Answer:We do not have a DIBT number for any of our boilers, as such numbers are not necessary and do not carry any advantages. All our devices are CE certified and comply with the requirements of the Gas Appliances Directive (90/396/EEC) and the Boiler Efficiency Directive (92/42/EEC).

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Answer: Our neutralisation containers and condensate lift pumps are only suitable for use with condensing gas devices. Reason: the material of the containers is resistant up to a pH value of 2.8. However, the condensate in oil condensing devices can reach a pH value of up to 1.8. Further information: Mommertz offers special neutralisation containers for oil condensing boilers which are fitted with activated carbon filters. Please call +49(0)8221/8238 for further details.

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Answer: 1.) The flue gas system is generally sufficient for the new boiler if the old flue gas system was made by Paradigma. The only thing to be noted is that a transition piece (02-8330) is required for DN 70 or DN 70/125 plastic systems. 2.) The flue gas system generally does not have to be replaced. It is sufficient to install an additional air / flue gas inspection pipe. The dimensions of the existing flue gas pipe are also important.

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Answer: Flue gas pipes (also air / flue gas systems), which bridge storeys or rooms, except in the installation room of the furnace, must always be installed in a separate shaft or lagged. The shafts must have a fire resistance period of 90 minutes or 30 minutes in low buildings. "Low buildings" are defined in the corresponding state building regulations.

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Answer: This is technically possible, but the type plate must also be replaced accordingly, and this is prohibited under ISO9001. Therefore, conversion can only be performed by replacing the boiler.

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Answer: There is generally no way to lock the boiler should a condensate pump fail. However, in the new condensate pump which we have offered since April 2001 (manufactured by Mommertz, order no. 02-8051), there are two cables at the pump head. These two cables form a floating contact to which an error message (e.g. lamp or horn) can be connected to indicate that the condensate pump is defective.

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Answer: Downwinds are the most likely cause for the problems. Tip: cut a flue gas bend (87°) directly after the bend and attach it to the outlet pipe so that the open side of the cut-off bend faces away from the direction of the prevailing winds.

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Answer: The following items must be checked: all components connected to the 24 volt electrical circuit should be checked for short circuits or damage. If there are point-to-point radio aerials or transmission masts installed in the vicinity, grid filters should be installed retrospectively in the grid supply line, in the sensor and external sensor lines. If telephone cables were used for the sensor cables, you must ensure that they are earthed. Telephone cables are generally wrapped in a thin aluminium-coloured film which acts as shielding. If this film is not earthed (remove a piece, wind it around itself and connect it to the earthing terminal), the film loses its shielding effect and can even act as an amplifier for electromagnetic interference.

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Answer: Gunmetal pumps (or bronze pumps) generally have nothing to do with oxygen diffusion. Gunmetal pumps only have to be used for drinking water systems. Of course, you can also use gunmetal pumps in the Modula II, if suppliers offer these pumps with an installed length of 130 mm. If not, the pump must be positioned outside the boiler.

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Answer: Gas pipe system testing consists of a leak test and includes the pipes and their fittings, but excludes the gas devices and the corresponding control and safety equipment.

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Answer: We strongly advise against using chemical agents (see the installation/commissioning instructions).

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Answer: The noise emission level of a single Modula II 41 kW or 61 kW is 48 dBA (distance to boiler: 1 m) Values for cascade systems are not known.

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Answer: The system may be operated in bedrooms, however it is unadvisable, as there is always a certain noise level. Use in residential rooms, e.g. an office, kitchen or hall is no problem. The device is so quite that the sound it emits is generally not a disturbance in these rooms.

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Answer: The water-carrying pipes are made of zinc-plated iron piping.

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Answer: First, check what kind of ignition electrode is installed. If the ignition electrode is labelled "KR", it is possible that this electrode does not last for more than six months. However, we have not had these ignition electrodes in our range for over a year.
The ignition electrodes currently used are labelled "MX" and they last for at least one year or longer. If one of these "MX" initiation electrodes fails after a short time, this is probably due to halogens in the combustion air or a high concentration of odorisers (aromatic substances) in the gas. Halogens are primarily to be found in solvents, washing and cleaning agents. These problems generally arise when the boiler is dependent on ambient air and such substances are stored in the installation room.

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Antwort:When removing the spring clip from a Modula 1 which is run on liquid gas, the same speed changes must be made as for natural gas boilers (see sticker). However, the CO2 value should be set to 10.7 % ± 0.5 %.

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Antwort: In the Modula I and Modula II, the pressures measured are generally the same. When the gas combination block is closed, you can measure the pending idle pressure (generally approximately 20 mbar) at the lower pressure measurement nipple (P in). When the gas combination block is open, you can measure the flow pressure (generally between 17 mbar and 19 mbar). At the upper pressure measurement nipple (P out) you can measure an underpressure at which the blower sucks in the gas when the gas combination block is open. This is generally between -1 mbar and -3 mbar depending on the fan speed. There are no pressure tables for this, as the combined gas-air regulation operates without problems at the prescribed idle pressure of 20 mbar or 50 mbar for liquid gas. Thus, the reference variable is generally the pending idle pressure.

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Answer: Of course, the Modula II can be connected to an aluminium flue gas system. The boiler and the aluminium flue gas system were each separately tested and approved and can be operated together. The old boiler was also a condensing gas unit. Further information: the Modula II devices are labelled on the type plate in accordance with the Gas Appliances Directive 90/396/EEC for the approved gas appliance types. Thus, the Modula II devices are also labelled C63x. That means that the gas furnace is approved for connection to a combustion air supply and flue gas piping which is not tested and certified with the gas furnace. Chimney sweeps generally know this labelling and its meaning.

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Answer: Maximum 100 mbar, also stated on the type plate of all gas combination blocks.

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Answer: The heat exchanger capacity in the Modula 11 41 kW is only 5.5 litres. The heat quantity lost by the heat exchanger with so little water when idle is therefore insignificant. To clarify this – the average loss when the Modula 11 41 kW is ready for operation at a heat exchanger temperature of 70°C is approximately 190 watts. This decreases rapidly at lower heat exchanger temperatures.

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Answer: After a boiler type is discontinued, or is replaced by a subsequent model, we are obliged to guarantee a supply of replacement parts for at least 10 years. However, we will strive to ensure that replacement parts are available for more than 10 years.

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Answer: If the fluorescent tube has a CE mark (which is generally the case), no problems are to be expected, as these tubes are interference suppressed. In order to be sure, connect the fluorescent tube to a second current circuit (second phase). This rules out any possible effects.

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Answer: If the condensate in the container exceeds the switching height of the pump, the float switch closes the floating contact. This allows a lamp or an audible signal to be triggered to indicate that the pump is defective.

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Answer: Theoretically, 8 amperes can be applied to the relay. However, the control box is fused with a 2 ampere fuse, which means that 2 amperes is the upper limit.

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Answer: The rated heat load of the boiler or the correct regulating function of the gas combination block is designed for the specified idle pressure of 20 mbar. If the gas pressure is higher, more gas passes through the gas combination block. This affects the flue gas values and the heat load of the boiler. Therefore, you should always ensure that the idle pressure does not exceed 20 mbar.

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Answer: Torn out or seriously damaged threaded holes in the heat exchanger cannot be repaired. In such cases, the heat exchanger must be replaced entirely.

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Answer: The power supply (mains connection socket) must be protected with a 2 AT fuse. The fuse shown in the drawing is incorrect.

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Answer: Principally: the control box of the ModuVario performs a bleeding programme every time it is switched on, or after power failures. This bleeding programme is also performed after a type E1, E7 and E13 locks are reset.

Bleeding programme sequence:
During the bleeding programme, the boiler pump in ModuVario units with SystaCompact controllers first switches the boiler pump on and off at regular intervals to remove air from the heat exchanger via the automatic air bleed valves. The boiler pump runs constantly in the ModuVario with SystaComfort controllers. The heating circuit pump(s) is/are switched on for 3 minutes and the mixers run.
After approximately 90 seconds, the burner is activated for approximately 5 seconds in both the SystaCompact and the SystaComfort. After the burner is switched off and after a wait period of approximately 5 seconds, the automatic firing device measures the (T between the supply and return. If the (T is now less than or equal to 5 Kelvin, the boiler switches to normal operation (operating mode 0, 3 or 4). If the (T is greater than 5 Kelvin, the automatic firing device starts the burner again for approx. 5 seconds. If the (T is greater than 5 Kelvin again after the burner is switched off and after the wait period, the automatic firing device assumes that the system has not been bled properly or that water is not circulating. The boiler then displays fault E10.

Bypass valve function:
The bypass valve merely prevents excessive temperatures of the boiler during normal heating operation if the thermostat valves close. However, the bypass valve cannot supply the minimum circulation quantity during the bleeding programme.

Conclusion and troubleshooting:
During the bleeding programme, heating water must be able to flow through one or more radiators. This is accomplished by opening any closed thermostat valves or removing one or more thermostat heads. Further information:

We are currently investigating whether the minimum water circulation quantity can be reduced during the bleeding programme so that the volume flow via the bypass valve is sufficient.

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