Emergency Operation - Daikin VRV - WII Service Manual

SiUS30-604
3.2.9 Power Transistor Check Operation
When the inverter system malfunctions (malfunction of inverter, INV compressor), to locate where
the malfunction occurs, switching to the power transistor check mode of inverter in the service
mode setting enables not to judge the position detection signal malfunction but to output waveform
only during inverter operation. (The waveform can be checked by disconnecting the wiring of
compressor.)
After the completion of checks, return the system to the previous mode and wait for 30 seconds or
more until the discharge of capacitor is completed. Then, conduct a subsequent work.
Notes: Be sure to disconnect the compressor wiring when conducting the check operation mentioned
above.
When the output voltage is approx. 100~200 V (10 Hz) and the voltage balance between phases
U-V, V-W, W-U is within ±5%, the inverter PCB is normal.
Refer the detail power transistor check to page 281.

3.2.10 Emergency Operation

If the compressor cannot operate, this control inhibits any applicable compressor or outside unit
from operating to perform emergency operation only with the operative compressor or outside unit.
Caution
For making a compressor unable to operate due to malfunction, etc., be sure to conduct
the work with emergency operation setting.
Never execute work such as disconnection of the power cable from magnet contactor.
(Otherwise, other normal compressors may malfunction.)
∗ Because the units will be operated in the combination with which oil pressure
equalization between compressors cannot be performed.
3.2.11 Restrictions for Emergency Operation
• If the emergency operation is set while the outside unit is in operation, the outside unit stops once
3.2.12 In the Case of Multi-Outside-Unit System
Test Operation
after pump-down residual operation (a maximum of 5 minutes elapsed).
Automatic backup operation
With multi-outside-unit system, if a certain outside unit system malfunctions (i.e., the system
stops and indoor unit remote controller displays the malfunction), by resetting the system with the
indoor unit remote controller, the applicable outdoor unit is inhibited from operating for 8 hours,
thus making it possible to perform emergency operation automatically.
However, in the event any of the following malfunctions occurs, automatic backup operation can
be performed.
Malfunctions under which automatic backup operation can be performed:
• E3, E4, E5, E7
• F3
• H7, H9
• J2, J3, J5, J6, J7, J9, JA, JC
• L3, L4, L5, L8, L9, LC
• U2, UJ
Field Setting
135