Toshiba MMY-MUP0721HT9P-UL Service Manual page 99

(2) In the case that a central control system is connected (before address setup)
U1 U2
Central Remote Controller
U3 U4
U3 U4
Uh
Other
Refrigerant Outdoor Unit
line
Uv Uc
U1 U2 U5 U6
To Indoor Unit
Indoor Unit
(1) Are the indoor and outdoor communication lines of the header unit connected to the U1/U2 (Uv) terminals?
(2) Is the communication line between outdoor units connected to the U5/U6 (Uc) terminal?
(3) Is the communication line of the central control system connected to the header unit U3/U4 (Uh) 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 header unit setting (SW101-bit 1) turned on?
Is the terminator resistor (SW100-bit 2 (termination resistance of Uv line)) on the interface PC board of the
header unit turned on?
* Does the smallest header unit of a system address turn on SW100-bit 1 (termination resistance of Uh line)?
Does the header unit of other refrigerant systems turn off SW100-bit 1?
(See "7-4-3. Address Setup Procedure" )
(5) Is the end terminal of the shield wire earthed?
(6) Is the end terminal of the shield wire earthed at the header 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 header 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.
(3) (4)
(1) Header Unit (A) Follower Unit (B)
U3 U4
Uh
Uv Uc Uv
U1 U2 U5 U6 U1 U2
(6)
U1 U2 U1 U2
Uv Uv
A B A B
Remote Remote
Controller
Controller
Main check items
(2)
Follower Unit (C)
U3 U4 U3 U4
Uh Uh
Uc Uv Uc
U5 U6 U1 U2 U5 U6
U1 U2 U1 U2
Uv Uv
A B A B
Remote
Controller
- 99 -
To other refrigerant line
(5)
Check