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Heating plumber help

Old 11-10-2019, 10:10 AM
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Default Heating plumber help

Need some guidance on my radiant floor heating actuators. Seems like one of them does not open to let hot water circulate through the floor. I think the actuators i have are discontinued because I can not find an RTI one anywhere. Does anyone know which actuators I might be able to replace these with. Thanks.
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Old 11-10-2019, 10:16 AM
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None of those looks like flooring.

Are you sure you are looking in the proper place?

John
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Old 11-10-2019, 10:34 AM
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Originally Posted by jtburf View Post
None of those looks like flooring.

Are you sure you are looking in the proper place?

John
This was put in 18 years ago by a plumber when we re did our kitchen and bathroom over. 1 zone goes to kitchen and 1 zone goes to bathroom. Def for the floor. I guess this was not the right system that they put in?
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Old 11-10-2019, 11:07 AM
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Strange in looking at that it appears as if the top one goes to the bathtub, picture person sitting in tub. The lower one goes to a shower, picture of shower. I never seen a bathtub use such a thing but it sure don't appear to have anything to do with floor heating.
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Old 11-10-2019, 11:32 AM
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Originally Posted by Bamby View Post
Strange in looking at that it appears as if the top one goes to the bathtub, picture person sitting in tub. The lower one goes to a shower, picture of shower. I never seen a bathtub use such a thing but it sure don't appear to have anything to do with floor heating.
​​​​​​I know for sure it is for the floors, I watched them put it in, not sure what all the stickers are for but when heat is called for from the thermostat the right pump goes on and the pex tubing gets hot and floors warm up.
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Old 11-10-2019, 01:04 PM
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That white wire that goes up and behind the zone valve, You need to disconnect it and make sure the valve is getting power before ordering a new valve. Could have a bad 24 volt transformer.
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Old 11-10-2019, 02:02 PM
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one on the top has a pic of a stove and one on the bottom shows a plate, so maybe those represent the kitchen, the tub and shower are for the bathroom.
yep need tp make sure there is a signal to the ones that do not work to be sure where a problem might be
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Old 11-10-2019, 02:08 PM
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Originally Posted by 99yam40 View Post
one on the top has a pic of a stove and one on the bottom shows a plate, so maybe those represent the kitchen, the tub and shower are for the bathroom.
yep need tp make sure there is a signal to the ones that do not work to be sure where a problem might be
I think you solved the label issue one on the top right goes to bathroom and returns to bottom right shower the top left is out to kitchen floor and bottom left is kitchen return. I have power to both actuators its just not opening.
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Old 11-10-2019, 02:09 PM
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Is there more than one circulating pump? Have you check them?
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Old 11-10-2019, 02:21 PM
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Originally Posted by aubv View Post
Is there more than one circulating pump? Have you check them?
The pump runs when called upon and has hot water up until the actuator and than nothing. The hot water is not getting past the actuator.
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Old 11-10-2019, 02:30 PM
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is there an actuator on both line out and return?
if so are they both energizing?
how have you tested for power?
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Old 11-10-2019, 02:48 PM
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Most actuators have a provision for manual operation.
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Old 11-10-2019, 03:59 PM
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Originally Posted by hevysrf View Post
Most actuators have a provision for manual operation.
Any idea how to manually turn them on.
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Old 11-10-2019, 05:58 PM
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do you have a manufacture name and model #?
how about a manual
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Old 11-10-2019, 06:06 PM
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As a heating contractor, replace the manifold with a newer version and two new actuators. You can unscrew (gray collar in the picture) the one in place now and see if the piston on the manifold moves freely, all the actuator does is move that up and down or on and off. The uponor power head may fit that manifold but the "throw" may not be correct to move it as needed. Its a simple fix but that style manifold I have not seen in years. I believe RTI was once part of Rahau. If you do find them, you need to know if you have a two wire of four wire power head to replace it correctly. If your in Maine, be happy to come over and take a look.
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Old 11-10-2019, 07:17 PM
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Originally Posted by alka2710 View Post
Need some guidance on my radiant floor heating actuators. Seems like one of them does not open to let hot water circulate through the floor. I think the actuators i have are discontinued because I can not find an RTI one anywhere. Does anyone know which actuators I might be able to replace these with. Thanks.

RTI is defunct. Best source I’ve found for some of the discontinued and obscure Hydronic stuff is
Hydronic Alternatives. You can google them up on the www and give them a call.
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Old 11-10-2019, 07:28 PM
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you should be able to swap the control heads to see it the problem moves
that would give you an idea if the head is the problem

also there should be an auto & manual position
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Old 11-11-2019, 08:38 AM
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Originally Posted by Captinlon View Post
As a heating contractor, replace the manifold with a newer version and two new actuators. You can unscrew (gray collar in the picture) the one in place now and see if the piston on the manifold moves freely, all the actuator does is move that up and down or on and off. The uponor power head may fit that manifold but the "throw" may not be correct to move it as needed. Its a simple fix but that style manifold I have not seen in years. I believe RTI was once part of Rahau. If you do find them, you need to know if you have a two wire of four wire power head to replace it correctly. If your in Maine, be happy to come over and take a look.
Thanks for the advice and offer to take a look but a little far away. Might pick your brain if I decide to do it or might have someone do it for me. I am not sure i am comfortable with the draining and bleeding of the system. Thanks again
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Old 11-12-2019, 05:24 PM
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No problem, best of luck to you. Its not that bad of a job. The hardest part would be purging the air back out of system, it all depends on how the rest of the system is set up.. Pm if you have any questions.
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Old 11-12-2019, 06:15 PM
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Sorry I can't say for sure what actuator will be compatible. After doing the typical troubleshooting (confirm voltage to actuator), I would remove it and take it to a local plumbing supply store. I have found, even after doing extensive research or measuring, its often best to just bring in the old part if possible. The actuator "head" should be removable without opening up the heating system.

Edit: Is one zone working, and was it heating at or recently when you took that pictures? Looks like you have 75F going out and 60F returning?
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