Unit installation

July 2008 Application Note 1002
©2012 Mitsubishi Electric US, Inc.
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1. All MS-A indoor units must be powered from the outdoor unit.
(Indoor unit cannot be powered from a separate source)
2. Outdoor unit power is 115 VAC using a two-conductor wire with ground.
3. Indoor unit power is from the outdoor unit from a terminal block marked to the indoor
unit.
4. Connect the indoor unit to the outdoor unit on terminals L1, N, 2, and ground. Use
copper conductors only.
5. A three pole disconnect switch may be used for shut off or service between the
indoor and outdoor unit as shown in Figure 1.
Figure 1. 3 pole switch part # TAZ-MS303
Note: All wiring shall comply with NEC and local electrical codes.
Refer to unit installation manual for more details.
CONNECTING WIRES AND CONNECTING GROUND WIRE
 Use a solid conductor or stranded conductor AWG14.
 Use doubled insulated copper wire with 300 volt
insulation.
 Use copper conductors only.
 Follow national and local electrical code.
POWER SUPPLY CABLE AND GROUND WIRE
 Use solid or stranded conductor AWG12** or AWG14
wire.
 Use copper conductors only.
 Follow national and local electrical code.
Due to continuing improvement, above specification may be subject to change without notice.
2013 P-Series and M-Series - Application Notes (June 2013)
APP-5