Wiring Design - Toshiba MMS Series Design Manual

1-6. WIRING DESIGN

1. General
(1) Observe the local Electrical Equipment Engineering Standard and Indoor Wiring Regulation.
(2) The refrigerant piping and corresponding control wiring should be routed closely together.
(3) For the control wires connecting indoor units, outdoor units, and between indoor and outdoor units, use of
double-core shielded wires (MVVS: 1.25 mm
(4) Be sure to set the earth leakage breaker and the switches to the power supply section of the indoor unit.
(5) Supply power to each outdoor unit via a dedicated branch circuit and provide an earth leakage breaker and hand
switch for each outdoor unit. Outdoor units require Class D grounding.
(Outdoor units use a 3-phase 50Hz 380/400/415V, or
(6) See the table below for the wire sizes and earth leakage breaker/hand switch specifications.
* Provide separate power supplies for indoor and outdoor units.
2. Electrical wiring design
3-phase
50Hz 380/400/415V
or 60Hz 380V
Earth leakage breaker
Handy switch
Outdoor
power source
Indoor
power source
Single phase
50Hz 220/230/240V
or 60Hz 220V
Earth leakage breaker
power switch
• Unit capacities and power supply wire sizes (Reference)
MMY-MP0801T8 MMY-MP0801HT8
MMY-MP1001T8 MMY-MP1001HT8
MMY-MP06018 MMY-MP0601H8
MMY-MP08018 MMY-MP0801H8
MMY-MP10018 MMY-MP1001H8
• Determine the wire size for indoor unit according to the number of connected indoor units downstream.
• Observe local regulation regarding wire size selection and installation.
3. For Indoor unit power supply (Must be independent from outdoor unit power.)
Item
Model
All models of indoor units
NOTE :
The connecting length indicated in the table represents the length from the pull box to the outdoor unit when the indoor
units are connected in parallel for power, as shown in the above illustration. A voltage drop of no more than 2% is also
assumed. If the connecting length will exceed the length indicated in the table, select the wire thickness in accordance
with local wiring standards.
2
Earth
Model
MMY-MP0801HT7
MMY-MP1001HT7
MMY-MP0601H7
MMY-MP0801H7
MMY-MP1001H7
2.0mm² (AWG#14) Max. 20m
min.) is recommended to prevent interference.
60Hz 380V power supply.)
Pull box
Wire size
5.5 mm² (AWG #10) Max. 23 m
5.5 mm² (AWG #10) Max. 23 m
3.5 mm² (AWG #12) Max. 20 m
5.5 mm² (AWG #10) Max. 23 m
5.5 mm² (AWG #10) Max. 23 m
Power supply wiring
Wire size
3.5mm² (AWG#12) Max. 50m
1-22
Power supply wiring
Field fuse
Field fuse
35 A
40 A
30 A
35 A
40 A
15A