Haier 1U71S2SS5FA - Leak Test and Vacuum Drying

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If the temperature is higher than 30and the humidity
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materials should be at least 20mm in ouder to avoid
condensation on the surface of the sealing.
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NOTICE
Any exposed piping may cause condensation.
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piping can reach is around 120°C, so be sure to
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DANGER
No not touch piping and internal parts.
7.7. Cautions for necessity of a trap
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liquid compression phenomenon, or cases of deterioration
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difference in height of 10m in the riser gas piping.
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installed at higher position than the indoor unit.
8. Leak test and vacuum
drying
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connected to the indoor unit, it is necessary to :
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check for any leakages in the refrigerant piping
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to perform vacuum drying to remove all moisture in
the refrigerant piping.
If there is a possibility of moisture being present in the
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8.1. General guidelines
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All piping inside the unit has been factory tested for
leaks.
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Connect the vacuum pump to both the service port
of the gas stop valve and the liquid stop valve to
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NOTICE
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vacuum pump to evacuate the installation.
No additional refrigerant is provided for air
purging.
Make sure that the gas stop valve and
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performing the leak test or vacuum drying.
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1. Vacuum leak test
1.1 Evacuate the system from the liquid and gas
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1.2 Once reached, turn off the vacuum pump and
check that the pressure does not rise for at least
1 minute.
1.3 Should the pressure rise, the system may
either contain moisture (refer to the paragraph "
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2. Pressure leak test
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gas to a minimum gauge pressure of 0.2 MPa (2
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the maximum operation pressure of the unit, i.e.
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2.2 Test for leaks by applying a bubble test solution
to all piping connections.
NOTICE
Make sure to use a recommended bubble test
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1. Evacuate the system for at least 2 hours to a target
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target vacuum is maintained for at least 1 hour.
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hours or maintain the vacuum for 1 hour, the system
may contain too much moisture.
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and repeat steps 1 to 3 unit all moisture has been
removed.
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additional refrigerant can be charged.