EPA 609 Refrigerant Recovery & Recycling 3

Question 1

After recovering refrigerant and completing repairs, what must be done before recharging the system?

Accepted Answer

Pull a deep vacuum to remove air and moisture

Answer

The system must be evacuated to a deep vacuum (typically 500 microns or less) to remove air and moisture before recharging.

Question 2

How long should a vacuum be held on an MVAC system during evacuation?

Accepted Answer

At least 30 minutes

Answer

A minimum 30-minute evacuation is recommended to ensure moisture is adequately removed from the system before recharging.

Question 3

What does a 'decay test' after evacuation check for?

Accepted Answer

Whether the system holds vacuum, indicating it is leak-free before recharging

Answer

A decay test involves closing the manifold valves after evacuation and watching for vacuum rise, which indicates a leak that must be repaired before charging.

Question 4

When recharging an MVAC system by weight, what is the most accurate method?

Accepted Answer

Using a calibrated electronic scale to measure the exact specified charge weight

Answer

Charging by weight using a calibrated scale is the most accurate method, ensuring the exact manufacturer-specified charge is added.

Question 5

Where can technicians find the correct refrigerant charge amount for a specific vehicle?

Accepted Answer

On the vehicle's A/C system specification label under the hood or in the service manual

Answer

Every vehicle has an A/C specification label (usually under the hood) listing the refrigerant type, charge amount, and oil type.

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 Refrigerant Recovery & Recycling 3