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Kaden KU5 Installer Manual
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Contents
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23Good duct design and sizing are essential to every Kaden Central Heating system. Use the Kaden Size Guide andtechnical data within this manual for the best results and follow these guidelines:• Ductwork should be well insulated and airtight and have a minimum insulation rating of R1.0 (R1.5 in someareas). Ensure that ducting complies with the Building Code of Australia.• The ducting should be well fastened to pops, BTO’s, outlet boots and neck adapters adequately with duct tape,in accordance with AS 4254 and HB 276.• It should also be properly sized, and curves and bends should be smooth enough to ensure that the air flowsthrough efficiently, quietly and with minimal resistance.• The registers and diffusers should be large enough and of good design. They should minimise noise, whileproviding the correct distribution pattern.• The positive return air system should be fitted with a grille large enough to accept the full air capacity of thesystem at low noise levels.• If the system uses high level outlets (e.g. ceiling diffusers), then the return air inlet should be at a low level.Ceiling systems with a high level return air may result in reduced performance.• For all Kaden heaters, access to the ductwork must be provided for general maintenance and service to thesupply air thermistor sensor where applicable.NOTEIt is important that the ducting should be well insulated. It is mandatory under building codes toinstall insulated, fire rated duct.If a filter is fitted to the return air grille, it should be easily accessible for regular cleaning. Table 5 gives the minimumrecommended return air grille sizes for each model heater to handle the maximum rated airflow.6.1 MINIMUM RECOMMENDED RETURN AIR GRILLE SELECTION CHARTModel Without Filter With FilterGrille Size (m²) Example of Size (mm) Grille Size (m²) Example of Size (mm)KU521 0.28 400 x 700 0.42 400 x 1050KU530 0.36 400 x 900 0.54 400 x 1350KU415 0.26 400 x 650 0.39 400 x 1000KU420 0.26 400 x 650 0.39 400 x 1000KU425 0.26 400 x 650 0.39 400 x 1000KU430 0.31 400 x 800 0.47 400 x 1200KU315 0.19 400 x 475 0.28 400 x 700KU320 0.22 400 x 550 0.32 400 x 800KU325 0.24 400 x 600 0.35 400 x 875KU330 0.35 400 x 1000 0.51 400 x 1275KE415 0.19 400 x 475 0.28 400 x 700KE420 0.22 400 x 550 0.32 400 x 800KE420XA* 0.24 400 x 600 0.35 400 x 875KE428 0.32 400 x 800 0.46 400 x 1150KE428XA* 0.35 400 x 875 0.54 400 x 1350KE315 0.19 400 x 475 0.51 400 x 700KE320 0.22 400 x 550 0.32 400 x 800KE320XA* 0.24 400 x 600 0.35 400 x 875KE328 0.32 400 x 800 0.46 400 x 1350KE328XA* 0.35 400 x 875 0.51 400 x 1275* XA is based on base box POP sizes.Table 5NOTEGrille sizes are based on maximum airflow with typical Egg-Crate Grille type. For all other types,consult grille manufacturer’s specifications. For example a grille with a free ventilation openingmeasuring 400mm x 750mm, the grille size is 0.4m x 0.75m = 0.3m2. This grille would be suitablefor a KU521 heater provided the grille does not have a filter fitted.6. DUCTING INFORMATION |
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