Type I — Small AppliancesQuestion 106 of 240
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.Pressurize the low side with shop air
b.Connect the recovery cylinder to a 120-volt heater strip inside the coil
c.Add nitrogen to push the refrigerant out through the recovery machine
d.Warm the appliance or its heat exchanger gently, for example with warm water or a heat gun
Explanation
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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