Toshiba MMY-SAP0806HT8P-E Service Manual page 77

(2) In the case that a central control system is connected (before address setup)
Central remote controller
U1 U2
U3 U4
Other
refrigerant line
U3 U4
U1 U2
To indoor unit
(1) Are the indoor and outdoor communication lines of the outdoor unit connected to the U1/U2 terminals?
(2)Is the relay connector between the U1/U2 terminal and the U3/U4 terminal disconnect? (Set up at
shipment from the factory)
(Keep the relay connector disconnected before address setup.)
(3) Is the communication line of the central control system connected to the outdoor unit U3/U4 terminals
of each refrigerant line?
(The communication line of the central control system may be connected to the communication lines
of the indoor/outdoor communication lines.)
(4)Is the terminator resistor (SW30-bit 2) on the interface PC board of the outdoor unit turned on? (Set
up at shipment from the factory)
* After address setup and test operation check, turn on the SW30-bit 2 of the outdoor unit for the
smallest line address, and turn off SW30-bit 2 of the outdoor unit for other refrigerant lines.
(See "7-4-3. Address Setup Procedure")
(5) Is the end terminal of the shield wire open?
(6) Is the end terminal of the shield wire earthed at the outdoor unit side?
(7) When the refrigerant line and the central control system of the DI-SDI series are connected:
Are Network adapter (TCB-PCNT30TLE2) correctly connected?
When the DI-SDI series operates with group, twin, or triple operation, are the adapters
connected to the outdoor unit of the indoor unit?
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.
(1) (3)
U3 U4
Outdoor unit
U1 U2
U1 U2
Indoor unit
A B
Remote
controller
M a n i c h e c k i e t m s
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(4)
(2)
(6)
U1 U2 U1 U2
A B A B
Remote Remote
controller controller
To other refrigerant line
(5)
U1 U2
A B
C h e c k