Appendix C – Glossary
- accessories
- optional parts added to equipment or system
- access equipment
- equipment used to allow mechanics to reach work location (e.g. ladder, scaffolds, personnel lift)
- accumulator
- a vessel in the suction line that collects liquid refrigerant to be boiled off
- analog controls
- controls which are continuously variable between two points
- commission
- final start-up activities before a system is fully functional that ensures the system meets design specifications and client requirements
- component
- parts required as part of a system
- compressor
- component that creates pressure differential in a system that allows a refrigerant to flow
- condenser
- heat rejection component that provides a state change of refrigerant (from vapour to a liquid)
- control system
- electrical, electronic, mechanical and pneumatic components and wiring that are used to operate and protect the system
- digital controls
- control that use an on/off signal
- evaporator
- heat absorption component that provides a state change of refrigerant (from liquid to a vapour)
- field wiring
- wiring required to be done on site
- flow control
- device for controlling the flow of primary and secondary refrigerants (e.g. crankcase pressure regulator [CPR], evaporator pressure regulator [EPR], solenoid valve)
- fluid cooler
- a heat rejection device that cools a secondary heat transfer medium
- heat exchanger
- device used to transfer heat energy from one medium to another
- holding charge
- temporary or partial charge used for the protection of the system until commissioning
- humidifier
- device that introduces water vapour to conditioned space in order to raise relative humidity
- humidity
- a measurement of moisture in air
- internal wiring
- wiring inside the system that includes factory and optional wiring
- maintain
- performing functions to prevent premature deterioration and breakdown of system
- metering device
- device designed to regulate flow of liquid refrigerant entering the evaporator
- oil separator
- device used to remove oil from refrigerant
- material take-off
- the listing of material and components required for a project as taken from design drawings and job requirements
- predictive maintenance
- monitoring system components for future replacement or repair using methods such as vibration analysis and sensory inspection
- pressure control
- pressure-activated safety or operational control
- receiver
- storage vessel for liquid refrigerant
- refrigerant
- heat transfer fluid used in a primary or secondary refrigeration system
- refrigeration
- transferring of heat from a place where it is not wanted to a place where it is unobjectionable
- regulator
- device that controls voltage or the pressure of liquid or gases
- repair
- fix system by repairing or replacing components and accessories
- replace
- change a component on a system
- sensory inspection
- inspection done without tools using sight, smell, touch and sound
- service
- troubleshoot and repair system
- solenoid valve
- device that permits or stops liquid and gas flow
- terminate
- final connection of wiring or tubing to any device
- trade standards
- procedures based on codes, regulations, manufacturers’ recommendations and best practices
- transducer
- electronic device that sends a digital or analog signal to a control board
- troubleshoot
- diagnosing system failures and malfunctions
- utilities
- services such as electricity, drainage, water or gas provided by the city or utility companies