Nuaire Group MRXBOX95B-LP1E Installation And Maintenance Manual

Nuaire Group MRXBOX95B-LP1E Installation And Maintenance Manual Manual pdf 2 page image

2.1 Condensate Drain installation1. Unit comes complete with external drain pipe (21.5mm wastepipe). Use conventional plumbing connections to link up withU-trap or alternative drain method (Solvent cementconnections or compression fit connections arerecommended). The condensate must be discharged under awater level in a U-trap drainpipe or an alternative drainmethod which acts as an airlock.2. This condensate discharge connection is suitable for 21.5mmdia. overflow pipe. Solvent cement should be used to makethe joint.3. If using a U-trap please ensure the U-trap has been filled toa suitable level of water to avoid any air locks.4. If the condensation pipe is fitted in an unheated space thepipe should be in insulated to prevent freezing.Nuaire recommend MVHR-DRAIN be used as the primarycondensate take-off. (see figures 4a and 4b).FixingOffer up the MVHR-DRAIN inlet to the threaded tail of theappliance waste outlet or MVHR-DRAIN knuckle or runningadaptor, and tighten the threaded cap sufficiently hand-tight toprovide a water-tight seal (check that the cap screws on squareand does not ‘cross-thread’). When the screwed cap is tight, theMVHR-DRAIN body is secure.1. Cut the pipe to length, allowing for the full compressionsocket depth (using an appropriate pipe cutter, such as aHepworth rachet pipe cutter).2. Remove any ‘swarf’ from the end of the plastic pipe.Ream the copper pipe end to remove any ‘burr’, and file ifnecessary to remove any external sharp edges. Mark thesocket depth on the pipe, and check that the pipe section tobe jointed is free of any surface damage which may affectthe joint seal.3. Unscrew the cap from the MVHR-DRAIN outlet, and slide thecap and rubber seal onto the pipe.4. Insert the pipe end fully into the socket.5. Slide the rubber seal and screwed cap up against the face ofthe socket, and tighten the cap sufficiently hand-tight (checkthat the cap is square to the body and does not ‘cross-thread’). Hand tight should be adequate to form a proper seal.2.2 Extract/input areasThe unit is designed to extract air from all wet roomse.g. bathroom, kitchen, en-suite, utility room (with sink).WC’s do not need to be ventilated if openable windows are fitted.Supply air should be to all habitable rooms e.g. bedrooms andlounge. Extract / input grilles should be adjustable valve types(not supplied).External grilles to have a minimum free area of 12,250 sq mm.2.3 DuctingBefore commencing ducting installation reference should bemade to building regulations document “Domestic ventilationcompliance guide”. This document supports ADF2010 anddetails installation, testing and commissioning of all ventilationsystems.It is recommended that rigid ducting must be used it all times.Flexible ducting has a very high resistance and it is impossibleto calculate how much resistance will be on a system if used.If used the flexible ducting must be kept to a minimum andshould always be pulled taut. A maximum of 300mm shouldbe used on each leg.To prevent condensation on the outside of the outside air inletduct and the air outlet duct from the MRXBOX95B-LP1E, theseducts should be insulated.Ducting must be installed in such a way that resistance toairflow is minimised. Bends should be kept to a minimum.A minimum distance of 200mm between the appliance andany bends in ductwork is recommended.204 x 60mm rectangular ducting should be used. (Refer todwelling ducting design drawing, figure 6 on page 4 for furtherinformation).Ducting joints must be sealed with silicone type sealant andneeds to be taped. Ducting shall be adequately and reliablyfixed to the appliance.2.4 Ventilation flow ratesTable 1.ADF2006 / 2010 – Extract ventilation ratesRoom Min high rate Min low rateKitchen 13 l/sUtility room 8 l/sBathroom 8 l/sSanitaryaccommodation 6 l/sTable 2.Whole dwelling ventilation ratesNumber of bedrooms in dwelling1 2 3 4 5Whole 13 17 21 25 29dwellingventilationrate l/s1, 2Notes:1, In addition, the minimum ventilation rate should be not less than 0.3 l/sper m2 of internal floor area.(This includes all floors, e.g. for a two-story building add the ground andfirst floor areas).2, This is based on two occupants in the main bedroom and a single occu-pant in all other bedrooms. This should be used as the default value. If agreater level of occupancy is expected add 4 l/s per occupant.2 24. 06. 13. Leaflet Number 671608Installation and Maintenance MRXBOX95B-LP1E Mechanical Ventilation with Heat Recovery & Summer BypassFigure 4a. MVHR-DRAIN condensate drain, running to SVP.Total extract rate shouldbe at least the wholedwelling ventilation rategiven in table 2.Figure 4b. MVHR-DRAIN correct installation.RIGHT WRONGFlowSide elevationWhen installed horizontally the ribs must be at the bottom toensure correct operation.