Charging unit Laddomat 21-100 (opening temperature: 72°C) - insulated with electronic pump

Laddomat 21-100 with electronic pump is a charging unit for a gasifying boiler. 

Laddomat 21-100 enables the boiler to attain a proper boiler working temperature in a very short time.

• Charging is continued by means of a slow flow of hot water.

• During the final part of the burn-out the Laddomat 21-100 charges the storage tank fully due to the unique thermal valve, which closes the bypass opening completely.

• When the fire has gone out, Laddomat makes use of the remaining heat in the boiler and ember by the self-circulation of hot water from the top of the boiler into the storage tank. Energy is stored in the tank instead of being lost through the chimney.

• In the event of a power failure Laddomat 21-100 starts charging the container immediately by self-circulation.

The same happens if the pump breaks down. Reverse circulation is prevented during periods of non-firing, which means almost no loss of heat.

You can also buy a thermostat cartridge for Laddomat to change the opening temperature - available in our shop.

 

How does a Laddomat work in the central heating system

Starting the boiler

To achieve a high level of efficiency and low emissions of unburned substances, it is important that the boiler reaches the working temperature quickly. This is achieved by the circulation pump that is starting as soon as combustion (firing) begins. This prevents cold water from the bottom of the accumulator tank (thermal store) cooling the boiler unnecessarily, through self-circulation. The circulation pump can operate in three different ways. Firing has started and the pump has started as well. The thermostat cartidge has not started to open yet. The valve plate of the self-circulating thermostatic valve is kept closed by the water pressure from the circulation pump.

Boiler operating phase

The boiler has reached operating temperature. The thermostat cartridge has opened and mixes the cold water from the accumulator accumulator tank. The mixed water entering the bottom of the boiler has a temperature of about 5–20°C below the opening temperature of the thermostat cartridge. The higher the output of the boiler and the higher the temperature of the water exiting the boiler, the more cold water is mixed in from the bottom of the accumulation tank. This is the same characteristic that allows Laddomat to separate effectively the thermal water layers, while charging the accumulator tank under all different operating conditions in different boilers.

Final phase

During the final phase of charging the by-pass port in Laddomat is completely closed to the top of the boiler. All water is routed to the accumulation tank which becomes fully charged.

Self circulation when the boiler has stopped

If a flue thermostat or similar equipment is installed, it will stop the pump immediately after the fire goes out. The advantage of stopping the pump quickly after the fire goes out is that the cool return water from the radiator circuit flows into the bottom of the boiler through self-circulation. The stored heat in the boiler is then transferred to the top of the accumulator tank, and the house then benefits from it. Stopping the pump when heating ceases, either manually or automatically, is important for one further reason. The hot water in the accumulation tank will otherwise be mixed with cold radiator water down to the closing temperature of the thermostat cartridge. If the tank is heated to 90°C and the thermostat cartridge closes at 75° the whole accumulator tank falls to this temperature if the pump is not switched off.

Self circulation in event of a power cut

If a power cut occurs during firing, self-circulation starts automatically through the easily opened valve check, on the condition that the water in the accumulator tank is colder than the water in the boiler. The self-circulation power is created by the weight difference between lighter hot water and heavier cold water. If the accumulator tank is completely heated all the way to the bottom, self-circulation will be limited, and the boiler could still hit boiling point. This boiling can be stopped by feeding a small quantity of cold water directly into the bottom of the boiler through the system filling tap. In the event of a sustained power cut, the whole house can be heated through self-circulation, if the pipe-runs and dimensions are suitable. The firing should be matched to the output which can be transferred to the storage accumulator tank through self-circulation.

Connection of Laddomats to central heating