Samsung AM072BXV Series Service Manual page 318

Test Operation
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
5) Ball valve (service valve)
∙ What to inspect: Status of the outdoor unit's ball valve (service valve)
∙ Error code: E503 ("NG" is indicated in the result report)
∙ How to determine error: Check the variations of the operation frequency and pressure on the compressors during
operation.
∙ Perform inspection according to the steps shown below.
on the outdoor unit opened?
amount of additional refrigerant been injected
into the indoor unit and liquid
Perform Trial Operation (cooling/heating)
- See the instructions on Key operation modes.
Main EEV and pressure sensors operating
Is the operation cycle normal?
Perform Auto Trial Operation again.
■ Precautions
- If an error occurs, Auto Trial Operation stops immediately.
- When inspecting the ball valve, inspect the liquid line, gas line, and high pressure line (HR only) together.
- Symptoms in the event of an issue on the 4-way valve
A. Abnormal noise during compressor operation
B. Increase in the suction temperature
C. See the troubleshooting instructions on NG items related to the 4-way valve
- Symptoms in the event of an issue on the Main EEV
A. It is not possible to control the superheat (SH)
B. It is not possible to secure a DSH of higher than 20K
C. See the troubleshooting instructions on NG items related to the Main EEV
- If any abnormality occurs on the pressure sensor, see the troubleshooting instructions on NG items related to the pressure sensor
- If there frost has formed on the outdoor heat exchanger, perform Trial Operation or forced defrost operation to eliminate the frost, and
then perform Auto Trial Operation again.
- 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
Is the ball valve
Yes
Has the correct
line?
Are the 4-way valve,
properly?
No
Take corrective measures.
No
Take corrective measures.
No
Take corrective measures.
No
Take corrective measures.
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