Sign In

Basic Refrigeration Circuit

BACK
By Bryan Orr
November 5, 2016

Basic Refrigeration Circuit

The following quiz contains 12 questions that will test your knowledge of the basic refrigeration circuit.

Your email address:

Your name:

Start Quiz!

1. What should be the state of the refrigerant in the suction line?

Previous Next

2. The part that is pointed at by the black arrows is a:

Previous Next

3. The discharge line travels between the:

Previous Next

4. The image below shows a cutaway of a component in the refrigeration circuit. What is that component?

Previous Next

5. Which component can often be confused with a liquid line drier because they can look similar?

Previous Next

6. Starting with the discharge line, which of the following shows the correct order of refrigerant states the refrigeration circuit?

Previous Next

7. What is the weakness of a fixed orifice metering device?

Previous Next

8. Which line would generally be slightly warmer than outdoor ambient (during cooling mode)?

Previous Next

9. Why is the compressor discharge line hot?

Previous Next

10. When the temperature of a __________ gas goes up, its volume goes _____________.

Previous Next

11. Bonus Question: You find a TXV system running high head pressure, low suction pressure, high superheat, high subcooling, and low evaporator air temperature split. What category of failure do you most likely have?

Previous Next

12. Which components make up the "high side" of the refrigerant circuit?

Previous

Related Tech Tips

hvac
Basic Refrigeration Startup & Commissioning
Let's take a walk through the startup and commissioning procedure of a conventional or “single” refrigeration condensing unit. We’re going to start with a unit that is fully piped in and has been pressurized for leak and strength testing. For brevity, we are going to assume a basic familiarity with industry standards, company and customer […]
Read more
hvac
Commercial Refrigeration Compressor Operation
Basic Compressor Functions The compressor's job is to circulate refrigerant through the system by means of vapor compression, similar to the way your heart moves blood through your circulatory system. Refrigerant circulation is measured in lbs/min or lbs/hour; this is called mass flow rate—the mass flow rate changes depending on the density of the refrigerant […]
Read more
hvac
A Case For Wireless Refrigerant Probes
Photo by Brad Hicks at HVAC in SC Right off the top, let me state something loud and clear: The tool does not make the tech. Let that sink in before you move on. A good tech has a solid understanding of WHY they are doing what they are doing, the basic math of the […]
Read more

Comments

Cliff Krug
Cliff Krug @bryanorr

Love this site. GREAT info. I use it and reccommend it to my students.Love the lectures, videos would be cool.
Cliff Krug
HVAC Instructor TN College of Applied Technology @Dickson

11/7/16 at 04:00 PM

Love this site. GREAT info. I use it and reccommend it to my students.Love the lectures, videos would be cool.
Cliff Krug
HVAC Instructor TN College of Applied Technology @Dickson

Files:
Anonymous
Anonymous @bryanorr

https://bestiptvservice.vip

7/2/25 at 06:48 PM

https://bestiptvservice.vip

Files:
Bryan Orr
Bryan Orr @bryanorr

Videos are coming. Thanks for the kind words!

11/7/16 at 06:45 PM

Videos are coming. Thanks for the kind words!

Files:
Zephaniah Benstowe
Zephaniah Benstowe @bryanorr

Greetings Mr Bryan. Am knew to this site, please can I be trained online, I want to start a career on this field. Please help

11/15/19 at 06:10 AM

Greetings Mr Bryan. Am knew to this site, please can I be trained online, I want to start a career on this field. Please help

Files:
Chris Walters
Chris Walters @bryanorr

In my classes we have a few rotary compressors and they have shiny black accumulators on them. The students call this a drier quite often because our alco display driers look very similar.
38 yrs experience, 20 years of a/c company owner, State of Texas subject matter expert and owner of a/c Training school. Currently under contract to develop a textbook

11/12/16 at 04:03 AM

In my classes we have a few rotary compressors and they have shiny black accumulators on them. The students call this a drier quite often because our alco display driers look very similar.
38 yrs experience, 20 years of a/c company owner, State of Texas subject matter expert and owner of a/c Training school. Currently under contract to develop a textbook

Files:
Bryan Orr
Bryan Orr @bryanorr

Thanks Chris! Maybe we can collaborate sometime.

11/14/16 at 02:38 AM

Thanks Chris! Maybe we can collaborate sometime.

Files:
Josh Thomas
Josh Thomas @bryanorr

I agree with the videos as well. Also love the podcast. Is a daily listen on the rides in the work van!

11/14/16 at 01:06 AM

I agree with the videos as well. Also love the podcast. Is a daily listen on the rides in the work van!

Files:
Bryan Orr
Bryan Orr @bryanorr

Thanks Josh!

11/14/16 at 02:36 AM

Thanks Josh!

Files:
Jonathan Hoeppner
Jonathan Hoeppner @bryanorr

I haven’t done any quick quizzes like this since I got my Journeyman ticket 11 years ago.
Made me think back to school. Ha. Good stuff. Thanks. Keep them coming.

1/30/17 at 02:56 PM

I haven’t done any quick quizzes like this since I got my Journeyman ticket 11 years ago.
Made me think back to school. Ha. Good stuff. Thanks. Keep them coming.

Files:
Chris
Chris @bryanorr

Recently started listening to your podcasts. Good stuff. Maybe you could do an episode on those fun carrier/Bryant heat exchangers they were having issues with.

1/27/18 at 01:23 AM

Recently started listening to your podcasts. Good stuff. Maybe you could do an episode on those fun carrier/Bryant heat exchangers they were having issues with.

Files:
David
David @bryanorr

Have to disagree with sight glass question. If you charge past the full sight glass on a cold day the system will be overcharged at higher ambient temperatures with liquid banked up in the condenser and high discharge temperatures. Also once you have charged past a full sight glass you can easily overcharge a system. The low sight glass may be due to flash gas caused by insufficient subcooling in the condenser and liquid line and not low charge,exacerbating the problem, therefore all the answers are incorrect. Also what is a cold control? It must be an American expression. Please be more specific as any control on the low side of the refrigeration system could be called a cold control. I take it you are referring to a refrigeration evaporator or coil thermostat as opposed to a room thermostat.

3/25/19 at 01:33 AM

Have to disagree with sight glass question. If you charge past the full sight glass on a cold day the system will be overcharged at higher ambient temperatures with liquid banked up in the condenser and high discharge temperatures. Also once you have charged past a full sight glass you can easily overcharge a system. The low sight glass may be due to flash gas caused by insufficient subcooling in the condenser and liquid line and not low charge,exacerbating the problem, therefore all the answers are incorrect. Also what is a cold control? It must be an American expression. Please be more specific as any control on the low side of the refrigeration system could be called a cold control. I take it you are referring to a refrigeration evaporator or coil thermostat as opposed to a room thermostat.

Files:
Tim Adamson
Tim Adamson @bryanorr

Love your work. Use alot of your content to try and train our guys

9/12/22 at 07:17 PM

Love your work. Use alot of your content to try and train our guys

Files:
Anonymous
Anonymous @bryanorr

olympe: olympe casino en ligne – olympe

4/23/25 at 08:36 PM

olympe: olympe casino en ligne – olympe

Files:
loading

To continue you need to agree to our terms.

Terms and Conditions
Yes No

The HVAC School site, podcast and tech tips
made possible by generous support from

logo logo logo logo logo logo logo logo