Mitsubishi Electric PUHY-HP72 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
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 and on the out-
door units (OC, OS1, and OS2) in the same refrigerant
circuit. (Note b)
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.
If a system controller is connected, set the central control
switch (SW5-1) on the control board of all outdoor units
to "ON."
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
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-
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor unit Main unit IC
Sub unit
2 LOSSNAY
3 MA Main
remote remote
controller control-
ler
Sub
remote
control-
ler
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).
HWE18240_GB
3) MA remote controller wiring
4) LOSSNAY connection
5) Switch setting
Address
Setting method
setting
range
01 to 50 Assign the smallest address
to the main unit in the group.
Assign sequential numbers
starting with the address of
the main unit in the same
group +1. (Main unit address
+1, main unit address +2,
main unit address +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 re-
quired.
MA Sub Settings to be made accord-
remote con- ing to the remote controller
troller function selection
OC 51 to 100 Assign sequential address to
OS1 the outdoor units in the same
OS2 refrigerant circuit.
The outdoor units are auto-
matically designated as OC,
OS1, and OS2. (Note)
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.
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
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.
Address setting is required as follows.
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.
None of these addresses
may overlap any of the in-
door unit addresses.
- Enter the same indoor
unit group settings on the
system controller as the
ones that were entered on
the MA remote controller.
To set the address to 100,
set the rotary switches to
50.
)
Factory
Notes
setting
00
00
Main
00
19
chapter 2 -