Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 54

[ II Restrictions ]
(4) Wiring method
1) Indoor-heat source transmission line
Same as [5] 7.
Shielded cable connection
Same as [5] 7.
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 and OS 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.
a) The heat source units in the same refrigerant circuit are au-
tomatically designated as OC and OS in the order of capac-
ity 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
(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-
heat troller
source (Sub)
unit
BC control-
ler (Main)
HBC con-
troller
Sub-HBC
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).
HWE15060
Address
setting
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 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.
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/Main
remote switch
controller
OC 51 to 100 Assign sequential address to the heat
source units in the same refrigerant circuit.
OS
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
HB 51 to 100 Assign an address that equals the lowest
address of the indoor units to be connected
HS
to the HBC controller or Sub-HBC plus 50.
- 45 - 45
power failure, connect TB7 on OC and OS together. (If there
is a problem with the heat source unit whose power jumper
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, OS) with the shield wire of the
shielded cable. Short-circuit the earth terminal (
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 sys-
tem
Same as [5] 6.
Group operation of indoor units
Same as [5] 7.
4) LOSSNAY connection
Same as [5] 7.
5) Switch setting
Address setting is required as follows.
Setting method
None of these addresses may
overlap any of the indoor unit
addresses.
-
Notes
Port number setting is re-
quired
To perform a group opera-
tion of indoor units that
feature different functions,
designate the indoor unit
in the group with the great-
est number of functions as
the main unit.
To set the address to 100, set
the rotary switches to 50.
If the addresses that is as-
signed to the main BC control-
ler 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 controller
requires the connection of a
main BC controller.
If the address that is as-
signed to the HBC controller
and Sub-HBC overlaps any
of the addresses that are as-
signed to the other units,
use a different, unused ad-
dress within the setting
range.
) and
Facto-
ry set-
ting
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Main
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