Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 41

[2-7 Example System with an MA Remote Controller ]
(4) Wiring method
1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor trans-
mission line terminal block (TB3) on the outdoor unit
(OC) and A1, B1 terminals of the indoor/outdoor terminal
block (TB5-1) on the indoor unit (IC). (Non-polarized 2-
core cable)
Only use shielded cables.
Shielded cable connection
Connect the earth terminal of the OC and S terminal of
the IC terminal block (TB5-1).
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block
for transmission line for centralized control (TB7) on
each outdoor unit (OC). Disconnect the male connector
(5) Address setting method
Procedures Unit or controller
1 Indoor
unit
2 Outdoor unit
3 MA
remote
controller
14
- chapter 2
Address
setting range
Main unit IC 01 to 50
Sub unit IC 01 to 50
OC 51 to 100
Main MA No settings
remote required.
controller
Sub MA Sub
remote remote
controller controller
on the controller board from the female power supply
switch connector (CN41), and connect it to the female
power supply switch connector (CN40) on only one of the
outdoor units.
Only use shielded cables.
Shielded cable connection
To ground the shielded cable, daisy-chain the S-termi-
nals on the terminal block (TB7) on each of the outdoor
units. Connect the S (shielded) terminal on the terminal
block (TB7) on the outdoor unit whose male connector
on CN41 was disconnected and connected to CN40 to
the earth terminal( ) on the electric box.
3) Switch setting
Address setting is required as follows.
Setting method
Assign a sequential odd number
starting with "01" to the upper in-
door controller.
Assign sequential numbers start-
ing with the address of the main
unit in the same group. (Main
unit address +1)
Add 50 to the address assigned
to the indoor unit connected to
the system with one outdoor unit.
-
Settings to be made with the sub/
main switch
Factory
Notes
setting
00
00
Main
BS_02_C