Type III — Low-PressureQuestion 170 of 240
A low-pressure refrigerant is defined as one with a boiling point at atmospheric pressure that is:
a.Below minus 50°F
b.Above about 50°F
c.Exactly 32°F
d.Between minus 50°F and 10°F
Explanation
Low-pressure refrigerants boil above roughly 50°F at atmospheric pressure, so the appliance operates at or below atmospheric pressure. Refrigerants boiling between minus 50°F and 10°F are high-pressure, and those below minus 50°F are very-high-pressure. This boiling-point distinction sets which certification type applies.
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