Term
| As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere? |
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Definition
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Term
| Which refrigerant is a CFC? |
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Definition
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Term
| Which refrigerants are HCFC |
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Definition
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Term
| The molecule in the stratosphere tht showes stratospheric ozone depletion is taking place is |
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Definition
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Term
| One time disposable refrigerant cylinders are used for |
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Definition
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Term
| the time to evacuate and dehydrate a system before charging with refrigerant is determined by |
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Definition
total volume of the system
amount of non condensibles in system
ambient temperature |
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Term
| a system that fails to hold a vacuum after the evacuation process |
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Definition
may contain moisture
may have a leak |
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Term
| What does recover refrigerant mean? |
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Definition
| remove refrigerant from a system and store it in a container without necessarily testing or processing. |
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Term
| process that reduces contaminants in used refrigerant by oil separation wiht single and multiple passes through devices such as replaceable filter core driers is |
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Definition
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Term
| What lubricant is used with HCFD based ternary blends |
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Definition
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Term
| What is the refrigerant condition and state entering the concenser of and AC |
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Definition
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Term
| The condition and state of the refrigerant leaving a receiver is |
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Definition
| super cooled liquid...and remembera TXV metering device has a receiver receiver is located in the liquid like directly following the condenser |
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Term
| the part of AC that changes a low presure vapor to a high pressure vapor is |
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Definition
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Term
| For work on small appliances, recovery equipment manufactured after what date must be certified by an EPA approved organization? |
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Definition
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Term
| For small appliances the recovery equipment manufactured after November 15,1993 must be capable of recovering |
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Definition
80 % of R with out running a compressor
90 % of R with a compressor running
and both can also be "or" achieve a 4 inch vacuum undr ARI 740-1993 |
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Term
| The sale of class 1 and class 11 refrigerants are restricted to certified techs after |
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Definition
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Term
| R 134 container are what color? |
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Definition
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Term
| hydrochloric and hydrofluoric acids are |
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Definition
| Caused from CFC or HCFC in presence of moisture being exposed to high heat; damagint to windings in hermetic refrigerations and AC; Not be handled with bare hands; |
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Term
| Systems operating with a complete restriction at capillary tube inlet what access is required for recovery? |
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Definition
| One access on high side of system |
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Term
| CFC are not manufacture after |
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Definition
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Term
| Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen? |
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Definition
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Term
| excessive super heat at the evaporator outlet and compressor inlet of an AC may be an indication of what? |
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Definition
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Term
| what are some indications of a low charge? |
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Definition
| excessive superheat at evaporator outlet and com[ressor inlet |
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Term
| Type 2 classification applies to |
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Definition
high or very high pressure equipment.
with more than 5 pounds of refrigerant. |
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Term
| Front seating the three-way suctin service valve will close what |
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Definition
| The suction inlet to the valve...and never start a compressor with it front seated (closed) |
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Term
| The required level of evacuation or recovery equipment manufactured before November 15, 1993 on a system with R 22 charge of less than 200 pounds |
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Definition
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Term
| The required level of evacuation or recovery equipment manufactured after November 15, 1993 on a system with R 22 charge of less than 200 pounds |
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Definition
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Term
| The required level of evacuation or recovery equipment manufactured after November 15, 1993 on a system with R 12 charge of less than 200 pounds |
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Definition
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Term
| Industrial process and commercial refrigeration equipment wiht an annual leak rate of ? requires repair |
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Definition
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Term
| Comfort cooling with and annual leak rate of ? requires repair |
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Definition
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Term
| How can recovery time be shortened? |
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Definition
recovering as much liquid as possible in initial stages
using short hoses
cooling the recovery tank in ice water |
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Term
| The majority of the liquid to be recovered wil be found in the |
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Definition
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Term
| The owner must maintain records of R added to units that contain more than how much R charge? |
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Definition
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Term
| The exception to required evacuation levels |
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Definition
| filled with water or things that would damage the recovery equipment..like in refrigerator made before 1950 |
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Term
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Definition
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Term
| split air conditioning swystems manufactured before 1995 usually contain which refrigerant? |
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Definition
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Term
| refrigerant entering the receiver is |
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Definition
| subcooled high presssure liquid |
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Term
| refrigerant leaving the accumulator is |
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Definition
| superheated low pressure vapor |
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Term
| deep vacuums used for evacuation and dehydration of systems are measured in |
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Definition
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Term
| non condensibles in systems will |
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Definition
| tend to stay on top of the condenser: increase the high side pressure; be purged with a recovery machine |
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Term
| Which refrigerant is a CFC and has been used with low pressure appliances |
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Definition
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Term
| A short term replacement refrigerant for R 11 chiller is |
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Definition
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Term
| Water tube leaks in a low pressure chiller are found with |
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Definition
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Term
| the required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured before november 15, 1993 is |
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Definition
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Term
| the required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured after november 15, 1993 is |
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Definition
| 25 mmm Hg aabsolute or 29 inches of Hg (same thing |
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Term
| To prevent freezing of water coils of a low pressure chiler do what? |
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Definition
Start in vapor phase
circulate water through the chiller
do not inject liquid until saturation temp is above 32 |
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Term
| Under ASHRAE standard 15 what refrigerant requires equipment room sensors? |
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Definition
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Term
| what require equipment room oxygen deprivations sensors |
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Definition
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Term
| the pruge unit draws from |
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Definition
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Term
| machine room safety standards set by |
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Definition
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Term
| Vapor is charged into a low pressure chiller initially to prevent |
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Definition
| water freeze up caused by system vacuum |
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Term
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Definition
| Oxygen depleting Class 1 and II substances and heavier than iair |
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Term
| what are some CFC refrigerants |
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Definition
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Term
| what is a HCFC refrigerant? |
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Definition
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