Term
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Definition
| Technicians maintaining, servicing, repairing or disposing of high pressure or very high‐pressure appliances. |
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Term
| After the installation of any type of system, the unit should first be... |
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Definition
| pressurized with nitrogen (an inert gas) and leak checked. |
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Term
| In order to determine the general area of a leak use an... |
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Definition
| electronic or ultrasonic leak detector. |
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Term
| Once the general area of the leak is located the use of... |
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Definition
| soap bubbles will pinpoint the leak. |
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Term
| A refrigeration unit using an open compressor that has not been used in several months is likely to leak from... |
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Definition
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Term
| During an inspection of a high pressure system, traces of... are an indicator of a refrigerant leak. |
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Definition
| oil or excessive superheat |
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Term
| EPA regulations require that all comfort cooling appliances containing more than 50 lbs. of refrigerant MUST be re‐ paired when the annual leak rate exceeds... |
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Definition
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Term
| EPA regulations require that all Commercial and Industrial Process Refrigeration containing more than 50 lbs. of re‐ frigerant MUST be repaired when the annual leak rate exceeds... |
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Definition
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Term
| Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by an... |
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Definition
| EPA approved laboratory (UL or ETL) to meet or exceed ARI standards. |
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Term
| Recovered refrigerants may contain acids, moisture, and oil. It is therefore necessary to... |
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Definition
| frequently check and change both the oil and filter on a recycling machine. |
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Term
| Both recycling and recovery equipment using hermetic compressors have the potential to... |
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Definition
| overheat when drawing a deep vacuum because the unit relies on the flow of refrigerant through the compressor for cooling. |
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Term
| Before using a recovery unit you should always... |
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Definition
| check the service valve positions, the oil level of the recovery unit, and evacuate and recover any remaining refrigerant from the unit’s receiver. |
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Term
| Refrigerant Recovery and/or Recycling equipment manufactured after... must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards. |
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Definition
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Term
| After reaching the desired vacuum, the technician should wait a few minutes to see if... |
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Definition
| the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil. |
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Term
| Appliances can be evacuated to atmospheric pressure (O psig) if... |
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Definition
| leaks make evacuation to the prescribed level unattainable. |
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Term
| Recovery level for HCFC-22 appliances or isolated components of such appliances normally containing less than 200 lbs. of refrigerant. |
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Definition
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Term
| Recovery level for HCFC-22 appliances or isolated components of such appliances normally containing more than 200 lbs. of refrigerant. |
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Definition
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Term
| Recovery level for other high pressure appliances or isolated component of such appliance normally containing less than 200 lbs. of refrigerant. |
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Definition
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Term
| Recovery level for other high pressure appliances or isolated component of such appliance normally containing more than 200 lbs. of refrigerant. |
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Definition
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Term
| Recovery level for very high pressure appliances. |
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Definition
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Term
| Under EPA regulations, a “major repair” means any maintenance, service or repair involving the removal of any or all of the following components: |
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Definition
| the compressor, the condenser, the evaporator or an auxiliary heat ex‐ changer coil. |
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Term
| For many years, the most common refrigerant used in residential split air conditioning systems was R‐22, but with the current changes in the industry... |
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Definition
| read the nameplate to determine the type of refrigerant used. |
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Term
| If a strong odor is detected during the recovery process, a... |
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Definition
| compressor burn‐out may have occurred. |
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Term
| A... is often used to prevent refrigerant from migrating to the oil during periods of low ambient temperature. |
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Definition
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Term
| When evacuating a vapor compression system, the vacuum pump should be capable of pulling... of vacuum. |
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Definition
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Term
| A... could be damaged if energized when under a deep vacuum. |
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Definition
| hermetic compressor's motor winding |
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Term
| During evacuation of systems with large amounts of water, it may be necessary to... |
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Definition
| increase pressure by introducing nitrogen to counteract freezing. |
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Term
| The source of most non‐condensables is... |
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Definition
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Term
| Non‐condensables will cause... |
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Definition
| higher discharge pressures. |
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Term
| Refrigerants CFC‐12, CFC‐11, and HFC‐134a are categorized as... |
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Definition
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Term
| All refrigeration systems must be protected by a |
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Definition
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Term
| NEVER energize... if the discharge service valve is closed. |
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Definition
| a reciprocating compressor |
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Term
| Industrial process and refrigeration units with a 50 pound charge or more with an annualized leak rate of _____ or more must have leaks repaired. |
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Definition
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Term
| Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in; |
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Definition
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Term
| Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as; |
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Definition
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Term
| All Refrigeration & HVAC systems are protected by a; |
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Definition
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Term
| A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms fall under; |
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Definition
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Term
| Non-condensables will cause; |
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Definition
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Term
| A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of: |
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Definition
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Term
| EPA regulations state that maintenance, service or repair involving the removal of the following component is a "major repair" |
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Definition
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Term
| What refrigerant can be used as a trace gas when checking for leaks? |
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Definition
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Term
| What can be done with the refrigerant trace gas and nitrogen after the leak is found? |
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Definition
| release into the atmosphere |
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Term
| High pressure appliances can be evacuated to atmospheric pressure (O psig) when; |
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Definition
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Term
| If a high pressure appliance containing 100 lbs. of an HCFC OTHER THAN R-22 refrigerant Recovery and/or Recycling equipment manufactured after November 15, 1993 must be evacuated to a level of; |
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Definition
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Term
| When dehydrating a system it should be evacuated to a level of; |
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Definition
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Term
| When recovering from a system with a refrigerant leak, recover to a level of; |
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Definition
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Term
| When using a recovery system manufactured after November 15, 1993 on a system containing 100 lbs. of R-502 must be evacuated to; |
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Definition
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Term
| If a high pressure appliance containing 210 lbs. of R-22 refrigerant Recovery and/or Recycling equipment manufactured before November 15, 1993 must be evacuated to a level of; |
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Definition
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Term
| What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level? |
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Definition
| a system with a large leak and system pressure of atmospheric |
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Term
| A new split system should be checked for leaks by; |
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Definition
| pressurizing the system with a few ounces of R-22 and an inert gas |
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Term
| An overcharged system will operate; |
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Definition
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Term
| Refrigerant should be removed from the condenser outlet if the condenser is; |
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Definition
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Term
| EPA regulations require that all Commercial and Industrial Process Refrigeration containing more than 50lbs. of refrigerant MUST be repaired when the annual leak rate exceeds; |
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Definition
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Term
| Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by; |
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Definition
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Term
| What happens to a refrigerant that is above the saturation temperature? |
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Definition
| it remains in a vapor state |
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Term
| Which of the following refrigerant is considered high or very high pressure refrigerant? |
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Definition
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Term
| Air conditioning system short cycling is normally caused by; |
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Definition
| the system being oversized for the home |
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