Head adjustment Danfoss-How to increase the small adjustment range?

Question

Hello. I have such a danfos My problem is that it heats only between the last range, i.e. between 4 lines and max. Regulation on such a short range is almost impossible or minimal, imperceptible (hot radiators). From minimum to 4 lines, cold radiator. How to set a larger range of temperature...

Zbigniew Rusek · Accepted Answer

It is worth checking the operation with a room thermometer (place it in close proximity to this head). If the thermometer shows more than +23 degrees, the head should start to close the hot water supply to the radiator (gradually close it) and if the temperature was still 2 degrees higher - it should COMPLETELY CLOSE THE FLOW. You can try that. Set the head to 3 lines. Open a window (if there is one near this head - especially when the field is really cold). If, after keeping the window open for a long time, the radiator starts to heat, it means that the head is active and has let the heating medium flow to the radiator. If not - you need to remove the head and check how the initial setting is set. If the value is very small (e.g. 1), the radiator may not heat at all. So you need to raise this setting a bit (by 1 number). Alternatively, put the pre-setting ring to the N position to temporarily give maximum water flow to flush the valve (then return to the previous setting or slightly higher than the previous setting, as maintaining the N setting may cause interference with heating on upper floors.

wawrzeczko_t · Answer

Probably - the head is suitable for replacement (or a blockage at the connection of the galvanized reduction with brass causes the thermostat to malfunction. Or maybe it's these 2 kg of hemp wound on a 1/2 thread?!)

niewiem1979 · Answer

The photo of the head is only a preview, it's not mine, but the same .... I don't have so much hemp. I doubt it to spoil it because I have 3 such heads and they all behave the same as I described. I suspect some internal orifice, something about it did it touch the ears?

mirrzo · Answer

So you have so much heat in the apartment that the head does not allow the medium to flow to the radiators.

niewiem1979 · Answer

Strange reasoning. The apartment is warm so I want to reduce the temperature but not close the valve! I mean something opposite to what you wrote .... the point is that if I reduce below these 4 dashes, the radiator gets all cold .....

wawrzeczko_t · Answer

Initial setting on the thermostatic valve, under the head (if it is possible to make one), should not cut off the flow (inflow) of the medium to the radiator anyway. Unless the valve is dirty/calcified. You have to remove the head, dismantle the valve and clean it ...

niewiem1979 · Answer

I don't think I will download a manual for this ??? valve in winter. There would be a deluge ....

mczapski · Answer

In my opinion, the task of the thermostatic valve is to cut off the flow of the medium after exceeding the set temperature. And according to the description, he does. So, is it about obtaining other effects, or about not maintaining the set temperature in the room? On the one hand, we read that the valve closes the medium inflow, and on the other hand, that the room temperature cannot be adjusted downwards. Something doesn't suit me. If you have doubts about the operation, you remove the head and check the functioning of the valve itself (but you yourself write that it works). You probably do have a limitation on the pre-adjustment, but that's what was set for the installation.

That's it. After all, the valve is used to regulate the temperature of the environment, not for fun. Which of course does not mean that it works properly.

Buddy tetrode. We do not know whether the issue concerns a cooperative apartment.

niewiem1979 · Answer

I'm slowly starting to understand that below these 4 lines - when the radiator is cold, it will turn on only after the temperature in the room drops to certain values, e.g.: 3 lines 20 degrees, 2 lines 17 degrees, etc. Is it right??

Anonymous · Answer

Report the matter to the administration.
Making modifications and adjustments on the installation yourself, which is prohibited.
The installation is owned by the Cooperative.

Of course, it doesn't have to be a cooperative block. It may be a private tenement house, which does not change the fact that changing the setting of the thermostatic valve is the right of the owner of the building (installation) and not the user. This usually causes more serious difficulties in enforcement against the owner, but he is also obliged to react. Is it our friend who owns this tenement house?

Grzegorz Siemienowicz · Answer

Exactly, If it is too hot in the room (the preset temperature is reached), the valve closes the circuit. It will only open when the temperature drops. If you set it to, for example, 2, it will now be closed, but .... if you open the windows in the room and cool them down, it will open. It's just a normal thermostat.

niewiem1979 · Answer

How to remove these heads?

Grzegorz Siemienowicz · Answer

Unscrew the nut and slide it out but why do you want to take it off?

niewiem1979 · Answer

For this.

Grzegorz Siemienowicz · Answer

Your head works ...... it lets the CO factor through when the temperature set on the head is higher than the temperature in the room and does not let through when it's the other way around, so I don't see the need to take it off.

niewiem1979 · Answer

I'll clean it prophylactically or something.....

Grzegorz Siemienowicz · Answer

What do you want to clean? A mechanical head or a hydraulic valve it controls? If you have a hydraulic valve, you have to drain the water from the riser, and the neighbors probably won't like it .

niewiem1979 · Answer

Mechanical head. Now I am doing an experiment with measuring the temperature at the head and inside on 4 and then on 3. I will give the results in a while.

Added after 38 [minutes]:

First reading: danfoss set to 4 lines temp in room 22 sensor glued to the head shows 26

Added after 11 [minutes]:

the second reading on 3 lines of temperature in the room 21.5 temp at the head 24

Added after 2 [minutes]:

I realize that the value of indoor readings is unreliable in such a short time. In addition, the apartment is open practical lack of doors.

Added after 3 [minutes]:

tetroda wrote:
Report the matter to the administration.
Making modifications and adjustments on the installation yourself, which is prohibited.
The installation is owned by the Cooperative.

I think the valve is mine....

mirrzo · Answer

This is just what I wrote. Now you have understood that your apartment is too warm.

wisko1963 · Answer

Well, I have a different problem. Although the room temperature is 24 degrees, the Danfoss head (I don't know the type but it is about 15 years old) does not cut off the water at all. Unless set to 1-2. Something is wrong.

niewiem1979 · Answer

I have another question because I noticed that 2 radiators with heads up heat very differently and unevenly. However, 1 radiator with the head placed lying towards the room, the radiator heats strongly and evenly over the entire surface. I know that's how it should be these heads be mounted. I wonder why?

Anonymous · Answer

The head should be mounted horizontally. Although uneven heating of the radiators can be caused by air in the radiators.

niewiem1979 · Answer

I know it's horizontal but why?

saskia · Answer

So that the flowing medium does not heat the head, because then the range of its operation changes. She is to receive the air temperature, not the heating medium.

mirrzo · Answer

Most likely the bellows was damaged. Time to replace the head.

niewiem1979 · Answer

Can only the top part be replaced? Should you also replace the one mounted directly on the pipe (with a union, threads, you know what's going on?)

mirrzo · Answer

Replace only the head, top as you specified. Take the old one to the store and let them sort it out.

jhosef · Answer

I'll dig up the corpse

How to disassemble this type of head? Mine are not screwed on, they just have a black ring. I would like to replace two because they are not working properly. Are they broken? That is, they do not hold the valve rigidly. One only works on/off. Just toss it on 1 and the heater bangs like mad all the time.

piekarz12 · Answer

Hello, I also have a Danfoss thermostatic head (I took it from an old cast iron radiator). Replaced with a new type of radiator about 2 years old and I have the following situation:
when set to 1 - it heats me for about 10 minutes, then the radiator cools down and does not turn on anymore.
same thing happens with setting 2.
On setting 3 it heats all the time no problem
with settings on 4, I do not see a difference in heating from setting 3, although I remember that when I used the radiator a year ago, each higher value made the radiator louder and louder.

My question is why can't I set the heating to 1 or 2 and keep it warm all the time, it only turns off and cools down?
Regards
d

Head adjustment Danfoss-How to increase the small adjustment range?

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