RSES Safety Procedures 3

Question 1

What is the purpose of a lockout/tagout (LOTO) procedure when servicing refrigeration equipment?

Accepted Answer

To ensure hazardous energy is isolated before work begins so equipment cannot be accidentally energized

Answer

LOTO procedures isolate all hazardous energy sources—electrical, mechanical, pneumatic—before service begins, preventing accidental startup that could injure technicians.

Question 2

When recovering refrigerant from a system, the recovery cylinder should NEVER exceed what percentage of its listed water capacity by weight?

Accepted Answer

80%

Answer

DOT regulations require recovery cylinders to be filled to no more than 80% of their water capacity by weight to allow for liquid expansion and prevent overpressure.

Question 3

Which type of fire extinguisher is appropriate for an electrical fire involving a refrigeration system's control panel?

Accepted Answer

Class C CO2 or dry chemical extinguisher

Answer

Class C extinguishers (CO2 or dry chemical) are non-conductive and safe for use on energized electrical equipment; water or foam would create electrocution hazards.

Question 4

A technician is about to perform a nitrogen pressure test on a newly assembled refrigerant circuit. What critical safety device must be installed before pressurizing?

Accepted Answer

A pressure relief valve or safety valve rated for the test pressure

Answer

A pressure relief valve must be installed before any pressure test to prevent catastrophic failure if the circuit is over-pressurized during the test.

Question 5

R-410A refrigerant systems operate at significantly higher pressures than R-22 systems. What is the primary safety implication for technicians?

Accepted Answer

All hoses, gauges, and fittings used must be rated for the higher operating pressures

Answer

R-410A systems operate at approximately 60% higher pressures than R-22; all service tools and fittings must be rated for these pressures to prevent equipment failure and injury.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Safety Procedures 3