Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 41

[ II Restrictions ]
(4) Wiring method
1) Indoor-heat source transmission line
Same as [5] 1.
ŒOnly use shielded cables.
Shielded cable connection
Same as [5] 1.
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, OS1, and OS2 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, 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).
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA Main
re- remote
mote controller
con-
Sub
troller
remote
controller
4 Heat source unit
The heat source units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.
HWE09080
Address setting
range
IC 01 to 50 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.)
LC 01 to 50 Assign an arbitrary but
unique address to each of
these units after assigning
an address to all indoor
units.
MA No
settings required.
MA Sub Settings to be made ac-
remote controller cording to the remote con-
troller function selection
OC 51 to 100 Assign sequential address
OS1 to the heat source units in
OS2 the same refrigerant cir-
cuit. The heat source
units are automatically
designated as OC, OS1,
and OS2. (Note)
- 32 -
ŒOnly 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] 2.
4) LOSSNAY connection
Same as [5] 2.
5) Switch setting
Address setting is required as follows.
Setting method
To perform a group
operation of indoor
units that have differ-
ent functions, desig-
nate the indoor unit in
the group with the
greatest number of
functions as the main
unit.
None of these ad-
dresses may overlap
any of the indoor unit
addresses.
-
To set the address to
100, set the rotary
switches to 50.
Factory
Notes
setting
00
00
Main
00
GB