Replyhappened to me last week... new condos...All HVAC installed and started by former employees. All work fine except one unit that doesnt cool well... What can you do except fix it and move on?
Member
Happened to me yesterday. A previous installer set the Cooling Coil and ran the line set , electrical, etc... and all it needed was the Condensing Unit outside. I install the Unit and fire her up only to get pressures reminiscent of bad compressor valves (very high suction and very low discharge), with lots of liquid returning to the compressor. Tried pumping the system down, and it wouldnt go into a vaccuum . So, i unscrewed the liquid line Brass Coupling, and wullah....no piston inside ; how nice of the previous Installer.
Professional Member
happened to me last week... new condos...All HVAC installed and started by former employees. All work fine except one unit that doesnt cool well... What can you do except fix it and move on?
Grumpy Old Man
Do you actually believe the missing Orifice caused this scenario?Originally posted by hvacfella
Tried pumping the system down, and it wouldnt go into a vaccuum .
Professional Member*
I find at least 2-3 systems a year that have been running for years with no metering device whatsoever.
I also find about 1-2 system a year that has a TXV added to it, but still has the orifice in the fitting in the coil.
Most of the time it is a Carrier system that I find that on. I assume it is because the add on TXV kit Carrier used to supply was sweat fit to the liquid line, and the idiot installers never bothered to take the fitting apart at the coil.
Most manufacturers TXV kits screw into the fitting where the orifice goes, but I have found that doesn't always guarntee that the installers didn't leave the old orifice in there, lol.
[Edited by mark beiser on 07-12-2005 at 07:06 PM]
BAD EMAIL ADDRESS PLEASE FIX
Have heard of that being used as a method of collecting past due payment
i belong to peta ... people eating tasty animals. all my opinions are just mine.
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'I am an animal lover... just happen to like some for dinner
'
Reply: Hey...i LOVE animals man ; they taste so good !
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Reply: It may have gone into a vaccuum had i waited longer. It was hovering around 5 psi for about 20 seconds... when i shut the unit down.Originally posted by jultzya
Do you actually believe the missing Orifice caused this scenario?Originally posted by hvacfella
Tried pumping the system down, and it wouldnt go into a vaccuum .
Grumpy Old Man
Are you on drugs?Originally posted by hvacfella
'I am an animal lover... just happen to like some for dinner
'
Reply: Hey...i LOVE animals man ; they taste so good !
You just replied to your own thread, with something that has nothing to do with ANY of the posts so far!
Professional Member
Maybe he actually put the evap coil in too and forgot. ????
Regular Guest
I was always taught that the guy who installs the condensing unit should install the metering device that comes with the condensing unit.I wouldn't blame the installers for that one.Whoever installs the condenser should first check to see if there is a metering device,and install the one that comes with the condenser if its matching units.
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REPLY: I liked his signature so i decided to respond to IT. What are you...the Post Police ?! If you dont like the way this thread is going, leave and take some ExLax.Originally posted by jultzya
Are you on drugs?Originally posted by hvacfella
'I am an animal lover... just happen to like some for dinner
'
Reply: Hey...i LOVE animals man ; they taste so good !
You just replied to your own thread, with something that has nothing to do with ANY of the posts so far!
Member
Reply: Thats a new one ; to me, when a person installs a Pre-Air Package...its supposed to be complete . Whatever the Cooling Coil sticker says on it for piston size, that is the piston that should be in it. If the future Condensing Unit (not 'Condensor' by the way...) requires a different size piston, then it should be changed out.Originally posted by eagle1154
I was always taught that the guy who installs the condensing unit should install the metering device that comes with the condensing unit.I wouldn't blame the installers for that one.Whoever installs the condenser should first check to see if there is a metering device,and install the one that comes with the condenser if its matching units.
Professional Member
I had this happen to me today. 3.5 ton Bryant slab coil with txv and a #79 piston also. Nice.Originally posted by mark beiser
I find at least 2-3 systems a year that have been running for years with no metering device whatsoever.
I also find about 1-2 system a year that has a TXV added to it, but still has the orifice in the fitting in the coil.
Most of the time it is a Carrier system that I find that on. I assume it is because the add on TXV kit Carrier used to supply was sweat fit to the liquid line, and the idiot installers never bothered to take the fitting apart at the coil.
Most manufacturers TXV kits screw into the fitting where the orifice goes, but I have found that doesn't always guarntee that the installers didn't leave the old orifice in there, lol.
[Edited by mark beiser on 07-12-2005 at 07:06 PM]
Regular Guest
If you ever install a carrier condensing unit,you must install the metering device that comes with the condensing unit.And why wouldn't you check to be sure if the evap had a metering device in it before you pressure tested the unit anyway?Never assume anything.
Professional Member*
Mark, we just pulled out a lennox coil been running over 10 years and I always like to look if time allows just to see what # piston it was running looked in this one and it was running a number none piston.Originally posted by mark beiser
I find at least 2-3 systems a year that have been running for years with no metering device whatsoever.
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Professional Member*
i had it out of mitshubishi ductless,started it up flood-a-rama?wrapped the condenser with paper,head stayed the same 100 psi...found the bag and orifice in the packet of info.the instruction had me pointing the arrow(stamped on the brass body)opposite of flow of liquid read that 6X and what a pain to flare nut it back of the evap hanging on the wall.reclaimed it...installed it....and recharged it felt complete believe it or not!
"when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY
Grumpy Old Man
ME: Well, I don't normally read the SIG line, but it makes sense now.Originally posted by hvacfella
REPLY: I liked his signature so i decided to respond to IT.
Regular Guest
Be aware that RUUD/RHEEM often use a piston down stream from the TXV. I'm thinking it serves the same purpose as the orifice in a distributor.
Best regards....
Professional Member
I looked at a unit the other day, poor cooling, poor humidity removal. High suction, but it was hot and humid in the space. 3 ton condesor, 4 ton coil. I figured it had the 4 ton metering device in it, but I was wrong! It did not have a metering device!
Bad thing was our company installed it four years ago! I put in a 3 ton orifice, slowed the fan down. It works much better now!
Grumpy Old Man
grego, what was the pressure difference between the low/high?
And did you have to recover/add any refrigerant?
Do you have specs (before and after) the piston installation?
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