Toshiba Super MMU-AP0091H Service Manual page 89

2. In case that a central control system is connected (Before address setup)
Central control units
U1 U2
U3 U4
Other refrigerant line
U3 U4
U1 U2 U5 U6
To indoor unit
No.
 Are indoor and outdoor communication lines of the header unit connected to U1/U2
terminals?
‚ Is the relay connector between U1/U2 terminal and U3/U4 terminal removed?
(Set up at shipment from the factory) (Before address setup, remove the relay connector.)
ƒ
Is the communication line between outdoor and indoor units connected to U5/U6 terminal?
Is the communication line of the central control system connected to the header unit U3/U4
„ terminals of each refrigerant line?
(The communication line of the central control system may be connected to the communi-
cation lines of the indoor/outdoor communication lines.)
Is the terminal resistance (SW30-2) on the interface P .C. board of the header unit turned on?
…
(Set up at shipment from the factory)
(After address setup, turn off SW30-2 of the header unit except the smallest unit after
check of trial operation.)
†
Is the end terminal of the shield cable grounded?
When the refrigerant line and the central control system of the custom air conditioner are
connected:
‡
→ Are TCC-LINK adaptors correctly connected?
→ When the digital inverter air conditioner operates with group operation, twin, or triple
operation, are the adopters connected to the header unit of the indoor unit?
NOTE) The above figure does not show all the electric cables.
For details, refer to the installation manuals for outdoor unit, indoor unit, remote controller, or optional
devices.
Header unit (A)
U3
Outdoor unit
U1 U2
1
Earth
3-phase
380-415V
Leak interception
Main switch
U1 U2
Indoor unit
A B
1-phase 230V
Leak interception
Main switch
Remote
controller
Main check items
89
4
2 5
Follower unit (B)
U4 U3 U4
U5 U6 U1 U2 U5 U6
6
U1 U2 U1 U2
A B A B
Remote Remote
controller controller
Other refrigerant line
3
Follower unit (C)
U3 U4
U1 U2 U5 U6
6
U1 U2
A B
Check