Mitsubishi Electric City Multi PUHY-HP144TSHMU-A, Service Handbook

Page: 42 / 265

[
II
Restrictions ]
33 - 33 - HWE0716A GB
(4) Wiring method
1) Indoor/outdoor transmission line
Same as [5] 1.
Only use shielded cables.
Shielded cable connection
Same as [5] 1.
2) Transmission line for centralized control
Daisy-chain terminals A and B on the system controller,
terminals M1 and M2 on the terminal block for transmis-
sion line for centralized control (TB7) on the outdoor
units (OC) in different refrigerant circuits and on the out-
door units (OC and OS) (Note) 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.
If a system controller is connected, set the central control
switch (SW2-1) on the control board of all outdoor units
to "ON."
The outdoor units in the same refrigerant circuit are au-
tomatically designated as OC and OS in the order of ca-
pacity from large to small (if two or more units have the
same capacity, in the order of address from small to
large).
Œ
Only use shielded cables.
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC and OS) with the shield wire of the
shielded cable. Short-circuit the earth terminal (
) and
the S terminal on the terminal block (TB7) on the outdoor
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 unit (IC) to the appropriate terminals
on the terminal block for indoor-outdoor transmission 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 or the LM adapter 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 and OS.
Proce-
dures
Unit or controller
Address
setting
range
Setting method Notes
Factory
setting
1 Indoor unit Main unit IC 01 to 50 Assign the smallest ad-
dress to the main unit in
the group. To perform a group oper-
ation of indoor units that
have different functions,
designate the indoor unit
in the group with the
greatest number of func-
tions as the main unit. 00
Sub unit Assign sequential num-
bers starting with the ad-
dress of the main unit in
the same group +1. (Main
unit a1, main unit
a2, main unit ad-
dress +3, etc.)
2 LOSSNAY LC 01 to 50 Assign an arbitrary but
unique address to each of
these units after assign-
ing an address to all in-
door units. None of these addresses
may overlap any of the in-
door unit addresses. 00
3 MA
remote con-
troller Main
remote
control-
ler MA No
settings re-
quired. - Enter the same indoor
unit group settings on the
system controller as the
ones that were entered
on the MA remote con-
troller. Main
Sub
remote
control-
ler MA Sub
remote con-
troller Settings to be made ac-
cording to the remote
controller function selec-
tion
4 Outdoor unit OC
OS 51 to 100 Assign sequential ad-
dress to the outdoor units
in the same refrigerant
circuit.
The outdoor units are au-
tomatically designated as
OC and OS.(Note) To set the address to
100, set the rotary switch-
es to 50. 00