Core
Which exams does a technician need to pass in order to obtain a universal certification?
Core + Type I + Type II +Type III
Which are recommended safe work practices when recovering refrigerant
Wear safety eyewear and blue-lined gloves when connecting/disconnecting hoses
When trying to figure out the leak rate calculations on a package unit. What information can you use?
Charge stated on name plate
Low pressure appliances operate...
In a vacuum or below atmospheric pressure.
What is the normal position of a service valve " king valve"?
Back seated
A technician with a Type III certification can repair what type of appliances?
Low pressure appliances such as chillers
When R-410A is recovered from an appliance, it
Should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants does not occur.
How long must an HVAC servicing company keep records for each disposed app charge between 5 and 50 pounds?
3 years
Where does the purge unit take its suction from?
The top of the condenser
When could a reciprocating compressor can be damaged if energized?
When the discharge service valve is closed
Can you work under someone else's certification?
No
What is the maximum allowable factory charge of refrigerant for type 1 appliances using CFC’s, HCFC’s, or HFC’s?
5 pounds
A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Which leak rate category would this chiller be in?
Industrial process refrigeration
What do CFC-11, HCFC-123, HFC-245fa, and HFO-1233zd have in common?
They are low pressure refrigerants that have high boiling points
How long does an owner have to repair a leaking low pressure appliance to below the leak rate threshold and get an initial verification test?
30 days
ODP stands for Ozone Depletion Potential which measures a substance's ability to:
Destroy ozone molecules in the stratosphere
For which refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFC’s, HCFC’s, and HFC’s?
A domestic refrigerator
When first inspecting a hermetic system known to be leaking, you should look for;
traces of oil.
What is the most effective way to leak test a charged low pressure chiller?
Use controlled hot water or electric heating blankets to increase system pressure
What can happen when a low pressure appliance has a leak at a fitting or gasket?
Air and moisture can enter the system
What do CFCs contain
Chlorine, fluorine, and carbon
When using a self-contained recovery device on a CFC, HCFC, or HFC system with an operating compressor, technicians must;
Either recover the refrigerant to 4 inches of mercury vacuum or 90% of the nameplate charge.
A cold storage warehouse chooses not to repair an appliance containing R-22 that is leaking above the threshold rate. How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply?
12 months
Why should a technician NEVER add nitrogen to a charged low pressure appliance for the purposes of leak detection?
It will cause the purge unit to operate resulting in refrigerant loss
When installing any type of access fitting onto a sealed system;
The fitting should be leak tested before proceeding with recovery.