Hitachi FS3 Series, Руководство по обслуживанию

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1
TROUBLESHOOTING
7
1.1.4 EMERGENCY OPERATION WHEN INVERTER COMPRESSOR IS DAMAGED
n
Failure of Inverter Compressor
a. Contents of Operation (Applied Models: RAS-8FS3(G),
10FS3(G), 16FS3(G), 20FS3(G))
1. This operation is an emergency operation by a
constant compressor, when the inverter compressor is
failed.
2. By turning ON ”#1” of DSW7 on PCB1 and ”#1” of
DSW1 on PCB3, emergency operation is started.
3. Control of the emergency operation is same with
normal control except the inverter compressor
stoppage.
b. Operating Condition
The constant speed compressor is forced to be stopped
for compressor protection under the condition below:
Total Capacity of Thermo-ON indoor units
< 50% of Outdoor Unit Capacity
In case of the above condition, the compressor is
operated and stopped repeatedly, and it may cause the
compressor failure. Therefore, the compressor is forced
to be stopped to protect it.
Note: If the printed circuit board for inverter (PCB3) is
damaged, this is not available.
c. Method of Emergency Operation
Checking Before Emergency Operation.
1. Measure insulation resistance of the inverter
compressor.
Do not perform the emergency operation when the
insulation resistance is 0
W
.
There is a possibility that refrigerant oil may be
oxidized, if the emergency operation is performed, the
other compressor is damaged.
2. In case of total capacity of Thermo-ON indoor units
are more than 50% of outdoor unit capacity,
emergency operation is available.
3. In this emergency operation, frequency of the
compressor is not controlled at each 1Hz.
Therefore, alarm code ”07”, ”43”, ”44”, ”45” or ”47”
may be indicated on LCD. Details of alarm codes are
shown in the alarm code table (page 1-18).
4. This emergency operation does not provide sufficient
cooling and heating capacity.
5. This method is an emergency operation temporarily
when the inverter compressor is damaged. Therefore,
change the new one as soon as possible.
6. Turn OFF ”#1” of DSW7 on PCB1 and ”#1” of DSW1
on PCB3 after changing the new compressor. If this
setting is not performed, the inverter compressor will
be damaged.
d. Emergency Operation
1. Turn OFF all the power source switches.
2. Disconnect the wiring from the inverter compressor.
Insulate the faston terminals for invertercompressor
wires by insulation tape.
3. Set the No.1 of DSW7 on the PCB1 and No.1 of
DSW1 on the PCB3 at the ”ON” side.
4. Turn ON all the power source switches.
5. Operate the system by remote control switches.
6. The system is stopped by turning OFF all the remote
control switches or turning OFF all the power source
switches.
n
Failure of Constant Speed Compressor
a. Contents of Operation (Applied Models: RAS-8FS3(G),
10FS3(G), 16FS3(G), 20FS3(G))
1. This operation is an emergency operation by the
inverter compressor, when the constant speed
compressor is failed.
2. This operation is controlled by a normal control.
b. Operating Condition
1. Set the No.2 of DSW7 on the PCB1 at the ”ON” side.
2. Temperature of THM2, THM3 and THM4 on the top of
compressors are not ignored by setting DSW7.
If the thermistor is short-circuited or cut, this operation
is available.