RSES Safety Procedures 4

Question 1

An ammonia (R-717) refrigeration system develops a large leak in a machinery room. What is the FIRST action the technician on site should take?

Accepted Answer

Activate the emergency shutdown, evacuate personnel, and alert emergency services

Answer

Ammonia is toxic and immediately dangerous to life at 300 ppm; emergency shutdown, evacuation, and contacting emergency services are the immediate priorities.

Question 2

What is the significance of the ASHRAE 15 standard for refrigeration safety?

Accepted Answer

It establishes safety requirements for refrigerating systems including machinery room design and refrigerant limits

Answer

ASHRAE Standard 15 covers safety requirements for refrigerating systems including machinery room ventilation, occupancy classification, refrigerant quantity limits, and equipment requirements.

Question 3

Why should a technician NEVER use oxygen or compressed air to pressure test a refrigeration system?

Accepted Answer

Oxygen mixed with refrigerant oil can create a flammable or explosive mixture

Answer

Oxygen mixed with compressor oil creates a potentially explosive combination, and compressed air introduces moisture; only dry nitrogen is safe for pressure testing refrigerant systems.

Question 4

According to EPA Section 608 regulations, which refrigerants are subject to mandatory recovery requirements before servicing equipment?

Accepted Answer

All refrigerants regulated under Clean Air Act Section 608, including CFCs, HCFCs, and HFCs

Answer

EPA Section 608 regulations require recovery of all regulated refrigerants—CFCs, HCFCs, and HFCs—from appliances before service, maintenance, or disposal.

Question 5

A refrigeration system shows extremely high discharge pressure but normal suction pressure. What safety risk does this present to the technician?

Accepted Answer

Risk of high-side component rupture from overpressure, potentially causing projectile hazards

Answer

Abnormally high discharge pressure can exceed the design limits of high-side components, risking rupture of fittings, hoses, or vessels and creating dangerous projectile or spray hazards.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Safety Procedures 4