CHS C BANK

Never fill a refillable refrigerant cylinder beyond ________.

• A) 70% of its capacity by weight

• B) 70% of its capacity by volume

• C) 80% of its capacity by weight

• C) 80% of its capacity by volume

What makes HFC refrigerants damaging to the environment?

• A) They contain fluorine, which damages the ozone layer.

• B) They contain chlorine, which damages the ozone layer.

• C) They have a high ozone depletion potential (ODP).

• D) They can have very high global warming potentials.

When disposing of an appliance with 5-50 pounds of refrigerant, you must record ________.

• A) the type of refrigerant recovered

• B) the quantity of refrigerant, by type, recovered from the appliance during the past 12 months

• C) the quantity of refrigerant, by type, sent for reclamation or destruction

• D) all of the above

________ has the lowest ODP.

• A) R-11

• B) R-22

• C) R-410A

• D) R-502

The production and import of new R-22 in the U.S. to service existing systems is banned beginning in ________.

• A) 2019

• B) 2020

• C) 2023

• D) 2024

When transferring liquid in service hoses, you should guard against trapping ________.

• A) oil in the service hose

• B) oil in the manifold gauge set

• C) liquid refrigerant in the service hose between closed service valves

• D) refrigerant vapor in the service hoses between closed service valves

Always measure the final system vacuum ________.

• A) with the vacuum pump operating, gas ballast open, and micron gauge connected

• B) with the vacuum pump operating, gas ballast closed, and micron gauge connected

• C) with the system as warm as possible and the vacuum pump operating full speed

• D) with the system isolated from the vacuum pump

The ability of a substance to destroy ozone in the stratosphere is referred to as ________.

• A) GWP (global warming potential)

• B) ODP (ozone depletion potential)

• C) GOP (global ozone potential)

• D) GOE (global ozone extinction)

A system is evacuated ________.

• A) to find leaks

• B) to verify it is leak free

• C) to dehydrate the system

• D) all of the above

When a system using POE oil has been opened, what is the minimum evacuation level that should be achieved and held before charging the system?

• A) 28 in Hg

• B) 2000 microns

• C) 500 microns

• D) 500 in Hg