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Old 22.01.2019, 22:37
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Underfloor heating question

What are these thingies and how do the work? Clear plastic with a red plunger-like thing on the inside.

Sorry, not a very good picture. It is the things sticking up from the horizontal pipe.
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Old 22.01.2019, 22:41
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Re: Underfloor heating question

They are valves which help regulate the flow of hot water to various rooms (circuits). i'll try and post a link
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Old 22.01.2019, 22:43
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Re: Underfloor heating question

Thank you sva! Any idea how they work? Clockwise to open, or to close?
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Old 22.01.2019, 22:44
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Re: Underfloor heating question

heave a look here
https://www.youtube.com/watch?v=eq1grb5qpX4

search for 'manifold' in underfloor heating - that's what its called
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Old 22.01.2019, 22:46
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Re: Underfloor heating question

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Thank you sva! Any idea how they work? Clockwise to open, or to close?
normallz there are gradations on the glass tube,and a float inside which goes up and down. i'm not sure about direction...
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Old 22.01.2019, 23:07
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Re: Underfloor heating question

Many thanks. I have some tweaking to do.
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Old 23.01.2019, 09:28
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Re: Underfloor heating question

Photo is not clear, but my UFH has these.

Numbers on the side indicate the flow rate of water running through the tubes under your floor. Liters per hr.

When the heating in the particular room reaches temperature as set on your room thermostat, the disc inside the tube will move to the top and thereby closing the valve. In my case I can reduce the temp on the room thermostat and then watch the valve gradually close. This doesnít happen immediately/quickly, so allow a few mins.

Typically you shouldnít need to make any adjustment/changes because these are set by the heating engineer at the time of installation.

However in my case, one of the valves became stuck and would not open. To fix this, remove the plastic ring around the base of the glass tube and here you will find a large nut. Turning this with a spanner, you can increase/reduce the max flow rate for that loop/room.

Unless you are having problems, i.e. cold rooms/spots, donít mess with it.
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Old 23.01.2019, 09:35
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Re: Underfloor heating question

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Unless you are having problems, i.e. cold rooms/spots, donít mess with it.
Depends. When ours was set up they basically had the same flow rate all over. As we want bedrooms to be a little cooler and the bathroom to be warmer I changed the flow rate for those rooms. Worked fine.
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Old 23.01.2019, 09:42
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Re: Underfloor heating question

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Depends. When ours was set up they basically had the same flow rate all over. As we want bedrooms to be a little cooler and the bathroom to be warmer I changed the flow rate for those rooms. Worked fine.
You donít have individual thermostats in each room?
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Old 23.01.2019, 09:49
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Re: Underfloor heating question

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Numbers on the side indicate the flow rate of water running through the tubes under your floor. Liters per hr.
Litres per minute, not hour! One litre per hour isn't going to make your floor very warm...

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You donít have individual thermostats in each room?

Bathrooms don't generally have thermostats and are usually connected to the system by the hallways and these generally don't either.
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Old 23.01.2019, 09:52
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Re: Underfloor heating question

On that floor we have thermostats in the three bedrooms, but not in the two bathrooms and corridors. Those areas are too warm and Iíd like to lower the temperature there.

In the bedrooms Iíd like they system to be more responsive to the thermostats. They have to be fully open to get a reasonable 20 degree temperature.

Thanks for everyone Ďs help. I am going to take better picture before I start so I can get back to the start if necessary.
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Old 23.01.2019, 10:04
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Re: Underfloor heating question

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Many thanks. I have some tweaking to do.
Go steady and only tweak a bit at a time then wait. If they're anything like ours you just have to lay a sodding finger on it and the room goes from fridge to furnace within a day.

However, ours look like they were top-tech on the ark so more modern ones might be less fickle.
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Old 23.01.2019, 10:10
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Re: Underfloor heating question

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You donít have individual thermostats in each room?
Nope. 19 year old heating system.
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Old 23.01.2019, 10:14
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Re: Underfloor heating question

Should be better photo
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Old 23.01.2019, 10:16
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Re: Underfloor heating question

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On that floor we have thermostats in the three bedrooms, but not in the two bathrooms and corridors. Those areas are too warm and Iíd like to lower the temperature there.

In the bedrooms Iíd like they system to be more responsive to the thermostats. They have to be fully open to get a reasonable 20 degree temperature.

Thanks for everyone Ďs help. I am going to take better picture before I start so I can get back to the start if necessary.
Those regulate the flow rate to the individual zones.

Most people who mess with them bugger things up. Record what they were before you start.

The way I proceed is as follows:

Set all the room TStats to the middle of their settings.
Wait for a day until the system stabilises.
Using a thermometer, record the temperature in each room. Note where you put the thermometer in each room.

Raise or lower the temperature in the Unregulated rooms by adjusting
the flow valves accordingly - you want them to be the same, 23 degrees for a bathroom is typical - she might want it warmer (they always do).

Adjust the Regulated rooms to be the same temperature. I normally shoot for 21 Deg at the middle of the Tstat range.

Wait a day, then remeasure to see how badly you've buggered things up.

When you reach the point that the unregulated zones are at a comfortable level, and the regulated zones are all at the same temperature, you're done.

Now you can change the Tstats to raise/lower the regulated zones.

(Don't open windows while you're doing this.)
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Old 23.01.2019, 10:30
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Re: Underfloor heating question

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On that floor we have thermostats in the three bedrooms, but not in the two bathrooms and corridors. Those areas are too warm and Iíd like to lower the temperature there.
Be careful about lowering the temperature in the bathrooms - if they are cooler then the outside walls (if you have any) will get colder and water vapour after a bath or shower is more likely to condense on them with inevitable mould problems occurring.
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Old 23.01.2019, 10:31
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Re: Underfloor heating question

It seems out tstats in each room have zero effect.
If leave all the tstats fully on, 30degrees, there is no difference to when i set the stat to the minimum - ie when i just makes that audible click.

I have a FLIR camera so I'm not just guessing the temps either.

However we do have a nice 21-23 all year round. I think we have some controls under the floor panel of a cupboard but I never bothered to look

*I'm in an apartment so i don't have access to the building controls
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Old 23.01.2019, 10:34
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Re: Underfloor heating question

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It seems out tstats in each room have zero effect.
If leave all the tstats fully on, 30degrees, there is no difference to when i set the stat to the minimum - ie when i just makes that audible click.
I've written this before but one new build had this problem and although the heating engineers assured me that it was just because the system needed time to settle down, my own investigations showed that they had forgotten to wire the thermostats to the mains electricity!

The click is the bi-metallic contact operating the micro switch to turn on the valve and will click irrespective of whether the thermostat has power or not.
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Old 23.01.2019, 10:51
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Re: Underfloor heating question

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You donít have individual thermostats in each room?
We do .

But some rooms- Bathrooms and corridors do not. The reason for this is the heating systems needs to be able to pump water freely around the system. It then measures the temperature of the returned water to know if it need to heat the system or not.
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Old 23.01.2019, 11:01
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Re: Underfloor heating question

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It seems out tstats in each room have zero effect.
If leave all the tstats fully on, 30degrees, there is no difference to when i set the stat to the minimum - ie when i just makes that audible click.

I have a FLIR camera so I'm not just guessing the temps either.

However we do have a nice 21-23 all year round. I think we have some controls under the floor panel of a cupboard but I never bothered to look

*I'm in an apartment so i don't have access to the building controls
You can pick up a laser pointer thermometer ar rhe Landi for CHF19.90.
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