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1. Boiler output There is a difference between the nominal output and the maximum output of a boiler The maximum output can be as much as 30 50 higher than the boilers nominal output 16 Example If the boilers nominal output is 40 kW the max output can reach up to 60 kW This is very important to include in the calculation when dimensioning the system Connection Laddomat 21 must always be connected in the upright posi tion as shown in the diagrams Place Laddomat 21 near the boiler and at the level of the boilers bottom output Pipe runs must be as short as possible and have the minimum number of bends Make sure that all air pockets are eliminated The diameter of the pipe from the top of the boiler to the T pipe and down to the Laddomat 21 must be as large as possible This gives low water velocity and allows air rele ased in the boiler to separate out in the expansion chamber or the vent Starting and stopping the charging pump The speed control on the circula tion pump must be in position 3 NOTE Check that the control is not at the lowest speed or a neutral position because this can prevent the pump from starting Flue thermostat If fitted water thermostat to be connected in parallel The pump can be started by a flue thermostat If extra safety is re quired a water thermostat can be connected in parallel See image to the right Expansion vessel The expansion vessel must be suf
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4. Description Laddomat 21 is designed to allow the boiler to reach a high working temperature soon after firing to preheat the cold tank water in the bottom of the boiler so that the boiler does not rust away due to conden sation charge the tank with water at a high and even tempera ture and low flow to ensure optimal layering in the tank transfer the residual heat in the boiler to the tank after the fire has gone out in the event of electrical power failure stopping the pump transfer the heat in the boiler to the tank through self circulation Start up H L Li eH Fm IE 41 A 3 Final phase Gonnection to top of boiler Ball valve with lever y Q yi m D Q D 3 p lt o lt D 220 260 21 60 21 100 a with m m Ball valve with Y lever Connection Connection to bottom to bottom f boil 255 290 OF DOIIET Automatic valve 21 60 21 100 of tank Dirt trap easy to clean for self circulation in event prevents breakdowns of power failure of functions Operation Laddomat 21 functions fully automatically provided that pump s
5. LADDOMAT 21 Recommended installation with longer distance To make sure the charging will work the Laddomat should be placed near the accumulator NOTE long distance means lower flow which means lower capacity for the system Bottom connection of the expansion Vessel gives reduced heat losses NOTE See Information on page 16 about the expansion vessel Alternative installation with open Connecting a pressurised expansion vessel U Expansion vessel lt Vent When connecting the expansion vessel always connect a pressure gauge Safety valve Cold water fills the expansion vessel during firing less heat loss 3 EF 3 li _ Shut off draining for Laddomat 21 simplified checks of pre pressure 18 Thermostat cartridge The thermostat cartridge is available as a spare part and may need to be replaced more often if it is regularly exposed to temperatures close to or above boiling point The number is engraved on the cartridge See spare parts list for options Service Before carrying out any servicing work close the three shut offs by turning the lever on the valves at right angles to the direction of the pipe This makes it easy to access the pump thermal valve and check valve for service If operating interruptions still occur even though the system has been bled there may be dirt such as lint tape or thread swarf st
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7. ection to the tank to prioritise heating The connection is directed down wards to prevent air rising to the radiators Laddomat 21 can easily be reversed for right hand mounting Just move the thermometers to the other m lt gt side K III Connecting 2 tanks The tanks must be located up against each other and as close as possible to the boiler The pipe runs from the bot tom of the tanks are always laid close to the floor t is important that the flow to the tanks during charging and discharging is distributed equally If the system is connected incorrectly then charging will be cut off when tank 1 is full of hot water which will reach the boiler be fore the other tanks are completely filled Tank 2 will be virtually unused If the system is connected incorrectly the warm water and the heat will run out earlier than estimated after the bur ner has stopped since tank 1 will cool down more quickly than the other If these requirements cannot be met there are other connection options Equal pipe lengths To achieve equal resistance it is essential to use approximately the same pipe lengths to the tanks this is achieved by 1 Connecting the charging circuit diagonally A A 2 Connecting the radiator circuit diagonally B B In addition the dimension of the pipes between the tanks must be large enough to facilitate self circulation between the tank
8. er would then be 2 2 m 6 bends 1 bend is equivalent to 1 m pipe length Boiler with max output up to Laddomat 21 60 45 kW min 28 Cu pipe or R25 60 kW min 35 Cu pipe or R32 Laddomat 21 100 80 kW min 35 Cu r r alt R32 100 kW min 42 Cu r r alt R40 120 kW min 54 Cu ror alt R50 Flow At the above pipe dimensions Laddomat 21 60 gives 2 3 m3 h Laddomat 21 100 gives 3 4m3 h See flow diagram below The dimensions must be increased for longer distances The maximum distance between boiler and tank is 6 m Total length would then be 6 6 m 6 bends Maximum distance and self circulation With longer distance the Laddomat should be placed closer to the accumulator Remember that flow capacity will decrease both when it comes to pump flow as well as self circulation See example on page 6 If there are special requirements for self circulation the pipes must be dimensioned accordingly The charge temperature at the pipe Pressure drop diagram connection according to table 1 for 40 60 kW boilers kPa Mwp p 43 ump spee a 50 5 Thermo stat 40 4 78 C _ 80 30 3 72 C 70 20 2 oh 2 10 1 60 Output 50 Max Flowm3 h 1 2 3 Pressure drop diagram The charge temperature at the pipe connection according to table 1 for 80 120 kW boil kPa Mwp 2 Pump speed 3 C 50 5 90 Thermo 40 4 stat 7800 20 30 3 oo 0 20 2 10 1 oc 60 Output 50 Max Flowm3 h 1 2 3 4
9. ficiently large at least 5 10 of the total volume for an open system If a pressure vessel is installed this must be at least 10 20 of the total volume Each installation must be specially dimensioned in accordance with the manufacturer s instructions Check that the operating pressure when the system is cold is never lower than the height difference between the pressure gauge and the highest radiator 2 metre water pil lar mwp 1 m 0 1 bar Radiator system To make the maximum use of the storage tank it is very important that the radiator system is fitted with 1 Automatic by pass control like Thermomatic with flow sensor and room sensor is ideal for this purpose thanks to its ability to sense the heating needs of the house rapidly The automatic by pass control always matches heat output exactly to requirements 2 Thermostatic valves with integrated pressure reduction devices which are set to suit the radiator size Both measures are intended to reduce the flow and so reduce the return temperature without raising the delivery temperature The lower the return temperature the longer the heat in the tank lasts Connecting to 1 tank 1 The pipe runs shown on the diagram are optimised to minimise air related operating interruptions 2 The hot water pipe to the by pass valve can be connected in two ways A Approx 30 cm from the top of the tank to prioritise domestic hot water B On the charge line conn
10. s It is an advantage if the tanks are connected together in the centre to further distribute the heat Connecting the by pass valve The hot water port is connected at B which prioritises hot water or at B which prioritises heating Electrical immersion heater operation When operating solely on the electrical immersion heater it is an advantage only to heat the first tank to prevent heat loss Shut off the other tank using the valve at the bottom of the tank NOTE If the radiator Is connected in this way there IS a large risk of heat retention in the boiler and or reduced heat to the radiator circuit Laddomat 21 4 The pipe to the bottom of the tank must not be routed through the roof This connection removes the self circulation function 17 Connection suggestions Installation with open expansion vessel Level NDTE This type of Installation will remove the self circulation function The check valve must be blocked to lower the risk of keeping the boiler warm See picture 5 on next page for instruction Safety line min D25 Radiator Expansion pipe DN 22 mm Cold water fills the expansion vessel during firing less heat loss 7 Boiler
11. tart and stop is automated See page 16 The settings described in this User manual are normally made only once The Laddomat requires no special supervision or service NOTE Diagrams in this brochure only describe connection principles Each installation must be measured and carried out according to the applicable regulations Operating phase Nag Tim a LT Self circulation Technical data Laddomat 21 60 Pump Laddomat LM6 Laddomat LM6A ErP 2015 Connection 3 x Cu28 with lever Opening temperature Max boiler output 3 x R32 with lever Do D77 6937 BB 72 787 B oF 87 C 60 kW Technical data Laddomat 21 100 Pump Wilo RS25 7 Wilo Yonos Para ErP 2015 Connection 3 x R82 with lever Opening temperature 53 0 63 66 72 78 83 or 87 G Max boiler output 120 kW 15 Dimensioning Generous pipe dimensions and short lengths guarantee operating reliability even when the demand for heat is hieh This also allows effective self circulation in the event of power failure Recommended pipe dimensions for a maximum boiler to tank distance of 2 m Total length boiler tank boil
12. uck in the coupling Disassemble and clean Clean all sealing surfaces when reassembling 1 The thermal valve 2 The self circulation valve 3 The pump impeller In some installations there are problems with extremely high levels of contaminants These can form deposits inside the pump which may result in stoppages Instructions for replacing the thermostat in Laddomat 21 Check that the pump is switched off Close the three shut off valves Unscrew the cover opposite the pump Remove the cover with the spring plunger and thermostat from Laddomat 21 The thermostat is held in place on the plunger by an O ring Detach the thermostat from the plunger carefully using a screwdriver see image on right Push the new thermostat into the plunger Reinstall the cover with the spring plunger and thermostat Open the shut off valves Wait a few minutes before starting the pump to allow any air to rise and escape from the system The installation is now ready for use Blocking the check valve If you for some reason want to completely shut off the self circulation function the check valve must be blocked Use the blocking clip placed at the bottom of the EPP insulation Picture 3 to block the check valve The clip is then fastened around the check valve axis ac cording to picture 5 To reach the axis the spring needs to be removed Picture 1 Cover O ring Choke valve spring Choke valve pin washer

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