Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

Page: 55 / 436

[2-7 Example System with an MA Remote Controller ]
BS_02_E 18
- chapter 2
2
Rest
rict
io
ns
(4) Wiring method
1) Indoor/outdoor transmission line
Same as 2-7-1
Shielded cable connection
Same as 2-7-1
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.
If a system controller is connected, set the central control
switch (SW5-1) on the control board of all outdoor units
to "ON."
a) When connecting TB7, only commence after checking
that the voltage is below 20 VDC.

Only use shielded cables.
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC) with the shield wire of the shielded
cable. Daisy-chain the S-terminal of the system control-
ler and the S-terminals on TB7 (terminal block for cen-
tralized control transmission lines) of the outdoor units
(OC) in different refrigerant circuits. 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 2-7-1
When 2 remote controllers are connected to the sys-
tem
Same as 2-7-1
Group operation of indoor units
Same as 2-7-1
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)

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
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 address
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 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
controller 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 controller. Main
Sub
remote
control-
ler MA Sub
remote con-
troller Settings to be made accord-
ing to the remote controller
function selection
4 Outdoor unit OC 51 to 99 Assign the smallest address
to the outdoor unit (OC) in
the same refrigerant circuit. To set the address to 100,
set the rotary switches to
50.
If the address assigned to
the hydro unit overlaps
any of the addresses as-
signed to the outdoor
units, use a different, un-
used address in the spec-
ified setting range. 00
5 Auxiliary
outdoor
unit Hydro
unit HU 52 to 100 Assign an address that
equals the "address of the
outdoor unit in the same re-
frigerant circuit plus 1" to the
unit. 00
0000004972.BOOK 18 ページ ２０１９年５月８日 水曜日 午後２時４８分