How does a pulse width modulated expansion valve operate?
What will be an ideal response?
Within a period of six seconds a voltage signal from the controller will be transmitted to and removed from the valve coil. If there is a demand for refrigerant, the valve will remain open for almost all of the six seconds. If there is little demand then the valve will only stay open for a fraction of the six second period. This type of valve includes a tight shut-off function that eliminates the need for an additional solenoid valve.
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What body motion should be used when adjusting a valve?
A. Pushing B. Pulling C. Left to right D. Right to left
If a relay starts the indoor fan in the cooling mode of a central air-conditioning system, it must be able to withstand the ____________________ of the fan motor on start-up.
Fill in the blank(s) with the appropriate word(s).
Technician A says that power line carrier (PLC) permits multiplexing to take place between a trailer and the tractor data bus on a non-dedicated wire. Technician B says that PLC messages are RF-superimposed over the blue 12-volt auxiliary power supply between the tractor and trailer. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Loop start signaling and ground start signaling tell the switch that a telephone is ________-hook
Fill in the blank(s) with correct word