Installation manual

[ II Restrictions ]
39- 39 -
HWE10050 GB
(4) Wiring method
1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 of the terminal block for indoor-
outdoor transmission line (TB3) on the outdoor units (OC and OS)
(Note a), of the terminal block for indoor-outdoor transmission line
(TB02) on the main and sub BC controllers (BC and BS), and of the
terminal block for indoor-outdoor transmission line (TB5) on each in-
door unit (IC). (Non-polarized two-wire)
Only use shielded cables.
a) The outdoor units in the same refrigerant circuit are auto-
matically designated as OC and OS in the order of ca-
pacity 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 ( ) on the outdoor units (OC and
OS), the S terminal of the terminal block (TB02) on the BC and BS,
and the S terminal of the terminal block (TB5) on the indoor unit (IC)
with the shield of the shielded cable.
2) Transmission line for centralized control
Daisy-chain terminals A and B of the system controller, M1 and M2
terminals of TB7 (terminal block for centralized control system con-
nection) on the outdoor units (OC) in different refrigerant systems,
and M1 and M2 terminals of TB7 (terminal block for centralized con-
trol system connection) on the outdoor units (OC and OS (Note)) in
the same refrigerant circuit.
When both of the following conditions are met, move the power
jumper connector on the control board from CN41 to CN40 on only
one of the outdoor units: (1) No power supply units are connected to
the transmission line for centralized control AND (2) No controllers
with a power-supply function are connected to the system.
When connecting a system controller, set the centralized control
switch (SW2-1) on the control board of all indoor units to "ON."
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 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 outdoor unit whose
power jumper was moved from CN41 to CN40, central control is not
possible, even if TB7's are daisy-chained.)
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 shielded cable. Short-
circuit the earth terminal ( ) and the S terminal on the terminal
block (TB7) on the outdoor 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 system
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 in-
door unit (IC) to the appropriate terminals on the terminal block for
indoor-outdoor transmission line (TB5) on LOSSNAY (LC). (Non-po-
larized two-wire)
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.