Carrier 69NT40-561-300, Руководство по эксплуатации и обслуживанию

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7–5 T-365
7.6 EVACUATION AND DEHYDRATION
7.6.1 General
Moisture is detrimental to refrigeration systems. The presence of moisture in a refrigeration system can have many
undesirable effects. The most common are copper plating, acid sludge formation, “freezing-up” of metering devices
by free water, and formation of acids, resulting in metal corrosion.
7.6.2 Preparation
1. Evacuate and dehydrate only after pressure leak test (refer to Section 7.5 ).
2. Essential tools to properly evacuate and dehydrate any system include a vacuum pump (8 m3/hr = 5 cfm
volume displacement) and an electronic vacuum gauge. The pump is available from Carrier Transicold, P/N
07-00176-11. The magnet is P/N 07-00512-00. The micron gauge is P/N 07-00414-00.
3. If possible, keep the ambient temperature above 15.6°C (60°F) to speed evaporation of moisture. If the
ambient temperature is lower than 15.6°C (60°F), ice might form before moisture removal is complete. Heat
lamps or alternate sources of heat may be used to raise the system temperature.
4. Additional time may be saved during a complete system pump down by replacing the filter drier with a sec-
tion of copper tubing and the appropriate fittings. Installation of a new drier may be performed during the
charging procedure.
Figure 7.4 Refrigeration System Service Connections
1. Liquid Service Connection
2. Economizer Solenoid Valve
3. Receiver or Water Cooled Condenser
4. Compressor
5. Discharge Service Connection
6. Suction Service Connection
7. Vacuum Pump 8. Electronic Vacuum Gauge
9. Manifold Gauge Set
10. Refrigerant Cylinder
11. Reclaimer
12. Discharge Loader Valve
13. Discharge Unloader Valve
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