Navien NCB-24LSWE Installation & Operation Manual

Also see for NCB-24LSWE: Service manual

Navien NCB-24LSWE Installation & Operation Manual Manual pdf 23 page image

24 Installing the System Piping3.2 Installing a Domestic Hot Water(DHW) SystemThe Navien NCB LSWE boiler provides domestic hot watercontinuously when flow is sensed by the flow sensor. Thismethod is the most efficient means of heating water by allowingthe boiler to operate at a lower return water temperatureby minimizing standby losses, thus increasing combustionefficiency.CAUTION● The installation must be made by sufficiently qualifiedstaff, authorised to do so.● For correct installation, all the requirements andrecommendations described in the Regulation for HeatingInstallations in Buildings (RITE) must be complied with,together with all other national and/or local regulationsapplicable at the time of installation.Refer to the following illustration for a typical DHW pipingexample for the boiler.CondensateDrain HoseCold WaterSupplyCondensate PipeHot Water SupplyBottom ViewDHW OutletAdaptorCondensateOutletWater InletAdaptorWhen installing the DHW system, follow these guidelines:● Use only pipes, fittings, valves, and other components (suchas solder), that are approved for use in potable water systems.● Tighten the connection valves with care to avoid damage.● Keep the hot water piping system as short as possible, todeliver hot water to the fixtures more quickly.● After installing the boiler, clean the cold water inlet filter.Then, test the boiler for proper DHW supply and inspect forleaks.3.3 Connecting the Condensate DrainLineThe Navien NCB LSWE boiler creates condensation when itoperates. This condensation has an acidic pH of 3-5. Followall local codes and regulations when disposing of condensatefrom the boiler. We recommend draining the condensate intoa laundry tub, as the alkali in laundry detergent will neutralizethe acid in the condensate. However, other suitable waste drainlocations may be used according to the local legislation.CAUTION● Do not cap or plug the integrated condensate line. Ifprevented from draining, condensate can damage theboiler.● The condensate line must have a negative slope to drainproperly.The requirements recommended for the condensate drain lineinstallation are as follows:● For correct condensate drain line installation, the tube musthave a minimum diameter of Ø22 mm.● The tube must be made of a material that can withstandcorrosion, e.g. PVC, PCV-U, ABS, PVC-C or PP. It must not bemade of metal.● For safety reasons, the end of the tube must be as close aspossible to the draining point.● When the condensate drainage is connected to a generaldrain network inside the building, the effects of overpressurethat could occur inside it must be taken into account,installing suitable pressure release and ventilation elements.● The length of the tubes outside the building must be as shortas possible. They must also be installed with as much tilt aspossible. The tubes must be insulated if they are exposedto extremly cold weather or blizzards. If the tubes are notinsulated, they must have a diameter of at least Ø32 mm.● The drain tube must have a minimum tilt of 2.5° downstreamof the boiler.● For tubes with Ø22 mm, the maximum permitted length is 3metres.● If the appliance is installed in a non-heated premises, the tubesystem must be treated as if it was an outdoor installation.● To prevent the risk of tripping, the outdoor tubes must befixed to the walls.Before connecting the condensate drain, choose one of thefollowing disposal options: