Refrig Lab Flashcards
Defrost method that uses heat from different sources other than the fixture air?
Supplemental defrost.
Uses an electric heating element installed on or in the evaporator surface?
Supplemental heat electrical resistance.
Uses hot gas from compressor discharge into evap. to melt ice/frost?
Hot gas defrost.
What is considered the fastest defrost in the refrigeration industry?
Hot gas defrost.
Uses water, brine, or glycol pumped through a separate path within an evap?
Supplemental heat, wash type.
Where is the Koolgas piped from on the receiver in the system?
Off the top to the evap.
Second most efficient source of defrost.
Intermediate, aka koolgas.
Type of defrost that occurs while the compressor is an off cycle?
Natural defrost, or off cycle defrost.
How many hours of runtime can a system using a defrost time clock run a day?
Up to 18 hours maximum.
What is the most reliable source of defrost? (Not based on efficiency.)
Timed off cycle utilizing a defrost time clock.
How many hours a day should a defrost run maximum?
8 hours.
Which is the temperature that is required to be raised at the evap. during a defrost cycle?
3.2 degrees f
What is the time a refrigeration cycle starts called, until the refrigeration flow has stabilized in the evap?
Recovery time.
