Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 50

[ 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), and of the terminal
block for indoor-heat source transmission line (TB5) on
each indoor unit (IC). (Non-polarized two-wire)
Only use shielded cables.
a) The heat source units in the same refrigerant circuit are
automatically 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 (
units (OC and OS), the S terminal of the terminal block
(TB02) on BC and BS, and the S terminal of the terminal
block (TB5) on the indoor unit (IC) with the shield of the
shielded cable.
(5) Address setting method
Proce-
Unit or controller
dures
1 Indoor Main unit
unit
Sub unit
2 LOSSNAY
3 MA Main
remote remote
controller controller
Sub
remote
controller
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).
HWE15150
) on the heat source
Address
setting Setting method
range
IC 01 to 50
Assign the smallest address to the main
unit in the group.
In a system with a sub BC controller,
make the settings for the indoor units in
the following 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 50
Assign an arbitrary but unique address to
each of these units after assigning an ad-
dress to all indoor units.
MA No set-
tings re-
quired.
MA Sub Settings to be made with the Sub/
remote Main switch
controller
OC 51 to 100 Assign sequential address to the heat
source units in the same refrigerant cir-
OS
cuit.
The 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
- 41 - 41
2) Transmission line for centralized control
No connection is required.
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 indoor unit (IC) to the appropriate terminals
on the terminal block (TB5) on LOSSNAY (LC). (Non-po-
larized two-wire)
Interlock setting between the indoor units and LOSS-
NAY units must be entered on the remote controller. (Re-
fer to "IV [3] Interlock Settings via the MA Remote
Controller" or the installation manual for the MA remote
controller for the setting method.)
5) Switch setting
Address setting is required as follows.
Port number setting is
required
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.
None of these addresses may
overlap any of the indoor unit
addresses.
-
To set the address to 100,
set the rotary switches to 50.
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.
The use of a sub BC control-
ler requires the connection
of a main BC controller.
Fac-
tory
Notes
set-
ting
00
00
Main
00
GB