How to recharge a fridge r134a: A Beginner’s Guide to Recharging

Are you questioning how to recharge a fridge r134a?? Is your fridge isn’t cooling sufficiently? Is your compressor making noises? Maybe the issue comes from the Freon and your fridge needs to recharge with Freon.

R134a and all different refrigerants in refrigeration systems work in a closed cycle system. The refrigerant is pumped around the system absorbing heat out of your refrigerator again and again.

Some fridges don’t have charge ports. welded within the line So in these instances it’s a must to install one.

So in this article, we’ll present to you How to recharge a fridge r134a? make charge ports, and everything it’s essential to charge your fridge.

How to recharge a fridge r134a?

What are the Tools you need to recharge a fridge r134a?

  • measure hose gauge adapter ac refrigerant.
  • a piercing valve.
  • Refrigerant
  • Allen wrench
  • screwdriver
  • sandpaper

Why do you have to be fill your fridge?

If your fridge would not cool off very properly or makes some strange noises if it is low refrigerant you will hear strange noises from the compressor, the refrigerant carries a little bit of oil via it, subsequently, it lubricates the compressor.

 if you’re running out of refrigerant the compressor will run dry and it may cause issues.

the flow of the coolant from the fridge compressor throughout via the liquid line and across through the

condenser into the evaporator then it comes out this way through the suction line.

so the compressor has to push refrigerant through the track that we mentioned above to cool the fridge and then come back down.

So the pressure line or suction line will have negative pressure so the compressor will be began of freon and therefore will not be able to chill off properly that’s why it’s a must to have the proper level of coolant inside for the fridge to work correctly.

Is it worth recharging a refrigerator?

Depends on the severity of the problem.

If your refrigerator is low on refrigerant, it means that there is a leak somewhere in the refrigeration system. If this leak is not repaired, it makes no sense to recharge the system.

If the leak is readily accessible, by all means, repair should be considered. Also, age and condition should be considered.

If the leak is not found because it is in the walls buried by insulation, it is not repairable.

How do you know which one is suction line which and which one is the liquid line?

the liquid line usually is hot subsequently the suction line is colder.

Note: before you begin any work on a fridge unplugs it from the power line.

How to Recharge a Fridge r134a Step-By-Step

Step1. Pull out your fridge

pull out your fridge to have access to the back of your fridge and have a free room to work comfortably.

Step2. Remove the back cover.

Use a screwdriver to unscrew the screw at the back cover of your fridge and pull out the cover put it aside now you could have access to the compressor.

Step3. Install the piercing valve.

you can take the piercing valve aside and the pipe goes in, there is a special tape over there that will allow you to seal the pipe it is known as some piercing valve.

The piercing valve comes with two special adapters for each type of pipe so you have to use the one that is designed for your pipe accordingly.

The piercing valve needs to be installed on the suction line

before you choose the location for it it’s a must to be very careful.

 the suction lines have different sizes and that’s why they give you the two adapters you have to discover the wand it’s specifically designed for the actual line.

How do you select the location of the piercing valve?

 you will need to have access to it because you’ll need to fill it up from this piece so it should be facing you so you have quick access to it which is essential.

additionally, where you’re going to put it because you’re gonna pierce it you will not be able to turn it on the pipe so make sure that you install it into the location where you don’t have to move it once you’ve installed it.

Once you find the best place to install your piercing valve.

1. take a piece of sandpaper and clean the area on the pipe where you’ll install the piecing valve.

2. insert the adapter that’s specifically for your pipe into the bottom part of the valve.

3. put the piece over the pipe and bolt it together so you could get a rough position of where it needs to go.

4. Use an Allen wrench not only to tighten the piercing valve on the pipe but also to access the valve itself.

bear in mind if you forgot the valve has to be completely open before you set the Allen wrench.

5. Use an Allen wrench to tighten up the three bolts on the outside to tighten the piercing valve to the pipe itself.

Once the piercing valve is instead installed.

Step4. Connect the measure hose gauge with the piercing valve.

Take the top of the refrigerant hose and Twist with the gauge on the piercing valve.

Use a wrench or simply your hand and Tighten the top of the refrigerant hose on the piercing valve until it’s mounted.

Step5. Install the end of the refrigerant hose with a refrigerant cane.

unscrew the end of the refrigerant hose.

Take your refrigerant can and install it with the end of the refrigerant hose.

make sure that when you pierce the valve you will be unable to move the piercing valve.

Step6. piercing the pipe where the piercing valve installed

Use an Allen wrench and turn on the piercing valve to make a hole within the pipe, the valve will get closed at the same time whereas it is making a hole within the actual pipe itself.

Step7. Open the can with the hose valve

Once you open the can with the hose valve the Freon will go through the hose to the pipe and get into the compressor

you are ready to get a reading on the measuring dial in the refrigerant hose.

In the measuring dial on the refrigerant hose, you can see there’s a green zone so that is a suction zone and then there’s a blue zone which is a pressure zone.

the place you want to be is you don’t want to have any suction on the line.

 if you’re low on Freon when you plug within the fridge to the wall you will notice that this line is going to begin to enter the inexperienced for those who are low on Freon it isn’t good as a result of the compressor is operating starved and won’t run correctly.

the place you want to be round between 1 & 3 psi so that you want to be just barely within the blue line.


Close piercing valve with Allen wrench.


Disconnect refrigerant hose.

When do we need to refill a refrigerant in a fridge?

When the unit begins to become much less environment friendly. There is a multitude of issues to verify first, nevertheless. Are the warmth exchange coils clean and unobstructed? If there’s a fan on the coils refrigerator, is it working?

Is the door seal clean, in fine condition, and sealing correctly? And lastly, if you do have to add refrigerant, you must try to find the leaks first, and deal with them.

How do I find the net weight of refrigerant 134a from the inside of vapour compression system?

I’m unsure if you are trying to estimate for a first-time charge or if you just want to know how much is in there. We’re going to assume you just want to know how much is in there. It’s deceptively simple.

  1. make sure the PSI on the low-pressure side as per the manufacturer’s specification.
  2. Take an empty R134a tank and put it on a scale. Take note of the rare weight.
  3. Attach the A/C charging station yellow line to the empty tank
  4. Evacuate the A/C system following the A/C manufacturer’s instructions
  5. Disconnect the R134a tank from the recharging station. Weigh the full tank and subtract the weight of the empty tank. That will be the amount of refrigerant in the system.

If you wish to know how much you will need for an initial charge, that will be more involved. If that is the case, let me know if it is a custom unit, how big it is, the length of tubing for both High Pressure and Low-Pressure sides and size of the compressor and evaporator coil, and if it is in a car or a larger freezer.

What is the suction pressure of an R-134 in a low-temperature deep freezer?

Assuming that the evaporator tubing is going to be running about ten degrees F colder than the air in the freezer and that the air temperature will be around minus ten degrees F (a good temperature for a deep freezer), the refrigerant pressure will be running somewhere in the neighborhood of three or four inches of mercury, which is a slight vacuum.

In the United States, pressure measurements are normally expressed as PSIG, which is pounds per square inch as measured on a pressure gauge. When the pressure drops below zero PSIG, it’s expressed in a different scale which runs from zero to about thirty inches of mercury (thirty inches being an absolute vacuum).

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