Samsung MXJ-YA1509 Series Installation Manual page 45

Problem analysis Problem analysis
Regular vacuum pump was used in vac Regular vacuum pump was used in vacuum operation.
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Consequence Consequence
If the power of the vacuum pump cuts off unexpectedly If the power of the vacuum pump cuts off unexpectedly
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then the oil gets back to the r then the oil gets back to the refrigerant system due to
pressure difference.
pressure difference.
Standard procedure Standard procedure
Use the vacuum pump which is 100% dedicated for Use the vacuum pump which is
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R410a system with stop valve.
R410a system with stop valve.
Proper method Proper method
Purchase and use the vacuum pump with Purchase and use the vacuum pump with the stop valve.
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Installation guide Installation guide
uum operation.
efrigerant system due to
100% dedicated for
the stop valve.