Adding r410 to new mini split system.

[ecnsupplies]

I have a brand new 28btu pioneer mini split cassette system. I have vacuumed the system and it holds a vacuum for 24hours.
My question is my line set is longer then the 16 foot so I need to add .68 lb more r410. I connected the hoses to the valve but no freon will go in. I tested and if I remove the yellow hose from mini split freon does go out the hose.
Do I need to release the Freon in the new mini split system first before I can add more Freon to it?
Will the hex nut using the wrinch valves not being open stoping the Freon from going in?
The book says you have to open this to release the stored freon into the line set.
It does not restrict a vacuum from being pulled.
I just want to make sure before I release the new freon in the unit to the line set. Before Tring it that way. Hope this makes sense.

 

[fitter30]

Question after connecting the drum purging the yellow hose to manifold vacuum was still showing vacuum ? Then open blue hose gauge pressure went up but nothing flowed in? Yes or no? If no the adapter didn't push in schrader valve. With needle nose twist center piece ccw 1/2 turn try that might need to turn it another 1/4 turn. Pull another vacuum. That is why we pressure check with 500lbs nitrogen at least 4 hours then pull a vacuum with a micron gauge. 11 oz of 410

 

[American Locomotive]

The pressure of the r410 inside the system and your bottle will be exactly the same. The system will need to be running in AC mode before you can add gas. You need to release the charge in the system, start it up in AC mode, then add your gas.

 

[ecnsupplies]

Thank you. The system is new and I expected I needed to release the gas into the line set first. Did not know if the Alan screw in the valve was blocking it from adding gas. I will release the gas into the line set and then turn on the ac then add my .68 lbs because the line set is over 16 feet. Thank you again.

 

[chinboys]

Your start up procedure seems to be correct but flawed at the same time.
One usually pressurizes with nitrogen to under the maximum operational pressure (300 psi) before pulling a vacuum of 200 microns for a couple of hours.
Once you confirm you don't have any leaks is when you remove the liquid and vapor caps covering the hex head valves to release the system's stored refrigerant into the both liquid and vapor lineset.
The R410 refrigerant is a mixture of two HFC refrigerants that have different boiling points and critical temperatures. This blend of refrigerants must be installed as a liquid. The tank should be inverted on a tared scale to meter out the. 68 pounds. Ideally, the you measure the superheat to get the most precise charge on mini split systems. But i have seen manufacturers recommendation of adding x ounces per unit extra feet of lineset.
The liquid addition should be slowly feed into the running systems suction or vapor line as to not slug the inverter scroll compressor with pure liquid.

 

[justinjoyal]

Your start up procedure seems to be correct but flawed at the same time.
One usually pressurizes with nitrogen to under the maximum operational pressure (300 psi) before pulling a vacuum of 200 microns for a couple of hours.
Once you confirm you don't have any leaks is when you remove the liquid and vapor caps covering the hex head valves to release the system's stored refrigerant into the both liquid and vapor lineset.
The R410 refrigerant is a mixture of two HFC refrigerants that have different boiling points and critical temperatures. This blend of refrigerants must be installed as a liquid. The tank should be inverted on a tared scale to meter out the. 68 pounds. Ideally, the you measure the superheat to get the most precise charge on mini split systems. But i have seen manufacturers recommendation of adding x ounces per unit extra feet of lineset.
The liquid addition should be slowly feed into the running systems suction or vapor line as to not slug the inverter scroll compressor with pure liquid.

Max operating pressure can very well be over 300 psi. Pressure test at 400+ psi if you really want to be sure.

You don't charge a mini-split using superheat, unless you can be sure it is operating at full capacity, which is not always easy to tell with inverters and variable speed fans. You weigh in the proper charge according to the manufacturer, that way you know you're good to go.

OP: The submittal sheet I see for a Pioneer cassette shows a pre-charge for up to 25', not 16'. Are you sure you have the correct information ?

 

[ecnsupplies]

The pressure of the r410 inside the system and your bottle will be exactly the same. The system will need to be running in AC mode before you can add gas. You need to release the charge in the system, start it up in AC mode, then add your gas.

Found the issue. I must be sleeping. The yellow charge hose was on backwards. The bend goes on the gauge and the straight goes on the tank. This was stopping the Freon from going into the line set. Hope this might help others that make the same mistake. I added my .68lb and all is working. Thank you for your help.

 

[PoorUB]

Found the issue. I must be sleeping. The yellow charge hose was on backwards. The bend goes on the gauge and the straight goes on the tank. This was stopping the Freon from going into the line set. Hope this might help others that make the same mistake. I added my .68lb and all is working. Thank you for your help.

The hose direction should not matter, but sometimes the fittings on a minisplit do not work well with low loss hoses.

 

[justinjoyal]

The hose direction should not matter, but sometimes the fittings on a minisplit do not work well with low loss hoses.

One end probably has a core depressor and the other does not.

I don't see how that would matter when hooking up directly from the manifold to the r410a tank though, unless it was a special kind of tank/can/container ?