Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 55

[ II Restrictions ]
(4) Wiring method
1) Indoor-heat source transmission line
Daisy-chain terminals M1 and M2 of the terminal block for indoor-
heat source transmission line (TB3) on the heat source units (OC
and OS), of the terminal block for indoor-heat source transmission
line (TB02) on the main and sub BC controllers (BC and BS), of the
terminal block for indoor-heat source transmission line (TB5) on
each indoor unit (IC), and the S terminal of the system control-
ler.(Non-polarized two-wire)
ŒOnly use shielded cables.
The heat source units in the same refrigerant circuit are automatical-
ly 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).
Shielded cable connection
Daisy-chain the ground terminal (
and OS), the S terminal of the terminal block (TB02) on the BC and
BS, and the S terminal of the terminal block (TB5) on the indoor unit
(IC) with the shield of the shielded cable.
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block for transmis-
sion line for centralized control (TB7) on the heat source units (OC)
in different refrigerant circuits and on the OC and OS in the same re-
frigerant 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 heat source units.
Set the central control switch (SW2-1) on the control board of all
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA Main
remote con-
remote
troller
controller
Sub
remote con-
troller
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
) on the heat source units (OC
Ad-
dress
setting
range
ŒAssign the smallest address to the main unit
IC 01 to
in the group.
50
ŒIn a system with a sub BC controller, make
the settings for the indoor units in the fol-
lowing 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 Assign an arbitrary but unique address to
each of these units after assigning an address
50
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 circuit.
OS
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
- 46 -
heat source units to "ON."
ŒOnly use shielded cables.
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 (
minal block (TB7) on the heat source unit whose power jumper con-
nector 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] 6.
4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block (TB5) on the in-
door units (IC) to the appropriate terminals on the terminal block for
indoor-heat source transmission line (TB5) on LOSSNAY (LC).
(Non-polarized two-wire)
ŒIndoor units must be interlocked with the LOSSNAY unit using the
system controller. (Refer to the operation manual for the system
controller for the setting method.) Interlock setting from the remote
controller is required if the ON/OFF remote controller alone is con-
nected.
5) Switch setting
Address setting is required as follows.
Setting method
ŒPort number setting is
ŒTo perform a group op-
None of these addresses may
overlap any of the indoor unit
addresses.
- Make the same indoor unit
group settings with the system
controller as the ones that
were made with the MA remote
controller.
ŒTo set the address to 100,
ŒIf the addresses that is as-
ŒThe use of a sub BC control-
) and the S terminal on the ter-
Fac-
tory
Notes
set-
ting
00
required
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
Main
00
set the rotary switches to 50.
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.
ler requires the connection
of a main BC controller.
GB