Core 1
The AIM Act will phasedown production and importation of
HFCs
A refrigerant this is in a mixed state (liquid and vapor) is said to be
saturated
Most, if not all, 2L refrigerants still fall under the jurisdiction of
EPA Section 608
A2L systems are designed with electrical components that are __________.
intrinsically safe (IS)
Flammable refrigerants will only be used in
New Equipment
Vapor line temperature – Low side saturation temperature =
Superheat
DOT regulations require refrigerant cylinders containing over 2.2 lbs. of a A2L refrigerant to be equipped with a ____________ instead of a rupture disc.
pressure relief valve
When performing repairs on a system that is charged with an A2L refrigerant, discharge capacitors with a ______.
resistor
Tools used during the installation or service of systems charged with a flammable refrigerant must be
rated for use with flammable refrigerants.
High side saturation temperature – Liquid line temperature =
Subcooling
OSHA requires that if flammable refrigerant cylinders are to be stored in an enclosure, the enclosure be
secure and ventilated
After recovery of an A2L refrigerant, the system should be ______________________.
purged with dry nitrogen (nitrogen sweep)
Due to their impact on the environment, most refrigerants are now regulated by either the
EPA, state laws, or both.
The industry standard target for evacuation is
500 microns (29.98 inHg)
When installing or service a system that is charged with a flammable refrigerant, always keep a Class __________, fire extinguisher on the jobsite
B, dry-powder
Empty flammable refrigerant cylinders should be punctured with a
non-sparking pick
Refrigerant cylinders should be stored at temperatures under
125°F
When using an A2L, A2, or an A3 as a refrigerant trace gas, the amount must not exceed _____ of the lower flammability level (LFL) for the refrigerant as listed in ASHRAE Standard 34
25%
_____________ are designed and installed to prevent accumulation and/or ignition of flammable refrigerant vapors should a leak occur
Mitigation strategies
For A2L-charged systems, the maximum allowable charge is not
a universal figure