logo elektroda
logo elektroda
X
logo elektroda

Junkers ZW 20 KE 23: Daily CO System Refilling, Pressure Drop, Ladder Radiator Issues & Maintenance

karamba26 8748 6
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16317042
    karamba26
    Level 23  
    During the last heating season I had to admit water to the CO system every day. No visible leaks. The flat in the block on the 2nd floor so after that time a neighbor downstairs would notice something.

    I was refilling up to 1.5 bar. Temperature control knob set at 5 or 6 at night. In the morning (pressure which was over 1 bar), after reducing to 2 or turning off the heating, the pressure dropped quickly to 0.
    I allowed water and used it for the last year.

    Recently, the small ladder radiator in the bathroom stopped heating me. The reason was a blocked hose. When the pressure dropped to 0 I disassembled the hose and cleaned it.
    After checking the diaphragm pressure, it turned out empty.
    I closed the valve on the heating flow and return. Through the safety valve I drained the water from the container. I pumped up to 1 bar and drained the water again. I did this several times until the water flowed through the valve. I will add that at the end the water was very dirty, even BLACK.

    I put the shadows in a container to 1 bar. I turned the cap on the valve. I turned on the supply and return what I filled the circuit with 1.5 bar pressure.

    I vented the radiator in the bathroom (it hangs at the highest point).

    All radiators heat, but very quickly (within an hour - no matter if the heating is used or not) the pressure drops to 0

    I add water to the installation to 2 bar and slightly open the safety valve on the diaphragm vessel. I drain water into the container (it is very low - a few ml) until the pressure drops to 0. I fill the system very slowly.

    In the vessel the air pressure was replenished on Friday and yesterday when I was checking the pressure on the valve it was the same as when it was filled (i.e. 1 bar).

    Now I have to get up every 2 hours at night to supplement the water pressure in the circuit.

    What can happen with the water allowed in the system. Why is it good for some time after topping up to 1.5 bar, and then falling to 0 later.
  • ADVERTISEMENT
  • #2 16317065
    cirrostrato
    Level 38  
    There are no miracles, the water escapes somewhere, maybe through the water filling valve in the system.
  • ADVERTISEMENT
  • #3 16317097
    karamba26
    Level 23  
    The water pressure in the network installation is higher than on the furnace in the heating circuit

    If the valve were leaking I would have an automatic increase in pressure in the heating circuit, and for me it drops to zero.
  • ADVERTISEMENT
  • #4 16317989
    tomek3108
    Level 14  
    Is there a place in the apartment where the installation passes through a chimney or assembly shaft where the leak would not be visible? The coil isn't leaking somewhere? If it is a dual function boiler, maybe the plate heat exchanger has been damaged? - Check if pressure drop occurs when hot water is drawn.
  • ADVERTISEMENT
  • #5 16318324
    karamba26
    Level 23  
    I closed the supply and return, which opened the tap with hot water - I did not notice the pressure drop. In addition, I turned off the cold water supply. I open the tap again and the pressure is ok

    Armature in. No leaks.

    I have now 1.5 bar in which I turned off the power and return. I will watch if the pressure drops to zero.

    Added after 12 [hours] 50 [minutes]:

    Yesterday at 19:00 I filled the installation with a water pressure of 1.8 bar
    The supply and return valves have been turned off.

    Junkers ZW 20 KE 23: Daily CO System Refilling, Pressure Drop, Ladder Radiator Issues & Maintenance

    I turned on the heating circuit on the stove (only for a moment to let the water heat up). The temperature quickly rose to 60C (until a strange noise from the oven began to come out). The flame went out, the noise stopped, the circulation pump is working.

    I used the stove normally (bathing, washing dishes and the heating was set every 1). Leakage from the coil cannot be seen. No pressure drops when using hot water.

    At night I turned off the heating every morning on the pressure gauge I still have 1.8 bar

    Is this a 100% leak in the central heating system apart from the shut-off valves?

    Today I will try to make a pressure test on radiators. in place of the vent I will screw in a pressure gauge and see if the pressure drops to 2 bar after filling.

    I have a DGN8 W + P dish
    on the plate there is information about 0.5bar pressure
    I got to 1 bar (isn't it too much)
  • #6 16326601
    serwisszulborski.pl
    Heating systems specialist
    You can lower the pressure in the vessel to 0, 5-0, 75bar so that the boiler can vent better. I think you have a leak on the installation. Install a second pressure gauge max. to 4 bar instead of the vent and close it at night which sometimes leaks come out after a few years of installation work and in one case instead of a neighbor's floor below the leak appeared on the outside wall of the building.
  • #7 16328469
    karamba26
    Level 23  
    I screwed in a pressure gauge instead of a vent. I filled the installation with water up to 1.5bar.

    I closed the heating circuit. After 5 hours I had 1.5 bar on the stove and 0 on the radiator.

    Rather, it definitely means a leak from the installation.

    I am surprised, however, because I have been replenishing water for a year and there are no signs of leakage (apart from the lack of pressure in the circuit).

    Like a stove and what works, this pressure drop cannot be seen so much. This is revealed when the heating is turned off and on a cold installation.

    Installation made 15 years ago in glued plastic. The greater part of her runs under the panels. What to use to easily and quickly locate a leak?

Topic summary

The discussion revolves around issues with a Junkers ZW 20 KE 23 heating system, specifically concerning daily refilling of the central heating (CO) system due to pressure drops, with no visible leaks detected. The user reported that the pressure would drop to zero after being filled to 1.5 bar, particularly after turning off the heating. Various suggestions were made, including checking for hidden leaks in the installation, particularly in areas like chimneys or assembly shafts, and examining the diaphragm pressure and coil for potential issues. The user confirmed that after isolating the heating circuit, the pressure remained stable, indicating a possible leak in the installation itself. Recommendations included lowering the pressure in the vessel for better venting and installing a second pressure gauge to monitor the system more effectively. The user expressed concern over the age of the installation, which is made of glued plastic and runs under floor panels, complicating leak detection.
Summary generated by the language model.
ADVERTISEMENT