Samsung AM080FXWANR Service Manual page 284

Test Operation
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
2) Outdoor unit's thermistors
∙ What to inspect: Outdoor unit's thermistors (temperatures of outdoor air (or water temp), Cond out, EVI entrance/exit,
Suction, and liquid line)
∙ Error code: None ("NG" is only indicated in the result report)
∙ How to determine error: Check the temperature difference between the thermistors on the outdoor units before
the compressors are started.
∙ Perform inspection according to the steps shown below.
Wait until the thermistors on the outdoor
units become stable.
Is the deviation
No
between the inspected thermistors
greater than 10
Are the thermistor
connectors properly connected
to the PBA?
Are the thermistors
attached to the correct
positions?
Are the resistance
values* for the thermistors
normal?
Replace the Hub PBA.
Perform Auto Trial Operation again.
Precautions
- Start inspection after the outdoor unit's thermistors become stable (generally, leave idle for at least one hour).
If you start inspection immediately after operation, the temperature is not stable and this can degrade the inspection accuracy.
- To replace a component or inspect the PBA, be sure to cut off the power supply first.A
If inspection must be performed with the power supply on, exercise extra care to prevent electric shock.
Samsung Electronics
?
Yes
Yes
No
No
Yes
No
Yes
Take corrective measures.
Take corrective measures.
Replace the thermistors.
* How to measure
Resistance Disconnect the thermistor
connectors from the PBA and then measure
the resistance between the terminals of the
connectors.
Temperature ( ) Resistance (KΩ)
70
60
50
40
30
20 12.1
10 18.0
0 27.3
-10 43.0
2.2
3.0
4.2
5.8
8.3
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