Check Items Before Test Operation (Before Powering-On) - Toshiba MCY-MHP0305HT-C Service Manual

8-2. 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 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:
Outdoor unit
(1) Are the indoor and outdoor communication lines of the outdoor unit connected to the U1 / U2
terminals?
(2) Relay connector CN10 which is mounted on the interface P.C. board or has been removed from
the CN02? (Set up factory default)
(3) Is the terminal resistance (SW30-bit 2) on the interface P.C. board of the outdoor unit turned on? (Set
up factory default)
(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.
If connect a relay connector CN10 to CN02, will connected communication line [U1, U2] and [U3, U4].
If [U1, U2] is connected to the [U3, U4], refrigerant line address can not be set correctly.
(1) (2)
U3 U4
SW13 SW14
CN10
CN02
SW30
U1 U2
(3)
(4)
Indoor unit
Remote
controller
M a n i c h e c k i e t m s
40
63
Remote Remote
controller controller
C h e c k