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Please help me troubleshoot a residential hot water heat system!
Hello and TIA, I've been asked by a coworker to help figure out why his
house is not getting any heat. Maybe the word got out that I've installed a few forced-air furnaces, or maybe he just thinks that because I'm the supervisor of a skilled trades dept. I must be somewhat handy! Well, the jury's out on that one but I'm definitely not one to shy away from a challenge! Anyway.. The "trunk lines" leading in/out of the boiler are getting REAL hot.. No problem there. The gage on the front of the boiler reads approx. 25 lbs. and 190-200 degrees F. This is probably above the intended maximums of the system, as the relief valve is dripping. The pump motor is turning, and presumably functional. I'm assuming all the pipes are hooked up properly, but that can't be taken for granted as there is some construction going on in the house and much of the copper tubing does look to be new. Further complicating the problem is the fact that this guy, nor his family, speaks much English! Unfortunately I don't speak Bengali (the language spoken in Bangladesh) so I'm pretty much on my own trying to figure out the situation.. I tried tracing the path the water travels in, but I got a bit confused.. There are brass "Tees" in the main pipes that upon further examination may not actually be a Tee like I'm used to.. It looks like one leg of the Tee might actually be closed or atleast greatly restricted?! The main symptom is that the pipes that branch off the "trunk" and go to the baseboard radiators upstairs are cold. It doesn't appear that there is any circulation through the plumbing above the basement. I've googled a few older threads on baseboard heat and think that air must have entered the system somehow, and must be bled out before he'll get any heat. Am I on the right track with this? If so, could someone briefly go over how this is (safely) done? It appears that there is some sort of cap/plug in the water line, close to each baseboard radiator. Do I need to open these? Should this be done with everything running? One of my concerns is, as this is a pretty OLD system and the plugs are pretty crusty, that I'll crack one open and not get it to seal up properly when I'm done. I guess that's just a risk I'll/he'll have to take though! Anyway thanks again for any replies, I do hope I can help this guy out, as the company doesn't pay the hourly workers much and I try to help them out as much as I can! |
#2
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Please help me troubleshoot a residential hot water heat system!
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#3
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Please help me troubleshoot a residential hot water heat system!
wrote in message Anyway.. The "trunk lines" leading in/out of the boiler are getting REAL hot.. No problem there. The gage on the front of the boiler reads approx. 25 lbs. and 190-200 degrees F. This is probably above the intended maximums of the system, as the relief valve is dripping. The pump motor is turning, and presumably functional. Is there a coupling between pump and motor? Could be the motor turning and the pump is not. |
#4
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Please help me troubleshoot a residential hot water heatsystem!
Running 200f and having the pressure relief dripping is worisome, the
relief valve could be bad giving higher pressures than the unit was designed for. I would first lower the temp to 140 till you have it figured out, it isnt cold out yet.. Look for air bleeders on radiators after you are sure it has enough water, bleeding while it is running under pressure. He needs a pro to go over the system, there could be alot of issues. You may be handy and get it working but are taking on liability working on something you don`t know. |
#6
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Please help me troubleshoot a residential hot water heat system!
One simple thing to check for also that I had to run into in my last
house with a hot water system: Check the return lines where they join back up with the main return "trunk". Somewhere near there may be a balancing valve. Probably looks like a ball valve but might not have a handle and would be turned by a large flat screwdriver. If someone's been "adjusting" these, they could very well have closed off some of the branch loops. There may or may not be these valves here or on the supply end of the individual loops. Just something quick to check for before you start tearing your hair out. |
#7
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Please help me troubleshoot a residential hot water heat system!
Once again, thanks all for your help. I'm glad I waited to ask before
doing anything.. I might have messed with the wrong fitting and caused us all a lot of grief! On one end of the finned-pipe "radiators" is the fitting that I described.. Under all the crusted sediment, it looks like there is a hex cap on top that I thought might be to bleed it out. On the *OTHER* side, however, is something much like Paul described: It has a square-drive stem on top, much like a commerical/institutional water valve. I think THAT is where I should bleed it out (after I go to the plumbing store and get a "key") And I'll remember to take the WD40 with me! As for if the pump is really turning or not.. Well, I can't vouch for there actually being water flow in the pipes, but the intense heat in the main "trunk" indirectly suggests to me that the water is flowing under pressure. The steep temperature gradient in the branch plumbing makes me thing there's something else wrong other than overall lack of system flow. The temperature goes from too-hot-to-touch to room-temperature over 2 feet of pipe. The entire run of trunkline is in the "too-hot-to-touch" range |
#8
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Please help me troubleshoot a residential hot water heat system!
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#9
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Please help me troubleshoot a residential hot water heat system!
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#10
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Please help me troubleshoot a residential hot water heat system!
In-line...
wrote in message oups.com... Hello and TIA, I've been asked by a coworker to help figure out why his house is not getting any heat. Maybe the word got out that I've installed a few forced-air furnaces, or maybe he just thinks that because I'm the supervisor of a skilled trades dept. I must be somewhat handy! Well, the jury's out on that one but I'm definitely not one to shy away from a challenge! Anyway.. The "trunk lines" leading in/out of the boiler are getting REAL hot.. No problem there. The gage on the front of the boiler reads approx. 25 lbs. and 190-200 degrees F. This is probably above the intended maximums of the system, as the relief valve is dripping. The pump motor is turning, and presumably functional. I'm assuming all the pipes are hooked up properly, but that can't be taken for granted as there is some construction going on in the house and much of the copper tubing does look to be new. Further complicating the problem is the fact that this guy, nor his family, speaks much English! Unfortunately I don't speak Bengali (the language spoken in Bangladesh) so I'm pretty much on my own trying to figure out the situation.. Can't help much on the langauge barrier, but I may be able to help otherwise. The dripping releif isn't a good sign. I tried tracing the path the water travels in, but I got a bit confused.. There are brass "Tees" in the main pipes that upon further examination may not actually be a Tee like I'm used to.. It looks like one leg of the Tee might actually be closed or atleast greatly restricted?! Could be a mono-flow system. Do the tee's have a ring on them? Are the tees more or less below the radiators? The main symptom is that the pipes that branch off the "trunk" and go to the baseboard radiators upstairs are cold. It doesn't appear that there is any circulation through the plumbing above the basement. I've googled a few older threads on baseboard heat and think that air must have entered the system somehow, and must be bled out before he'll get any heat. Am I on the right track with this? You could be. I've heard of a lot of systems seem to let a lot of air int he system, but I've never seen one like that. Do you know, for sure, that all the valves are open and the circulator is running? The hot pipes near the boiler being cool further away make me wonder. If so, could someone briefly go over how this is (safely) done? It appears that there is some sort of cap/plug in the water line, close to each baseboard radiator. Do I need to open these? Should this be done with everything running? One of my concerns is, as this is a pretty OLD system and the plugs are pretty crusty, that I'll crack one open and not get it to seal up properly when I'm done. I guess that's just a risk I'll/he'll have to take though! I'm guessing you have manual air vents. Be very careful because they might not seal back off if you open them. If they are crusty, that could mean they were leaking slightly to begin with. Anyway thanks again for any replies, I do hope I can help this guy out, as the company doesn't pay the hourly workers much and I try to help them out as much as I can! You can also try the Wall. http://forums.invision.net/Main.cfm?CFApp=2 |
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