Rules and procedures for servicing low-pressure chillers, tested on the Type III certification.
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- What is a low-pressure appliance under EPA 608 Type III?
- An appliance designed to operate with refrigerant pressures normally below 10 psig, typically a low-pressure chiller.
- What is the most common refrigerant used in Type III low-pressure chillers?
- CFC-11 (trichlorofluoromethane), historically the standard for low-pressure chillers.
- What is the purpose of a liquid indicator glass in a low-pressure system?
- To visually observe refrigerant level and detect moisture by color changes.
- What is the function of a purge unit in a low-pressure chiller?
- To remove non-condensable gases and moisture that accumulate in the system over time.
- How must refrigerant be recovered from a low-pressure appliance?
- By using a certified recovery system with adequate storage capacity, never vented to atmosphere.
- What is the maximum moisture content allowable in a low-pressure chiller system?
- 15 parts per million (ppm) by weight.
- What pressure relief device protection is required for low-pressure chillers?
- At least one pressure relief valve set to relieve at the maximum allowable working pressure.
- What acid test is required after opening a Type III system?
- An acid number test (ASTM D664) to detect acid formation, max 0.1 mg KOH/g.
- How should lines be protected after opening a Type III system?
- All open lines must be capped or plugged immediately to prevent moisture and air entry.
- What leak detection method is prohibited on low-pressure chillers?
- Pressurizing the system with air or oxygen to search for leaks.
- What type of expansion device is used in low-pressure chillers?
- Thermostatic expansion valve (TXV) or capillary tube, not orifice plates.
- How is the compressor motor cooled in a low-pressure chiller?
- By direct contact with the low-pressure refrigerant vapor, which provides motor cooling.
- What is the cylinder color code for CFC-11 refrigerant?
- Green (or white for recovery cylinders containing CFC-11).
- What EPA violation carries the highest penalty for improper venting?
- Venting CFC or HCFC refrigerant intentionally; penalties exceed $40,000 per violation.
- What must be documented on a service record for Type III systems?
- Refrigerant added, amount recovered, compressor status, oil condition, and acid test results.
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