Charging liquid into suction line

[Acrisoft]

Hi

I learnt and also advise my students never charge liquid into suction line.

However I found a manual which states to charge R407 into the suction line in liquid form.

Please help me understand how the compressor will deal with liquid refrigerant in the suction line

I download the manual and uploaded it to my site

acrisoft.bizland.com + mms_i.pdf

The manual belongs to:
McQuay International


Moises

[CONROD]

R407C must be charged in liquid state as it's a blend. As for charging directly in to suction I would say it all depends on how much you need to charge in and how close to the compressor you are. If you charge through a shreader connection allowing the gas to flash off slowly you should be ok. Yellow jacket also sell an adaptor for your bottle connector allowing you to safley charge liquid to sucton.

[chemi-cool]

Never is a very big word.

Me for example, I usually charge liquid into suction line but mostly before the liquid separator.

Many new blends can only be charged as liquid.

If you control the liquid amount and watch carefully that the oil in the compressor does not have too much liquid refrigerant, no problems and a lot of time saved.

This of course require experience and knowledge of the system you charge.

[dannycool]

Never is a very big word.

Me for example, I usually charge liquid into suction line but mostly before the liquid separator.

Many new blends can only be charged as liquid.

If you control the liquid amount and watch carefully that the oil in the compressor does not have too much liquid refrigerant, no problems and a lot of time saved.

This of course require experience and knowledge of the system you charge.

Is this another term for suction accumilator?:)

[chemi-cool]

Yes. Thats the one.

[Shibhrac]

Charging the new blends in a liquid phase does not mean charging it via the compressor's suction port . If we know the amount that a system required,we could use charging cylinder. We could use the easy charge adaptor.never charge the refrigerant in the liquid phase through the suction port means never. And compressor manufacturers recommendations always advice us not to charge the refrigerant through suction port incase of oil migrant and also valve damage. remember that the compressor is a machine to compress only vapour .

[lowcool]

charge using a cappillary line if your overly concerned

[tapadas]

Hi there.:)
I need to charge my A/C that uses R407C but I am confused about protocol to follow.
I ave read that the R 407C must be charge in liquid state, that seem obvious to me but is a problem, I think, to get the ***** inside by the service port.
I am wondering if it is possible to use a "transfer bottle".
The point is: Charge a small cilinder with the exact amount of R 407 we need, ant then charge the A/C via service port, and in vapor state.
I don't know much about refrigeration, so I ask for help in this situation. I really need to charge that machine.

Any help will be appreciated.

[Brian_UK]

Hi there.:)
I need to charge my A/C that uses R407C but I am confused about protocol to follow.
I ave read that the R 407C must be charge in liquid state, that seem obvious to me but is a problem, I think, to get the ***** inside by the service port.
I am wondering if it is possible to use a "transfer bottle".
The point is: Charge a small cilinder with the exact amount of R 407 we need, ant then charge the A/C via service port, and in vapor state.
I don't know much about refrigeration, so I ask for help in this situation. I really need to charge that machine.

Any help will be appreciated.Charge in liquid form, it is quite simple.

Connect the bottle to the system via your manifold set as usual.

Open the bottle valve, if it has a dip-tube fine if not then invert the bottle so that liquid will come out.

Now crack open the valve on your manifold set so that the liquid is expanded through the valve into a vapour mix before entering the system.

Liquid has come out of the bottle and that is what must happen.

[NoNickName]

chemi-cool has got it right.
After all, you wouldn't be able to charge a system in the liquid line this time of the year.

[Peter_1]

You can do it easily with a recovery station which we always we do when we recovered gs for a repair.
Station is already on-site with the right gas on the inside of the unit, no need to vacuum it again.
And we don't have to calculate the amount of gas, all what was recovered goes back in it again.
Handy when working on VRV's or VRF's which need a correct amount of gas...they say

[Collie]

Dont scrolls allow for easier charging of liquid through the suction? I think they handle it better because it wont try to compress the liquid, there is a valve that lifts and allows the liquid to pass through with compression occurring........i think :D

[tapadas]

Charge in liquid form, it is quite simple.

Connect the bottle to the system via your manifold set as usual.

Open the bottle valve, if it has a dip-tube fine if not then invert the bottle so that liquid will come out.

Now crack open the valve on your manifold set so that the liquid is expanded through the valve into a vapour mix before entering the system.

Liquid has come out of the bottle and that is what must happen.

Thanks Brian!

The situation is now clear for me.
When the liquid reaches the valve it passes to vapour phase due the low pressure on the other side of the line.
I suppose that happens because the compressor create a very low pressure on the service port vaporizing the ***** as son as it pass through the valve.
I have another question, sorry for the inconvenience, its possible the manifold freeze due the ***** expansion before entering in the suction port?

[Brian_UK]

I have another question, sorry for the inconvenience, its possible the manifold freeze due the ***** expansion before entering in the suction port?
Yes, you can get frost on the manifold but remember that in most cases you are also using the valve core in the access port as another expansion device.

Do it sensibly and you will soon get a 'feel' for how much to set the manifold valve at.

[tapadas]

Thanks Brian.;)
Now, I feel some confidence to do the job in next weekend.:)

[NoNickName]

Dont scrolls allow for easier charging of liquid through the suction? I think they handle it better because it wont try to compress the liquid, there is a valve that lifts and allows the liquid to pass through with compression occurring........i think :D


Well, I've seen scroll compressors crushed because of liquid slugging anyway, despite being more tolerant.

[Peter_1]

I have a case for the Court where 8 Maneurop/Danfoss scrolls broke within 2 years on a Carrier chiller.
I have pictures of the inside, the scroll is completely gone.

[weidit]

Can't you charge the liquid threw a vac? That's what I do mostly. if you can't get it all in from vac then some equipment allows you to put it into a pump down mode to charge refrigerant. If not slowly metering it threw gauges into system can be done. Like previously said be carefully as comp shouldn't recieve liquid....

[tapadas]

Thank´s guys.

Last weekend I charged my machine with 730g of R 407C.
It was a piece of cake. I used a "transfer bottle" made of a spent oxygen bottle with a small valve fit on.
I put the bottle in a bucket of frozen salt water on top of a kitchen scale and charged it this way connected to the main bottle that was up side down, I made vacuum in the line and seal the vac pump line. After that I opened slowly the main tank valve and it took me about two minutes to get the 730g in the small bottle, an easy job to do.

[zack217]

It is possible to charge liquid into collector/receiver after the condenser instead of to suction line of compressor. However, the system maybe does not have collector/receiver.

[NoNickName]

Yes, it is not only possible, but recommended, if you have one installed.

[csdome]

Hi

I learnt and also advise my students never charge liquid into suction line.

However I found a manual which states to charge R407 into the suction line in liquid form.

Please help me understand how the compressor will deal with liquid refrigerant in the suction line

I download the manual and uploaded it to my site

acrisoft.bizland.com + mms_i.pdf

The manual belongs to:
McQuay International


Moises
I think
use a safety charge adapter from yellov jacket
or use a capillary or use a transfer bottle, or charge liquid slowly and if you hear a furry noise then stop a bit.

No hazard without risk !