Type III — Low-PressureQuestion 198 of 240
The deep 25 mm Hg absolute recovery requirement exists for low-pressure appliances because:
a.Their charge is very small
b.Their refrigerant boils near room temperature and must be pulled out thoroughly under deep vacuum
c.They contain no oil
d.They operate above atmospheric pressure
Explanation
Low-pressure refrigerant boils near room temperature, so recovering it fully requires pulling the appliance down to a deep vacuum of 25 mm Hg absolute to draw out the remaining vapor. Shallow vacuums would leave significant refrigerant behind. The deep level ensures thorough recovery from these vacuum-operating machines.
Law Reference: 40 CFR §82.156Practice all 240 questions free — no signup required.
Related questions on this topic
- Which of the following is NOT a low-pressure appliance refrigerant?
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- The main safety concern that sets the 10 psig pressurization limit on low-pressure appliances is:
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