Fundamentals of HVAC
Electrical Troubleshooting
Components of a an AC system
Molecules as they pertain to HVAC
Heat pumps
100

Suction line temperature - Vapor Saturation

What is Superheat?

100

0 volts at control board with a good fuse and all safeties intact

What is a bad transformer?

100

Pumps refrigerant through the system

What is the compressor?

100

Changing states from liquid to gas

What is evaporation?

100

Changes direction of refrigerant?

What is a reversing valve?

200

Liquid Saturation - Liquid line temperature

What is superheat?

200

120 volts on 1 leg at condenser, 0 volts on 2nd leg

What is a bad fuse?

200

Causes "flashing" into evaporator coil

What is a metering device?

200

Changing states from liquid to solid

What is freezing?

200

Typically energized to produce heat in defrost mode

What are heat strips?

300

Erratic pressures and Oscillation in compressor

What is Non-Condensables in system?

300

Typical voltage of a Heat Pump Air Handler

What is 240 volts?

300

Forces heat out of outdoor unit

What is the condenser fan motor?

300

Changing states from gas to liquid

What is condensation?

300

Forces reversing valve to "shift"

What is refrigerant pressure?

400

Suction pressure and Discharge pressure equalized while system is running

What is a Non-Pumping compressor?

400

The breaker for outdoor unit constantly trips on call for cooling

What is a grounded compressor?

400

Allows refrigerant to flow only one way

What is a check valve?

400

Also known as CFC's

What are Chlorofluorocarbons?

400

Prompts system to go into defrost mode

What is the outdoor coil temp sensor?

500

The state of refrigerant before it enters metering device

What is liquid?

500

Condenser motor not running but works when blade is spun manually

What is a bad capacitor?

500

Absorbs heat from within the occupied space

What is the evaporator coil?

500

Also known as HFC's

What are Hydrofluorocarbons?

500

The wires typically assigned in a heat pump system

What is R, C, Y, G, O/B, W2?