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

Page: 53 / 436

[2-7 Example System with an MA Remote Controller ]
BS_02_E 16
- chapter 2
2
Rest
rict
io
ns
(4) Wiring method
1) Indoor/outdoor transmission line
Same as 2-7-1

Only use shielded cables.
Shielded cable connection
Same as 2-7-1
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block
for transmission line for centralized control (TB7) on the
outdoor units (OC) in different refrigerant circuits.
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. Short-circuit the earth terminal (
) and the S ter-
minal 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
Same as 2-7-2
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 ad-
dress to the main unit in
the group. To perform a group
operation of indoor
units that have differ-
ent functions, desig-
nate the indoor unit in
the group with the
greatest number of
functions 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 assigning
an address to all indoor
units. None of these ad-
dresses may overlap
any of the indoor unit
addresses. 00
3 MA
remote
control-
ler Main
remote
controller MA No
settings required. - Main
Sub
remote
controller MA Sub
remote controller Settings to be made ac-
cording to the remote con-
troller function selection
4 Outdoor unit OC 51 to 99 Assign the smallest ad-
dress to the outdoor unit
(OC) in the same refriger-
ant circuit. To set the address to
100, set the rotary
switches to 50.
If the address as-
signed to the hydro
unit overlaps any of
the addresses as-
signed to the outdoor
units, use a different,
unused address in the
specified 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
refrigerant circuit plus 1" to
the unit. 00
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