Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 46

[ II Restrictions ]
(4) Wiring method
1) Indoor-heat source transmission line
Same as [5] 1.
Only use shielded cables.
Shielded cable connection
Same as [5] 1.
2) Transmission line for centralized control
Daisy-chain terminals A and B on the system controller, ter-
minals 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 heat source units
(OC, OS1, and OS2) in the same refrigerant circuit.
If a power supply unit is not connected to the transmission
line for centralized control, replace the power jumper con-
nector on the control board from CN41 to CN40 on only one
of the heat source units.
If a system controller is connected, set the central control
switch (SW5-1) on the control board of all heat source units
to "ON."
a) The heat source units in the same refrigerant circuit are au-
tomatically designated as OC, OS1, and OS2 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).
b) If TB7's on the heat source units in the same refrigerant cir-
cuit are not daisy-chained, connect the transmission line for
the central control system to TB7 of the OC. (Note a).To
maintain the central control even during an OC failure or a
power failure, connect TB7 on OC and OS together. (If there
is a problem with the heat source unit whose power jumper
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor unit
2 LOSSNAY
3 MA
remote con-
troller
4 Heat source unit
The heat source units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.
The heat source units are designated as OC, OS1, and OS2 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).
HWE15060
Address
setting
range
Main unit IC 01 to 50
Sub unit
LC 01 to 50
Main MA No
remote
settings re-
control-
quired.
ler
Sub MA Sub
remote
remote con-
control-
troller
ler
OC 51 to 100
OS1
OS2
was moved from CN41 to CN40, central control is not pos-
sible, even if TB7's are daisychained.)
Only use shielded cables.
Shielded cable connection
Daisy-chain the S terminal on the terminal block (TB7) on
the heat source units (OC, OS1, OS2) with the shield
wire 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] 1.
When 2 remote controllers are connected to the sys-
tem
Same as [5] 1.
Group operation of indoor units
Same as [5] 1.
4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block (TB5)
on the indoor unit (IC) to the appropriate terminals on the
terminal block for indoor-heat source transmission line
(TB5) on LOSSNAY (LC). (Non-polarized 2-core cable)
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.
Setting method
Assign the smallest ad-
dress to the main unit in
the group.
Assign sequential num-
bers starting with the ad-
dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad-
dress +3, etc.)
Assign an arbitrary but
unique address to each of
these units after assign-
ing an address to all in-
door units.
-
Settings to be made ac-
cording to the remote
controller function selec-
tion
Assign sequential ad-
dress to the heat source
units in the same refriger-
ant circuit.
The heat source units are
automatically designated
as OC, OS1, and
OS2.(Note)
- 37 - 37
Notes
To perform a group oper-
ation of indoor units that
have different functions,
designate the indoor unit
in the group with the
greatest number of func-
tions as the main unit.
None of these addresses
may overlap any of the in-
door unit addresses.
Enter the same indoor
unit group settings on the
system controller as the
ones that were entered
on the MA remote con-
troller.
To set the address to
100, set the rotary switch-
es to 50.
Factory
setting
00
00
Main
00
GB