1
The state of the refrigerant in the suction line should be _____.
Low Pressure/Low Temp Vapor
The standard unit for measuring the quantity of heat in a substance is _____.
BTU
The sequential order of steps in the vapor compression process are:
vaporization, compression, condensation, expansion
A compound pressure gauge measures _____.
pressure and vacuum
Heat which causes a change in temperature of a substance is called _____.
Sensible Heat
The _____ transfers heat from the refrigerated space to the refrigerant.
Evaporator
An accumulator is used to:
prevent liquid refrigerant from reaching the compressor
A liquid receiver is used to:
Used to store liquid refrigerant
A temp difference across filter driers indicates
Restricted Filter
A refrigerant gives up heat when it _____.
Condenses
In an ac system that uses a thermostatic expansion valve, the temp of the evaporator outlet __
will usually be warmer than the evaporator inlet
The movement of heat through a solid object is called _____.
Conduction
The movement of heat by way of fluid or air is called _____.
Convection
A drain trap should be installed on a split system when the:
air handler drain is on the negative air side
A scroll compressor moves refrigerant by means of _____.
Involute Spirals
Heat added to the refrigerant in a vapor state after the evaporation process is called _____.
Superheat
Liquid slugging is:
liquid refrigerant in the compressor clearance space
An air conditioning system that is oversized can cause:
inefficient dehumidification of the conditioned space
A low refrigerant charge in an ac system will cause these symptoms :
low suction pressure & low discharge pressure
A faulty condenser fan motor on an ac system will cause these symptoms :
high suction pressure & high discharge pressure
The purpose of an evaporator pressure regulating valve (EPR) is to:
prevent evaporator pressure from falling below a set limit
A compressor that has a broken reed valve will cause these symptoms:
high suction pressure & low discharge pressure
The thermostatic expansion valve has three operating pressures:
evaporator pressure, spring pressure, sensor bulb pressure
Fan airflow pressures are usually measured in _____.
inches of WC
A dirty evaporator in an ac system will cause these symptoms :
low suction pressure & low discharge pressure