Regulations & Safety第 68 / 240 题
A technician charging a high-pressure R-410A system should be especially aware that, compared with R-22, R-410A operates at:
a.Much lower pressures, so standard R-22 gauges are fine
b.The same pressures as R-22
c.Lower pressures that pose no equipment concern
d.Significantly higher pressures, requiring properly rated gauges, hoses, and cylinders
解析
R-410A operates at significantly higher pressures than R-22, roughly 50 to 70 percent higher, so technicians must use gauges, hoses, and recovery equipment rated for those pressures. Using R-22-rated equipment on R-410A is unsafe because it may not withstand the higher pressure. Matching equipment ratings to the refrigerant is a basic pressure-hazard precaution.
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