A common type of defrost control used on air-source heat pumps is:
A) Time initiated and time terminated.
B) Time initiated and temperature terminated.
C) Demand defrost based on suction pressure.
D) Demand defrost based on compressor current draw.
B
You might also like to view...
Plot the oxygen sag curve for the river.
The Ganges River, shown in Figure 4.66, has an annual average flow rate of 12,105 m3/s. The average temperature of the Ganges River was reported to be 24.6ºC. The Ganges has become contaminated with raw sewerage and industrial waste so that the dissolved oxygen in the river upstream of sewerage discharges is 4.6 mg/L. Suppose that the raw sewerage that is untreated flows into the Ganges at a rate of 460 m3/s, the temperature is 25ºC, and the dissolved oxygen in the sewerage stream is completely depleted (i.e. DO = 0). How would you develop a plan for improving water quality in the Ganges River? What will be an ideal response?
Technician A says that a minor overhaul includes performing a valve job. Technician B says that a minor overhaul includes replacing the pistons. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
____ control valves are not used for high pressure application.
A. Single-seated B. Double-seated
If both a higher voltage and a higher current are desired, the cells or batteries can be connected in a ____ configuration.
A. series-resistant B. series-parallel C. series-opposing D. series-aiding