Nu-Heat UNDERFLOOR & RENEWABLES

Transcription

1 UNDERFLOOR HEATING Nu-Heat UNDERFLOOR & RENEWABLES 14mm Fastflo in diffuser panels, installed between joists Supplied by Nu-Heat 400mm centres Supplied by others Decking 14mm Fastflo tubing Heat transfer plates Nu-Heat TriPanel 25mm EHD polystyrene 9mm plywood support decking Floor insulation 50 x 25mm timber battens Joists at 400mm centres TECHNICAL INFORMATION Insulation Part E of the Building Regulations requires a minimum of 100mm mineral wool insulation to be placed in the joist void in separating floors for acoustic reasons. For ground floors or floors over unheated areas, at least 150mm of mineral wool should be fitted below the panels. Check with the architect whether Part L of the Building Regulations requires thicker insulation to be used. Floor structure Laminate floors thicker than 20mm may be laid on up to 3mm thick non-felt underlay directly onto the underfloor heating. Areas to be tiled can be covered by a plywood deck instead of chipboard. A quality two-part adhesive may then be used for fixing the tiles. For other areas 18 22mm chipboard deck may be used. The overall thickness of the deck should not exceed 30mm unless this has been agreed with a Nu-Heat Design Engineer. Nu-Heat 06.16

2 PREPARING JOISTS FOR THE POLYSTYRENE TRIPANEL Check system design for exact location of notches Notches 1 Notch joists to allow 14mm heating tubes to pass between bays the system design will indicate locations. Where pipe is to be installed at notches will be required at both ends of the joists. All notching must be in accordance with current Building Regulations. See also Nu-Heat notching information. 25mm 2 Push mineral wool insulation into the gap between the joists. See section above for details. 3 Fit a batten along the side of each joist to support a 9mm plywood platform. The batten must be installed so that the diffuser plates and polystyrene TriPanel will be level with the top of the joists to ensure good contact with the flooring. 4 Fit the 9mm plywood to the battens leaving a gap of 25mm for the polystyrene TriPanel.

3 INSTALLING THE POLYSTYRENE TRIPANEL 116mm centres 175mm centres Cut along this line when panel is to be laid between bearers with Cut along this line when panel is to be laid between bearers with Start laying panel from battens 5 The tri-panel should be installed along each joist bay starting at the end of the notch. 6 The tri-panel should be cut along the correct line for the chosen pipe centres. The pipe centres for each room will be stated on the system design. INSTALLING THE METAL HEAT DIFFUSER PLATES Snap points 150mm 900mm Stop line 7 Install the heat transfer plates firmly into the tracked polystyrene leaving a small gap between plates and stopping the plates in the position shown in the illustrations. The plates have snap lines to allow the plate to be snapped to length. Ensure the plates are installed at the correct centres for the pipework, this will be shown on the system drawing. Notes: To avoid injury always wear gloves when handling heat diffuser plates. Take care when snapping the plates not to leave a burr as this could cause damage to the heating tube when installed.

4 SEQUENCE OF LAYING THE HEATING TUBE IN THE FLOOR Notches will be required at both ends when are to be installed 8 Firstly install the furthest room from the manifold. Ensure that the correct coil is selected for the room to be installed. The coil is marked every metre with its overall length and remaining coil length. The coil lengths for the rooms will be shown on the system drawings. 9 Connect one end of the coil into the correct port of the manifold as described in the Installation Manual. Note: Always mark the flow and return pipes with their correct zone names. Do not get pipes crossed. Use single nail clips where necessary. 10 Lay the coil as shown on the system drawing clipping the pipe and inserting any additional plates where necessary. Using a tube un-coiler will reduce the need for additional clips. Note: Do not kink the tube. 11 Continue installing the tube until there is just enough tube remaining to return to the manifold plus any difference in supplied length and cut-length as stated on the system drawings. The metre markings on the coil can be used to help judge the amount of pipe remaining. Note: All tube coils within a single zone must be no more than 10% different in length. 12 Once back at the manifold do not cut the tube to length or connect it into the manifold at this stage unless the zone has only one coil. Label the return pipe to ensure the pipes do not get crossed when connected at a later stage. 13 All remaining coils for the zone can now be installed until the room is fully covered with tube. Two runs per bay DINING ROOM ZONE 3 Nu-Heat Label zones Three runs per bay

5 INSTALLING THE 14MM FASTFLO TUBE Pipe layout with 116mm spacings Pipe layout with 175mm spacings Balancing coil lengths 116mm spacings Balancing coil lengths 175mm spacings Notes: When heat transfer plates are used between joists always P follow building regulations on notching. CONNECTING THE PIPE AND PRESSURE TESTING 14 When the correct number and lengths of tube are laid in the floor, trim excess coil length and connect to the manifold as described in the Installation Manual. All ports on the manifold should now be connected. Note: Always mark the flow and return pipes with their correct zone names. Do not get pipes crossed. DINING ROOM ZONE 3 t ea 15 The manifold must now be filled and pressure tested as described in the Installation Manual before the 18 or 22mm moisture resistant chipboard is fitted. H u- N Label zones INSTALLING THE CHIPBOARD FLOOR DECK Stagger chipboard panels Leave a 10mm expansion gap between the deck and wall Glue joints as advised by the chipboard manufacturer. 16 The chipboard flooring should be installed with the joints staggered and glued. If fixing the chipboard using screws, take care not to damage the pipe. Leave a 10mm expansion gap between the flooring and the wall.