Evacuation And Dehydration; General; Preparation; Evacuate And Dehydrate - Complete System - Carrier PrimeLINE Operation And Service Manual

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 completing a pressure leak test. See
2. Essential tools to properly evacuate and dehydrate any system include a vacuum pump (8m3/hr = 5 cfm
volume displacement) and an electronic vacuum gauge. The pump is available from Carrier Transicold, P/N
07-00176-11. 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
section of copper tubing and the appropriate fittings. Installation of a new drier may be performed during the
charging procedure.
11
9
1) Economizer Solenoid Valve
2) Receiver or Water Cooled Condenser
3) Compressor
4) Discharge Service Connection
5) Suction Service Connection
6) Vacuum Pump
7.6.3

Evacuate and Dehydrate - Complete System

See Partial System procedure for information pertaining to partial system evacuation and dehydration.
1. Remove all refrigerant using a refrigerant recovery system.

Figure 7.4 Refrigeration System Service Connections

2
1
10
8
3
S D
7
7) Electronic Vacuum Gauge
8) Refrigerant Cylinder
9) Reclaimer
10) Manifold Gauge Set
11) Liquid Service Connection
- - - - -
NOTE
7–5
Section 7.5.
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5
6
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