Specifications

Precautions for New Refrigerant (R-410A) SiUS34-907
252 Precautions for New Refrigerant (R-410A)
• Low pressure gauge
– 14.5 to 551 psi (– 76 cmHg to 38 kg/cm
2
)
• 1/4" → 5/16" (2min → 2.5min)
• No oil is used in pressure test of gauges.
→ For prevention of contamination
• Temperature scale indicates the relationship between pressure and temperature in gas saturated state.
 Differences
• Change in pressure
• Change in service port diameter
7. Charge hose for R-410A
 Specifications
• Working pressure 737 psi (51.8 kg/cm
2
)
• Rupture pressure 3684 psi (259 kg/cm
2
)
• Available with and without hand-operate valve that prevents refrigerant from outflow.
 Differences
• Pressure proof hose
• Change in service port diameter
• Use of nylon coated material for HFC resistance
8. Charging cylinder
 Specifications
• Use weigher for refrigerant charge listed below to charge directly from refrigerant cylinder.
 Differences
• The cylinder can not be used for mixed refrigerant since mixing ratio is changed during charging.
When R-410A is charged in liquid state using charging cylinder, foaming phenomenon is generated inside
charging cylinder.
(Hose with ball valve)
Can not be used