Tip & How-To about Refrigerators

What a refrigerant mean

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Before I start up my topic I will like to explain what the word refrigerant means and other things that I fill you have to know more on the subject matter.
What are refrigerants? Refrigerants are fluids that absorb heat at low temperatures and rejects heat at higher temperatures. The principles of refrigerant allow for heat pumps and straight air conditioners to function properly; because of their pressure temperature relationship. This relationship allows for heat transfer.
In the HVAC industry refrigerants are given a trade name known as "R" names. Examples of these names are R22, R134a, and R502. These names help to describe the different types of refrigerants. Refrigerants have various chemical make ups, along with different properties. Some refrigerants are only able to work in high pressures while others use low pressures to function properly.
There are three main make ups of refrigerants that are currently used. Hydrogenated Fluorocarbon Refrigerants (HFCs), which is made up of hydrogen, fluorine, and carbon. Because they do not use a chlorine atom (which is used in most refrigerants) they are known to be one of the least damaging to our ozone. Hydrogenated Chlorofluorocarbon Refrigerants (HCFCs), which are made up of hydrogen, chlorine, fluorine, and carbon. These refrigerants contain minimal amounts of chlorine; they are not as detrimental to the environment as some other refrigerants. Chlorofluorocarbon Refrigerants (CFCs), which contain chlorine, fluorine and carbon. These refrigerants carry high amounts of chlorine so they are known for being the most hazardous to the ozone layer.
Sometimes refrigerants consist of a two or more chemical compounds. These blends break down into two types: Zoetrope’s and Azeotropes. Zeotrope A zeotrope is a liquid mixture that obeys Raoult's law. It shows no maximum or minimum when vapour pressure is plotted against the composition at a constant temperature.Zeotrope refrigerant mixes are mainly made of three different types of refrigerants. The characteristic that describes this type of refrigerant is that all three refrigerants keep their own properties; they act as 3 individual refrigerants. Azeotropes are mainly a blend of two refrigerants. The property that defines this type of refrigerant is it acts as a single refrigerant. This effect the boiling points of both types of refrigerants.
The most important fundamentals of refrigerants before expanding into how they work. This key principle is that refrigerants do not make things 'cold' they remove heat. This principle is preached in the HVAC industry. It is a common misunderstanding of homeowners and technicians.
A pressure temperature relationship is a way of describing the specific temperature that relates directly with the pressure of a substance. This allows control of refrigerants boiling temperatures. Controlling a refrigerants boiling temperature allows for proper heat transfer.
Heat transfer is when heat from one place is transferred to another place, this is also referred to as a refrigerant cycle. Generally we control heat transfer through air, water and refrigerants.
This type of heat transfer happens through conduction. Conduction is when heated molecules, with lots of movement, collide with slow moving molecules. The warmer molecules, fast moving, always move towards the cooler ones, or the slow moving molecules.
Refrigerants are sold in disposable container that includes a check valve. This limits the reuse of old refrigerants and prevents mixing refrigerants. Refrigerants are identified by a standard color code. The labels also contain information on which type of refrigerant is in the container along with any safety hazards there are.
There are several safety hazards when handling refrigerants. In order to help prevent damage to the ozone, technicians are required by law to become EPA certified. There are four (4) main types of certification; Type I, Type II, Type III, and UNIVERSAL. Type I includes small appliances such as refrigerators. Type II includes high pressure appliance with the exclusion of small appliances such as split-systems. Type III includes low pressure systems such as chillers. A Universal certification includes all three types of certifications. For more information on refrigerants, their properties, how they effect the environment, and becoming certified.

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Where's the low pressure canister


If you are talking air conditioning.....the low pressure canister also known as a receiver/dryer is usually on the larger of the two a/c lines.Follow the larger line to the receiver/dryer which also may have the low pressure side fill port on it or near it.If you are looking to top up your a/c system,NEVER use a aftermarket refrigerant with an EXPLOSIVE warning on it.These refrigerants are usually a mix of butane and/or propane and you may not want that in your a/c system in an accident situation where it may blow into your vehicle compartment because of a ruptured a/c line. Fire is never wanted in an accident.Use only factory approved refrigerants.

Apr 21, 2017 | Cars & Trucks

2 Answers

can I recharge refrigerant in Delonghi model paca110 ?


are you a licensed repairman if not you can not

Jun 03, 2016 | DeLonghi Heating & Cooling

1 Answer

will ac compressor make noise when freon is low. there is a chirping sound coming from what sounds like the compressor. it has new belt , water pump, idler pulley, tesioner and alternator...


yes it can. this may mean the death of the compressor is inevitable, has been filled with the wrong refrigerant/lubricant, or it is low on refrigerant. you have to determine what type of refrigerant is needed, (usually R12 or R134) and use the correct lubricant, if the refrigerant does not have the lubricant already in it. every time a compressor is filled with refrigerant, it also needs th be filled with lubricant, and most, but not all, commercial refrigerants include lubricant. if there is a leak in your system, you can use soapy water in a spray bottle to find the leaky hose/connection.

Mar 26, 2011 | 1993 Chevrolet K1500

1 Answer

the compressor is on but not cooling


The reason why its not cooling is because it needs to be charged with refrigerants. Try charging it with the compatible type of refrigerants.

Nov 01, 2010 | Estate Refrigerators

1 Answer

can you put r408a in r404a compressor but the system is on r502 they used r408a as a drop in. is the oil in the system compatable


R 404a compressors use ester oil, this oil can be used with old and new refrigerants.
R502 and R408a compressors used mineral oil, that oil cannot be circulated by new HFC refrigerants like R404a.
So if you know the oil is compatible and the refrigerants have very similar cooling characteristics ...I can't see y not.

Oct 01, 2009 | Refrigerators

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