List the different types of staging that can be used for air handler compressors using direct expansion coils
What will be an ideal response?
Compressor start & stop, liquid line solenoid valve, cylinder unloaders, hot gas bypass.
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As a general rule for stable flip-flop triggering, the clock pulse rise and fall times must be:
A) very short. B) at a maximum value to enable the input control signals to stabilize. C) of no consequence as long as the levels are within the determinate range of values. D) very long.
Technician A says that backup sensors use LEDs to detect objects. Technician B says that a backup sensor will not work correctly if the paint is thicker than 0.006 inch. Who is right?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Why do solenoid-type valves pose a problem for some types of burners?
A) Solenoids create too much pressure when closing. B) Solenoids' seal is not strong. C) Solenoids open and close too quickly. D) Solenoids open and close too slowly.
What is the difference between the melting and freezing points?
What will be an ideal response?