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Will turn www.example.com into [URL]http://www.example.com[/URL].
Depends if metering device has liquid seal or not.
Originally Posted by jpsmith1cm The systems that I've dealt with that have non-condensibles in them did work well enough. They just tripped on high pressure on occasion. I was under the impression that nitrogen would find a place to "settle" in the system, such as the top of the condenser coil, any truth in that?
Originally Posted by Thermodynamics I'm going to theorize about what would happen in this system. Let's say his pressures were right for the system, but it was mixed with nitrogen/r22 refrigerant: 1. The compressor would pump a nitrogen, r22 vapor mixture through the condenser 2. R22 loses heat and condenses to a liquid, nitrogen remains a vapor in the liquid line 3. Now you have liquid refrigerant mixed with nitrogen vapor bubbles. 4. As these bubbles flow through the metering device, there wouldn't be any metering done until liquid refrigerant enters the metering device. There's no possible way a system could cool properly. I'm sure your coworkers Delta T was next to 0, and anything he said otherwise was false. The systems that I've dealt with that have non-condensibles in them did work well enough. They just tripped on high pressure on occasion.
The damage is done I think you should take advantage of your mistake and take readings to see what non condensibles in a system looks like. Then reclaim,change your drier, and run a deep vacuum, weigh in your proper charge. Don't rush that is where accidents happen!
Originally Posted by Cosmicmuffin I know of "2" units that have been running like this for 2 seasons..,no call backs.Tech did say he had trouble getting his Delta T. in spec. No customer complaints! I,ve wondered myself,what long term affects may be? I'm going to theorize about what would happen in this system. Let's say his pressures were right for the system, but it was mixed with nitrogen/r22 refrigerant: 1. The compressor would pump a nitrogen, r22 vapor mixture through the condenser 2. R22 loses heat and condenses to a liquid, nitrogen remains a vapor in the liquid line 3. Now you have liquid refrigerant mixed with nitrogen vapor bubbles. 4. As these bubbles flow through the metering device, there wouldn't be any metering done until liquid refrigerant enters the metering device. There's no possible way a system could cool properly. I'm sure your coworkers Delta T was next to 0, and anything he said otherwise was false.
Back in one of the OP's posts, he said he would "run the vac pump for an hour," or something to that effect. OP: the time is not the benchmark to use. A micron gauge IS the way to ensure you have pulled a proper vacuum. We have left the age of running the pump for "awhile" behind us. Auto mechanics used to run a vac for only 30 mins in the days or R12 systems. I went to a class once where this was stated as the correct method. You can get an inexpensive micron gauge for less than a c-note. Do it right.
I know of "2" units that have been running like this for 2 seasons..,no call backs.Tech did say he had trouble getting his Delta T. in spec. No customer complaints! I,ve wondered myself,what long term affects may be?
Originally Posted by jpsmith1cm First of all, I don't think that running a system with a mixture of DRY nitrogen and R-22 or any other refrigerant for a few hours or even a few days will cause a noticeable reduction in the lifespan of that unit. I've seen systems operate with air in them for a substantial period of time (given the number of calls before the problem was found and fixed) with no loss of reliability after the problem was corrected. As has been said already, recover the contaminated refrigerant from the system and pull a deep vacuum on the system. There IS a way to easily and safely re-use that contaminated refrigerant, though. I won't go into it in the open forum, but I've done it a few times and have never had a problem with it. Yup. Agree on all points.
I was really cornfused as to why you were doing an AC start up in January, but being in FL explains alot If you forgot to open the service valves, wouldn't the unit be bouncing off the HPS? If the system is not equipped with an HPS you could have done some major damage to just about every component in the condenser. Good luck man, pull a 500 micron vacuum and get your subcool right and you should be squared away. PS: This thread is awesome
Guaranteed you're not the first or last guy to do that.
couple of our installers did the same to couple different systems. went back on them head pressure bouncing around like a bull in a china shop. reclaim evacuate recharge all good. keep your head up zman, keep learning, you will never stop. the guys that did it at our shop have 15 plus years they just dont read.
Originally Posted by Hvac216 With 420 in the username it is probably easy to forget something like that. lol
First of all, I don't think that running a system with a mixture of DRY nitrogen and R-22 or any other refrigerant for a few hours or even a few days will cause a noticeable reduction in the lifespan of that unit. I've seen systems operate with air in them for a substantial period of time (given the number of calls before the problem was found and fixed) with no loss of reliability after the problem was corrected. As has been said already, recover the contaminated refrigerant from the system and pull a deep vacuum on the system. There IS a way to easily and safely re-use that contaminated refrigerant, though. I won't go into it in the open forum, but I've done it a few times and have never had a problem with it.
ok fare enough ill take it and when i have time and sit down and type and ill explain my experiance and why i wrote what i did cheers genuises!!
Originally Posted by SBKold Cant be. He must have to pee.
Cant be. He must have to pee.
Originally Posted by SBKold I cant stop singing-- WHAT.......WOULD .......fengmaster do..... Heat pump.......no heat How'd it get that way?????what do I press????? I was wondering why my dog started whining
I cant stop singing-- WHAT.......WOULD .......fengmaster do..... Heat pump.......no heat How'd it get that way?????what do I press?????
Originally Posted by zman420 ok ill do thanks ,,i came to ask questions and learn ,not to be subjected to comments that are not helpful. You have to expect a fair amount of ribbing as you climb the ladder. Everyone here I'm sure got plenty, I know I did especially since when started I was working with my older brother. Look at it this way, you're learning and providing us entertainment at the same time
Originally Posted by zman420 its a factory nitro charge from a 4 ton condensor,i do not know how but it did ,and hopefully and i said hope fully running for the short time that i did will not harm the unit 25-27 years in the business and you post this i started unit with my new skills i learned on the job Now we might infer from that statement that you were either inexperienced or had no idea what you were doing. I know it sounds like we're a bunch of smart asses, but you can see from your post how that might come across. Good luck with that unit
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