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608 Type III
608 Type III and Universal
| Question | Answer |
|---|---|
| Who must get certified? | Anyone who will perform maintenance, service, or repair that it is reasonably expected to release CFC or HCFC into the atmosphere. |
| What are the types of certifications? | Type I, Type II, Type III and Universal |
| Does the EPA require recertification? | No, but it can change in the future |
| Who's responsibility is it to comply to any regulation changes? | The technician |
| Who is required to get Type III certification? | Anyone working on low pressure refrigerants |
| What are typical refrigerants used in low pressure refrigerants? | R-11, R-113, and R-123 |
| Who need to get the Universal Certification? | Anyone who is going to service all types of appliances |
| What is an appliance (Equipment) | It is any device which uses and contain class I or II substances or substitute refrigerant and is used for household or commercial purposes. |
| What does hydrostatic have to do with? | Pressure and equilibrium of water and other liquids. |
| Purge units are common on what? | Centrifugal chiller systems with operating pressures below 0 psig. |
| Purge units us what? | A compressor that is connected to the top of the condenser |
| What does a purge unit do? | Removes air and non-condesibles from the system, usually by distillation. |
| A purge unit does what with the refrigerant? | It returns refrigerant to the system's evaporator and expels air, non-condensibles, and some refrigerant. |
| What is a high efficiency purge unit? | A unit that discharges a lower percentage of refrigerant with the air. |
| What is a rupture disk? | A safety device used on sealed systems. It is designed to release refrigerant at a pre-set pressure. |
| Where should the pipe from the rupture disk be located? | Piped outside for venting. |
| Rupture Disks on chillers using low pressure refrigerant is normally located where? | On the evaporator and is usually set for 15psi |
| What does ASHRAE Guideline 3 for? | Reducing Emission of CFC Refrigerants in refrigeration and air conditioning equipment and applications. |
| What does ASHRAE Guideline 3 Section 7 Sub Section 7.2.3.1 state? | "If the system cannot hold a vacuum of 2500 microns (2.5 mm Hg) or less, it will be necessary to check for leaks..." |
| What does ASHARE Standard 15 state? | Refrigerants, machinery rooms shall be equipped with an equipment room refrigerant monitor and it shall actuate and alarm and start mechanical ventilation. Before refrigerant concentrations exceeds the TLV-TWA. |
| What does TLV-TWA stand for? | Threshold Limit Value - Time Weighted Average |
| What does ASHARE Standard 15 state about all refrigerant safety groups? | A refrigerant vapor detector shall be located from where a leak is most likely to concentrate and sound an alarm and start mechanical ventilation. |
| What does ASHRAE Standard 34 state? | Refrigerants are classified into safety groups based on toxicity and flammability. That there are six classifications. |
| What are the six classifications of the ASHRAE Standard 34? | A1, A2, A3, B1, B2, B3 |
| What does the A or B signify in the ASHRAE Standard 34? | The toxicity |
| What does the 1,2,or 3 signify in the ASHRAE Standard 34? | The flammability |
| When are Owners required to do repairs? | When there is substantial leaks in equipment with charges of greater than 50lbs. |
| When are industrial process and commercial refrigeration equipment required to do repairs? | If the Annual leak is 35% or greater. |
| When is comfort cooler chillers and any other equipment required to do repairs? | If the annual leak is 15% or greater. |
| What are the common sources of leaks? | Tubing connections and fittings, service valves, and shaft seal of an open compressor. |
| What could continuous excessive moisture collection in the purge unit indicate? | That the condenser or chiller barrel tubes are leaking. |
| What are common leak detection methods? | Visual inspection, halide torch, electronic or ultrasonic leak detector, soap bubble test, and pressure test. |
| How do you do a standing pressure test? | recover system refrigerant, add nitrogen or trace gas, and then bring system up to leak-finding pressure. |
| Should you ever use compressed air or oxygen to pressurize a system? | No, use dry nitrogen. |
| What psig should you never exceed in a low pressure system? | 10 psig |
| Should you use nitrogen or trace gas when checking a charge in a low pressure system? | No, instead raise the system pressure by using circulated hot water or a heat blanket. |
| What does it mean if the system will not hold a vacuum? | That there may be a leak present. |
| What does excessive running of the purge unit on a low pressure chiller mean? | Generally that indicates that the system is leaking. |
| What is indicated by a high head pressure? | Air in a low pressure system. |
| What is the important components of the refrigeration system? | Compressor, condenser, receiver, liquid line, metering device, evaporator, accumulator, and suction line. |
| What is the exception to evacuation requirements? | If, due to leaks, required evacuation level is not attainable, or would substantially contaminate refrigerant, evacuate to atmospheric pressure. |
| What should you do before evacuating and recovering refrigerant from a low pressure chiller? | Check the recovery unit's high pressure cut-out setting. Locate and connect the water source for the recovery unit's condenser coil. And if a chiller is suspected of having a tube leaks, drain the water sides of the condenser and evaporator. |
| During the recovery process, the use of a large vacuum pump could do what? | Cause the trapped water to freeze. |
| If the system contains a large amount of moisture what might be necessary? | To increase pressure by using nitrogen. |
| What should you make sure is circulating through the chiller during the evacuation and recovery? | Water |
| What should you use to remove ice from the sight glass? | Alcohol spray |
| What is the quickest method of recovery? | Recover liquid first and then recovery whatever vapor is left. |
| If oil has to be removed from the system what should you do? | Heat the system to approximately to 130 degrees F. |
| Why do you heat the oil? | It separates most of the refrigerant from the oil |
| What should be taken if the unit has had a compressor burnout? | An oil sample |
| How should you recharge a centrifugal chiller system? | Vapor first. |
| How do you prevent air accumulation into an idle low pressure refrigeration system? | The system pressure should be maintained slightly above atmospheric pressure. |
| What kind of containers always have to be used? | DOT approved |
| What are reusable cylinders sometimes called? | Returnable or refillable cylinders. |
| How often do reusable cylinders have to be safety tested? | Every 5 years. |
| What are disposable cylinders sometimes called? | One trip cylinders, or DOT 39 cylinders |
| What is the maximum capacity, when filling reusable refrigerant cylinders? | 80% capacity by weight |
| What are you looking for when you check cylinder integrity? | Free of dents, scrapes to bare metal, rust, or other damage. |
| Where should you return reusable cylinders to? | The manufacture. |
Created by:
DooleyDiesel