97 01202 662500 | sales@hamworthy-heating.com | hamworthy-heating.com Sizing and conversions Here you will find some useful sizing and conversion charts to make sure you comply with British standards and regulations. For a full copy of this information as well as our comprehensive site survey pad, book onto our CPD ‘Best Practice Plant Room Refurbishment’. PM5 - System flow temperature/anti-flash pressure Depending on the system flow temperature, this chart shows you how high the header tank should be above the system to meet PM5. PM5 is no longer around but we still advise adhering to it for best practice when designing a non-pressurised system. This table gives you the correct size of pipes for the kW output boiler according to BS6644. Pipes can be bigger but must not be smaller. Use this chart to select the correct size of air and dirt separator to match your system. For more information on the Clenston range refer to page 80. System flow temp (°C) System head pressure (bar) System head (m) 80.0 0.20 2.0 85.0 0.20 2.0 90.0 0.31 3.2 95.0 0.52 5.3 100.0 0.79 8.1 105.0 1.11 11.3 110.0 1.46 14.9 115.0 1.86 19.0 Open vent pipe and cold water feed pipe sizes BS6644 Boiler output Open vent size Cold feed size <60kW 25mm (1 in) 19mm (¾ in) 60kW-150kW 32mm (1¼ in) 25mm (1 in) 151kW-300kW 38mm (1½ in) 32mm (1¼ in) 301kW-600kW 50mm (2 in) 38mm (1½ in) 601kW- 800kW 65mm (2½ in) 50mm (2 in) 801kW-1200kW 80mm (3 in) 50mm (2 in) Clenston air and dirt separator Unit ref. Max. flow rate for unit (l/s) Max. boiler output at 10°C Delta T Max. boiler output at 20°C Delta T CL-50 2.9 121 kW 242 kW CL-65 4.9 205 kW 410 kW CL-80 7.5 314 kW 628 kW CL-100 11.7 489 kW 978 kW CL-125 18.3 765 kW 1530 kW CL-150 26.5 1108 kW 2216 kW CL-200 47.0 1965 kW 3930 kW Burstock expansion vessels (Heating systems at 80°C operating temp.) Burstock model no. Vessel(s) capacity (litres) *Max. system volume supported for given vessel capacity (litres) **Est. max. installed boiler power for given vessel capacity (kW) Water only @10% Antifreeze Water only @10% Antifreeze PV25W** 25 302 266 30 26 PV60W 60 724 638 72 63 PV80W 80 966 851 96 85 PV100W 100 1207 1064 120 106 PV200W 200 2414 2127 241 212 PV300W 300 3621 3191 362 319 PV400W 400 4828 4255 482 425 PV500W 500 6034 5319 603 531 2 x PV300W 600 7241 6383 724 638 1 x PV300W +1 x PV400W 700 8448 7447 845 744 PV800W 800 9655 8511 965 851 1 x PV500W +1 x PV400W 900 10862 9574 1086 957 PV1000W 1000 12069 10638 1206 1063 * Based on 80°C max. flow temperature, 1.8 bar cold fill pressure, acceptance vol. 0.35, expansion factors: water = 0.029, @10% antifreeze = 0.0329. ** Estimated using 1kW of installed power for every 10 litres of system volume. Use this chart to select the correct size of expansion vessel to match your system. For more information on the Burstock range refer to page 82. Installed boiler output (kW) Maximum system volume (litres) Horton dosing pot model Dosing pot capacity (litres) 0–250 0–2499 HN-3.5 3.5 250–500 2500–4999 HN-5 5 500–1000 5000–9999 HN-10 10 1000 and above 10000 and above HN-15 15 Chemical dosing of heating or chilled water systems must be in accordance with appliance manufacturer’s recommendations. Use this chart to select the correct size of dosing pot to match your system. For more information on the Horton range refer to page 79. Horton chemical dosing pot selection chart Mechanical flow rate per kW total rated net heat input (m3/h) Boiler type Minimum inlet air (combustion & ventilation) Difference between inlet and extract air (inlet minus extract ventilation) With draught diverter 2.8 2.07 ± 0.18 Without draught diverter 2.6 1.35 ± 0.18 This table shows you the ventilation requirements for the boiler house in line with BS6644. Minimum requirements for mechanical ventilation to boiler houses. For full details refer to BS6644 Applies to single boilers only 1. For larger sizes or for systems with defined pipe sizes consult technical department. 2. Units above are selected to a limiting velocity of 1.5 m/sec as per HHL recommendations. SCHEMATICS & SYSTEM DESIGN
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