Wiring; Caution; Wiring Transmission Cables; Wiring Of Main Power Supply And Equipment Capacity - Mitsubishi Electric PUMY-P125YMA Installation Manual

Example of a group operation system with multiple outdoor units (Shielding wires and address setting are
necessary.)
<Examples of Transmission Cable Wiring>
[Fig. 9.3.1] M-NET Remote Controller (P.5)
[Fig. 9.3.2] MA Remote Controller (P.5)
A Group 1 B Group 3
( ) Address
<Wiring Method and Address Settings>
a. Always use shielded wire when making connections between the outdoor unit (OC) and the indoor unit (IC), as well for all OC-OC, and IC-IC wiring intervals.
b. Use feed wiring to connect terminals M1 and M2 and the ground terminal on the transmission cable terminal block (TB3) of each outdoor unit (OC) to terminals M1, M2
and terminal S on the transmission cable block of the indoor unit (IC).
c. Connect terminals 1 (M1) and 2 (M2) on the transmission cable terminal block of the indoor unit (IC) that has the most recent address within the same group to the
terminal block on the remote controller (RC).
d. Connect together terminals M1, M2 and terminal S on the terminal block for central control (TB7) for the outdoor unit (OC).
e. On one outdoor unit only, change the jumper connector on the control panel from CN41 to CN40.
f. Connect the terminal S on the terminal block for central control (TB7) for the outdoor unit (OC) for the unit into which the jumper connector was inserted into CN40 in Step
above to the ground terminal
g. Set the address setting switch as follows.
* To set the outdoor unit address to 100, the outdoor address setting switch must be set to 50.
Unit Range
IC (Main) 01 to 50
IC (Sub) 01 to 50
Outdoor Unit 51 to 100
M-NET R/C (Main) 101 to 150
M-NET R/C (Sub) 151 to 200
MA R/C
h. The group setting operations among the multiple indoor units is done by the remote controller (RC) after the electrical power has been turned on.
<Permissible Lengths>
1 M-NET Remote controller
• Max length via outdoor units: L +L
1
• Max transmission cable length: L
Remote controller cable length: r
•
If the length exceeds 10 m, use a 1.25 mm
maximum length and overall length.
2 MA Remote controller
• Max length via outdoor unit (M-NET cable): L
• Max transmission cable length (M-NET cable): L
• Remote controller cable length:c

9.4. Wiring of main power supply and equipment capacity

Schematic Drawing of Wiring (Example)
[Fig. 9.4.1] (P.5)
A Switch (Breakers for Wiring and Current Leakage)
C Pull Box
Thickness of Wire for Main Power Supply and On/Off Capacities
Main Cable
Model
Outdoor Unit (P)125
Indoor Unit
1. Use a separate power supply for the outdoor unit and indoor unit.
2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.
3. The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank thicker consideration of voltage drops.
Make sure the power-supply voltage does not drop more than 10 %.
4. Specific wiring requirements should adhere to the wiring regulations of the reglon.
5. Power supply cords of parts of appliances for outdoor use shall not be lighter than polychloroprene sheathed flexible cord (design 245 IEC57). For example,
use wiring such as YZW.
Warning:
• Be sure to use specified wires to connect so that no external force is imparted to terminal connections. If connections are not fixed firmly, it may cause
heating or fire.
• Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.

Caution:

• Some installation site may require attachment of an earth leakage breaker. If no earth leakage breaker is installed, it may cause an electric shock.
• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large capacity may cause a malfunction
of unit or fire.
C Group 5
in the electrical component box.
Use the most recent address within the same group of indoor units
Use an address, other than that of the IC (Main) from among the units within the same group of indoor units. This must be
in sequence with the IC (Main)
Use the most recent address of all the indoor units plus 50
Set at an IC (Main) address within the same group plus 100
Set at an IC (Main) address within the same group plus 150
– Unnecessary address setting (Necessary main/sub setting)
+L +L and L +L +L +L and L +L
2 3 4 1 2 3 5 1
and L +L and L +L and L and L
1 3 4 3 5 6 2
, r , r , r
10 m (0.3 to 1.25 mm
=
1 2 3 4
+L +L +L and L +L +L
1 2 3 4 1 2
and L +L and L and L
1 3 4 6
and c +c +c and c +c +c +c
1 1 2 3 1 2 3
B Outdoor Unit
D Indoor Unit
Minimum Wire Thickness (mm 2 )
Branch Ground
2.5 – 2.5
1.5 1.5 1.5
D Shielded Wire
Setting Method
+L +L 500 m (1.25 mm 2 or more)
=
2 6 7
2
+L and L = 200 m (1.25 mm or more)
6 7
2
)
2 shielded wire. The length of this section (L
+L 500 m (1.25 mm 2 or more)
=
6 7
+L and L 200 m (1.25 mm 2 or more)
=
2 6 7
200 m (0.3 to 1.25 mm 2 )
=
4
Breaker for
Wiring (NFB)
25 A
15 A
E Sub Remote Controller
) should be included in the calculation of the
8
Breaker for Current Leakage
25 A 30 mA 0.1sec. or less
15 A 30 mA 0.1sec. or less
13