120
4.9.2
During vacuum drying, a vacuum pump is used to lower the pressure in the piping to the extent that any moisture
present evaporates. At 5mmHg (755mmHg below typical atmospheric pressure) the boiling point of water is 0°C.
Therefore a vacuum pump capable of maintaining a pressure of -756mmHg or lower should be used. Using a vacuum
pump with a discharge in excess of 4L/s and a precision level of 0.02mmHg is recommended.
Before performing vacuum drying, make sure that all the outdoor unit stop valves are firmly closed.
Once the vacuum drying is complete and the vacuum pump is stopped, the low pressure in the piping could
suck vacuum pump lubricant into the air conditioning system. The same could happen if the vacuum pump
stops unexpectedly during the vacuum drying procedure. Mixing of pump lubricant with compressor oil could
cause compressor malfunction and a one-way valve should therefore be used to prevent vacuum pump
lubricant seeping into the piping system.
Step 2
Step 3
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Step
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Pressure gauge
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