I NEED TO KNOW THIS
What refrigerants make up HCFC?
Hydrogen, Chlorine, Fluorine, Carbon
What type of appliances are technicians certified the charge and open after pass the Type 1 examination?
Appliances containing 5 LBS. of refrigerant or less, hermetically sealed, factory charged
When first inspecting a hermetic system known to be leaking, you should look for?
Oil
A chiller classified as comfort cooling that contains 50 LBS or more of refrigerant has what leak rate, as per EPA starting in 2019?
10 %
What type of hoses should be equipped when performing refrigerant recovery?
Low Loss Fitting
Ball valve
What is one of the most serious results of damage to the stratospheric ozone layer?
Increased rates of skin cancer in humans
What is the approximate pressure of a storage cylinder of recovered R-410a that does not contain any non-condensable impurities and is stored in a room where the temperature is 80 F?
238 PSIG
What refrigerant is typically used for retrofitting household refrigerators?
R-600 A
What is the evaporative temperature of R-134A at 5 PSGI
9.1
What is an inert gas example?
Nitrogen
What is the center port on a three-port manifold used for? 3 part question
Charging, Recovery, Evacuation
After installing and opening a piercing access valve, the recovery procedure cannot begin if the system is at what pressure?
0 PSIG
Recovery devices used with small appliances have to achieve what standard?
Double points if you answer the 2nd part of the question
What is the standard?
90 % of refrigerant on working compressors
80 % of refrigerant on non-working compressors
while obtaining 4" of vacuum
AHRI 740
What refrigerant is the baseline for GWP?
R-744
What does ASHRE standard 15-2013 state?
all mechanical rooms should be equiped with room sensors for refrigerant leaks
Which refrigerant has the lowest global warming potential?
R-600A
Why can a very large refrigerant leak cause suffocation?
Air is heavier than air, and displaces oxygen
What is the approximate pressure of a storage cylinder of recovered R404A that does not have any impurities mixed with it stored at 80 degrees F?
174 PSIG
What is the GWP rating for R-410A?
2090 GWP
Pressure relief valves should never be installed in.....?
series
What is the Montreal Protocol?
International Treaty that addresses ozone depletion substances and their alternatives
What condition can cause excessive pressure on the high side of a self-contained (active) recovery device?
Large volume of non-condensable gas in the refrigerant being recovered
What is the maximum charge of refrigerant in an appliance that is allowed to use system dependent recovery equipment?
15 LBS
List all of the HFO refrigerants found on the PT chart
R-1233zd
R-1234ze
R-1234 yf
What is considered a major repair, as per the EPA?
Condenser
Evap coil
Condensing coil
Metering device
How should disposable cylinders of CFCs, HCI and HFCs be discarded?
Recovered the remaining refrigerant, puncture the rupture disk and render the cylinder useless
How many access valves are needed to recover the refrigerant on a sealed system with an operating compressor that has completely restricted capillary tube? Where should they be placed?
2 valves, one of the high side, one on the low side
Why shouldn't piercing valves be left on a system?
they tend to leak
How long do companies need to keep record for disposed appliances for?
3 years
What should be done after reaching required recovery vacuum on an appliance? Why?
wait a few mins to see if the pressure rises
trapped refrigerant
As of 2017, how much can a technician be fined for violating the Clean Air Act, including knowingly releasing non-exempt refrigerant from appliances?
What is the reward given to the person who rats another one out?
$$$$44,539
$$$$10,000 BOW WOWS
Before beginning a refrigerant recovery procedure, what is ALWAYS necessary to do?
Know the type of refrigerant in the system
How do you speed up the recovery process on a frost-free freezer?
Turn on the defrost freezer on the system
What is the primary water source for water cooled recovery units condensing coil?
Local municipal water supply
What is the safe pressure rating on a low-pressure chiller?
What pressure must you not exceed? Why?
10 PSIG
15 PSIG, rupture disk will fail
Why is it important NOT to mix different refrigerants in the same container when recovering refrigerant?
They are un-reclaimable
When using nitrogen in repairing a sealed refrigeration system, what should the nitrogen tank always be equipped for?
Regulator
What gases tend to form when refrigerant is heated at high temperature?
Phosgene Gas
What are the pressure classifications for....
Low pressure Refrigerant
Medium Pressure Refrigerant
High Pressure Refrigerant
Very High pressure Refrigerant
Low pressure = Less than 30 PSIG at 104degrees F
Medium pressure =30-155 PSIG at 104 degrees F
High pressure = 155-340 PSIG at 104 degrees F
V.H.P. = above 340 PSIG at 104 degrees F
When charging a chiller with refrigerant, what must you do before introducing refrigerant? Why?
Circulate water
to prevent freezing