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Old 02-16-2014, 03:47 PM   #16
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Loud noises from one zone of Hot water heating system


Disconnect one of the return springs on the basement valve.

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Old 02-16-2014, 08:46 PM   #17
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Loud noises from one zone of Hot water heating system


More than likely the basement valve is closing while the upstairs zone is still calling for heat. What you're hearing is water hammer in the basement piping which is caused by a sudden stop of the flow.

They make slower acting valves that close very slowly that would stop the noise. The valves you have now are "usually" spring loaded closing. Once the thermostat in the basement is satisfied the power is removed from the small motor that holds the valve closed and the spring quickly shuts the valve setting up a shockwave along the length of the piping.
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Old 02-16-2014, 09:00 PM   #18
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Loud noises from one zone of Hot water heating system


I second it.
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Old 02-17-2014, 09:03 AM   #19
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Loud noises from one zone of Hot water heating system


Quote:
Originally Posted by old_squid View Post
More than likely the basement valve is closing while the upstairs zone is still calling for heat. What you're hearing is water hammer in the basement piping which is caused by a sudden stop of the flow.

They make slower acting valves that close very slowly that would stop the noise. The valves you have now are "usually" spring loaded closing. Once the thermostat in the basement is satisfied the power is removed from the small motor that holds the valve closed and the spring quickly shuts the valve setting up a shockwave along the length of the piping.
Interesting....I'll mention again that it only happens some of the time. I was checking last night and watched the valve when it shut. It was a slow gradual closing, like the first option you describe. And if I'm remembering correctly, the upstairs zone was still open at the time.

Hopefully I'll have time today to play with the manual controls on the valves (just found those last night) and try to replicate. In the mean time, any other thoughts or responses?
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Old 02-17-2014, 09:37 AM   #20
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Loud noises from one zone of Hot water heating system


It may be that the zone valve is giving you a "warning" that it's going to become a headache. Until you can actual duplicate it or it does it several times where you can get a handle on it, It would just hang on. I"m I correct in that it looks like the zones are piped differnet sizes? 1-1" and the other 3/4" / It almost looks like it branches off from 1 to 3/4 and back to1"? Are you 100% sure it's the heat and not something else in the house. Does it happen certain times of the day or night or is it random? certain days of the week or any day.
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Old 02-17-2014, 09:43 AM   #21
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Loud noises from one zone of Hot water heating system


I'll admit I've been out of the game for a little while and things change, but are those valves closed on either side of the backflow preventer? and where is your automatic feeder located. I can't seem to find one in any of the pictures?
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Old 02-17-2014, 09:46 AM   #22
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Loud noises from one zone of Hot water heating system


does this heating system have or require any type of an expansion tank?
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Old 02-17-2014, 09:47 AM   #23
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Loud noises from one zone of Hot water heating system


Quote:
Originally Posted by old_squid View Post
The valves you have now are "usually" spring loaded closing. Once the thermostat in the basement is satisfied the power is removed from the small motor that holds the valve closed and the spring quickly shuts the valve setting up a shockwave along the length of the piping.
But this is why these valves are directional. When the call for heat is done the motor shuts off and spring pressure acting AGAINST the flow of water closes the valve slowly and smoothly. If you put them in the wrong way (or there is a reverse flow for whatever reason), the flow will act WITH the spring and slam them shut.

@op
Interesting... I notice in the bottom picture the cross flow (bypass) valve is off. Is your pump wired to shut off when both valves are closed or does it run full time?
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Old 02-17-2014, 09:58 AM   #24
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Loud noises from one zone of Hot water heating system


another thought- make sure arrow on circulator housing is pointing in the same directions as zone valve. I may have been wrong on pipe size could be picture distort, but they look bigger than 3/4" What type of heating "units" are they supplying: fined hydronic baseboard, cast iron baseboard, radiators? Is it a looped system where the hot water goes from the boiler to the first unit and then comes out of that one and on to the next or is there a loop run around the basement and back to the boiler and the water for the units is drawn off by mono-flow tees?
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Old 02-17-2014, 10:01 AM   #25
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Loud noises from one zone of Hot water heating system


Wow....lots to respond to here:

@hpyjack:
-Yes, absolutely sure it's the heat. No rhyme or reason to time of day/week/etc. But when the basement zone is on, to this point it's happened max 4 times a day, not every time it shuts off.

-Zones are piped differently. Upstairs is 1" for the first few feet, the has a T down to two 3/4" lines. Basement stays 3/4" the whole time. There is no change in pipe size aside from the T.

-The valves on either side of the backflow are closed. I don't know what an automatic feeder is. If I'm understanding your question, I'll respond by saying that it's a closed system. The only way new water is introduced is manually using those 2 valves by the backflow.

-Yes, there is an expansion tank above the boiler.

@BobSanders
-I've never understood crossflow/bypass. When the boiler was installed last year, that's how it was set up. I asked a quick question about it at the time, but don't recall the explanation I was given. I do know that the pump does not run all the time...it shuts off when both zone valves are closed.
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Old 02-17-2014, 10:03 AM   #26
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Loud noises from one zone of Hot water heating system


@op
Interesting... I notice in the bottom picture the cross flow (bypass) valve is off. Is your pump wired to shut off when both valves are closed or does it run full time?[/QUOTE]

where is the circulator control located? it looks like it is wired directly to the "service" switch.
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Old 02-17-2014, 10:07 AM   #27
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Loud noises from one zone of Hot water heating system


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Originally Posted by hpyjack2013 View Post
it looks like it is wired directly to the "service" switch.
So the pump is running all the time, even when both zone valves are closed (no call for heat)?
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Old 02-17-2014, 10:09 AM   #28
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Loud noises from one zone of Hot water heating system


http://www.watts.com/pages/_products...s.asp?pid=3423
automatically keeps water in boiler and maintain water pressure
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Old 02-17-2014, 10:11 AM   #29
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Loud noises from one zone of Hot water heating system


Quote:
Originally Posted by hpyjack2013 View Post
another thought- make sure arrow on circulator housing is pointing in the same directions as zone valve. I may have been wrong on pipe size could be picture distort, but they look bigger than 3/4" What type of heating "units" are they supplying: fined hydronic baseboard, cast iron baseboard, radiators? Is it a looped system where the hot water goes from the boiler to the first unit and then comes out of that one and on to the next or is there a loop run around the basement and back to the boiler and the water for the units is drawn off by mono-flow tees?
-finned baseboard units

-yes, a looped system. Basement zone is one loop, upstairs would perhaps be counted as 2 (the T junction as described in my previous post)

-I don't see any arrows on the circulator. it's pretty close to the boiler unit, so it it's on the back side, I can't get a good view.

=====
Another observation: When a zone valve opens and the circulator pump gets going, the water flows in the opposite direction of the arrows on the zone valve bodies. The arrows are pointing down towards the floor, but I can tell based on how the pipes heat up that the hot water is flowing up towards the ceiling. Not sure if it means anything, but I find it counterintuitive.
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Old 02-17-2014, 10:11 AM   #30
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Loud noises from one zone of Hot water heating system


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So the pump is running all the time, even when both zone valves are closed (no call for heat)?
No. it is not running all the time. Only when zone valves are open.

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