Mitsubishi Electric PUHY-(E)P300, Service Handbook, Page: 46 / 302

[
II
Restrictions ]
37 - 37 -
HWE07010 GB
(4) Wiring method
1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 on the terminal block
for indoor-outdoor transmission line (TB3) on the outdoor
units (OC, OS1, OS2) (Note 1), terminals M1 and M2 on
the terminal block for indoor-outdoor transmission line
(TB5) on each indoor unit (IC), and the S terminal on the
system controller. (Non-polarized two-wire)
Œ
Only use shielded cables.
The outdoor units in the same refrigerant circuit are au-
tomatically designated as OC, OS1, and OS2 in the or-
der of capacity from large to small (if two or more units
have the same capacity, in the order of address from
small to large).
Shielded cable connection
Daisy-chain the ground terminal ( ) on the outdoor
units (OC, OS1, OS2), the S terminal on the terminal
block (TB5) on the indoor unit (IC), and the S terminal on
the system controller with the shield wire of the shielded
cable.
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block
for transmission line for centralized control (TB7) on the
outdoor units (OC) in different refrigerant circuits and on
the OC, OS1, and OS2 in the same refrigerant circuit.
If a power supply unit is not connected to the transmis-
sion line for centralized control, replace the power jump-
er connector on the control board from CN41 to CN40 on
only one of the outdoor units.
Set the central control switch (SW2-1) on the control
board of all outdoor units to "ON."
Œ
Only use shielded cables.
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC, OS1, OS2) with the shield wire of
the shielded cable. Short-circuit the earth terminal (
)
and the S terminal on the terminal block (TB7) on the out-
door unit whose power jumper connector is mated with
CN40.
3) MA remote controller wiring
Same as [5] 1.
When 2 remote controllers are connected to the sys-
tem
Same as [5] 1.
Group operation of indoor units
Same as [5] 1.
4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block
(TB5) on the indoor units (IC) to the appropriate termi-
nals on the terminal block for indoor-outdoor transmis-
sion line (TB5) on LOSSNAY (LC). (Non-polarized 2-
core cable)
Œ
Indoor units must be interlocked with the LOSSNAY unit
using the system controller. (Refer to the operation man-
ual for the system controller for the setting method.) In-
terlock setting from the remote controller is required if the
ON/OFF remote controller alone is connected.
5) Switch setting
Address setting is required as follows.
(5) Address setting method
The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.
Proce-
dures
Unit or controller
Address set-
ting range
Setting method Notes
Factory
setting
1 Indoor
unit Main unit IC 01 to 50 Assign the smallest address
to the main unit in the group. To perform a group opera-
tion of indoor units that have
different functions, desig-
nate the indoor unit in the
group with the greatest
number of functions as the
main unit. 00
Sub unit Assign sequential numbers
starting with the address of
the main unit in the same
group +1. (Main unit address
+1, main unit a2,
main unit a3, etc.)
2 LOSSNAY LC 01 to 50 Assign an arbitrary but
unique address to each of
these units after assigning an
address to all indoor units. None of these addresses
may overlap any of the in-
door unit addresses. 00
3 MA
remote
control-
ler Main
remote
controller MA No
settings re-
quired. - Enter the same indoor unit
group settings on the sys-
tem controller as the ones
that were entered on the MA
remote controller. Main
Sub
remote
controller MA Sub
remote con-
troller Settings to be made accord-
ing to the remote controller
function selection
4 Outdoor unit OC
OS1
OS2 51 to 100 Assign sequential address to
the outdoor units in the same
refrigerant circuit.
The outdoor units are auto-
matically designated as OC,
OS1, and OS2. (Note) To set the address to 100,
set it to 50. 00