TYPE I
The EPA definition of a small appliance includes products manufactured, fully charged, and hermetically sealed in a factory containing these many pounds
What are 5 pounds or less?
Technicians maintaining, servicing, repairing or disposing of medium, high, or very high-pressure appliances, except small appliances and motor vehicle air-conditioning systems, must be certified as a
What is Type II or Universal
Because a low-pressure system operates below atmospheric pressure (in a vacuum), leaks in the gaskets or fittings will cause this
What are air and moisture to enter the system.
The owner or operator has 18 months to retrofit or retire a leaking appliance if the replacement appliance uses these types of refrigerants
What are refrigerants exempt from the venting?
If non-condensables, such as air or dry-nitrogen, remain in a refrigeration system, the discharge pressure of the system will be
What is higher?
When retrofitting or converting a system to use a different refrigerant, only this EPA group can approve substitutes can be use. Since there are no such thing as drop-in substitutes.
What is SNAP?
The maximum leak rate for comfort cooling, commercial refrigeration, and industrial.
What are 10% for comfort cooling, 20% for commercial refrigeration, 30% industrial process refrigeration?
This ASHRAE Standard also requires the use of room sensors and alarms to detect refrigerant leaks in all refrigerant safety groups.
What is ASHRAE Standard 15
P.S
R-123 refrigerant is classified as B1 (non-flammable, high toxicity).
Refrigerant R-1233zd is classified A1(non-flammable, low toxicity
under ASHRAE Standard 34
If an appliance with a charge of 200 pounds or more of a regulated refrigerant passes the initial verification leak test, a follow-up verification test must be conducted within these many days
What is 10 days?
This is typically used on small appliances is a straight piece of tubing that is entered using a piercing access valve to add or remove refrigerant from a small appliance.
What is a process stub?
Recovery equipment used during the maintenance, service, or repair of small appliances that use CFCs, HCFCs, and HFCs must be certified by
Compressor replacement, as well as the replacement of an evaporator coil, condenser coil, or other system heat exchanger, is considered to be this according to the epa
What is a major repair?
TRUE OR FALSE: The liquid refrigerant is charged into the system using the evaporator charging valve, which is the lowest access point on a low-pressure appliance.
What is True?
When using a self-contained (active) recovery device and there is a large volume of non-condensable gas in the refrigerant being recovered, , excessive pressure can occur on this side of the recovery machine and in the recovery cylinder
What is the High side?
Due to the volume of liquid refrigerant in large systems, refrigerant removal from a low-pressure system should be done with this refrigerant state followed by the recovery of refrigerant state
TRUE OR FALSE:R-744, carbon dioxide, is a very high-pressure refrigerant and generally does not need to be recovered.
What is true?
Before making a major repair to an R-410A system that contains more than 200 pounds of refrigerant, the technician must evacuate the appliance to a vacuum level of at least this
!0 inches of HG vacuum
Before disposing of a low-pressure appliance, the refrigerant must be recovered or evacuated to this many mm of Hg absolute
A 15psig rated rupture disc is located on this part of a centrifugal chiller
What is the evaporator?
If, after repairing a leak in an HCFC rack refrigeration system used in a supermarket, the system fails the initial leak verification test, the technician has this man days to make additional repairs or develop a retrofit plan.
What is 30 days?
At high temperatures, CFC and HCFC refrigerants can decompose into this gas and/or acids
What is phosgene gas, hydrochloric acid, and hydrofluoric acid?
If an appliance with 50 or more pounds of a regulated refrigerant has exceeded the threshold leak rate, the equipment owner or operator has this many days to repair the appliance so that it leaks below the threshold limit and conduct the initial verification test, unless EPA grants additional time
What is 30 days?
When making a non-major repair, warming the liquid refrigerant in the system with these will bring the system pressure out of a vacuum
What are using hot water or warming blankets?
The high-pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low-pressure chiller is typically set to this psig
What is 10psig?
If a chiller with a charge of 200 pounds of an ozone-depleting refrigerant has passed the initial verification leak test, a follow-up verification test must be conducted within these many days
What is 10 days?
R-290,R-441A and R-600a are approved refrigerants of this type of refrigerant
What is HC? (Hydrocarbon)
P.S these are not approved for retrofits in existing HFC refrigerants
To help prevent compressor damage, refrigerant systems must be protected by this device which may be in the compressor or external relief valve. Also, these must be installed in parallel if there are multiple.
What is a high-pressure relief device?
The discharge from a rupture disc or pressure relief valves should be piped there to prevent venting into the machine room.
What is outside?
If an appliance with 50 or more pounds of a regulated refrigerant charge has exceeded the threshold leak rate, the owner or operator has these many months to retrofit or retire the appliance,
What is 18 months?
A hydrostatic tube test kit is used to determine what
What is if a tube is leaking?
P.S Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause the rupture disc, which typically bursts at 15 psig, to fail.