Safety Procedures Flashcards
7 cards from real RSES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety Procedures flashcards as text
When using a manifold gauge set on a refrigeration system, what is the correct procedure before connecting to the system?
Answer: Purge the gauge hoses with refrigerant to remove air and moisture
Purging gauge hoses removes air and moisture that could contaminate the refrigerant system or give inaccurate readings.
What is the minimum recommended safety relief valve setting for a high-pressure refrigerant system using R-22?
Answer: 350 psig
ASHRAE and safety codes require relief valves on R-22 high-side equipment to be set at no more than the maximum allowable working pressure, typically 350 psig for R-22 high-side components.
A technician discovers refrigerant oil on the floor near a refrigeration unit. What is the FIRST safety action to take?
Answer: Identify and eliminate any ignition sources in the area
Oil on the floor near refrigeration equipment can create slip hazards and may contain refrigerant; eliminating ignition sources is the first priority if flammable refrigerants are involved.
Which color-coded cylinder should NEVER be refilled and is intended for single use only?
Answer: Disposable small cylinders with a non-refillable valve
Disposable refrigerant cylinders are designed for single use and are illegal to refill; they are identified by their non-refillable valves.
What does a pressure-enthalpy diagram primarily help a refrigeration technician determine regarding safety?
Answer: Whether system pressures are within safe operating limits for the refrigerant
A pressure-enthalpy diagram shows saturation curves and operating conditions, helping technicians verify that system pressures stay within safe limits for the specific refrigerant.
When brazing refrigerant lines, what gas must flow through the tubing to prevent oxide scale formation and reduce fire risk?
Answer: Dry nitrogen at a low positive pressure
Dry nitrogen purged through tubing during brazing prevents internal oxidation scale and keeps flammable refrigerant vapors purged from the work area.
A technician is working in a confined mechanical room where refrigerant concentration may be elevated. Which symptom indicates that the oxygen level may be dangerously low?
Answer: Dizziness, rapid breathing, and impaired judgment
Dizziness, rapid breathing, and impaired judgment are early symptoms of oxygen displacement (hypoxia) caused by refrigerant or other gases displacing oxygen in a confined space.