Identifying and Understanding Older Danfoss Thermostat Model and Functions

Hello.
The product I am interested in is probably no longer produced and Danfoss does not have an "Archives" list on its website
I am looking for the name/symbol of the thermostat and instructions for the model in the photo below,
or (more broadly) information about what the knob visible around the Danfoss logo is for?

Danfoss. The knob has a smooth heating control and there are dash marks ranging from one line to four lines. Setting the knob on four lines results in the highest operating temperature of the radiator and the highest flow of hot water through the radiator. It is a thermostatic valve, so when you set the knob according to the thermometer room temperature to 20 degrees in the room, the regulator will maintain the set temperature in the room all the time. When the valve is closed in the full position by turning the knob to the right, it closes the heat flow to the radiator. When the temperature in the room drops to +7 degrees C, the valve opens automatically, heating radiator, protecting it against freezing.

Added after 12 [minutes]:

When installing this type of valves, you should follow a certain regime in the winter. Before airing the room, close the valve on the radiator. After airing, close the window and set the knob to the dash marks as previously set. Do not leave the window open in the room during the winter, because as the temperature in the room drops, the valve will automatically turn on, protecting the heater against freezing. It heats up to pain. Failure to follow this rule causes a headache when you receive the bill for the consumed heat.

Thank you,
what you wrote and what I found regarding action thermostatic valve explains why yesterday some radiators were warm, lukewarm or almost cold, but the apartment was still warm.

I'm not sure if I defined clearly what exactly I was asking about earlier, the knob actually has 4 levels of regulation and the fifth one is full, I mean the knob (in purple) on the front

It only rotates to the left and I don't really know what it is for.

We moved into a new apartment with such thermostats... the radiators on which I changed the knob setting yesterday do not heat today (the heating regulation on the lines is the same as yesterday)

When you set the thermostat knob to about 18 degrees C and the weather conditions are bearable and the temperature in the room is also the same, the thermostat closes the heat flow. Each heating node has electronics that regulate the supply of hot water to the building. On the wall of the block, in a shaded place, there is a sensor called a weather monitor that measures the temperature outside the building and during the heating season controls geared motors that control the operation of valves depending on the ambient temperature outside the building. Note that during the day, when the ambient temperature is positive, the radiators in the Danfoss apartment are cold regardless of the setting in the Danfoss apartment. In the evening, when the temperature drops, a signal comes from the sensor and the gear motors automatically open the valves in the heating hose located in the basement of the block and the building is heated.

This purple ring is only used to optically mark the favorite (most frequently used) setting. Turning this dial does not change anything in the operation of the head.

but I have a question, I'm looking for an answer everywhere and I can't find if any of you know the designation of these lines, in terms of what temperature to maintain in the room, set on the thermostat for a certain number of lines...
Regards.

I have the same valves, but they don't seem to work properly for me. I set it to position III and the room temperature is about 21C. Still, the radiators are warm. Do valves of this type stop functioning, e.g. due to age? I think mine are over 10 years old.

This contraption is mechanical, based on the expansion of some wax or liquid. He has his mistake. Your room is not perfect either, place the thermometers in different zones and you will see. And put two or more thermometers next to each other and you will be even more surprised. Set it so that you are warm. If you lower it a little every day, you will get used to 19 degrees. Those who had CO for coke or other solid fuel have it the worst. When they switch to gas, they cry. they got used to 24 degrees and are constantly too cold, only the gas bill breaks the habit...

Hello! I have the same thermostats and yesterday in one room, despite the setting at 0 - 6*C, the radiator went to the maximum when I opened the window. I disassembled and cleaned the head as much as possible, but I doubt it will help. It is most likely defective.

Therefore, I have a question: do you know if it is possible to buy a regular knob instead of a thermostat that will fit the valve? Generally speaking, the point is that we have electronic dividers and we don't want to heat because then there are surcharges of PLN 1,000 or more (in blocks of flats, people have their radiators turned off and heat with stoves because the gas is billed per block - that's Poland). I just want to be sure that when I leave the house and leave the window open, no radiator will heat up to maximum capacity like yesterday. Thanks in advance for your answer.

The thermostat sensed cold air from the window and turned on the heating (the gas-filled bellows shrank due to the draft from the window). Who knows if the head is defective. I have such heads, but with this setting, opening the window would not result in the maximum speed. (theoretically, it is a setting of +6 degrees, and outside temperatures are now slightly lower, if not similar, during the day. By the way, when leaving the house, the windows are closed (at least for safety). Instead of a thermostatic head, there are hoods for these valves that can be screwed on on the valve. By closing the hood all the way, the heating is turned off, and by unscrewing it, it is turned on (these are small red caps). By the way, in these thermostatic heads there is a bellows filled with GAS, which expands or contracts due to temperature changes (not any wax).

Thanks for the answer. I'll get these red caps. Of course, I don't open the window wide, I just tilt it from the top, and since I live on the second floor, it's not dangerous. Moreover, it is only left for short trips such as the store or a walk. Yesterday it was only slightly ajar, so I assume that the basket head is suitable since the radiator was running at maximum.

Hello,

I will join in on this topic. I have similar thermostats installed throughout my apartment. My problem is that the knobs are incorrectly set (as if they were turned), e.g. when I turn them, they are not on the blue pictogram, but on the red one, etc. Due to this problem, I have to set everything by sensor. Can anyone tell me how to remove the plastic knob so I can set it correctly?

Regards

Can anyone help? I'm trying different things, but I can't remove the plastic casing...

To remove the thermostatic head (the white knob), unscrew the nut securing the head to the valve with a wrench (probably size 32) (if it is sealed, then you would have to remove the seal with the date, but very carefully, so that you can then put it back on photos of the head could be seen, but they are usually not sealed). To reinstall the head, it should be set to max. heating (to the red pictogram) and with this setting, place it on the valve so that everything fits together and then screw on the large nut. Setting to max. for mounting the head is important because then the mushroom head inside the head is screwed in deeper and makes it easier to properly place the head on the valve. After installation (and tightening the nut), turn the knob to the position ensuring the expected temperature in the room.
PS I have identical thermostatic heads.

Thanks for the help. I understand that someone simply installed the head incorrectly? I hope water won't spray out if I take this head off?

SambaDancer wrote:

Thanks for the help. I understand that someone simply installed the head incorrectly? I hope water won't spray out if I take this head off?

You reason well. Water won't spray out - don't worry.

Hello
I also have such a valve, but the question concerns the steel cable, probably 0.5 mm, which is connected to the valve and then to a small white box on the wall (only in the kitchen, there is no such cable in the rooms). Does anyone know what it is for? And can it be dismantled? probably the RTD3100 head

This means that you have a different valve in the kitchen, one with a capillary.
This is not a steel wire, but a capillary tube, and this box contains a reservoir of the working liquid - the pressure and volume change with temperature and act on the bellows in the valve knob next to the radiator.
NO, it cannot be disassembled - if you break the capillary or cut it, you can throw the head away
If you want to get rid of it, you need to buy a head without a capillary - the one you have in other rooms or its replacement.

I'll join the topic if it's not a problem, because I don't want to start a new topic on something trivial.
The season is about to start and you need to turn the radiators all the way up to prevent air from getting in. I have never lived in a block of flats and I have some problems with marking the knob. Can someone tell me if it was unscrewed correctly? I'm wondering if I need to click IIII or the last red symbol, which I don't know what it means is this last symbol a closing valve or the highest temperature? thank you for your answers and best regards.

goskaa696 wrote:

you have to turn the radiators all the way up to prevent air from getting in

Not necessarily, turn it to 2 and there will be no air. Rule: unscrew to the right, tighten to the left.

goskaa696 wrote:

whether the last symbol is the closing of the valve or the highest temperature

The highest.

The administration wrote to turn it to the highest setting, but if that's what you're writing, it's ok, thank you for your answer

goskaa696 wrote:

The administration wrote to turn it to the highest setting, but if that's what you're writing, it's ok, thank you for your answer

Maybe that's why they wrote that they would fill the installation before the heating season (if the water was drained from the installation - it usually is not drained). The idea is to let air come out of the radiators during filling (the valve must be open for this, and if it is not fully open, e.g. the sun may warm the room enough for the thermostat to close the flow).

Added after 4 [hours] 7 [minutes]:

brofran wrote:

goskaa696 wrote:

you have to turn the radiators all the way up to prevent air from getting in

Not necessarily, turn it to 2 and there will be no air. Rule: unscrew to the right, tighten to the left.
It turns left, it turns right. In the technique, "clockwise" means clockwise. The valve is unscrewed/screwed like nuts or bolts (right-hand thread).