Broken Wire Check Of The Relay Wires - Daikin VRV RXYQ72-384XAYCA Service Manual

SiUS342004EB

4.10 Broken Wire Check of the Relay Wires

CHECK 15
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
Part 6 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 the outdoor unit A that is farthest from the central
remote controller, and then conduct continuity checks between the transmission wiring terminal
blocks F1 and F2 of the central remote controller using a multimeter. 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 the 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 as well, conduct continuity checks between the outdoor-outdoor unit
terminal of the outdoor unit E, between the outdoor-outdoor unit terminal of the outdoor unit D,
between the outdoor-outdoor unit terminal of the outdoor unit C, ... in the order described, thus
identifying the place with continuity.
If the place with continuity can be identified, there may be broken wires in places before the said
place with continuity.
the indoor-outdoor unit transmission wiring of the 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 the outdoor unit C, and then conduct continuity checks between the
transmission wirings F1 and F2 of the indoor unit a that is farthest from the outdoor unit C using
a multimeter. If there is continuity between the said transmission wirings, 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 the outdoor unit C short circuited, identify the place with continuity in the
transmission wiring of the indoor unit b, transmission wiring of the indoor unit c, and
transmission wiring of the indoor unit d in the order described.
If the place with continuity can be identified, there may be broken wires in places before the said
place with continuity.
Check
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