Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 51

[ II Restrictions ]
(4) Wiring method
1) Indoor-heat source transmission line
Same as [5] 7.
Shielded cable connection
Same as [5] 7.
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
heat source 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 heat source units.
The heat source units in the same refrigerant circuit are
automatically 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).
ŒOnly use shielded cables.
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA Main
remote remote
controller controller
Sub
remote
controller
4 Heat source unit
5 Auxiliary BCcon-
troller (Sub)
heat
source
unit
BC control-
ler (Main)
The heat source 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).
HWE09080
Address
setting Setting method
range
ŒAssign the smallest address to the main
IC 01 to 50
unit in the group.
ŒIn 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.
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 ad-
dress to all indoor units.
MA No set-
tings re-
quired.
MA Sub Settings to be made with the Sub/
remote Main switch
controller
ŒAssign sequential address to the heat
OC 51 to 100
source units in the same refrigerant cir-
OS
cuit.
ŒThe heat source 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 OC (or OS if it exists) +1
- 42 -
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the heat source units (OC, OS) with the shield wire of the
shielded cable. Short-circuit the earth terminal (
the S terminal on the terminal block (TB7) on the heat
source unit whose power jumper connector is mated with
CN40.
3) MA remote controller wiring
Same as [5] 6.
When 2 remote controllers are connected to the sys-
tem
Same as [5] 6.
Group operation of indoor units
Same as [5] 7.
4) LOSSNAY connection
Same as [5] 7.
5) Switch setting
Address setting is required as follows.
ŒPort number setting is
required
ŒTo 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
overlap any of the indoor unit
addresses.
-
ŒTo set the address to 100,
set the rotary switches to 50.
ŒIf the addresses that is as-
signed to the main BC con-
troller overlaps any of the
addresses that are assigned
to the heat source units or to
the sub BC controller, use a
different, unused address
within the setting range.
ŒThe use of a sub BC control-
ler requires the connection
of a main BC controller.
) and
Fac-
tory
Notes
set-
ting
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00
Main
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GB