The most common type of defrost control used on air source heat ...

[magmichele12]

The most common type of defrost control used on air source heat pumps is
 
  A) Time initiated and temperature terminated
  B) Time initiated and time terminated
  C) Demand defrost based on compressor current draw
  D) Demand defrost based on suction pressure

Question 2

On a time temperature defrost control, what determines the amount of time before the defrost cycle starts?
 
  A) the outdoor temperature B) the coil pressure drop
  C) the coil temperature D) the operating time

[iman]

Answer to Question 1

A

Answer to Question 2

D

[magmichele12]

TYSM

[pangili4]

Excellent