Mitsubishi Electric PURY-P120Y(T)HMU-A, Service Handbook

Page: 40 / 387

[
II
Restrictions ]
31 - 31 - HWE0803A 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
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.
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).
ΠOnly 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
shielded cable. Short-circuit the earth terminal (
) 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.
(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 ΠAssign the smallest address to the main
unit in the group.
ΠIn 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 ΠAssign sequential address to the outdoor
units in the same refrigerant circuit.
ΠThe outdoor units are automatically des-
ignated as OC and OS.(Note)
ΠTo set the address to 100,
set the rotary switches to 50.
ΠIf 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