Chaeck Items Before Test Operation; Main Check Items For Electric Wiring - Toshiba SMMS-e Quick Reference

Address Setup
30
Chaeck 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 that of R22 or R407 refrigerant "Modular Multi System" air conditioners.
Check wiring points again carefully.
(1) In the case that a central control system is not connected:
(1) Are the indoor and outdoor communication lines of the header 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)
(3) Is the communication line between outdoor units connected to the U5/U6 terminal?
(4) Is the terminator (SW30-bit 2) on the interface PC board of the header unit turned on? (Set up at
shipment from the factory)
(5) Is the terminator of the shield wire open?
(6) Is the terminator of the shield wire earthed at the header unit side?
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) (2) (4)
Header unit (A)
U3 U4
Outdoor unit
U1 U2 U5
(6)
U1 U2
Indoor unit
A B
Remote
controller
M a n i c h
<Clearing Indoor Unit address>
(3)
Follower unit (B)
U3 U4
U6 U1 U2 U5 U6
U1 U2 U1 U2 U1
A B A B
Remote Remote
controller controller
e c k i e t m s
Follower unit (C)
U3 U4
U1 U2 U5 U6
(5)
U2
A B
C h e c k