Views
6 months ago

Nuos Plus Wi-Fi - Manual UK

  • Text
  • Storage
  • Cylinder
  • Sustainability
  • Renewables
  • Air source
  • Heat pump
  • Hot water
  • Water heater
  • Nuos plus
  • Manual
  • Nuos
  • Electrical
  • Heater
  • Installation
  • Heating
  • Appliance

DIAGRAM 1 Typical

DIAGRAM 1 Typical discharge pipe arrangement Safety device (e.g. temperature relief valve) Metal discharge pipe (D1) from temperature relief valve tundish 600mm maximum Tundish 300mm minimum Discharge pipe (D2) from continuos fall. see the following table Discharge below fixed grating provides alternative discharge points see next paragraphs Fixed grating Trapped gully TABLE SIZING OF COPPER DISCHARGE PIPE ‘D2’ FOR COMMON TEMPERATURE RELIEF VALVE OUTLET SIZES Valve outlet size Minimum size of discharge pipe D1* Minimum size of discharge pipe D2* from tundish Maximum resistance allowed, expressed as a length of straight pipe (i.e. no elbows or bends) Resistance created by each elbow or bend G ½” 15 mm 22 mm Up to 9 m 0.3 m 28 mm Up to 10 m 1.0 m 35 mm Up to 27 m 1.4 m G ¾” 22 mm 28 mm Up to 9 m 1.0 m 35 mm Up to 13 m 1.4 m 42 mm Up to 27 m 1.7 m G 1 28 mm 35 mm Up to 9 m 1.4 m 42 mm Up to 13 m i.7 m 54 mm Up to 27 m 2.3 m *see point 2 and 9 and Diagram 1 Note: The above table is based Dn copper pipe. Plastic pipes nay be cf different bore and res stance. Sizes and maximum lengths of plastic should be calculated using cata prepared for the type of pipe ceing used. Worked example: The example below is fora G ½” temperature relief valve with a discharge pipe (D2) having 4 No. 22 mm elbows and length of 7 m from the tundish to the point of discharge. From Table: Maximum resistance allowed for a straight length of 22 mm copper discharge pipe (D2) from a G ½” temperature relief valve is: 9.0 m Subtract the resistance for 4 No. 22 mm elbows at 0.8 m each = 3.2 m Therefore the maximum permitted length equates to 5.8 m which, is less than the actual length of 7 m therefore calculate the next largest size. Maximum resistance allowed for a straight length of 28 mm copper discharge pipe (D2) from a G ½” temperature relief valve is: 18 m Subtract the resistance for 4 No. 28 mm elbows at 1.0 m each = 4m Therefore the maximum permitted length equates to: 14 m As the actual length is 7 m, a 28 mm (D2) copper pipe will be satisfactory. 14 /EN

10. Where a single common discharge pipe serves more than one system, it should beat least one pipe size larger than the largest individual discharge pipe (D2) to be connected. 11. The discharge pipe should not be connected to a soil discharge stack unless it can be demonstrated that the soil discharge stack is capable of safely withstanding temperatures of the water discharged, in which case, it should: a. contain a mechanical seal, not incorporating a water trap, which allows water into the branch pipe without allowing foul air from the drain to be ventilated through the tundish; b. be a separate branch pipe with no sanitary appliances connected to it; c. if plastic pipes are used as branch pipes carrying discharge from a safety device, they should be either polybutylene (PB) or crosslinked polyethylene (PE-X) complying with national standards such as Class S of BS7291-2:2006 or Class S of BS 7291-3:2006 respectively; and d. be continuously marked with a warning that no sanitary appliances should be connected to the pipe. Notes: - Plastic pipes should be joined and assembled with fittings appropriate to the circumstance in which they are used as set out in BS EN ISO 1043-1:2002 Plastics. Symbols and abbreviated terms. Basic polymers and their special characteristics. - Where pipes cannot be connected to the stack it may be possible to route a dedicated pipe alongside or in close proximity to the discharge stack Termination of discharge pipe 12. The discharge pipe (D2) from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge. 13. Examples of acceptable discharge arrangements are: a. to a trapped gully with the end of the pipe below a fixed grating and above the water seal; b. downward discharges at low level; i.e. up to 100mm above external surfaces such as carparks, hard standings, grassed areas etc. are acceptable providing that a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility; and, c. discharges at high level: e.g. into a metal hopper and metal downpipe with the end of the discharge pipe clearly visible or onto a roof capable of withstanding high temperature discharges of water and 3m from any plastic guttering system that would collect such discharges. 14. The discharge would consist of high temperature water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges. In some buildings, e.g. care homes, in-line blending valves would need to meet the additional performance standards set out in NHS Estates Model specification D 08. TYPICAL EXPANSION DISCHARGE ARRANGEMENT Not to scale 15 / EN