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Old 02-23-2018, 08:34 AM   #1
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Default Cross over valve

I was on another forum and this term came up I have not heard
of this..... I do alot more commercial stuff this was used in a home
domestic water heater with a pump in a home
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Old 02-23-2018, 09:15 AM   #2
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Originally Posted by geofd View Post
I was on another forum and this term came up I have not heard
of this..... I do alot more commercial stuff this was used in a home
domestic water heater with a pump in a home
Maybe you should explain what this valve does. Becuase i'm sure some of us have heard it by another name.

Is it a mixing valve?
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Old 02-23-2018, 10:38 AM   #3
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Probably referring to recirc system with no dedicated return line, the little block that's installed at the farthest point from the w/h, usually a lav, and it allows the hot to use the cold line for return to w/h. Grundfos has one you install the pump on the w/h and add the block.
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Old 02-23-2018, 11:20 AM   #4
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Originally Posted by chonkie View Post
Probably referring to recirc system with no dedicated return line, the little block that's installed at the farthest point from the w/h, usually a lav, and it allows the hot to use the cold line for return to w/h. Grundfos has one you install the pump on the w/h and add the block.
Chonkie way back ... early 2015 this was a pretty big discussion.

Here is what I said then.Originally Posted by Best Darn Sewer
All this is news to me. I never knew the Grundfos comfort system bypass had a thermal control valve. Even when I've spoken with tech support in the past they just said its a simple check valve. Are y'all sure its thermally controlled? Being the timer on the unit controls the pump why would it be thermally controlled?


The timer on the pump is to turn it on lets say 6:45 A.M. and then turn if off lets say 9:39 A.M. Pump can be turned on and off according to life style. Control valve shuts off when hot water detected at faucet.


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Old 02-23-2018, 01:29 PM   #5
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Quote:
Originally Posted by geofd View Post
I was on another forum and this term came up I have not heard
of this..... I do alot more commercial stuff this was used in a home
domestic water heater with a pump in a home
I read that when there is no return for domestic he
there is a fitting that's installed under a lav (I don't know
how to post pics) when the pump on the water heater is on
it turns part of the cw into a hot return/as soon as a fixture is
used it shuts down that valve and it goes back to it origanal state
I will get the name of the one I found and post it

check out ready temp.com

Last edited by geofd; 02-23-2018 at 01:33 PM.. Reason: More info
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Old 02-23-2018, 02:27 PM   #6
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I remember that discussion. After taking one apart and testing it, we did conclude that it is not just a simple check valve and it actually closes off when the h2o reaches a certain temp. Don't know what the temp is but it happens.

Here's a pic of the block I'm talki ng about geoff.
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Old 02-23-2018, 04:48 PM   #7
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Quote:
Originally Posted by geofd View Post
I read that when there is no return for domestic he
there is a fitting that's installed under a lav (I don't know
how to post pics) when the pump on the water heater is on
it turns part of the cw into a hot return/as soon as a fixture is
used it shuts down that valve and it goes back to it origanal state
I will get the name of the one I found and post it

check out ready temp.com
Thanks chonkie....

that was something else I was wondering thanks for all the info!!!!!

Last edited by geofd; 02-23-2018 at 06:23 PM.. Reason: more info
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Old 02-23-2018, 05:08 PM   #8
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Originally Posted by chonkie View Post
I remember that discussion. After taking one apart and testing it, we did conclude that it is not just a simple check valve and it actually closes off when the h2o reaches a certain temp. Don't know what the temp is but it happens.

Here's a pic of the block I'm talki ng about geoff.
Grundfos comfort system, it's designed to shut off at about 105 degrees. I got a call a few years ago where the homeowners complaint was when she turned cold water on at kitchen sink it was hot for about 2 minutes. A new bypass valve solved that problem.
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Old 06-07-2018, 08:36 AM   #9
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Originally Posted by anytimehvac View Post
A crossover valve is basically a defective or faulty mixing valve that allows cold water into the hot water pipes and/or hot water into the cold water pipes. This type of mixing valve is usually found wherever a hot and cold pipe meets at a fixture in a central heating system.

Next post of yours needs to be an intro. And how is a valve that is designed to allow hot water into the cold side "basically a defective or faulty valve"?
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Old 06-07-2018, 10:19 AM   #10
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