Check Items Before Test Operation (Before Powering-On) - Toshiba MMY-MUP0721FT6P-UL Service Manual

7-2. Check Items before Test Operation (before powering-on)

Prior to the test operation, check the following items to verify there are no problems with the installation work.
Main check items for electric wiring
The communication system differs from previous period model air conditioners.
Check wiring points again carefully.
(1) In the case that a central control system is not connected:
(1)
Header Unit (A)
U3 U4
Uh
Outdoor Unit
Uv
U1 U2
(4)
U1 U2
Uv
Indoor Unit
A B
Remote
Controller
(1) Are the indoor and outdoor communication lines of the header unit connected to the U1/U2 (Uv) terminals?
(2) 2) Is the communication line between outdoor units connected to the U5/U6 (Uc) terminal?
(3) 3) Is the header unit setting (SW101-bit 1) turned on?
Is the terminator resistor (SW100-bit 2) on the interface PC board of the header unit turned on?
(4) 4) Is the end terminal of the shield wire earthed?
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)
Follower Unit (B)
U3 U4
Uh
Uc Uv Uc
U5 U6 U1 U2 U5 U6
U1 U2 U1 U2
Uv Uv
A B A
Remote Remote
Controller Controller
Main check items
(2)
Follower Unit (C)
U3 U4
Uh
Uv Uc
U1 U2 U5 U6
(4)
U1 U2
Uv
B A B
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