 Hz

Unit capacities and power supply wire sizes (reference)

Model		Power supply wiring
MMY-		Wire size	Field-supplied fuse
MAP0501T8	MAP0501HT8	3.5 mm² (AWG #12) Max. 26 m	20 A
MAP0601T8	MAP0601HT8	3.5 mm² (AWG #12) Max. 26 m	20 A
MAP0801T8	MAP0801HT8	3.5 mm² (AWG #10) Max. 20 m	30 A
MAP1001T8	MAP1001HT8	5.5 mm² (AWG #10) Max. 28 m	30 A
MAP1201T8	MAP1201HT8	5.5 mm² (AWG #10) Max. 27 m	30 A

•Determine the wire size for the indoor unit according to the number of connected indoor units downstream.

•Observe local regulations regarding wire size selection and installation.

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