the next line we have is going to be called our suction line also called a gas line this is going to be the larger pipe remember it's going to be larger because we allowed for expansion so this larger pipe i've painted it blue because blue is going to represent low pressure but in the filter just simply copper colored so this is leaving the evaporator coil on this coil down here all these pipes come together into one tube and we have one simple pipe coming out notice this pipe has insulation on it it should and we're
going to talk about that later on but this pipe right here is our suction pipe we're going to do is we're going to look at our refrigeration cycle and we're going to add our drawing this suction line is going to go all the way back to the compressor so this line has two names it's called a suction line it's also called a gas line i select to combine it to a suction gas line the state of refrigerant in this line is a low temperature so if you touch it to your feelings low temperature and it's
going to abbreviate lt and then low pressure lp but the state of refrigerant is going to actually be a superheated vapor i understand that talking about superheated vapor may make you think what what's going on you have lots of questions i love that you have questions hold onto those questions write those questions down as we go through these videos we're going to explain that and there's a lot of magic that goes into that but hang on we're going to talk about it we're also going to make sure we put arrows so we know the refrigerant
is leaving this evaporator going through this larger suction gas line to the compressor low temperature low pressure superheated vapor so if we physically follow these tubes we're going to end up back to the outdoor unit so if you see in our picture our suction gas line comes all the way back to the compressor it makes a complete cycle if we follow the suction line we see this suction line is going back towards the compressor now as we follow the suction line it goes all the way back to the compressor so now that we're at the
outdoor unit this suction gas low temperature low pressure superheated vapor is flowing all the way back to the compressor we've now made a complete cycle so this suction gas line the compressor sucks in low temperature low pressure superheated vapor pumps out high pressure high temperature superheated vapor vapor goes in vapor comes out liquid should never end up in this line if you also see there's some similarities here we have a blue gauge here and this blue gauge has a hose that's going to hook over here to this port just like we had a port for
the high side we have a port for the low side we also have a valve for the high side where we can take this valve off right here this cap and there's a valve that we can open and close there's a lot that we can do with that we'll again talk about that later as well but this is blue gauge represents our suction side the raid red gauge represents the high side so if we see we're looking at our gauge set blue represents our evaporator red represents our condenser anywhere that's blue is all should be
approximately the same pressure and anywhere that's red should approximately be the same pressure whole lot more details to this but this is the suction gas line the suction lines the fat line the thick line it usually has insulation on it very important we get the refrigerant all the way back to the compressor if you were to touch this line according to you and your feelings this line the suction line would feel cool to the touch because it's low temperature low pressure that's why you use blue
