Electricity for HVAC, Chapter 6, Reading Schematic Diagrams 2023

Electricity for HVAC, Chapter 6, Reading Schematic Diagrams 2023 Why should an air conditioning technician learn to read schematic diagrams? - correct answer The schematic diagram is one of the most important tools available to the HVAC technician in the field. schematic diagram tells how, when, and why a system works as it does. Briefly explain the layout of a schematic diagram - correct answer Most schematic diagrams resemble a ladder with vertical lines representing the incoming electrical source. Most electrical circuits shown in a schematic diagram are arranged between these lines, with symbols to represent electrical components in the system Most schematic diagrams are made up of __________ - correct answer Series parallel circuits Schematic diagrams break the wiring of control systems down into a(n) __________ arrangement - correct answer Circuit by Circuit What is the name of an appliance that is used to remove moisture? - correct answer Dehumidifier Under what condition would a control relay be used in a control system? - correct answer When larger loads require larger contactors be powered off line voltage. A control relay will be used on the 24 volt circuit to control the larger contactor. What is the purpose of a lockout relay? - correct answer A lockout relay is a relay that can open a control circuit in an air conditioning system and remain open until the occupant or the service technician resets the thermostat or the power supply, depending on whether the lockout relay is low or line voltage True or false: a two-stage cooling thermostat would be used on a system with one condensing unit - correct answer false What is the purpose of the defrost cycle of a heat pump? - correct answer To defrost the outside coil. This is done by temporarily reversing the cycle and using the cooling mode of operation to defrost coil What is a pump down system and why is it used in commercial refrigeration systems? - correct answer A pump down system stops the liquid flow of refrigerant with a solenoid valve in the liquid line and allows the compressor to transfer most of the refrigerant from the low side to the high side of the refrigeration system. this type of cycle is used on