Inverter Unit Refrigerant System Check; Inverter Analyzer Check - Daikin MKS-T Series Service Manual

Check
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.
173
Valve
Possible problem
opening
position
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
Close
becomes vacuum.)
 Abnormal discharge pipe
temperature
Refrigerant system check
Is the discharge pipe
thermistor disconnected from
the holder?
NO
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
Reset power supply and conduct cooling operation unit
by unit.
Check the low pressure.
Does the pressure
become into vacuum
YES
SiSG121917E
Check method
NO
zone?
YES
Reconnect the thermistor.
Replace the refrigerant.
Part 6 Service Diagnosis
The EV is not
defective.
Replace the EV
of the room.
(R16020)
(R18870)