Inverter Unit Refrigerant System Check; Inverter Analyzer Check - Daikin FTKM-U Series Service Manual

SiMX042215E
5.5

Inverter Unit Refrigerant System Check

Check No.14
5.6

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.
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the
Part 6 Service Diagnosis
Refrigerant system check
Is the discharge pipe
thermistor disconnected from
the holder?
NO
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
(1) Remove the terminals from
the compressor.
compressor
YES
(2) Connect the terminals to the
terminals of the inverter analyzer.
compressor
Be careful not to let the terminals (U,V,W) touch
each other. Otherwise, high voltage is applied.
Check
Reconnect the thermistor.
Replace the refrigerant.
(R18870)
Inverter analyzer
(R22731)
93