To manually defrost a frozen evaporator coil, technicians should:
A) Chip away the ice from the coil using a tool designed for chipping ice.
B) Use any available sharp object to chip away ice from the coil.
C) Use a heat gun to accelerate the melting of the ice.
D) Spray the ice with liquid refrigerant, which will boil and melt the ice.
C
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An RC low-pass filter has Z1 = R1 = 1k?, Z2 = 1/(j?C) with C= 0.01µF has |H(?)|2 = 0.5 at frequency f= ____(xx.x) kHz.
Fill in the blank(s) with the appropriate word(s).
What do most lane departure warning system use to monitor road features?
What will be an ideal response?
Why is testing and balancing an important part of HVACR residential systems?
A) Because HVACR systems are not as efficient as they were in earlier decades B) Because HVACR systems are the largest energy appliances in a residence and energy costs have increased C) Because all new home construction must be certified D) Because it is the first and last step a technician must perform when working on HVACR systems
The speed of air is measured in
A) feet per minute - FPM B) capacity per minute - CFM C) force per minute - FPM D) cubic feet per minute - CFM