CFC System Charging & Evacuation 5

Question 1

When charging a system using the superheat method, which condition represents a correctly charged system?

Accepted Answer

Actual superheat equals target superheat from the manufacturer's charging chart

Answer

The superheat method is correct when measured suction superheat matches the target value from the manufacturer's or industry charging chart for the given conditions.

Question 2

What refrigerant handling practice is specifically prohibited by EPA Section 608 regulations?

Accepted Answer

Using refrigerant cylinders as a heat source to increase transfer speed

Answer

Applying heat directly to refrigerant cylinders is prohibited because it can raise internal pressure beyond the cylinder's rated capacity, creating an explosion hazard.

Question 3

A technician notices the micron gauge reading drops rapidly to below 200 microns but then slowly rises to 800 microns and stabilizes. This most likely indicates:

Accepted Answer

Residual moisture in the system that is outgassing

Answer

A rise that stabilizes after pump isolation indicates outgassing of moisture, which produces water vapor that raises the pressure to a level consistent with the dew point at that temperature.

Question 4

Which hose configuration maximizes evacuation speed when using a vacuum pump?

Accepted Answer

Large-diameter (3/8-inch core or larger) hoses connected directly to the system service valves

Answer

Large-diameter hoses connected directly to the system (bypassing the manifold if possible) minimize flow restriction and allow the vacuum pump to work at maximum efficiency.

Question 5

What must a technician do if a recovery cylinder's pressure relief valve opens during refrigerant recovery?

Accepted Answer

Stop recovery immediately, move the cylinder to a safe area, and do not reuse it without inspection

Answer

An opened pressure relief valve indicates the cylinder reached or exceeded its rated pressure; operations must stop and the cylinder must be inspected before further use.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC System Charging & Evacuation 5