Mitsubishi Electric PUHY-P200 Service Handbook page 46

[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).
HWE14040
Address setting
range
IC 01 to 50
LC 01 to 50
MA No
settings required.
MA Sub
remote controller
OC 51 to 100
OS1
OS2
- 37 - 37
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
Assign the smallest ad- To perform a group
dress to the main unit in operation of indoor
the group. units that have differ-
ent functions, desig-
Assign sequential num-
nate the indoor unit in
bers starting with the ad-
the group with the
dress of the main unit in
greatest number of
the same group +1. (Main
functions as the main
unit address +1, main unit
unit.
address +2, main unit ad-
dress +3, etc.)
Assign an arbitrary but None of these ad-
unique address to each of dresses may overlap
these units after assigning any of the indoor unit
an address to all indoor addresses.
units.
-
Settings to be made ac-
cording to the remote con-
troller function selection
Assign sequential address To set the address to
to the outdoor units in the 100, set the rotary
same refrigerant circuit. switches to 50.
The outdoor units are au-
tomatically designated as
OC, OS1, and OS2.
(Note)
)
Factory
Notes
setting
00
00
Main
00
GB