A2L Calculating Maximum Refrigerant Charge Limits 2

Question 1

What standard provides the methodology for calculating maximum refrigerant charge limits for A2L refrigerants?

Accepted Answer

ASHRAE 15 and UL 60335-2-40

Answer

EPA Section 608

Answer

OSHA 29 CFR 1910

Answer

DOT 49 CFR

Question 2

The Refrigerant Concentration Limit (RCL) is based on which property of the refrigerant?

Accepted Answer

The lower of the flammability limit or the acute toxicity exposure limit

Answer

Boiling point

Answer

Color and odor

Answer

Pressure at room temperature

Question 3

A room measures 4m × 5m × 2.5m. The RCL for the A2L refrigerant being used is 0.061 kg/m³. What is the maximum allowable charge?

Accepted Answer

3.05 kg

Answer

1.53 kg

Answer

6.10 kg

Answer

50 kg

Question 4

When calculating charge limits, which room measurement should be used?

Accepted Answer

The smallest occupied space where a refrigerant leak could accumulate

Answer

The largest room in the building

Answer

The average room size

Answer

Only rooms with HVAC equipment

Question 5

How does the installation height of an indoor unit affect the charge limit calculation for A2L refrigerants?

Accepted Answer

Higher installation may allow larger charges because A2L refrigerants are heavier than air and settle at floor level

Answer

Height has no effect on charge limits

Answer

Lower installation always increases the charge limit

Answer

Only ceiling-mounted units are affected

Question 6

What happens if the calculated maximum charge exceeds the system's design charge requirement?

Accepted Answer

Consider a different refrigerant, a different system design, or install mitigation measures like leak detection with ventilation

Answer

Use the refrigerant anyway

Answer

Increase the room size

Answer

Override the calculation with supervisor approval