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The shelf compressor only cools the shelf, it has two caps. One cap is for cooling, one is for when the recipe calls for no cooling. The condenser compressor cools the condenser of course, unless the switch is off. If the shelf is on and the condenser switch is off the condenser compressor still runs and supports the shelf cooling.
Originally Posted by ammoniadog You could always completely fill up the receiver and make it act like a critically charged system again, or probably better yet, just remove the receiver. Originally Posted by ETC1 Filling the receiver will make for interesting start up. Since the refrigerant in a cap tube system will tend to migrate to the coldest spot...,ie the evaporator...adding a receiver full of liquid to the mix can cause some very severe floodback on startup. Most of the units where I've found them receivers installed with cap tubes had 1-2 year old compressors with bad valves. I'm surprised those little guys lasted as long as they did.
Originally Posted by jimp One of the machines is a Virtis Ultra LE 25, has daul compressors with receivers and caps. Cooling multiple loops (shelf/condenser/neg. shelf) at different times during the run, sometimes more than one loop. Varying loads - a small receiver helps reduce the time spent pushing vapor through the cap tubes... This is what I've always assumed. Of course, anyone doing Ultra Low temp long enough knows that some of the normal rules get ignored.
Filling the reciever will make for interesting start up. Remove reciever and install cap tube drier or some other access for highside. In the 80's I serviced an ice bank bulk tank with captubes and recievers. The recievers were due to length of evap. tubes. Thus large volume of refrigerant required to flood
One of the machines is a Virtis Ultra LE 25, has daul compressors with receivers and caps.
You could always completely fill up the receiver and make it act like a critically charged system again, or probably better yet, just remove the receiver.
Thanks for the info guys. This has already been hacked together and getting it working was most important. Just putting off the replacement for a bit.
Originally Posted by icemeister While that would be considered a receiver...technically, it's not exactly the type we were referring to. Perhaps jimp is just having a bit of fun. Exactly.
Originally Posted by cmclifton Expansion chamber... While that would be considered a receiver...technically, it's not exactly the type we were referring to. Perhaps jimp is just having a bit of fun.
Expansion chamber...
Originally Posted by pecmsg Our ULT are cap tube and no receivers Maybe he's talking about an HX. Kinda looks like a receiver.
Originally Posted by jimp Funny, I have several factory build systems that run from -60c to -150c with caps and receivers. Our ULT are cap tube and no receivers
Originally Posted by jimp Funny, I have several factory build systems that run from -60c to -150c with caps and receivers. Do you have any piping diagrams for these? It would be interesting to see what they're doing differently.
Originally Posted by jimp Funny, I have several factory build systems that run from -60c to -150c with caps and receivers. ULT. Different animal.
Funny, I have several factory build systems that run from -60c to -150c with caps and receivers.
A capillary tube cannot work properly with a receiver. Yes, you can get the system to cool, but that doesn't mean it's working right. Here's a past thread which gets into more detail on the subject: http://hvac-talk.com/vbb/showthread....-tube-question
According to nccer receivers are of little to no value with a fixed metering device. That gives me the impression that it wouldn't hurt anything but is pointless.
Normally no. Have seen some RIs with remote condensing units that has them, TXV set up though.
Originally Posted by oldpizzaguy On a reach in cooler is it wrong to have a condenser with a receiver? Thanks A refrigeration system using a capillary tube expansion device is, by definition, a critically charged system. A refrigeration system using a receiver is, by definition, not a critically charged system. Attempting to apply a capillary tube on a system having a receiver is attempting a contradiction.
Not a good combo. What's the model # of this unit.
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