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1 year ago

Velis Evo - UK Manual

  • Text
  • Heater
  • Water
  • Evo
  • Manual
  • Velis
  • Installation
  • Heater
  • Electrical
  • Heating
  • Appliance

PRESSURE + TEMPERATURE

PRESSURE + TEMPERATURE RELIEF VALVE 15 mm COLD MAINS-IN 15/22 mm EXPANSION VASSEL COMBINATION VASSEL HOT SUPPLY 15/22 mm DRAIN (not supplied) EXPANSION RELIEF PIPE TUNDISH Do not fi t any stop cocks or isolating valves within the distance required for expansion. If a pressure reducing valve is needed, due to a mains pressure of over 3.5 bar, an expansion control kit must be fi tted regardless of expansion pipework installed. The expansion distances quoted are for 15mm pipes and can be approximately halved for 22mm pipes. The appliance must not be supplied with water of hardness less than 12°F, not with especially hard water (greater than 25°F); we recommend installing a water softener, properly calibrated and controlled - do not allow the residual hardness to fall below 15°F. The appliance is covered under the Building Regulations and therefore it is not possible to accommodate the expansion water within the system pipe work and consequently a set of expansion controls must be installed. Note: The discharge from relief valves must be made in a safe and conspicuous manner. Please note that in all cases the dielectric junctions must be connected to the heater before any other connection is made (these prevent an electrolytic reaction). 8 / EN

If the supplied Dielectric Junctions are not fitted this could void the warranty. Only the use of copper pipe is recommended for connection to the heater. If any other material is used it must be able to withstand 90°C at 7 bar pressure for long periods. No valve must be fitted between the expansion/pressure relief valve and the water heater. All other required safety components to install the appliance are supplied as a kit with the appliance: 15 mm pressure reducing valve set at 3.5bar. Expansion vessel (charge pressure set at 3.5bar)” DISCHARGE PIPE WORK NOTE: The following guidelines refer to Building Regulation G3. It is good practice to follow these guidelines for all relief valve discharge pipe work. 1) The tundish must be vertical and fi tted within 600 mm of the temperature & pressure relief valve and must be located with the cylinder. The tundish must also be in a position visible to the occupants, and positioned away from any electrical devices. The discharge pipe from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge and to be of metal. 2) Discharge pipes from the temperature & pressure relief and pressure relief valve may be joined together. 3) The pipe diameter must be at least one pipe size larger than the nominal outlet size of the safety device unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9 m long. i.e. Discharge pipes between 9 m and 18 m equivalent resistance length should be at least 2 sizes larger than the nominal outlet size of the safety device. Between 18 m and 27 m at least 3 times larger, and so on. Bends must be taken into account in calculating the fl ow resistance. See the following fi gure and the Table 2. 4) The discharge pipe must have a vertical section of pipe at least 300 mm in length, below the tundish before any elbows or bends in the pipe work. 5) The discharge pipe must be installed with a continuous fall. 6) The discharge must be visible at both the tundish and the fi nal point of discharge, but where this is not possible or practically diffi cult; there should be clear visibility at one or other of these locations. Examples of acceptance are: i) Ideally below a fi xed grating and above the water seal in a trapped gully. ii) Downward discharges at a low level; i.e. up to 100 mm above external surfaces such as car parks, hard standings, grassed areas etc. These are acceptable providing that where children may play or otherwise come into contact with discharges, a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility. iii) Discharges at high level; i.e. into a metal hopper and metal down pipe with the end of the discharge pipe clearly visible (tundish visible or not). Or onto a roof capable of withstanding high temperature discharges of water 3 m from any plastic guttering systems that would collect such a discharge (tundish visible). 9 / EN