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What is the meaning of Refrigeration - Heating & Cooling

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Well, the definition of cold is the absence of heat. So I think the definition of refrigeration is the process of removing heat. Please let me know if this helped.

Posted on Jan 26, 2009

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My fujitsu heat pump asta12lcc not working. Operation and timer flash twice then operation flashes 3 times, cycle repeats self. What does this mean? Thankyou

Error code = Operation light x 5, Timer light x 2:
IPM protection
Abnormal current value of IPM is detected.
> Permanent stop.
[Diagnosis Point]
- Heat radiation is blocked (inlet/outlet). - check indoor and outdoor coils for blockage by dirt. If outdoor blocked, turn off power and gently hose down coils from top to bottom (that's the radiator like assembly). Don't spray upwards as you can force water onto circuit boards. Allow to dry and turn power back on to check.
- Check if outdoor fan is defective (does not rotate).
- Controller PCB defective (Refer to after mentioned "IPM diagnosis").
- Refrigeration cycle defective (Refer to after mentioned "refrigeration cycle diagnosis").

This normally ends up being a faulty controller board but there are quite a few tests that you will need to do to make sure that no other parts are causing the error. It's best to get a tech in for this one.

Jul 27, 2015 | Fujitsu Heating & Cooling


Refrigeration is actually a fairly straight forward easy to understand process....

Refrigeration is actually a fairly straight forward easy to understand process. Although there are several ways that refrigeration can be achieved in a system, the most common is vapor compression, in which the compressor is the heart of the system. The temperature of the refrigerant is related to its pressure. For example R134 is roughly -15 degrees Fahrenheit at no pressure. (Thats gauge pressure and not absolute). When compressed to 250 psi R134 is about 148 degrees. 
 Starting from the compressor, the refrigerant vapor is compressed. In the process it will heat up hotter than the surrounding air. As the refrigerant passes through the condenser, heat is given off since it is hotter than the surrounding air and as a result it condense and turns liquid.(thats why it is called a condenser). The liquid refrigerant then passes through an expansion valve or a capillary tube where it turns into low pressure liquid and as it passes through the evaporator  absorbs heat from its surrounding since it is much colder. This makes the refrigerant turn into gas and evaporates (again it is why it is called the evaporator) absorbing tremendous amount of heat. Then refrigerant vapor  passes through the accumulator in which  moisture accumulates ( why it is called the accumulator) before it is sucked into the compressor to be compressed again. (Why do you think the compressor is called compressor? you know the answer by now) 
 The whole system is really a means for heat transfer for removing heat from one place and expelling it outside  in which the refrigerant is the vehicle.  Heat always travel from hot to cold. If something is hotter than the surrounding, it gives off heat and if it is colder, it absorbs heat. Simple as that. There is a thing called latent heat of vaporization or in thermodynamic term it is called enthalpy of vaporization. This simply means when liquid reach its boiling temperature at a constant pressure it will no longer get any hotter. . For example when you boil water at sea level it stay 212 degrees no matter how much heat you put under the pot. You can also think of it as putting heat into it but it is not doing anymore work. since the water is not getting any hotter. If there was meat in there it would not get soft any faster by adding more heat. The water will just absorb all that heat without getting any hotter. That is just one of those wierd law in physics and it is the underlying principle in theory of refrigeration. It is the fact that when liquid evaporates, it absorbs tremendous amount of heat and carries it away. Rub alcohol on your skin and the skin feels cold as the alcohol  evaporates. Thats a simple form of refrigeration at its very basic. 
 There are other types of refrigeration for example another one is called "absorption system". This kind uses heat to vaporize liquid (usually ammonia and water solution) mixed in an absorbing material. as the subtance evaporates it accumulates on the other end as liquid. When heat is taken away, the whole thing cools down and the pressure drops to a point so that the liquid that has accumulated will evaporate and be collected back on the absorbing material. This produce refrigeration. It has no moving parts no compressor and just uses heat. In fact it can be used as ice maker which is ironic since it works by heat. The last one would be thermoelectric. If current is passed through two dissimilar metals one of the metal will get cold at the junction, and it is called the peltier effect. Coolers that plugs into cigarrete lighter are example of these type of device. They are not really very efficient but have some advantages such as it can be used as food warmer when the current is reversed. 

on Jul 10, 2010 | Heating & Cooling

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101 low side presure means

I'm not sure what you question is, or what "101" stands for in this case (a reading maybe). Refrigeration units have both a "Low side pressure" and a "High side pressure" The metering device divides the two sides, Please phrase your problem as a question.

Dec 11, 2013 | Heating & Cooling

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Good day! A condo suite has a programable digital thermostat operating on 24v for heat (geothermal heat pump solenoid valve) ac, and a humidifier to control. When the humidifier kicks the fan coil...

Hi, start at the thermostat on this unit if nothing else has been done as far as trouble shooting and repairs. 3 months doesn't mean a thing when it comes to a/c and refrigeration & heating parts. Check the stat operation, or replace it, and I am 99.9% sure this will solve your control problems.
Sincerely, and a good day to you!
A/C, Heating & Refrigeration Contractor.

Feb 09, 2011 | Heating & Cooling

1 Answer

All water lines are not hot

Do you mean refrigeration lines? In general the bigger line of the two should be cold and the smaller line should be warm to touch. Depends on what the ambient temperature is outside. If it is cold outside the little line or liquid line will be cold. And if both lines are Hot you either have a heat Pump or the Valves are out of the Compressor. Will need more information on your problem.

Dec 19, 2010 | Heating & Cooling

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Cold Air is at a minimum Can it be recharged?

i am trying to undestand what you mean with refrigeration minumum is very cold which would be a good thing.but i am assuming you mean your cold air is not cold enough.this small units generally don't have a charging valve,but if it does yes you can charge it more but not to much because your air is not going colder if it has too much thecase the unit does not have a valve you can install one but you need a torch to solder it and the use a vacuum pump to remove the air insede the tubing then you can charge the freon.also in the refrigeration stores they sell solderless valves which you can install but have to be very carefull that they don't leak after isntalled.hope you got all my expanation and it can be usefull foor you.

Aug 12, 2010 | Haier HPAC9M Air Conditioner

2 Answers

What does the asterickon the wall control mean

There are at least a dozen brands of controllers that will work with that many different ACs.
You need to state the make and model number of the programmer/controller.

Jul 07, 2010 | Goodman Heating & Cooling

1 Answer

How do you use the temp/pressure chart with refrigeration

At R22 it should be 65 psi at the low side and 200 to 285 on the high side. Or slightly higher than freezeing at the indoor coil.

Mar 31, 2009 | Heating & Cooling

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Glycol pump R0156821

if you are looking to replase the pum call you local refrigeration co. or wholesale refrigeration supplier . You can also check with bar/ equipment suppliers in the phone book.

Oct 20, 2008 | Heating & Cooling

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Clean unit

could be leak out or its probably empty and need to be fill it again... its not really expensive, and doing that you may need a experience aircon/refrigeration service tech.

Jul 27, 2008 | Maytag M7Y15F2A Air Conditioner

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