Daikin SkyAir RZQ200 · 250C7Y1B Service Manual page 88

SiBE26-701
Items Key points
Power Inverter To replace the PC board assembly with
supply PC service parts, follow the procedure shown
section and board below.
PC board [Procedure]
replacement 1. Disconnect all connectors and
2. Unfasten the screws that fix the plastic
3. Dismount the Inverter PC board
4. Mount a new inverter PC board
5. Connect the connectors and terminals.
Control When replacing to a spare control PC
PC board, install a capacity setting adapter to
board meet the capacity. The capacity is written
in E
control PC board.
Electric discharge of During the compressor stops operating,
capacitor controls the electric discharge of
capacitor. In this case, a noise may be
heard, while it is not an abnormal status.
Residual electric Before conducting maintenance of the
charge of capacitor switch box, turn off the power switch, and
make sure that the voltage between the
capacitor terminals is 50 VDC or less. If it
is not possible to check the voltage, wait
for 10 minutes or more before servicing.
Not possible to improve On standard models, it was possible to
power factor by increase the power factor by installing a
installation of phase- capacitor. On inverter models, installation
advance capacitor of a capacitor can damage the IGBT. Be
sure not to install a capacitor on inverter
models.
Selection of leakage Select a leakage breaker (high-
breaker harmonics/high-frequency non-operating
type) designed for inverters. If the
leakage breaker is not designed for
inverters, high frequency can result in a
malfunction.
Does not result in malfunction stop, and
Fin temperature
the unit will automatically reset after
increase
standby for 3 minutes. The fin
temperature increase can be checked by
service mode or LED on the PC board.
* Capacity setting is made with DIP switches on the PC board. For more information, refer to
Troubleshooting
terminals connected to the PC board.
PC board box.
assembly from the sheet metal part.
assembly to the sheet metal part.
2
PROM at factory but not in the spare
"Maintenance and Repair Manual".
Items Key points
Instantaneo- Insufficient voltage and instantaneous
us power power failure resulted in an operation
failure shutdown due to "U2" error (supply
detection voltage abnormality).
Fan residual The fan operates for about 30 seconds to
operation cool the inverter after the compressor
stops operating. If the fin temperature is
high, the fan will keep operating until the
fin temperature lowers.
Fan motor Before replacing the fan motor, make
replacement sure that the fan is not operating and
disconnect the fan motor connector from
the PC board. If the fan is operating, the
fan motor generates power to supply
voltage to the PC board circuit. Further,
make sure that the voltage between the
capacitor terminals of the main circuit is
50 V or less before replacing the fan
motor. To prevent the PC board from
damage, touch the grounding terminal of
the switch box by hands without fail to
relieve static electricity from yourself right
before detaching the connector.
DC fan If the contrary winds blow hard, the
motor contrary winds are automatically detected
to stop the fan and conduct heat
exchange utilizing the natural wind. In this
case, the fan motor may not output
voltage, while such an operating status is
not abnormal.
Pump down The LPS cannot be activated by closing
operation the stop valve while in cooling operation.
Be sure to use the "Pump Down Switch"
to collect the refrigerant. Because
refrigerant gas remains in the field piping,
be sure to collect residual gas using a
refrigerant recovery unit.
Pay Top panel sealing materials have a
attention to function to prevent water from entering
damaged from the fan chamber to the mechanical
sealing chamber (electrical components) and
materials on dew condensation water on the top panel
the top from dropping on the switch box.
panel Therefore, if delamination and breakage
of sealing materials occurs during
servicing, replace them.
Maintenance Inspections
77