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), and of
the terminal block for indoor-heat source transmission line (TB5) on
each indoor unit (IC). (Non-polarized two-wire)
Shielded cable connection
The heat source units in the same refrigerant circuit are auto-
matically designated as OC, OS1, and OS2 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).
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.
Œ
Only use shielded cables.
2) Transmission line for centralized control
Daisy-chain terminals A and B on the terminal block for transmission
line for centralized control (TB7) on the heat source units (OC) in dif-
ferent refrigerant circuits and on the OC and OS (Note) in the same
refrigerant 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 of the terminal block (TB7) on the system
controller, OC, and OS with the shield of the shielded cable. Short-
circuit the earth terminal (
) and 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 system
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 unit (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 us-
ing the system controller. (Refer to the operation manual for
the system controller for the setting method.) Interlock set-
ting from the remote controller is required if the ON/OFF re-
mote controller alone or the LM adapter alone is connected.
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).
Pro
ce-
du-
res
Unit or controller
Ad-
dress
setting
range
Setting method Notes
Fact
ory
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 set-
tings for the indoor units in the following order.
(i) Indoor unit to be connected to the main BC control-
ler
(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 re-
quired
Œ
To perform a group opera-
tion of indoor units that
feature different functions,
designate the indoor unit
in the group with the
greatest number of func-
tions 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 address
+1, 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 address to all indoor units. None of these addresses may
overlap any of the indoor unit ad-
dresses. 00
3 MA
remote
control-
ler Main re-
mote
controller 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. Mai
n
Sub re-
mote con-
troller MA Sub re-
mote
controller Settings to be made with the Sub/Main switch
4 Heat source unit OC
OS 51 to 100
Œ
The sum of the smallest address of the indoor units in
the same system and 50.
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.
00
5 Auxilia-
ry heat
source
unit BC
controller
(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.
Œ
To set the address to 100, set
the rotary switches to 50.
Œ
If the addresses that is assigned
to the main BC controller over-
laps any of the addresses that
are assigned to the heat source
units or to the sub BC control-
ler, use a different, unused ad-
dress within the setting range.
Œ
The use of a sub BC controller
requires the connection of a
main BC controller.
00
BC con-
troller
(Main) BC 51 to
100 OC (or OS if it exists) +1