The central heating furnace pump is aerated and the water in the furnace boils.

Question

Hello. Defro Optima Plus oven mounted for heating a 180 m2 house. This is an ordinary oven without a feeder. śmieciuch. The cycle is short. A differential valve is installed at the exit of the furnace and a pump bypassing this valve and access to the heat exchanger and then return to the boiler....

Magister_123 · Accepted Answer

Draw a diagram or paste photos of the layout.

Sstalone · Accepted Answer

Straight from the boiler from the top from the Dutch to the expansion vessel from above with an inch steel pipe while maintaining the slope to the boiler, i.e. first leaving the boiler to the expansion vessel, and only then going sideways to the existing system with the pump. The easiest way instead of this tee after the Dutch is to screw in a tee such as exit from the boiler through, give a reduction on the top for 1 inch and a pipe to the vessel, and connect the existing system to the side of the tee. Connect the bottom of the expansion vessel to the boiler return, overflow from the side of the vessel to the sink. Here you have described

Henio65 · Accepted Answer

Drain some water, open the venting valve and then extend with a hose and fill it up listening for air leaks.

puchacz2420 · Answer

I took photos of only a small circuit from the exchanger, only pumps for CH, DHW and floor supply.

Sstalone · Answer

The boiler circuit is connected to the expansion vessel? From the return side? Is this a closed system because you write that the pressure drops? What is the power of the central heating boiler? What is the power of the exchanger? What temperature do you keep on the boiler? What temperature do you keep in the radiator circuit at the outlet of the exchanger? The gray tank in the picture is an expansion vessel?

puchacz2420 · Answer

This gray vessel is a balancing tank connected directly to the boiler. Boiler with a thermal power range from 8 to 25 kw. I can't read the power on the exchanger so I will write what I see. .Max work Press (bar) 30, max work temp 230, min work temp -190, test pressure bar 64, volume letters 0.7. There is something else HTA (m2) / weight (kg) - 0.9 / 5.3.

Sstalone · Answer

Then take a photo of the connection of the vessel to the boiler and throw it here.

puchacz2420 · Answer

One more thing ... a leveling vessel connected to the boiler next to the return ... as in the picture.

Henio65 · Answer

The expansion vessel must be connected at the highest point of the installation. Do not measure the height from the oven only at least "1cm" above the highest point of the installation. The pump does not ventilate it just seems so because the system is aerated and the pump works with all its strength.
In addition, the pump may be on the return, it will start working at the right time with a delay when the need arises.

Sstalone · Answer

Dude, you have a bomb at home. Who did this to you? Answer yourself, how and where should steam escape from the boiler while boiling water? Installation for immediate conversion ... connection of expansion vessel.

puchacz2420 · Answer

Ok. As for the tank it is approx. It is about 70 cm above the highest point. I fired and heated the oven to 76 degrees and at 70 the system was announced the pump was running dry. I vented at the pump and keep it going for now. I set the temperature on the boiler 55 degrees and so far nothing is happening. Popale so for 2-3 days and raise the temperature again to 75 I will see if it is announced again. Thanks for help ... greetings ...

Added after 9 [minutes]:

That's right Stallone. Only where to connect this reservoir now. Constantly when it boils water it is thrown out through the reservoir ...

Henio65 · Answer

Drain the water from the system and fill it again. After filling, you already have air in the system because which way it will go out.

puchacz2420 · Answer

OK thanks. Heniu. I will do it tomorrow and write the effect. At the highest point I have a breather valve and maybe it's too weak and it's not enough to replace it with a regular closing valve ... thanks.

puchacz2420 · Answer

Thanks Stallone. I will do it too. In the end I have to find a mistake. pozdr

puchacz2420 · Answer

Hi. Sorry that I did not speak but after the fault I had to leave immediately. The topic is completed. Thanks to Heni for the simple hints and I used it. The stove works like this doll. Thanks also because it really is puzzling but after installing the valve as Henio 65 described everything is ok. In the spring after the season I will do as Sstalone wrote. Wife doesn't complain, the oven doesn't cook. Thanks for you .... Regards.

[Solved] The central heating furnace pump is aerated and the water in the furnace boils.

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Topic summary