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Mike McMillan
May 23, 2021
In Biomass
Offline Posts: 41 Laddomat Problem? « on: November 26, 2020, 11:27:35 AM » We have a Perge log boiler feeding into an Akvaterm tank, via a Laddomat. All has been running well for a number of years, but recently have noticed the boiler overheating/venting, apparently because the Laddomat pump is not starting up. Have found that by adjusting down the flue thermostat, it does cut in (therefore I conclude the pump is ok.), and blends water into the tank as it should, but the thermostat has to be set so low that at the end of the burn cycle it never cuts off - I assume the final stage of circulating hot water around tank/boiler keeps the boiler just warm enough to not trigger the thermostat to cut off the pump. Hope this is clear. Any experts out there recognise the symptoms, and could point me in the direction of what is wrong? Logged www.marbrae.blogspot.com Countrypaul Hero Member Offline Posts: 1974 Re: Laddomat Problem? « Reply #1 on: November 26, 2020, 11:54:41 AM » No expert, but it sounds like your flue thermostat is not performing properly. How long has it been in use and what model is it. May be worth changing based on age and environment it works in given the symptoms. Loggedwinterbourne Newbie Offline Posts: 13 Re: Laddomat Problem? « Reply #2 on: November 27, 2020, 09:15:22 AM » If you boiler is getting to temperature too quickly and all is working well with the pump and flue thermostat then in our experience it will be the thermostatic cartridge that will need replacing in the Laddomat. The standard we usually supply is a 72°C thermostatic cartridge but we have a range from 57°C to 83°C. When the Laddomat is in the mixing phase sometimes the nose of the thermostatic cartridge gets stuck so it is no longer operating like a blending valve and you have too high a return temperature to your boiler. We have seen this many times as we would have over 1000 Laddomats being used in the UK. The price is £28.00 + vat Delivery £5.00 + vat Pretty sure it will solve the problem. Guy Winterbourne Eco Angus Ltd [w] 01934 862642 E-Mail info@ecoangus.co.uk LoggedDaveB275 Newbie Offline Posts: 41 Re: Laddomat Problem? « Reply #3 on: December 11, 2020, 08:09:34 AM » UPDATE. Thanks to those that responded. Replaced the cartridge, but no change. Replaced the flue thermostat and it now seems back to normal. Logged www.marbrae.blogspot.com winterbourne Newbie Offline Posts: 13 Re: Laddomat Problem? « Reply #4 on: December 13, 2020, 09:28:32 AM » I am glad you are sorted and apologies as your original description made me feel that all was working well with the flue thermostat. We keep the flue thermostat 50°C-300°C which is used for log boilers as you have fairly low flue temperatures whereas there is another one 50°-500°C for wood burning stoves. Anyway for the record it is a good thing to change this thermostatic cartridge every 5 years or so as the full range of movement of the nose of the thermostatic cartridge through thermal actuation becomes hindered through time and can cause a lowering in the boiler output. LoggedPages: [1] Go UpMARK UNREAD | PRINT
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Mike McMillan
May 21, 2021
In Wind Turbines
I think I saw 18.2 earlier..17.3 presently https://energynumbers.info/gbgrid
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Mike McMillan

Mike McMillan

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