Mitsubishi Electric PURY-P120, Service Handbook

Page: 42 / 411

[
II
Restrictions ]
33 - 33 - HWE09130 GB
(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 out-
door units (OC) in different refrigerant circuits and on the OC
and OS (Note a) in the same refrigerant circuit.
If a power supply unit is not connected to the transmission
line for centralized control, replace the power jumper con-
nector 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 automat-
ically designated as OC and OS 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) If TB7's on the outdoor units in the same refrigerant circuit
are not daisy-chained, connect the transmission line for the
central control system to TB7 of the OC. (Note a).To main-
tain the central control even during an OC failure or a power
failure, connect TB7 on OC and OS together. (If there is a
problem with the outdoor unit whose power jumper was
moved from CN41 to CN40, central control is not possible,
even if TB7's are daisy-chained.)
Œ
Only use shielded cables.
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 shield-
ed cable. Short-circuit the earth terminal (
) and the S ter-
minal 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 system
Same as [5] 1.
Group operation of indoor units
Same as [5] 1.
4) LOSSNAY connection
Same as [5] 2.
5) Switch setting
Address setting is required as follows.
(5) Address setting method
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).
Proce-
dures
Unit or controller
Address
setting
range
Setting method Notes
Fac-
tory
set-
ting
1 Indoor
unit Main unit IC 01 to 50
Œ
Assign the smallest address to the main
unit in the group.
Œ
In a system with a sub BC controller,
make the settings for the indoor units in
the following order.
(i) Indoor unit to be connected to the main
BC controller
(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.
Œ
Port number setting is
required
Œ
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.
00
Sub unit Assign sequential numbers starting with
the address of the main unit in the same
group +1. (Main unit a1, main unit
a2, main unit a3, etc.)
2 LOSSNAY LC 01 to 50 Assign an arbitrary but unique address to
each of these units after assigning an ad-
dress to all indoor units. None of these addresses may
overlap any of the indoor unit
addresses. 00
3 MA
remote
controller Main
remote
controller MA No set-
tings re-
quired. - Main
Sub
remote
controller MA Sub
remote
controller Settings to be made with the Sub/
Main switch
4 Outdoor unit OC
OS 51 to 100
Œ
Assign sequential address to the outdoor
units in the same refrigerant circuit.
Œ
The outdoor units are automatically des-
ignated as OC and OS.(Note)
Œ
To set the address to 100,
set the rotary switches to 50.
Œ
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.
Œ
The use of a sub BC control-
ler requires the connection
of a main BC controller.
00
5 Auxiliary
outdoor
unit BCcon-
troller (Sub) 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 control-
ler (Main) BC OC (or OS if it exists) +1