Test Operation
Samsung Electronics 291
9-1 Auto Trial Operation (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 on
ly 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.
Ŷ 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, exercis
e extra care to prevent electric shock.
Take corrective measures.
Take corrective measures.
Take corrective measures.
Replace the Hub PBA.
Does the result
of Auto Trial Operation sho
w that the
indoor unit's thermistors are properly
functioning?
Is the Main EEV
connector properly connected
to the PBA?
Are the connectors
of the discharge thermistor
and Compressor
Top thermistors properly connected
to the PBA?
Is the coil
of the Main EEV properly
functioning?*
Is the output
signal of the Main EEV term
inal on the Hub
PBA normal?*
Replace the Main EEV*.
Perform Auto Trial Operation again.
Replace the coil.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Connection diagram
Operation voltage
(VDC)
Phase-to-phase
resistance (Ω)
White
Red
Orange
Yellow
Brown
Blue
12±2.0
Red - White
Red - Orange
Brown - Yellow
Brown - Blue
150 ± 15
* 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 A
uto Trial Operation.
* Resistance value of the Main EEV coil (reference temp: 20ఁ )
9-1-3 How to resolve NG items (cont.)
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