A lot off mini splits meter the refrigerant at the condenser so the liquid line is more of a saturated line. Was the liquid line insulated?

 

The small line that you think is a liquid line, is really another suction line.

 

its actually the saturated refrigerant line

did you find the leak?

 

Not familiar with these, but if he read 55psi and 75 psi, is that just the pressure drop from start of suction line to compressor inlet that he is reading? i.e. the pressure drop across coil and piping is 20 psi?

 

They usually only have 1 gauge port

You can only charge by weight

 

Can someone refer me to a source for more complete info on this type of system?

 

liquid line is not insulated

 

Is there a way to tell ,by looking at the outdoor unit, if it meters at the condenser or the indoor unit? I'm interested in the possibility of interchanging different brands of units.

 

Like putting a Samsung on a sanyo?

Remember these units are matched systems.

 

What brand? As stated above, most of these units meter the refrigerant at the condensing unit. There for the "liquid" or small line should be cold but not frosting. Most likely a leak at the flare fittings.

 

what brand



I'm w anting to know how to tell if a unit meters at the condenser or at the evaporator .I don't want to check in here for every brand I encounter. Thanks Jim

 

you can get about all the info for any brand using google.

 

I can't recall seeing any minisplits that weren't metered in the condenser. I don't work on a lot of them though.

 

I've worked on many of these. Charge to 70psi and go home. There are a few brands that max out at around 60psi, but once u charge to 70 u will be fine. 55 is too low and it would cause your liquid line to frost.While your charging u will notice the ice melt off once the proper pressure is reached.

 

Don't the rest of that day's customers get really pissed off?

PHM
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I've worked on many of these. Charge to 70psi and go home . . . .

 

Do you not take the superheat?

 

And to think i have doing it wrong all these years, thanks for clearing it up for me Joe.

 

How do you do it Bo?

PHM
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Pull the charge, if its not even close to the label charge find the leak and weigh in the charge. It seems like most of these type units, the basic charge will cover up to 20 -50 feet of line set. Otherwise follow the installation paperwork .