Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
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