HVAC Fundamentals
The direction in which heat moves
From Hot to Cold
The process of removing heat from one area and rejecting it elsewhere.
Refrigeration
The component that stores electrical energy to help motors start.
Capacitor
The unit used to measure airflow
CFM (Cubic Feet per Minute
The device that moves air through ductwork.
Blower
The four main components of the basic refrigeration cycle.
Compressor, Evaporator, Condenser, Metering device
Do this if you have a 24v short on a thermostat wire.
Use another available wire or replace the wire
The device that helps balance airflow in duct systems.
Damper
The condition where the evaporator coil temperature is below the dew point of the return air causes this process to occur.
Condensation
Superheat and subcooling are used to check this.
Refrigerant charge or system performance
This is usually controlled by 24v controls, and allows transfer of power to another component.
Relay
The tool used to measure static pressure.
Manometer or Magnehelic
This term describes the amount of heat required to change 1 pound of water by 1°F.
BTU or British Thermal Unit
The refrigerant enters this component as a low-pressure gas and leaves as a high-pressure gas.
Compressor
This measurement defines the max amp draw to start a compressor
LRA or Lock Rotor Amps
A high static pressure reading usually means this type of problem.
Airflow restriction or improper duct sizing
The measure of an air conditioner's efficiency.
SEER or Seasonal Energy Efficiency Rating
The component where refrigerant absorbs heat.
Evaporator
The electrical component that protects a circuit from overcurrent.
Fuse or Breaker
This is what TESP stands for
Total External Static Pressure