HVAC Basics
What does HVAC stand for?
Heating, Ventilation, and Air Conditioning
What tool measures voltage, amps, and resistance?
Multimeter
You arrive onsite and the RTU won't turn on at all—first thing you check?
Power / breaker / disconnect / Thermostat call
Daikin's North American headquarters are located in what state?
Texas
The thermostat is blank and the unit will not run. What should you check first?
power, breaker, disconnect, transformer
This component moves air through the the duct system.
Blower / Fan
What does AHU stand for?
Air Handling Unit
What tool is used to measure refrigerant pressure?
Gauges / Manifold Gauge Set
The unit is running but the space temperature keeps rising. What is one common thing you should check?
Dirty filters, belts, airflow, condenser coil, low charge
What HVAC manufacture is considered the largest in the world?
Daikin
The supply fan is running, but airflow is weak throughout the building. What's one likely cause?
Dirty filter, broken belt, plugged coil, duct issue
This outdoor component rejects heat to the outside air.
Condenser
What component pumps refrigerant through the system?
Compressor
What tool detects refrigerant leaks electronically?
Leak Detector
A package unit keep starting and stopping every few minutes. What is this called?
Short cycling
What manufacturer invented VRV/VRF Technology?
Daikin
The system is blowing warm air during cooling mode. What's one common cause?
compressor not running, low refrigerant, reversing valve issue
This component stores and releases electrical energy to help motors start and run.
Capacitor
What are the four main components of a refrigeration cycle?
Compressor, Condenser, Expansion Device/metering device/txv, Evaporator
What tool is used to measure airflow in ducts?
Anemometer
You find oil around a flare fitting or brazed joint. What does this indicate?
Refrigerant leak
What does VRV stand for?
There’s ice forming on the evaporator coil. What’s likely happening?
Low airflow or low refrigerant
This is an electrically controlled switch that turns high-voltage equipment on and off.
Contactor
What happens to refrigerant inside the evaporator coil?
It absorbs heat and boils into a vapor
What machine revmoves moisture and non-condensables before charging a system?
Vacuum Pump
A TXV is stuck closed. What symptom would you likely see at the evaporator?
Starved coil, low suction pressure, low superheat issues, little cooling
Qeustion True or False - Daikin is the only HVAC manufacture with a major U.S. sports stadium named after the company.
True
The outdoor unit is running, but the indoor fan is not. What could be wrong?
Blower motor / capacitor / control issue
This component removes moisture and contaminants from refrigerant.
Filter Drier