Refrigerant should be recovered from the condenser outlet if the condenser is;
Below the receiver
When recovering refrigerant from a medium-pressure system with more than 200 lbs. of refrigerant, recover to a level of;
15” Hg
When using a recovery unit on a system containing 100 lbs. of R-410A it must be evacuated to;
0 inches of Mercury
A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to a level of;
0 inches of vacuum
A comfort cooling system that contains 50 pounds or more of R-410A is leaking. What will be the new maximum allowable annual leak rate starting in 2019?
10%
What can be done with a refrigerant trace gas and nitrogen mixture after a system leak is found?
Release to the atmosphere.
A new split system should be checked for leaks by;
pressurizing the system with a few ounces of system refrigerant and an inert gas.
Refrigerants CFC-12, HCFC-22, and HFC-134a are all classified as Type _______ substances.
A1
What happens to a refrigerant that is heated above the saturation temperature?
It remains in the vapor state.
EPA regulations require that all Industrial Process Refrigeration (IPR) systems containing more than 50 pounds of refrigerant MUST be repaired when the annual leak rate exceeds;
30%
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 internal pressure of 0 psig
What must the equipment owners/operators include in recovered refrigerant records for equipment with refrigerant charges that range from 5 to 50 pounds?
The quantity of refrigerant (by type) added or recovered from disposed appliances each year and quantity of refrigerant (by type) sent for reclamation or destruction.
Leaks must be repaired on industrial process and refrigeration units with a 50-pound charge or greater when the annualized leak rate reaches _____ or more.
30%
Non-condensable will cause;
High discharge pressure
A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under ASHRAE Standard;
15
Which of the following refrigerants is classified as a very high-pressure refrigerant?
R-744
When an appliance containing 50 pounds or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, what must be included on the leak inspections records?
Initial verification, verification tests and records of recovered refrigerant from equipment.
Unless plans are made to replace a system with a leak rate that exceeds the maximum leak rate, repairs must be made within;
30 Days
All HVAC/R systems must be protected by a;
Pressure relief valve
Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by;
EPA approved laboratory
A crankcase heater is often used to prevent refrigerant from mixing with compressor oil during periods of:
Low ambient temperature
EPA regulations state that removal of which component constitutes a “major repair”?
Compressor
When dehydrating a system, it should be evacuated to a minimum level of;
500 Microns
A high-pressure appliance containing 210 lbs. of R-407C refrigerant must be evacuated (recovered) to a level of;
0 inches of vacuum
