608 Type III and Universal
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Who must get certified? | show 🗑
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| What are the types of certifications? | show 🗑
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| Does the EPA require recertification? | show 🗑
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| Who's responsibility is it to comply to any regulation changes? | show 🗑
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| show | Anyone working on low pressure refrigerants
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| What are typical refrigerants used in low pressure refrigerants? | show 🗑
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| show | Anyone who is going to service all types of appliances
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| What is an appliance (Equipment) | show 🗑
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| show | Pressure and equilibrium of water and other liquids.
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| Purge units are common on what? | show 🗑
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| show | A compressor that is connected to the top of the condenser
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| What does a purge unit do? | show 🗑
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| show | It returns refrigerant to the system's evaporator and expels air, non-condensibles, and some refrigerant.
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| What is a high efficiency purge unit? | show 🗑
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| What is a rupture disk? | show 🗑
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| show | Piped outside for venting.
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| show | On the evaporator and is usually set for 15psi
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| show | Reducing Emission of CFC Refrigerants in refrigeration and air conditioning equipment and applications.
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| show | "If the system cannot hold a vacuum of 2500 microns (2.5 mm Hg) or less, it will be necessary to check for leaks..."
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| show | 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.
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| What does TLV-TWA stand for? | show 🗑
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| What does ASHARE Standard 15 state about all refrigerant safety groups? | show 🗑
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| What does ASHRAE Standard 34 state? | show 🗑
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| What are the six classifications of the ASHRAE Standard 34? | show 🗑
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| show | The toxicity
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| show | The flammability
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| show | When there is substantial leaks in equipment with charges of greater than 50lbs.
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| When are industrial process and commercial refrigeration equipment required to do repairs? | show 🗑
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| show | If the annual leak is 15% or greater.
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| show | Tubing connections and fittings, service valves, and shaft seal of an open compressor.
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| show | That the condenser or chiller barrel tubes are leaking.
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| What are common leak detection methods? | show 🗑
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| show | recover system refrigerant, add nitrogen or trace gas, and then bring system up to leak-finding pressure.
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| show | No, use dry nitrogen.
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| What psig should you never exceed in a low pressure system? | show 🗑
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| show | No, instead raise the system pressure by using circulated hot water or a heat blanket.
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| show | That there may be a leak present.
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| What does excessive running of the purge unit on a low pressure chiller mean? | show 🗑
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| What is indicated by a high head pressure? | show 🗑
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| show | Compressor, condenser, receiver, liquid line, metering device, evaporator, accumulator, and suction line.
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| What is the exception to evacuation requirements? | show 🗑
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| What should you do before evacuating and recovering refrigerant from a low pressure chiller? | show 🗑
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| During the recovery process, the use of a large vacuum pump could do what? | show 🗑
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| If the system contains a large amount of moisture what might be necessary? | show 🗑
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| show | Water
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| What should you use to remove ice from the sight glass? | show 🗑
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| show | Recover liquid first and then recovery whatever vapor is left.
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| If oil has to be removed from the system what should you do? | show 🗑
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| Why do you heat the oil? | show 🗑
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| show | An oil sample
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| How should you recharge a centrifugal chiller system? | show 🗑
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| show | The system pressure should be maintained slightly above atmospheric pressure.
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| What kind of containers always have to be used? | show 🗑
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| show | Returnable or refillable cylinders.
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| show | Every 5 years.
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| show | One trip cylinders, or DOT 39 cylinders
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| show | 80% capacity by weight
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| show | Free of dents, scrapes to bare metal, rust, or other damage.
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| Where should you return reusable cylinders to? | show 🗑
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