Chapter 121 Flashcards
High head pressure in a refrigerating system usually indicates:
air or non-condensable gases are in the system
A sulphur candle is used to test for?
ammonia leaks
Two devices used to detect freon besides soap solutions are;
halide torch and electronic leak detector
What two checks can be used to determine if the charging of a refrigeration system is complete?
recommended weight from the manufacturer and sight glass on the reciever
What two checks can be used to determine if the charging of a refrigeration system is complete?
recommended weight from the manufacturer and sight glass on the reciever
Leak testing for tightness under pressure of a refrigeration system is done with an?
inert gas
What does air and other non condensable gases cause in a refrigeration system?
high head pressure
For refrigeration leak testing you may NOT use?
oxygen
When charging a refrigeration system it should be done with the liquid line shutoff valve? Open or closed?
closed
What is used in order to separate vapor from the noncondensable gases to be purged?
chilling coil in an automatic purger
The initial refrigeration charge is done where? High or low side?
high
Where on the high side of the refrigeration system do you add the refrigerant?
between the liquid shutoff valve and expansion valve
What can cause a high discharge pressure with refrigeration systems?
unit over-charged with refrigerant
What can cause a high discharge pressure with refrigeration systems?
unit over-charged with refrigerant
Frost formation on the suction line of a refrigeration system indicates what?
overcharging of the system
