Daikin SkyAir Super Inverter 70 D Series, Руководство по обслуживанию

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SiE25-110 Procedure of Self-Diagnosis by LED
Troubleshooting 129
Items Key points Items Key points
Power supply
section and
PC board
replacement Inverter
PC board To replace the PC board assembly with
service parts, follow the procedure shown
below.
[Procedure]
Remove the 2 screws securing the power
module to the radiation fin.
While tilting the PC board resin spacer to
one side, remove the PC board.
Wipe grease from the radiation fin surface.
Apply new grease to the same area on the
radiation fin surface.
Install a new PC board.
Secure the PC board assembly in place
using the 2 screws.
For details, see Removal of Parts.
Selection of
installation
site Provide a space of 400 mm or more above the
outdoor unit for maintenance of the switch
box. Especially, make sure that an adequate
space is provided when stacking outdoor
units.
Instantaneous
power failure
detection In other inverter models, insufficient voltage
and instantaneous power failure resulted in an
operation shutdown due to “U2” error (supply
voltage abnormality). In new models, LED1+4
light in those cases without indicating an error
code, and the unit will automatically reset.
Fan residual
operation The fan operates for about 30 seconds to 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
replacement Before replacing the fan motor, make 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.
Control
PC board When replacing to a spare control PC board,
install a capacity setting adapter to meet the
capacity. The capacity is written in E
2
PROM at
factory but not in the spare control PC board.
DC fan motor If the contrary winds blow hard, the 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.
Electric discharge of
capacitor During the compressor stops operating,
controls the electric discharge of capacitor. In
this case, a noise may be heard, while it is not
an abnormal status. Reluctance
DC
compressor AC inverter compressors and constant speed
compressors are provided with 3 lead wires.
However, reluctance DC compressors are
provided with 4 lead wires. All of the 4 lead
wires must be connected to the respective
correct places. Therefore, pay attention to the
wire connection when replacing the
compressor, etc. Operation in mistaken wire
connection can result in trouble with
equipment.
Residual electric charge
of capacitor Before conducting maintenance of the 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. New type
scroll
compressor New type scroll compressors are different
from the previous scroll compressors in the
structure. The suction pipe is attached to the
top of the compressor, and the discharge pipe
to the side. Therefore, pay attention to the
piping positions when measuring temperature,
etc.
Pre-heating operation
(For P63 and 80 only) Even when the compressor is not operating,
open-phase voltage is supplied via the inverter
instead of the compressor’s crankcase heater
to prevent refrigerant from dissolving in oil.
The ON/OFF of this open-phase voltage is
automatically controlled according to the
discharge pipe temperature and outdoor
temperature. Therefore, be sure to turn the
power supply off before conducting
maintenance. PAM control Single-phase compressors are equipped with
PAM. Therefore, DC voltage during operation
increases up to 300 to 400 V, while this
operating status is not abnormal. Pay attention
to safety and measuring instruments, etc.
Not possible to improve
power factor by
installation of phase-
advance capacitor On standard models, it was possible to
increase the power factor by installing a
capacitor. On inverter models, installation of a
capacitor can damage the IGBT. Be sure not
to install a capacitor on inverter models. Startup
control ON/OFF switching of solenoid valve is
conducted several times to ensure the
reliability of compressor during compressor
startup. In this case, a noise may be heard,
while this operating status is not abnormal.
Selection of leakage
breaker Select a leakage breaker (high-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. Caution about
top panel
sealing
material
damage The shape and material of the top panel
sealing material are different from those of
standard models of Skyair series. The top
panel sealing material prevents water in the
fan compartment from entering the machine
compartment (electric components) and also
prevents water resulting dew condensation on
the top panel from entering the switch box.
When the top panel sealing material peels or
tears during servicing, replace the sealing
material.
Fin temperature increase Does not result in malfunction stop, and the
unit will automatically reset after standby for 3
minutes. The fin temperature increase can be
checked by service mode or LED on the PC
board. Pump down
operation Low pressure protection switch (LPS) is not
provided on products equipped with scroll
compressor. Therefore, in normal cooling
operation, LPS cannot be actuated by shutting
stop valve. Collect refrigerant without fail by
using the pump down operation switch.
PC board
Area of grease
application
for radiation
Radiation aluminum fin
Power module