HVAC/R Refrigeration Cycle

I use a five ton Lennox heat pump to illustrate the basic refrigeration cycle.

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Howto & Style

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• DrZarkloff
• Starkloff
• HVAC
• refrigeration
• cycle

[deyenak1]

How come when the cycle reverses into heat mode, the refigerant lines are able to work effectively being the liquid line now becomes the suction line or am I missing something. Why do we have a bigger and a smalller tubing if it can work in the opposite manner and still work effectively?

[DrZarkloff]

@deyenak1 The smaller tubing is always the liquid line and the larger tubing always carries vapor no matter whether it's running in heat or cooling.

[1bengrubb]

You said at the expansion valve it becomes super heated vapor ---- did you mean super cooled? I assume you got rid of all the heat at the condenser.

[DrZarkloff]

@1bengrubb The refrigerant collects heat at the evaporator, hence the refrigerant becomes superheated.

[spelunkerd]

Newbie alert.

The expansion valve had three copper pipes leading in, two large size and one very small diameter. Is the third a pressure feedback device to automatically adjust the diameter of the aperture? Which tube was that?

[DrZarkloff]

@spelunkerd The small tubing is the external equalising tube.

[DrZarkloff]

@sergioalv62 I'm sorry about the noise.

[sergioalv62]

beside i am not a good english speaker, i can`t hear you because the hard noise of the pump. However, it`s a good attemp to explain. thanks from mexico.

[thereceman]

actually it is faster to recover the refrigerant in the vapor side of the recovery tank, because the refrigerant does not have the go through the dip tube on the liquid side it was just spray into the top of the tank

[killourhy82]

thanks for making these videos, make more