2 Service Preparation and System Isolation Free Online FlashCards

What must be confirmed before beginning refrigeration service?

Identify the equipment, refrigerant, circuit, service history, and manufacturer’s instructions; confirm the technician’s qualifications and applicable requirements.

Which hazards should be assessed before service?

Consider electrical energy, pressure, hot or cold surfaces, refrigerant exposure, ventilation, and ignition hazards when relevant.

How should the service area be made safe?

Keep the area clear and accessible, provide suitable ventilation, control access, manage ignition sources when required, and wear task-appropriate protective equipment.

What must be checked when staging service tools?

Use equipment compatible with the refrigerant and rated for the pressures involved; inspect it for damage and confirm recovery equipment and cylinders are suitable.

What are the first steps in controlling hazardous energy?

Notify affected workers, shut down in an orderly manner, and identify every energy source that could cause startup or release energy.

What should isolate electrical power for service?

Use the designated disconnect or another energy-isolating device; a control switch alone is not sufficient.

What lockout/tagout protection should be applied?

Apply personal locks and tags as required by the employer’s energy-control procedure.

How should electrical isolation be verified?

Use the approved test method to prove that electrical isolation is effective.

What stored energy can remain after shutdown?

Account for stored energy such as capacitors, rotating parts, hot surfaces, and pressure trapped in refrigerant-circuit sections.

Why is a closed service valve not proof of safe conditions?

A closed valve does not prove downstream work is safe; leakage, bypass paths, or pressure reaccumulation may remain possible.

What evacuation condition applies before opening these appliances?

In relevant service circumstances, EPA requires evacuation to 0 psig before opening a high- or very-high-pressure appliance; follow the required recovery procedure and verify the section to be opened.

What does a reading of 0 psig not establish?

It is a gauge-pressure reading; it does not mean the system contains no refrigerant or that every isolated section is safe.