Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 249

SiUS331604E
CHECK 13
Broken wire check for the connecting wires
1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires:
2. Procedure for checking indoor-outdoor unit transmission wiring for broken wires (for checking
Service Diagnosis
On the system shown below, turn OFF the power supply to all equipment, short circuit between
the outdoor-outdoor unit terminal F1 and F2 in "Outdoor Unit A" farthest from the centralized
remote controller, and then conduct continuity checks between the transmission wiring terminal
blocks F1 and F2 of the centralized remote controller using a multiple meter. If there is
continuity between the said terminal blocks, the outdoor-outdoor unit transmission wiring has no
broken wires in it.
If there is no continuity, the transmission wiring may have broken wires. With the outdoor-
outdoor unit terminal of "Outdoor Unit A" short circuited, conduct continuity checks between the
transmission wiring terminal blocks F1 and F2 of the unified ON/OFF controller. If there is no
continuity, conduct continuity checks between the outdoor-outdoor unit terminal of "Outdoor
Unit E", between the outdoor-outdoor unit terminal of "Outdoor Unit D", between the outdoor-
outdoor unit terminal of "Outdoor Unit C", etc. in the order described, thus identifying the areas
with continuity.
If the areas with continuity can be identified, there may be broken wires in places before those
areas.
the indoor-outdoor unit transmission wiring of "Outdoor Unit C" for broken wires)
Turn OFF the power supply to all equipment, short circuit between the indoor-outdoor unit
terminal F1 and F2 in "Outdoor Unit C", and then conduct continuity checks between the
transmission wiring F1 and F2 of "Indoor Unit a" farthest from "Outdoor Unit C" using a multiple
meter. If there is continuity between the transmission wiring, the indoor-outdoor unit
transmission wiring has no broken wires in it.
If there is no continuity, the transmission wiring may have broken wires. With the indoor-outdoor
unit terminal of "Outdoor Unit C" short circuited, identify the areas with continuity in the
transmission wiring of "Indoor Unit b", transmission wiring of "Indoor Unit c", and transmission
wiring of "Indoor Unit d" in the order described.
If the areas with continuity can be identified, there may be broken wires in places before those
areas.
Check the transmission
wiring for continuity.
If there is continuity, the
indoor-outdoor unit
transmission has no
broken wires in it.
Short circuit between
the indoor-outdoor unit
terminal parts.
Indoor-outdoor Unit
Transmission Wiring
Unified ON/OFF controller
Troubleshooting by Error Code
Short circuit
between the
outdoor-outdoor
unit terminal
parts.
Outdoor-outdoor Unit
Transmission Wiring
Check the transmission
wiring for continuity.
If there is continuity, the
outdoor-outdoor unit
transmission has no broken
wires in it.
Centralized remote controller
236