313D Safety and Regulations 3

Question 1

What does the ASHRAE Standard 15 primarily govern in HVAC applications?

Accepted Answer

Safety code for mechanical refrigeration systems

Answer

ASHRAE Standard 15 is the Safety Standard for Refrigeration Systems, covering safe design, construction, installation, and operation of refrigerating systems.

Question 2

Under the NEC, which article specifically addresses wiring methods and equipment for air conditioning and refrigerating equipment?

Accepted Answer

Article 440

Answer

NEC Article 440 covers air conditioning and refrigerating equipment, including motor circuits and overcurrent protection requirements specific to hermetic refrigerant motor compressors.

Question 3

A residential split system's outdoor disconnect must be located within sight of and within how many feet of the equipment?

Accepted Answer

50 feet

Answer

The NEC requires the disconnecting means to be within sight of and within 50 feet of the air conditioning equipment it serves.

Question 4

Which refrigerant classification under ASHRAE 34 indicates the highest flammability level?

Accepted Answer

Class 3

Answer

ASHRAE 34 Class 3 refrigerants are highly flammable, with a flame propagation rate greater than 10 cm/s and heat of combustion ≥19 kJ/g.

Question 5

What is the purpose of a relief valve on a refrigerant receiver or storage tank?

Accepted Answer

To vent refrigerant when pressure exceeds safe limits

Answer

Relief valves are safety devices that open to release refrigerant when pressure exceeds a preset limit, preventing vessel rupture.

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

313D Safety and Regulations 3