Question 1

HVAC system

Accepted Answer

The system responsible for providing heating, ventilation, and air conditioning in a transit bus.

Question 2

Blower motor

Accepted Answer

The motor that powers the air circulation in the HVAC system.

Question 3

Compressor

Accepted Answer

The component that pressurizes and circulates the refrigerant in the air conditioning system.

Question 4

Evaporator coil

Accepted Answer

The component in the HVAC system where the refrigerant absorbs heat from the air.

Question 5

Condenser coil

Accepted Answer

The component in the HVAC system where the refrigerant releases heat to the outside air.

Question 6

Expansion valve

Accepted Answer

The component that regulates the flow of refrigerant into the evaporator coil.

Question 7

Refrigerant

Accepted Answer

The substance used in the HVAC system to transfer heat between the indoor and outdoor units.

Question 8

Cabin air filter

Accepted Answer

A filter that removes dust, pollen, and other particles from the air before it enters the cabin.

Question 9

Pressure gauge

Accepted Answer

A tool used to measure the pressure of the refrigerant in the HVAC system.

Question 10

Thermostat

Accepted Answer

A device that senses the temperature and controls the operation of the HVAC system.

Question 11

Refrigerant recovery machine

Accepted Answer

A device used to remove refrigerant from the HVAC system during service or repair.

Question 12

Condenser fan

Accepted Answer

The fan that helps dissipate heat from the condenser coil to the outside air.

Question 13

High-pressure switch

Accepted Answer

A safety device that shuts off the compressor if the refrigerant pressure exceeds a certain limit.

Question 14

Low-pressure switch

Accepted Answer

A safety device that shuts off the compressor if the refrigerant pressure drops below a certain limit.

Question 15

Heater core

Accepted Answer

The component in the HVAC system that provides heat for the cabin.

Question 16

Blend door

Accepted Answer

A door or flap that controls the mixture of hot and cold air in the HVAC system.

Question 17

Defrost mode

Accepted Answer

A mode in the HVAC system that directs warm air to the windshield and side windows to remove condensation or ice.

Question 18

HVAC control panel

Accepted Answer

The interface through which the driver or passengers can adjust the settings of the HVAC system.

Question 19

Expansion valve orifice tube

Accepted Answer

A device that controls the flow of refrigerant into the evaporator coil in some HVAC systems.

Question 20

Suction line

Accepted Answer

The refrigerant line that carries low-pressure vapor from the evaporator coil to the compressor.

Question 21

Discharge line

Accepted Answer

The refrigerant line that carries high-pressure vapor from the compressor to the condenser coil.

Question 22

Receiver-drier

Accepted Answer

A component that removes moisture and filters debris from the refrigerant before it enters the expansion valve.

Question 23

HVAC system diagnostics

Accepted Answer

The process of troubleshooting and identifying problems in the HVAC system.

Question 24

Refrigerant leak detection

Accepted Answer

The process of locating and repairing refrigerant leaks in the HVAC system.

Question 25

HVAC system evacuation

Accepted Answer

The process of removing air and moisture from the HVAC system before charging it with refrigerant.

Question 26

HVAC system recharge

Accepted Answer

The process of adding the correct amount of refrigerant to the HVAC system.

Question 27

HVAC system retrofit

Accepted Answer

The process of modifying an older HVAC system to use a different refrigerant.

Question 28

Electrical troubleshooting

Accepted Answer

The process of diagnosing and fixing electrical issues in the HVAC system.

Question 29

Heater control valve

Accepted Answer

A valve that controls the flow of coolant to the heater core in a water-based HVAC system.

Question 30

Heater hoses

Accepted Answer

The hoses that carry hot coolant from the engine to the heater core and back.

Question 31

Refrigerant recovery

Accepted Answer

The process of safely removing refrigerant from the HVAC system for recycling or disposal.

Question 32

HVAC system insulation

Accepted Answer

The use of insulating materials to prevent heat loss or gain in the HVAC system.

Question 33

HVAC system air distribution

Accepted Answer

The process of directing and controlling the flow of conditioned air to different areas of the bus.

Question 34

HVAC system blower control

Accepted Answer

The control mechanism that adjusts the speed of the blower motor.

Question 35

Cabin temperature sensor

Accepted Answer

A sensor that measures the temperature inside the cabin and provides input to the HVAC system.

Question 36

HVAC system maintenance

Accepted Answer

Regular upkeep and servicing of the HVAC system to ensure optimal performance and longevity.

Question 37

HVAC system airflow adjustment

Accepted Answer

The process of adjusting the airflow volume and direction in the HVAC system.

Question 38

HVAC system mode selection

Accepted Answer

The selection of different operating modes such as heating, cooling, fan only, or defrost.

Question 39

HVAC system pressure testing

Accepted Answer

The process of testing the pressure levels in the HVAC system to identify leaks or blockages.

Question 40

HVAC system temperature control

Accepted Answer

The ability to set and maintain the desired temperature within the cabin.

Question 41

HVAC system component replacement

Accepted Answer

The process of removing and installing new components in the HVAC system.

Question 42

HVAC system wiring diagram

Accepted Answer

A schematic representation of the electrical connections and components in the HVAC system.

Question 43

HVAC system performance testing

Accepted Answer

Evaluating the overall performance and efficiency of the HVAC system.

Question 44

HVAC system refrigerant charging

Accepted Answer

The process of adding or removing refrigerant to achieve the correct charge level.

Question 45

HVAC system troubleshooting

Accepted Answer

The systematic process of identifying and resolving issues in the HVAC system.

Question 46

HVAC system evaporator drain cleaning

Accepted Answer

Clearing any blockages in the drain line to prevent water buildup and potential damage.

ASE Transit Bus HVAC Flashcard Set