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

Page: 49 / 436

[2-7 Example System with an MA Remote Controller ]
BS_02_E 12
- chapter 2
2
Rest
rict
io
ns
(4) Wiring method
1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 of the terminal block
for indoor-outdoor transmission line (TB3) on the outdoor
unit (OC), of the terminal block for indoor-outdoor trans-
mission line (TB3) on the Hydro unit (HU), and of the ter-
minal block for indoor-outdoor transmission line (TB5) on
each indoor unit (IC). (Non-polarized two-wire)

Only use shielded cables.
Shielded cable connection
Daisy-chain the ground terminal ( ) on the outdoor unit
(OC), the S terminal of the terminal block (TB3) on the
Hydro unit (HU), and the S terminal of the terminal block
(TB5) on the indoor unit (IC) with the shield of the shield-
ed cable.
2) Transmission line for centralized control
No connection is required.
3) MA remote controller wiring
Connect terminals 1 and 2 on the terminal block for MA
remote controller line (TB15) on the indoor unit (IC) to the
terminal block on the MA remote controller (MA). (Non-
polarized two-wire)
When 2 remote controllers are connected to the sys-
tem
When 2 remote controllers are connected to the system,
connect terminals 1 and 2 of the terminal block (TB15) on
the indoor unit (IC) to the terminal block on the two MA
remote controllers.

Set one of the MA remote controllers to sub. (Refer to
MA remote controller function selection or the installation
manual for the MA remote controller for the setting meth-
od.)
Group operation of indoor units
To perform a group operation of indoor units (IC), daisy-
chain terminals 1 and 2 on the terminal block (TB15) on
all indoor units (IC) in the same group, and then connect
terminals 1 and 2 on the terminal block (TB15) on the in-
door unit on one end to the terminal block on the MA re-
mote controller. (Non-polarized two-wire)

When performing a group operation of indoor units that
have different functions, "Automatic indoor/outdoor ad-
dress setup" is not available.
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 (TB5) on LOSSNAY (LC). (Non-po-
larized two-wire)

Interlock operation setting with all the indoor units in the
same system will automatically be made. (It is required
that the Lossnay unit be turned on before the outdoor
unit.)

For information about certain types of systems (1. Sys-
tems in which the LOSSNAY unit is interlocked with only
part of the indoor units, 2. Systems in which the LOSS-
NAY unit is operated independently from the indoor
units, 3. Systems in which more than 16 indoor units are
interlocked with the LOSSNAY unit, and 4. Systems to
which two ore more LOSSNAY units are connected), re-
fer to the following page(s). [2-7-2 Single Refrigerant
System with Two or More LOSSNAY Units]
5) Switch setting
No address settings required.
6) When replacing the control board on only some of the
outdoor units, delete all connection information. (Refer to
[5-1-1 Outdoor Unit Switch Functions and Factory Set-
tings] for information on switch functions.)
(5) Address setting method
Proce-
dures
Unit or controller
Address setting
range
Setting method Notes
Factory
setting
1 Indoor unit Main unit IC No settings re-
quired. - For information about how
to perform a group opera-
tion of indoor units that
feature different functions,
refer to the following
page(s). [2-7-2 Single Re-
frigerant System with Two
or More LOSSNAY Units] 00
Sub unit IC
2 LOSSNAY LC No settings re-
quired. - 00
3 MA
remote con-
troller Main
remote
controller MA No settings re-
quired. - Main
Sub
remote
controller MA Sub
remote controller Settings to be
made according
to the remote
controller func-
tion selection
4 Outdoor unit OC No settings re-
quired. - 00
5 Auxiliary
outdoor unit Hydro unit HU No settings re-
quired. - 00
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