Appliance Charging and Operation Flashcards
What is a compressor designed to pump?
Vapor refrigerant
On a “Refrigeration System”, what is the first component “Downstream” of the condenser coil?
Liquid receiver
On a “Heat Pump System”, what is the first component downstream of the evaporator?
The accumulator
In an air conditioning system, what provides cooling?
Vaporization of refrigerant.
What generally does a high superheat mean on an air conditioner with a fixed metering device (piston/capillary tube)?
The system is low in refrigerant.
What does a “Strong Odor” detected in refrigerant mean?
The compressor may have experienced a burnout.
According to the EPA, what is the best way to clean/remove ice from a sight glass?
Alcohol / Isopropyl Alcohol
What does “Hygroscopic” mean?
Something has a high affinity for moisture.
Can refrigerants or refrigerant oils ever be mixed “in the field?”
No
What purpose does a crankcase heater serve?
It heats the compressor to prevent refrigerant from migrating into the oil when the ambient temperature is low.
What happens when refrigerant is in the oil during start-up?
Oil foaming
What is the MAXIMUM reading on the high side of a compound manifold gauge?
600 - 800 PSIG
What measurements does the low side of a compound manifold gauge read?
PSIG and In. Hg.
What keeps the compressor cool during operation?
The flow of vapor refrigerant.
What is the ONLY way to ACCURATELY charge a refrigeration system?
Weigh in the refrigerant.
