too much pressure in cooling system
anggi821
16 years ago
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kalining
16 years agoanggi821
16 years agoRelated Discussions
Help: New Carrier System won't cool!
Comments (8)The installer came back and measured the temperature difference between return and supply. It was 80-60 = 20 degree difference. Perfect. He sealed the supply plenum-duct connections with more mastic, added a little puron (he said that the level was ok), put a few pieces of insulation back. Nothing major. I have been monitoring the AC performance this afternnon by setting the temperature at 75 degrees (outside temp 97). In 1 hour, the temp dropped from 81 to 80 on Infinity controller, but it never stopped. My analog thermostat indicates that the temp dropped from 78 to 76. It appears that it is cooling and the Infinity Controller may be reading too high a temp! I am concerned that the system never stops. What is the typical time period that AC runs before it stops? This afternoon when I raised the temp (to 82. 99 outside), the AC came on at low cooling (never went to high cooling) and ran for over an hour before finally stopped due to significant outside temp drop....See MoreCarrier Infinity Control System Static Pressure
Comments (9)Static pressure is the difference between the negative pressure (from your returns) and positive pressure ( at your supplies). This is an indication of the air-flow over the coils. These will differ as your air filter plugs up, the "tightness" of your air filter, the duct sizing. On a retrofit I'd suggest it's OK, but there should be, on your rating plate, a spec for EST. If it's within range, you're laughing. If it isn't I'd 1st consider more return air as that's the most common fault, but I'd also look at the supplies. Are they restricted (i.e. under furniture or behind?). Are the vent dampers wide open? If you've got the gauges, try removing the filter first. If that brings it into line, you can switch the fan into the next highest speed, replace the filter and rock on....See More5 ton system pressure drop questions
Comments (8)Go to www.alpinehomeair.com and you'll find it all. But, it is a multi-speed furnace and they have it set on T5 which is @ 2,000 CFM @ 0.5"IWC. Someone else mentioned about changing condensing unit, coil, motor, etc. to be like a 4 ton system. But you have got to be kidding me, and even if it did, why? Would the manufacturer warranty this arrangement if you had problems? I just don't understand why this manufacturer and looks like most others that are designed to operate @ 2,000 CFM have no room there period. I am going to take static pressure readings and let you know later. I forced these guys to add at least one 12" return because we were short with the 4 ton unit and they were going to just cut a hole in the wall where one return already existed and they thought it would be good enough. But, now this individual return is mounted in the ceiling and is just a humming as I know this motor is ramping up like you say as the CFM is @ 750 and so is the FPM of @ 750 FPM. So, like some others have said and your saying that apparently you cannot order a standard 120K btu furnace and 5 ton condensing unit and matching 5 ton coil and operate within the specs of 0.5" IWC and (in this case 14 SEER rating) without manipulating various components in the system to try and come close or meet the efficiency that the manufacturer originally said it is capable of performing, right? If this is true, then manufacturers are not telling the truth of what a true full sized 5 ton residential system will operate in the real world and HVAC companies are covering this problem up and seems to me that there is something wrong with this picture. I had a 4 ton system that I later found out was undersized in return of at least one 10" or 12" return and I now know it would have helped considerably, but I still feel it was undersized, but again what I feel and what the professionals know and might could have done to make it work is another matter. The problem is my wife and I want 72 degrees year around inside whether it hits 115 degrees outside or -15 degrees and if it causes the system to be oversized for those conditions and makes it less efficient, that is our choice there also. Then it becomes a matter of how much oversized is too much or not enough yet, right? Just like in the opposite direction of when you perform Manual J it goes down to a 4 ton unit if your conditions are such it says 4.5 tons needed. But, what is that based on 2 days out of the year, a week, a month, you know?...See MorePressure too high. So much finger pointing. Help!
Comments (5)I 100% agree with Lurker. Having said that and figuring you will hire plumber #3 to do it,here's some additional advice applicable to any repair,be it your car or home. ALWAYS put complaints/problems in writeing then insist contractor put the proposed solution and price in writing. NEVER ask a neighbor/online pals or anyone else what you need then tell contractor what procedeure/part you want them to install. It's perfectly fine getting opinions but in the end you are wise in doing as I reccomend. If you had done that from the onset you would have nessary leverage to force the plumber(s) to fix it or refund your money....See Morejemdandy
16 years agogary__
16 years agokalining
16 years agoanggi821
16 years ago887766554433
9 years agogto3x2
8 years agoJeremy Williamson
7 years agolast modified: 7 years ago
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