Daikin RTSQ20PY1 Service Manual page 355

SiBE31-801_C
CHECK 7
Broken Wire Check of 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
Troubleshooting
On the system shown below, turn OFF the power supply to all equipment, short-circuit
between the outdoor-outdoor unit terminal parts F1 and F2 in the "Outdoor Unit A" that is
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 parts 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 parts of the "Outdoor Unit E", between the outdoor-outdoor unit terminal parts of the
"Outdoor Unit D", between the outdoor-outdoor unit terminal parts 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.
checking 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 parts 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 multiple meter. 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 parts 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.
(2) Check the transmission
wiring for continuity.
If there is continuity, the
indoor-outdoor unit
transmission has no
broken wires in it.
a
Troubleshooting (Heat Reclaim Ventilation)
(2) Short-circuit between
the indoor-outdoor unit
terminal parts.
Indoor-outdoor Unit
Transmission Wiring
b c d
Unified ON/OFF controller
A
(1) Short-circuit
between the
outdoor-outdoor
unit terminal
parts.
B
Outdoor-outdoor Unit
Transmission Wiring
C
D
E
(1) Check the transmission
wiring for continuity.
If there is continuity, the
outdoor-outdoor unit
transmission has no broken
wires in it.
Centralized remote controller
344