Toshiba MCY-MUG0401HSW-E Service Manual page 78

In the case that a central control system is connected (before address setup)
Central remote controller
Uh
Other
refrigerant line
SW101 SW102
SW100
Uv
(1) Are the indoor and outdoor communication lines connected to the Uv terminals?
(2*) Is the communication line between Shut-off Valve unit and indoor unit connected to A, B terminals?
(3*) Is the communication line between Leak Detector and indoor unit connected to A, B terminals?
(4) Is the communication line of the central control system connected to the outdoor unit Uh terminals
of each refrigerant line?
(Connecting to other than Uh terminals cause troubles.)
(5) Is the termination resistor (SW100-bit 2) on the interface P.C. board of the outdoor unit turned on?
* Does the smallest header unit of a system address turn on SW100-bit 1
(termination resistor of Uh line)?
Does the outdoor unit of other refrigerant systems turn off SW100-bit 1?
(See "7-4-3. Address Setup Procedure" )
(6) Is the end terminal of the shield wire earthed at the outdoor unit side?
* Check item (2) or (3) only when the safety device (Shut-off Valve unit, Leak detector) is connected.
NOTE
The figure above does not show all the electric wires.
For details, refer to the installation manuals for the outdoor unit, indoor unit, remote controller, or optional devices.
(4)
Uh
Outdoor unit
To indoor unit
(2) (3)
Shut-off
Valve unit
Main check items
(1)
SW101 SW102
SW100
Uv
(5)
Uv
Indoor unit
A B
Leak Remote
Detector controller
77
To other refrigerant line
Uh
(1)
Uv Uv
A B A B
Remote
Remote
controller controller
Check
Uv
A B