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A residential HVACR communicating control system includes (you may select more than one):
A dedicated wireless router made specifically for HVACR.
Communicating equipment control boards.
A communicating thermostat or controller.
Communicating variable–refrigerant–velocity mini–split systems can save energy by matching the
________ capacity to the demand.
Line voltage thermostats can usually switch:
Examples of load devices include:
Overloads, door switches, and limit switches.
Thermostats, pressure switches, and overloads.
Motors, thermostats, overloads, heaters, and switches.
Motors, resistance heaters, and solenoid valves.
ClimateTalk controls are available for (you may select more than one):
A resistor with a color banding of orange (3), yellow (4), red (2) and silver would have a value of:
34,000 with a 5 percent tolerance.
24,000 with a 10 percent tolerance.
342 with a 10 percent tolerance.
3,400 with a 10 percent tolerance.
The actual location of various components in the system and their point–to–point wiring is shown
in this diagram.
Most residential communicating systems use ________ wires between all components.
What is the common sensing element used in an electronic thermostat?
A silicon–controlled rectifier or SCR
Relay coils and the contacts they operate are not shown in the same place on a schematic diagram
because:
Schematic diagrams typically only show where to connect the power wiring.
There is not enough room to draw them in the same place.
Components are placed by their function in the circuit, not their actual physical location.
The coil and contacts are located in different places in the unit.
Communicating systems record the system ________ history, allowing service technicians to view
the problems that have occurred in each of the system components.
The bimetal element is composed of:
A rare earth element known as bimetal.
Two different metals bonded together.
A metal alloy known as bimetal.
Any metal that changes from one type of metal to another when current passes through it.
What do the vertical parallel lines on a ladder–type wiring diagram represent?
Examples of control devices include:
Thermostats, pressure switches, and humidistats.
Compressors, signal lights, and defrost timers.
Compressors, thermostats, pressure switches, and heaters.
Motors, resistance heaters, and solenoid valves.
Which load(s) are energized all the time, even when the thermostat is not set to heat or cool and
the fan is set to auto?
What other diagrams are similar to point–to–point diagrams?
One yellow wire on the transformer secondary connects to the R terminal, and the other yellow
secondary wire connects to:
If a schematic diagram shows a clear path from L1 to L2, without passing through any load, then
what condition exists in the circuit?
Point–to–point diagrams are useful for determining:
The unit operating sequence.
The actual wire routing to and from each terminal connection.
What size power wire is required for the unit.
What information do label diagrams provide?
They include a component location diagram and a wiring diagram.
They identify the system operating voltage, minimum circuit ampacity, and maximum
overcurrent protection.
They identify where all the manufacturer’s data plates and model numbers are located on
the system.
They explain how to read the labels on the equipment.
Installation wiring diagrams are used for:
Location of all electrical components.
Showing the location of necessary field wiring.
Showing unit operational sequence.
Tracing individual circuits.
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
Motor protection devices can either be temperature actuated, current actuated, or a combination
of current and temperature.
Besides using a 20,000 Ohm 2 watt resistor capacitors can be safely discharged by setting a meter
to read DC volts.
The motor starter is switched on and off by the motor relays that are switched on and off by the
control relays.
When measuring the leads of a multispeed shaded pole motor, there should be measurable
resistance between all of the leads.
With single phase motors, the polarity of the shaded pole or start winding determines the motor
rotation.
MATCHING. Choose the item in column 2 that best matches each item in column 1.
Match the letter designations with the heat pump system function.
Match the letter with the correct standard heat–cool system function.
Match the letter designations with the heat pump system function.
Match the letter with the correct standard heat–cool system function.
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40
Answer Key
Testname: UNIT 31 TO 40