Samsung AM072BXV Series Service Manual page 323

Test Operation
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
10) Electronic Expansion Valve – Main (Main EEV)
∙ What to inspect: Outdoor unit's Main EEV operation .
(applicable only when performing Auto Trial Operation in heating mode)
∙ Error code: None ("NG" is only indicated in the result report)
∙ How to determine error: Check the variations of the pressure and the compressor's discharge temperature during
operation of the Main EEV.
∙ Perform inspection according to the steps shown below.
Does the result
of Auto Trial Operation show that the
indoor unit's thermistors are properly
functioning?
Are the connectors
of the discharge thermistor and Compressor
Top thermistors properly connected
to the PBA?
Is the Main EEV
connector properly connected
to the PBA?
Is the coil
of the Main EEV properly
functioning?*
Is the output
signal of the Main EEV terminal on the Hub
PBA normal?*
Replace the Main EEV*.
Perform Auto Trial Operation again.
■ Precautions
- To replace a component or inspect the PBA, be sure to cut off the power supply first.
If inspection must be performed with the power supply on, exercise extra care to prevent electric shock.
Samsung Electronics
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Take corrective measures.
Take corrective measures.
Take corrective measures.
Replace the coil.
* Resistance value of the Main EEV coil (reference temp: 20℃ )
Connection diagram
White
Red
Orange
Yellow
Brown
Blue
Replace the Hub PBA.
* It is possible to inspect the output signal, using a separate EVI EEV and
the vacuum mode.
* Replace it if the NG is still found after an additional Auto Trial Operation.
Operation voltage Phase-to-phase
(VDC) resistance (Ω)
Red - White
Red - Orange
12±2.0 Brown - Yellow
Brown - Blue
150 ± 15
317