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
HVAC ESCO CORE
| Term | Definition |
|---|---|
| The layer of the Stratosphere that protects us from excessive Ultra Violet radiation is comprised of; | ozone |
| The molecule found in CFC's and HCFC's that depletes ozone is: | chlorine |
| Crop loss, eye disease, and skin cancer have been attributed to | depletion of stratospheric ozone |
| How many chlorine atoms does it take to destroy 1,000,000 ozone molecules | 10 |
| The chlorine in CFC's will; | not dissolve in water |
| HCFC's contain | hydrogen, chlorine, fluorine, carbon |
| Which of the following has the highest Ozone Depletion Potential? | cfcs |
| Technicians have been required to be certified to service, maintain, or dispose of appliances containing regulated refrigerants since. | November 14, 1994 |
| It has been a violation of EPA Section 608 regulations to vent CFC's or HCFC's since; | July 1, 1992 |
| It has been a violation of EPA Section 608 regulations to vent HFC's since | November 15, 1985 |
| Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal is the proper disposal method for | disposable cylinders |
| Which international agreement (Treaty) regulated the production and use of CFCs, HCFC's, halons, methyl chloroform and carbon tetrachloride? | Montreal Protocal |
| Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers, is the definition of | recycle |
| To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines | reclaiming |
| HFC's ________; | will not damage stratospheric ozone |
| When chlorine monoxide is found in the stratosphere, it indicates that | the ozone layer is being depleted |
| Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) | are odp substances |
| The two types of recovery systems are | system dependent and self contained |
| When a system is in full vacuum ____________ | never energize the compressor |
| The evaporator ___________________ | changes a low pressure liquid to a low pressure vapor |
| The condenser _______________________________________ | changes a high pressure vapor to a high pressure liquid |
| The metering device ______________________________ | changes a high pressure liquid to a low liquid |
| The compressor ____________________________________ | changes a low pressure vapor to a high pressure vapor |
| An ozone molecule contains | 3 oxygen atoms |
| Which type of refrigerant contains no chlorine? | HFCs |
| Technicians who perform sealed system service on small appliances must have; | type 1 or universal certification |
| A small appliance is defined by EPA as; | appliances manufactured, charged, and hermetically sealed in a factory with 5 lbs or less of refrigerant |
| Type I Certification is required for; | persons handling refrigerant during maintenance, service, or repair of small appliances |
| If regulations change after the technician becomes certified; | the technician is responsible with any future changes in the regulations |
| Recovery equipment manufactured after November 15, 1993 must be; | certified by an EPA testing laboratory |
| Which of the following is true of small appliances refrigerant leaks; | EPA does not require repair, but leaks should be repaired whenever possible |
| Recovery equipment manufactured after November 15, 1993 must be capable of recovering; | 90 % refrigerant or achieving 4 inches of vacuum if compressor works, 80 % and 4 inches vacuum if compressor doesn't work |
| Recovering multiple types of refrigerants in the same cylinder; | will make the reclaimed refrigerants non reclaimable and a charge for disposal may be levied |
| Self-contained or active recovery equipment; | has its own means of recovery |
| System-dependent or passive recovery equipment; | captures refrigerant into a non-pressurized container with assistance of the appliance compressor |
| What is defined as a non-condensible? | air |
| When using a system-dependent recovery system on an appliance that has an operating compressor, the technician should; | run the compressor and recover from the high side of the system |
| When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should; | place access fittings on both the low and high sides of the system |
| System-dependant devices may only be used on appliances containing; | 15 pounds of refrigerant or less |
| Small appliances are equipped with a straight piece of tubing (process stub) used to; | install a piercing type access valve fitting |
| If a strong odor is detected while performing the recovery process | a compressor burn out has likely occurred |
| After the refrigerant has been recovered, which of the following can be used to flush the system? | nitrogen |
| When filling a charging cylinder with a regulated refrigerant; | the refrigerant vapor that is vented off the top of the cylinder must be recovered |
| If after installing a fitting for the purpose of recovering the appliances refrigerant, you find that the system pressure is 0 psig; | recovery is not required |
| Applying heat with a heat gun to the compressor; | can help vaporize any trapped liquid refrigerant during recovery |
| Refrigerators in the 1950's and earlier may have used what refrigerants (recovery is not required)? | methyl formate, methyl chloride, or sulfer dioxide |
| Small appliances in recreational vehicles may use refrigerants such as Ammonia, Hydrogen, or water, and therefore; | the refrigerant should not be recovered |
| Recovery equipment manufactured before November 15, 1993 must be capable of recovering. | 80 percent of the refrigerant or achieving 4 inches of vacuum |
| When pressurizing a system with nitrogen you should; | charge through a pressure regulator, place a relief valve in the downstream line from the pressure regulator |
| After recovering refrigerant, the Nitrogen used to flush the system may be: | legally vented |
| Industrial process and refrigeration units with a 50 pound charge or more with an annualized leak rate of _____ or more must have leaks repaired. | 35 % |
| Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in; | 30 days |
| Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as; | Type A-1 |
| All Refrigeration & HVAC systems are protected by a; | pressure relief valve |
| A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms fall under; | ASHRAE Standard 15 |
| Non-condensables will cause; | high discharge pressure |
| A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of: | low ambient temperature |
| EPA regulations state that maintenance, service or repair involving the removal of the following component is a "major repair" | compressor |
| What refrigerant can be used as a trace gas when checking for leaks? | R-22 |
| What can be done with the refrigerant trace gas and nitrogen after the leak is found? | release into the atmosphere |
| High pressure appliances can be evacuated to atmospheric pressure (O psig) when; | there is a leak |
| 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; | 10 inches of vacuum |
| When dehydrating a system it should be evacuated to a level of; | 500 microns |
| When recovering from a system with a refrigerant leak, recover to a level of; | 0 psig |
| When using a recovery system manufactured after November 15, 1993 on a system containing 100 lbs. of R-502 must be evacuated to; | 10 inches of mercury |
| 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; | 4 inches of vacuum |
| What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level? | a system with a large leak and system pressure of atmospheric |
| A new split system should be checked for leaks by; | pressurizing the system with a few ounces of R-22 and an inert gas |
| An overcharged system will operate; | less efficiently |
| Refrigerant should be removed from the condenser outlet if the condenser is; | below the reciever |
| 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; | 35 % |
| Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by; | EPA approved laboratory |
| What happens to a refrigerant that is above the saturation temperature? | it remains in a vapor state |
| Which of the following refrigerant is considered high or very high pressure refrigerant? | HFC- 134 a |
| Air conditioning system short cycling is normally caused by; | the system being oversized for the home |
| What type of equipment can be worked on with Type III certification? | low pressure |
| The most efficient method of leak checking a charged low-pressure refrigeration unit is to | pressurize the system by the use of controlled hot water or heater blankets |
| When pressurizing a system, do not exceed | 10 psig |
| After reaching the required vacuum on an appliance when servicing, moisture is indicated by; | multiple rises in pressure over a period of time with increase of pauses between rises |
| EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 1993 is | 25 inches of HG |
| EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is | 25 mm HG absolute |
| What can be used to pressurize a chiller system before opening the system for a non-major repair? | controlled hot water |
| Refrigerant recovery from a system using R-11 or R-123 starts with | liquid removal and is followed by vapor recovery |
| If a strong odor is detected during the recovery process, | a compressor burn out may have occurred |
| When installing more than one pressure relief valves must be installed | in parallel |
| The owner must keep records of refrigerant added during service and maintenance on equipment | with charges of 50 lbs or greater |
| After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system | 100 lbs |
| When charging a system with a low pressure refrigerant should be introduced as a vapor to raise saturation temperature to a minimum of | 36 degrees |
| Where is the purge unit located in a low-pressure system? | the top of the condenser |
| In a chiller air and other noncondensables collect | at the top section of the condenser |
| A rupture disk for low pressure chiller will rupture at | 15 psig |
| The Standard for machine room safety is | ASHRAE - 15 |
| Who establishes the refrigerant safety group standard | ASHRAE |
| A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge. | 15 percent |
| ASHRAE 34 Standard Safety classifies R-134a as; | A1 |
| Because a low-pressure system operates below atmospheric pressure (in a vacuum) | leaks in the gaskets or fittings will cause air and moisture to enter the system |
| To repair a chiller operating with R-22 the technician; | must have a type II certification |
| Which of the following refrigerants has a safety classification of B-1 | HFC 123 ( R-123) |
| During evacuation of systems with large amounts of water, it may be necessary to; | increase pressure by introducing nitrogen to counteract freezing |
| When leak testing a low pressure chiller, the maximum pressure to use is; | 10 psig |
| All technicians must be certified to work on refrigeration systems and Sale of CFC and HCFC restricted to certified technicians | Nov 14, 1994 |
| Illegal to vent CFCs or HCFCs | Jul 1, 1992 |
| Illegal to vent HFCs | Nov 15, 1995 |
| Montreal Protocol | Mid 1989 |
| CFCs, halons, carbon tetrachloride, and methyl chloroform were phased out of production | Dec 31, 1995 |
| Recovery & recycling equipment must be EPA certified and labeled | Nov 15, 1993 |
| Recovery requirements were put in place under ARI 740 | Nov 15, 1993 |
Created by:
cvis
Popular Miscellaneous sets