Precautions for New Refrigerant (R-410A)
SiUS28-902_B
168
Appendix
2. Torque wrench
Specifications
• Dimension B
Unit:in.
No change in tightening torque
No change in pipes of other sizes
Differences
• Change of dimension B
Only 1/2", 5/8" are extended
3. Vacuum pump with check valve
Specifications
• Discharge speed
Maximum degree of vacuum
50 l/min (50Hz)
Select a vacuum pump which is able to keep the
vacuum degree
60 l/min (60Hz)
of the system in excess of – 14.6 psi (5 torr –
755 mmHg).
• Suction port UNF7/16-20(1/4 Flare)
UNF1/2-20(5/16 Flare) with adaptor
Differences
• Equipped with function to prevent reverse oil flow
• Previous vacuum pump can be used by installing adaptor.
Nominal size
Class-1
Class-2
Previous
1/2
0.94
1.02
0.94
5/8
1.06
1.14
1.06
Dimension B
For class-1: R-407C
For class-2: R-410A
Vacuum pump adaptor
Reverse flow preventive
vacuum adaptor
