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Idiomas disponibles
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18
Procedure – Triple Evacuation
Pull a vacuum to 1500 microns. If the vacuum fails to hold, determine the cause and correct.
Begin again and pull a vacuum to 1500 microns.
Break the vacuum with refrigerant vapor to a pressure of about 2 psig. Do not exceed the micron
gauge transducer's maximum pressure surge to the transducer of the micron gauge.
Pull a second vacuum to 1500 microns.
Break the vacuum with refrigerant vapor to a pressure of about 2 psig. Prior to charging the
system, packing from all filter / drier shells should be removed if a sealed filter or drier is not
provided. Proper suction filters and liquid drier cores should be installed when applicable.
Pull a third vacuum to 500 microns. Close vacuum header valves and allow system to stand for
a minimum of 12 hours. If the 500 micron vacuum holds, charging may begin. If not, the cause
must be determined and corrected. Repeat the entire evacuation procedure from the first step.
Pre-charge Check List
During any of the pull downs, check:
Merchandisers
Electrical requirements and power supply
Electrical connections tight and clean
Proper fan operation
Thermostat setting
Walk-in Coolers and Freezers
Electrical requirements and power supply
Electrical connections tight and clean
Proper fan operation
Thermostat setting
NOTES:
Refrigerant Charge
•
Remember the condenser in the Proto-Aire EZ holds only a small amount of refrigerant. It is
therefore very easy to overcharge the Proto-Aire EZ unless care is taken during the charging
process.
•
Charging until the liquid sight glass is clear of bubbles will often overcharge the system causing
head pressure alarms. However, if the condenser has a subcooling circuit there should be a solid
liquid sight glass the majority of the time.
•
The initial / refrigerant charge should be through the liquid side of the system to prevent
liquid flood back to the compressors.
3090249_D
P/N
Proto-Aire EZ I/O Manual
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