Mitsubishi Electric PURY-P72 Service Handbook page 46

[ II Restrictions ]
(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 units (OC and OS),
of the terminal block for indoor-outdoor transmission line (TB02) on
the main and sub BC controllers (BC and BS), and of the terminal
block for indoor-outdoor transmission line (TB5) on each indoor unit
(IC). (Non-polarized two-wire)
Shielded cable connection
Daisy-chain the ground terminal (
OS), the S terminal of the terminal block (TB02) on the BC (BS), and
the S terminal of the terminal block (TB5) on the indoor unit (IC) with
the shield of the shielded cable.
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).
Only use shielded cables.
2) Transmission line for centralized control
Daisy-chain terminals A and B on the terminal block for transmission
line for centralized control (TB7) on the outdoor units (OC) in differ-
ent refrigerant circuits and on the OC and OS in the same refrigerant
circuit.
If a power supply unit is not connected to the transmission line for
centralized control, replace the power jumper connector on the con-
trol board from CN41 to CN40 on only one of the outdoor units.
Set the central control switch (SW2-1) on the control board of all out-
(5) Address setting method
Pro
ce-
Unit or controller
du-
res
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA
Main remote
controller
remote
controller
Sub remote
controller
4 Outdoor unit
5 Auxiliary BC
controller
outdoor
(Sub)
unit
BC control-
ler (Main)
The outdoor units in the same refrigerant circuit are automatically designated as OC and OS.
They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same).
HWE0803A
) on the outdoor units (OC and
Address
setting
range
IC 01 to 50 Assign the smallest address to the main unit in the
group.
In a system with a sub BC controller, make the set-
tings for the indoor units in the following order.
(i) Indoor unit to be connected to the main BC con-
troller
(ii) Indoor unit to be connected to sub BC controller 1
(iii) Indoor unit to be connected to sub BC controller 2
Make the settings for the indoor units in the way
that the formula "(i) < (ii) < (iii)" is true.
Assign sequential numbers starting with the address
of the main unit in the same group +1. (Main unit ad-
dress +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
required.
MA Sub re- Settings to be made with the Sub/Main switch
mote con-
troller
OC 51 to 100 The sum of the smallest address of the indoor units
in the same system and 50.
OS
Assign sequential address to the outdoor units in
the same refrigerant circuit.
The outdoor units are automatically designated as
OC and OS.(Note)
BS 51 to 100 Assign an address that equals the sum of the smallest
address of the indoor units that are connected to the
sub BC controller and 50.
BC 51 to 100 OC (or OS if it exists) +1
- 37 - 37
door units to "ON."
Only use shielded cables.
Shielded cable connection
Daisy-chain the S terminal of the terminal block (TB7) on the system
controller, OC, and OS with the shield of the shielded cable. Short-
circuit the earth terminal (
block (TB7) on the outdoor unit whose power jumper connector is
mated with CN40.
3) MA remote controller wiring
Same as [5] 1.
When 2 remote controllers are connected to the system
Same as [5] 1.
Group operation of indoor units
Same as [5] 1.
4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block (TB5) on the in-
door unit (IC) to the appropriate terminals on the terminal block for
indoor-outdoor transmission line (TB5) on LOSSNAY (LC). (Non-po-
larized two-wire)
Indoor units must be interlocked with the LOSSNAY unit us-
ing the system controller. (Refer to the operation manual for
the system controller for the setting method.) Interlock set-
ting from the remote controller is required if the ON/OFF re-
mote controller alone or the LM adapter alone is connected.
5) Switch setting
Address setting is required as follows.
Setting method
-
) and the S terminal on the terminal
Fact
ory
Notes
set-
ting
Port number setting is 00
required
To perform a group op-
eration of indoor units
that feature different
functions, designate
the indoor unit in the
group with the greatest
number of functions as
the main unit.
None of these addresses may 00
overlap any of the indoor unit
addresses.
Mai
Make the same indoor unit
group settings with the system
n
controller as the ones that
were made with the MA remote
controller.
To set the address to 100, 00
set the rotary switches to 50.
To set the address to 100, 00
set the rotary switches to 50.
If the addresses that is as-
signed to the main BC con-
troller overlaps any of the
addresses that are assigned
to the outdoor units or to the
sub BC controller, use a dif-
ferent, unused address with-
in the setting range.
The use of a sub BC control-
ler requires the connection
of a main BC controller.
GB