Follow up to previous post

JWalsh32

As a follow up to my previous post about a radiant heat system I installed, I’m realizing now that I believe I misinstalled the mixing valve gaskets. The mixing valve came with 2 gaskets with screens that have deep pockets to catch debris and one flat gasket for the mixed side. I believe I put the ovaled side of the screen pushing into the valve which is holding the check valves open and giving me hot water on the cold side of the valve. I’ve attached photos. I looked through the literature that came with the valve but it doesn’t say anything specific about the orientation of the gasket. Let me know if you guys think this would be enough to hold the check open. Thank you.

IMG_4636.jpeg

IMG_4635.png

Jamie Hall

Could be. Worth taking apart and fixing right, anyway. The screens are domed that way to let debris slide to one side and not block the flow (too fast anyway…).

bjohnhy

Those screens, in theory could prop open the check, but that would not give you the problem you describe with no flow out of the mixing valve and no flow through the circulator.

I would be more suspicious that the screens are clogged.

hot_rod

you really don’t need either the screens or checks in a hydronic application.

The checks are for compliance to the ASSE 1070 listing, for an “anti scald” DHW application.

Thermostatic mix valves have low cv to start with, any spec of debris in the screens will reduce the flowrates even further