Check
SiSG121917E
173
Part 6 Service Diagnosis
8.6 Inverter Unit Refrigerant System Check
Check No.14
8.7 Inverter Analyzer Check
Check No.15
Characteristics
Inverter analyzer: RSUK0917C
If an abnormal stop occurs due to compressor startup failure or overcurrent output when using
an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or
some other failure (main PCB, power module, etc.). The inverter analyzer makes it possible to
judge the cause of trouble easily and securely. (Connect an inverter analyzer as a
quasi-compressor instead of compressor and check the output of the inverter.)
Operation Method
Step 1
Be sure to turn the power off.
Step 2
Install an inverter analyzer instead of a compressor.
Note:
Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC
or below before carrying out the service work.
Close
Cooling:
The problem unit does not cool
the room.
Only the problem unit is in
operation, the unit starts pump
down.
(The low pressure of the unit
becomes vacuum.)
Abnormal discharge pipe
temperature
Reset power supply and conduct cooling operation unit
by unit.
Valve
opening
position
Possible problem
Check method
Check the lo
w
press
u
re.
(R16020)
YES
N
O
Replace the EV
of the room.
The EV is not
defecti
v
e.
Does the press
u
re
b
ecome into
v
ac
uu
m
zone?
Refrigerant system check
Is the discharge pipe
thermistor disconnected from
the holder?
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
(R1
88
70)
YES
N
O
Reconnect the thermistor.
Replace the refrigerant.
