What is the filler metal used to join two copper pipes together without cleaning, because you heat the pipes to almost 1500 degrees and therefore it becomes clean?
100
Fill your refrigeration system with nitrogen to a specified amount and let it sit for about fifteen minutes to make sure you do not lose pressure
What is a standing pressure test?
100
the red numbers, below 0 psi, on the low side gauge indicate this
What is a vacuum or inches of mercury?
100
410-A, the pink bottle, must be charged as this, because it is a blend and if not, the system will be compromised
What is as a liquid? (upside down)
100
this device can replace shradder cores without recovering refrigerant and is also handy in speeding up evacuation times
What is a shradder core removal tool?
200
a cleaner used to minimize oxidation build up on copper pipes while being heated
What is flux?
200
A solution used to check for leaks while you are doing the standard pressure test
What are soap bubbles?
200
use this device to indicate you are in a deep vacuum
What a micrometer or a micron gauge?
200
Use one of these to determine exactly how much refrigerant is being charged into a system
What is an electronic charging scale?
200
It is good practice, when recovering, to wait until this PSI to turn off and disconnect your recovery machine
What is 10 inches of vacuum or 10 inches of mercury?
300
this gas should be purged through the pipes to minimize oxidation, it is 78 percent of our atmosphere
What is nitrogen?
300
Use this leak detection method to amplify the sound of leaks, you will need head phones
What is ultrasonic?
300
250 - 500 microns indicate this
What is a deep vacuum?
300
dumping straight liquid into a compressor is called this, usually causing the compressor to fail prematurely
What is slugging?
300
no matter how big or small the recovery tank, you can only fill up to this percentage of the tank
What is 80 percent?
400
this 95/5 mixture only needs about 300 -500 degrees in order to melt
What is soft solder?
400
a color solution added to the system that can be found outside the system using a black light device
What is florescnet dye?
400
pull your system to a deep vacuum 3 times while charging the system with nitrogen in between each cycle
What is a triple evacuation?
400
this is the side of the system you add refrigerant to while the system is operating
What is the low side?
400
Use this type of recovery when the system has an inoperable compressor
What is active recovery?
500
this tool will crimp fittings, which have gaskets, to the pipe to make a seal without heating the pipes
What is a pro press?
500
the acceptable pressure of refrigerant allowed when leak checking with an electronic leak detector and nitrogen
What is 20 psi?
500
these 2 substances are the reason we evacuate in the first place
What are moisture and non-condensibles
500
the method of charging a system when you have a thermostatic expansion valve for a metering device
What is sub-cooling?
500
this is the temperature range you are looking for when taking a temperature differential across the evaporator coil in the cooling mode