Transfair Engineering Survey:
Evacuation of Cooling Circuits
in the Household Refrigerator
Industries Today
Walter Dirk Adler
Düsseldorf 11/2006
Transfair GmbH
Mörsenbroicher Weg 179
D-40470 Düsseldorf /Germany
Email: Transfair_GmbH@t-online.de
Internet: www.transfair.info
Content
2.
Evacuation of R134a and R600a Systems
9
2.1.
Evacuation Problems: Removal of Moisture and Non-Condensable Gases
9
2.2.
Single vs. Two-Side Evacuation: Single Side Evacuation Tests
9
Test Procedures and Results
9
2.3.
Evacuation Process
10
2.3.1. Pre-Evacuation, Stop of Evacuation and Continuation
10
2.3.2. Pre-evacuation, Compressor Run and Final Evacuation
10
2.3.3. Flushing with R600a
11
2.4.
Evacuation Cycles
11
2.5.
Vacuum Pumps
12
2.5.1. 2-Stages Rotary Vane Pumps
12
Characteristics of Pumps, Gas ballast Removal, Oil Level Control, Oil change
12
2.5.2. Comparison Table of Standard 2-Stages Rotary Vane Pumps
13
Anti-Suck Back Valves, Suction Oil Separator or Glass Trap
14
2.6.
Carousels
14
Evacuation Carousel Layout Types , Quantity of Pumps needed
15
2.7.
Vacuum pump oil
16
2.8.
Converting Pumps from Evacuation of HFC-134a to HC-600a
16
2.9.
Special Conditions for Using of R600a and R134a (or R134a and R12) in the same Evacuation or Charging line 17
Oil Problem and Separation of Mineral from Ester Oil in Evacuation and Charging Lines, Mixed
17
Production Lines, Evacuation Pumps, Suction Oil Separators, Mineral and Ester oil
2.10. Vacuum-meter
17
2.11. Vacuum tight quick couplers and tube adapters
18
2.12.
Pressure Unit Conversion Table
18
Transfair Engineering: Evacuation, chargin