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Low pressure Saunier Duval therma condens boiler

I'm trying to repressurise the boiler after it has dropped below the working point. I'm trying to turn the two blue valves on the bottom but can't get either of them to move. Any advice?

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May need to replace valves (appear to be corroded and plugged with deposits) and install a water conditioner in the inlet line if you have hard water.

Posted on May 19, 2013

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: How do I increase the water pressure on the saunier Duval boiler?

not enough infromations give more detail

Posted on Dec 09, 2009

aquaman987
  • 927 Answers

SOURCE: Hi, Got a Saunier Duval Thema

http://www.saunier-duval.co.uk/manuals/pdf/noncurrent_products/installation_ThemaF23e-SBF23e.pdf

Here are complete instructions for installation and service including purging air and refilling. One of the first suggestions is that service is to be referred to a competent technician.

Gary

Posted on Dec 18, 2010

  • 7 Answers

SOURCE: Hi, I have a Saunier Duval? Theilea twin 28e

You may want to check the Pressure Reducing Valve On the supply line to the building. Easiest way to check is get a guage that hooks up to your hose bib (usually found in the sprinkler section at your hardware store). If your pressure is getting above 80, you need a new PRV.

Posted on Feb 14, 2011

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Appear to be corroded/plugged inlet valve. De-pressurize system and check inlet valves and line.

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It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

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this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

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1 Answer

Hi, I have a Saunier Duval? Theilea twin 28e


You may want to check the Pressure Reducing Valve On the supply line to the building. Easiest way to check is get a guage that hooks up to your hose bib (usually found in the sprinkler section at your hardware store). If your pressure is getting above 80, you need a new PRV.

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Hi, Got a Saunier Duval Thema F 23 E and need to repressurise it (currently at 0 bars). can you provide any help on how to do it? Thanks.


http://www.saunier-duval.co.uk/manuals/pdf/noncurrent_products/installation_ThemaF23e-SBF23e.pdf

Here are complete instructions for installation and service including purging air and refilling. One of the first suggestions is that service is to be referred to a competent technician.

Gary

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