Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
II
Restrictions ]
Wiring method/address setting method
1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor transmission 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)
ΠOnly 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 on the controller board from the female power supply switch con-
nector (CN41), and connect it to the female power supply switch connector (CN40) on only one of the outdoor units.
ΠOnly use shielded cables.
[Shielded cable connection]
To ground the shielded cable, daisy-chain the S-terminals 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.
Pro
ce-
du-
res
Unit or controller
Address-
settin-
grange
Setting method Notes
Facto-
ry set-
ting
1 Indoor
unit Main unit IC 01 to 50 Assign a sequential odd number
starting with "01" to the upper indoor
controller. 00
Sub unit IC 01 to 50 Assign sequential numbers starting
with the address of the main unit in
the same group. (Main unit address
+1)
2 Outdoor unit OC 51 to 100 Add 50 to the address assigned to
the indoor unit connected to the sys-
tem with one outdoor unit. 00
3 MA
remote
controller Main
remote
controller MA No set-
tings re-
quired. - Main
Sub
remote
controller MA Sub
remote
controller Settings to be made with the sub/
main switch