Type I — Small Appliances第 106 / 240 题
A technician wants to recover refrigerant faster from a small appliance in cold weather when system pressure is very low. Which safe method raises pressure to aid recovery?
a.Warm the appliance or its heat exchanger gently, for example with warm water or a heat gun
b.Add nitrogen to push the refrigerant out through the recovery machine
c.Connect the recovery cylinder to a 120-volt heater strip inside the coil
d.Pressurize the low side with shop air
解析
Gentle warming of a cold small appliance raises the refrigerant's saturation pressure, helping it flow into the recovery equipment faster. Adding nitrogen or shop air would contaminate the recovered refrigerant with noncondensables and is not acceptable practice. Any warming should be gentle to avoid damaging the system or overheating oil.
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