Mitsubishi Electric PURY-P72 Service Handbook page 41

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[II Restrictions]
(4) Wiring method
1) Indoor/outdoor transmission line
Same as [5] 2.
Shielded cable connection
Same as [5]2.
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 and OS 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.
Note
I
The outdoor units in the same refrigerant circuit are au-
tomatically designated as OC and OS in the order of ca-
pacity 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.
(5) Address setting method
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC, OS) with the shield wire of the
shielded cable. Short-circuit the earth terminal (
rh )
and
the S terminal on the 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 sys-
tem
Same as [5]1.
Group operation of indoor units
Same as [5]2.
4) LOSSNAY connection
Same as [5]2.
5) Switch setting
Address setting is reqUired as follows.
Address
Fac-
Proce-
Unit or controller setting
Setting method
Notes
tory
dures
set-
range
ting
1 Indoor Main unit IC 01 to 50
'Assign the smallest address to the main
·Port number setting is 00
unit
unit in the group.
required
'In a system with a sub BC controller,
make the settings for the indoor units in
-To perform a group op-
the following order.
eration of indoor units
(i)
Indoor unit to be connected to the main
that feature different
BC controller
functions, designate
(ii)
Indoor unit
to
be connected to sub BC
controller
1
the indoor unit in the
(iii)
Indoor unit to be connected to sub BC
group with the greatest
controller
2
number of functions as
Make the settings for the indoor units in
the main unit.
the way that the formula '(i)
<
(ii)
< (iii)"
is true.
Sub unit
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.)
2 LOSSNAY
LC 01 to 50
Assign an arbitrary but unique address to None of these addresses may
00
each of these units after assigning an ad- overtap any of the indoor unit
dress to all indoor units.
addresses.
3 MA Main MA No set-
-
Main
remote remote tings
re-
controller controller quired.
Sub MA Sub Settings to be made with the Sub/
remote
remote Main switch
controller controller
4 Outdoor unit OC 51 to 100
'Assign sequential address to the outdoor
'To set the address to
100, 00
OS
units in the same refrigerant circuit.
set the rotary switches
to 50.
'The outdoor units are automatically des- 'If the addresses that is as-
ignated as OC and OS.(Note) signed
to
the main BC con-
troller overlaps any of the
5
Auxiliary
BCcon·
BS 51 to 100
Assign an address that equals the sum of addresses that are assigned
outdoor
troller (Sub)
the smallest address of the indoor units to the outdoor units or to the
that are connected to the sub BC controller
sub BC controller, use a dif-
unit
and
SO.
ferent, unused address with-
in the setting range.
BCcontrol-
BC OC (or OS if it exists) +1
'The use of a sub BC control-
ler(Main)
ler requires the connection
of a main Be controller.
Note
I
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).
HWEOB03A
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GB