Mitsubishi Electric R410A Service Handbook page 44

[2-7 Example System with an MA Remote Controller ]
(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 and on
the OC, OS1, and OS2 (Note a) 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.
a) The outdoor units in the same refrigerant circuit are auto-
matically designated as OC, OS1, and OS2 in the order
of capacity from large to small (if two or more units have
the same capacity, in the order of address from small to
large).
b) When not daisy-chaining TB7's on the outdoor units in
the same refrigerant circuit, connect the transmission
line for centralized control to TB7 on the OC (Note a). To
maintain centralized control even during an OC failure or
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA Main
re- remote
mote controller
con-
Sub
troller
remote
controller
4 Outdoor unit
The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.
The outdoor units are designated as OC, OS1, and OS2 in the order of capacity from large to small (if two or more units have
the same capacity, in the order of address from small to large).
HWE14080
Address setting
range
IC 01 to 50 Assign the smallest ad-
dress to the main unit in
the group.
Assign sequential num-
bers starting with the ad-
dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad-
dress +3, etc.)
LC 01 to 50 Assign an arbitrary but
unique address to each of
these units after assigning
an address to all indoor
units.
MA No
settings required.
MA Sub Settings to be made ac-
remote controller cording to the remote con-
troller function selection
OC 51 to 100 Assign sequential address
OS1 to the outdoor units in the
OS2 same refrigerant circuit.
The outdoor units are au-
tomatically designated as
OC, OS1, and OS2.
(Note)
- 35 - 35
a power failure, daisy-chain TB7 of OC, OS1, and OS2.
(If there is a problem with the outdoor unit whose power
jumper was moved from CN41 to CN40, centralized con-
trol is not possible, even if TB7's are daisy-chained).
c) 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, 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 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.
Setting method
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.
None of these ad-
dresses may overlap
any of the indoor unit
addresses.
-
To set the address to
100, set the rotary
switches to 50.
)
Factory
Notes
setting
00
00
Main
00
GB