What is this on my boiler?
#1
11-11-18, 10:37 AM
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What is this on my boiler?
I think my circulating water is not hot enough and the house is not heating well. We've had this boiler for about 10 years with no problems. it is a peerless PDE gas fired boiler. There is this plumbing on the side of my boiler and I think the problem is in the item indicated on the attached image. The temperature drops about 50% from one side to the other. I think this is some kind of bypass vale but I am not sure. Not knowing what the inside looks like I don't know what to expect on temperatures. Please help if you know what this is.
Thanks
Jim
Thanks
Jim
#2
11-11-18, 11:25 AM
Group Moderator
Welcome to the forums.
I'm not the pro in this forum. Just looking in. Excellent picture.
That is the return side of your water loop. That means the hot water leaves from the top of the boiler and returns there. That also means that the water temperature there should be lower than the boiler. I'm not sure what that device actually is called. I can see an air bleed and what looks like a water level sensor.
It sounds like you have a circulation problem and it may come down to air in the system.
What is the pressure on the gauge ?
The pro members will be by and offer further help.
I'm not the pro in this forum. Just looking in. Excellent picture.
That is the return side of your water loop. That means the hot water leaves from the top of the boiler and returns there. That also means that the water temperature there should be lower than the boiler. I'm not sure what that device actually is called. I can see an air bleed and what looks like a water level sensor.
It sounds like you have a circulation problem and it may come down to air in the system.
What is the pressure on the gauge ?
The pro members will be by and offer further help.
#3
11-11-18, 12:46 PM
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Thanks Pete,
I finally found out what it is. It is a thermostatic bypass valve made by Taco. A Taco 595. No longer made and no replacement. It has to be bypassed with another valve for a repair. The problem i have now is I can't get the top of to remove the thermostatic element so I can add another valve.
Jim
I finally found out what it is. It is a thermostatic bypass valve made by Taco. A Taco 595. No longer made and no replacement. It has to be bypassed with another valve for a repair. The problem i have now is I can't get the top of to remove the thermostatic element so I can add another valve.
Jim
#4
11-12-18, 03:31 AM
What type of heating units do you have? Do you have finned tube baseboard radiation, cast iron rads, or do you have piping in concrete floor heating? Also, pull the camera back a little so we can see the whole boiler installation. I do not know why you would have a tempering valve on a boiler. Is the side against the boiler piped into the boiler?
#5
11-12-18, 10:31 AM
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Steamboy,
The only thing you would se is the expansion tank and the return lines for three zones.
finned tube baseboard radiation
I do not know why you would have a tempering valve on a boiler
it was on there when I bought it from peerless
Thanks
The only thing you would se is the expansion tank and the return lines for three zones.
finned tube baseboard radiation
I do not know why you would have a tempering valve on a boiler
it was on there when I bought it from peerless
Thanks
#6
11-12-18, 11:05 AM
J,
Just for your own info bypasses are used when you replace a high water content older boiler with a low water content boiler of today to prevent thermal shock.
The older boiler used to have a lot more water in them, as much as 50 gals. where the same BTU boiler today has about 13 gals. so they empty out quicker and go from real hot water leaving to real cold water entering until it levels out.
The bypass tempers the return water so you do not get a boiler full of cold return water into a hot boiler possibly causing thermal shock and possibly causing it to crack.
The same way you would never put cold water into a hot car radiator.
Hope this helps you understand a little better.
Just for your own info bypasses are used when you replace a high water content older boiler with a low water content boiler of today to prevent thermal shock.
The older boiler used to have a lot more water in them, as much as 50 gals. where the same BTU boiler today has about 13 gals. so they empty out quicker and go from real hot water leaving to real cold water entering until it levels out.
The bypass tempers the return water so you do not get a boiler full of cold return water into a hot boiler possibly causing thermal shock and possibly causing it to crack.
The same way you would never put cold water into a hot car radiator.
Hope this helps you understand a little better.
