Mitsubishi Electric PQHY-P120THMU-A, Service Handbook

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[
II
Restrictions ]
GB HWE09080
(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)
Œ
Only 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 ( ) on the heat source units (OC
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
heat source units to "ON."
Œ
Only 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 (
) and the S terminal on the ter-
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)
Œ
Indoor 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.
(5) Address setting method
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).
Proce-
dures
Unit or controller
Ad-
dress
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 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.
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 address
+2, main unit a3, etc.)
2 LOSSNAY LC 01 to
50 Assign an arbitrary but unique address to
each of these units after assigning an address
to all indoor units. None of these addresses may
overlap any of the indoor unit
addresses. 00
3 MA
remote
controller
Main
remote con-
troller
MA
No set-
tings re-
quired.
-
Make the same indoor unit
group settings with the system
controller as the ones that
were made with the MA remote
controller.
Main
Sub
remote con-
troller MA Sub
remote
controller Settings to be made with the Sub/
Main switch
4 Heat source unit OC
OS
51 to 100
Œ
Assign sequential address to the heat
source units in the same refrigerant circuit.
Œ
The heat source units are automatically
designated 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 heat source units or to
the sub BC controller, use a
different, unused address
within the setting range.
Œ
The use of a sub BC control-
ler requires the connection
of a main BC controller.
00
5 Auxiliary
heat
source
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