Mitsubishi Electric PURY-HP144, Service Handbook

Page: 49 / 398

[2-7 Example System with an MA Remote Controller ]
HWE18220_GB 20
- chapter 2
2 Restrictions
(4) Wiring method
1) Indoor/outdoor transmission line
Same as 2-7-2
Only use shielded cables.
Shielded cable connection
Same as 2-7-2
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 outdoor units (OC) in dif-
ferent refrigerant circuits and on the outdoor units (OC and
OS) in the same refrigerant circuit. (Note b)
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 outdoor units.
If a system controller is connected, set the central control
switch (SW5-1) on the control board of all outdoor units to
"ON."
a) The outdoor units in the same refrigerant circuit are automat-
ically 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).
b) If TB7's on the outdoor units in the same refrigerant circuit
are not daisy-chained, connect the transmission line for the
central control system to TB7 of the OC. (Note a).To main-
tain 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 outdoor unit whose power jumper was
moved from CN41 to CN40, central control is not possible,
even if TB7's are daisy-chained.)
c) When connecting TB7, only commence after checking that
the voltage is below 20 VDC.
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 shield-
ed cable. Short-circuit the earth terminal (
) and the S ter-
minal on the terminal block (TB7) on the outdoor unit whose
power jumper connector is mated with CN40.
3) MA remote controller wiring
Same as 2-7-1
When 2 remote controllers are connected to the system
Same as 2-7-1
Group operation of indoor units
Same as 2-7-1
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-outdoor 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 outdoor 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).
Proce-
dures
Unit or controller
Ad-
dress
setting
range
Setting method Notes
Fac-
tory
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 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.
When using additional BC controllers (3 to
11 BC controllers), make the same set-
tings.
Œ
Port number setting is re-
quired
Œ
To perform a group opera-
tion of indoor units that fea-
ture different functions,
designate the indoor unit in
the group with the greatest
number of functions 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 a1, main unit address
+2, 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 over-
lap any of the indoor unit addresses. 00
3 MA
remote
controller Main
remote con-
troller 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. Main
Sub
remote con-
troller MA Sub
remote
controller Settings to be made with the Sub/
Main switch
4 Outdoor unit (Note) OC
OS 51 to 100
Œ
Assign sequential address to the outdoor
units in the same refrigerant circuit.
Œ
The outdoor units are automatically desig-
nated as OC and OS.(Note)
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 overlaps
any of the addresses that are as-
signed to the outdoor units or to
the sub BC controller, use a differ-
ent, unused address within the
setting range.
Œ
The use of a sub BC controller re-
quires the connection of a main
BC controller.
00
5 Auxiliary
outdoor
unit BC control-
ler (Main) BC 51 to 100 OC (or OS if it exists) +1
BC control-
ler (Sub) BS 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.