Laddomat 21 For accumulation when using a wood-fired boiler Picture 1 The wood-fired boiler is connected to … …an accumulator tank with by-pass and dwh with... ... Laddomat 21 …and this is how it works...

Laddomat 21 Now it´s time to start the fire Picture 2 The electrical cartridge heats the top of the tank… Picture 2 ...enough to provide hot water... …and heating Now it´s time to start the fire There is no remaining heat from last firing. The boiler and… …tank are cold and are not generating any losses.

Laddomat 21 Picture 3 The electrical cartridge heats the top of the tank for a while until… A fire is lit in the boiler…

…the temperature increases in the boiler Laddomat 21 Picture 4 …the temperature increases in the boiler

Laddomat 21 Picture 5 The flue thermostat heats up… The built-in check valve is kept… …and starts the pump …shut by the pump flow …the water starts to circulate inside the boiler This stops the boiler cooling down during the start-up firing

Laddomat 21 Picture 6 At +78°C, the thermal valve opens… …the tank is being charged with hot water …and cold water from the tank is added …cooling the boiler with pre-heated water

Laddomat 21 Picture 7 A short time after charging begins, the electrical cartridge is shut off by its own thermostat

…until it is completely full Laddomat 21 Picture 8 Thanks to the low flow level, perfect layering is created when the tank is being charged… …until it is completely full

Laddomat 21 Picture 9 The thermal valve ensures that the tank is being fully charged… …the by-pass flow is completely shut down in the final stages The full capacity of the pump cools down the boiler

The fire goes out when the fan or damper stops the supply of oxygen Laddomat 21 Picture 10 The fire goes out when the fan or damper stops the supply of oxygen

…and stops the circulation pump… Laddomat 21 Picture 11 The flue cools down… …and stops the circulation pump… …the flow ceases…

Laddomat 21 Picture 12 Residual heat from the voiler is transferred to the top of the tank… The radiator return valve adds cold return water… The check-valve opens

Laddomat 21 Picture 13 After a number of hours, there is no more heat in the tank… …and the electrical cartridge starts up again The radiator return valve adds cold return water

Laddomat 21 This is how the Laddomat 21 works in the event of a power cut Picture 14 The boiler is burning at maximum output

Laddomat 21 This is how the Laddomat 21 works in the event of a power cut Picture 15 The tank is being charged…

Laddomat 21 This is how the Laddomat 21 works in the event of a power cut Picture 16 The unthinkable happens… A power cut !!!!!!!!!

Laddomat 21 This is how the Laddomat 21 works in the event of a power cut Picture 17 The pump stops… The check-valve for selfcirculation opens The fan stops, the air supply is cut off

Laddomat 21 This is how the Laddomat 21 works in the event of a power cut Picture 18 The heat from the boiler is transferred to the tank. The fire can be kept going at limited output until electrical power is restored. The pressure of the natural circulation system fills the boiler with cold water.