Ariston Andris R 10-15-30 ltr Manual

Fig. 3 (Models

Fig. 3 (Models 30L) PRESSURE RELIEF VALVE (6 bar) TEMPERATURE & PRESSURE RELIEF VALVE (7 Bar / 90°C) TUNDISH KIT A EXPANSION VESSEL (CHARGE AT SET 3.5 bar) NEAREST COLD WATER DRAW-OFF KIT B PRESSURE REDUCING VALVE (SET AT 3.5 bar) DISCHARGE TO DRAIN HOT COLD ISOLATING VALVE (FIXED JUMPER OR 1/4 TURN BALL TYPE) DIELECTRIC JUNCTIONS KIT A NON-RETURN VALVE The tundish must be installed away from electrical devices. SUPPLY TO OTHER PARTS OF PLUMBING SYSTEM COLD WATER MAINS The model 30L is covered under part G3 of the Building Regulations and therefore it is not permissible to accommodate the expansion water within the system pipe work and consequently a set of expansion controls must be installed. Note: The discharge pipework from both relief valves must be made so that an fault is visible to the end user therefore a tundish (Kit C) is required for the 30L unit and is recommended for 10 and 15 litre units 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). 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 valves must be fitted between the expansion and pressure relief valves at any point along any of the safety relief pipework. All other required safety components to install the model 30L are supplied as a kit with the appliance: 15mm pressure reducing valve set at 3.5 bar. Expansion vessel (charge pressure set at 3.5bar). c) DISCHARGE PIPE WORK NOTE: The following refers to Building Regulations G3. It is mandatory to follow these rules for all relief valve discharge pipe work. 1) The tundish should be vertical, located in the same space as the unvented hot water storage system and be fitted as close as possible to, and lower than, the safety device, with no more than 600mm of pipe between the valve outlet and the tundish 2) Discharge pipes from the temperature & pressure relief and pressure relief valve may be joined together. The pressure reducing valve should be installed between the nearest draw off and the non-return valve. 3) The pipe diameter of the D2 pipework must be at least one pipe size larger than the nominal outlet size of the safety device unless it’s 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 flow resistance. See fig. 5 and Table 2. 10 / EN

4) The D2 pipe work from the tundish should have a vertical section of pipe at least 300mm long below the tundish before any elbows or bends in the pipework and should be at least one size larger than the pipe coming in. 5) The discharge pipe must be installed with a continuous fall. 6) The discharge must be visible at both the tundish and the final point of discharge, but where this is not possible or practically difficult; there should be clear visibility at one or other of these locations. Examples of acceptance are: i) Ideally below a fixed 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. Fig. 4 Suggest ways of terminating discharge pipes safety Temperature & pressure relief valve Metal discharge pipe (D1) from temperature & pressure relief valve to tundish. 600 mm Max. Tundish 300 mm Min. Metal discharge pipe (D2) from tundish with continuous fall. See Table 2 and worked example. Discharge below fixed grating. (see page 6 for alternative points of discharge). Fixed grating. Trapped gulley 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). iv) Where a single pipe serves a number of discharges, such as in blocks of flats, the number served should be limited to not more than 6 systems so that any installation can be traced reasonably easily. The single common discharge pipe should be at least one pipe size large than the largest individual discharge pipe to be connected. If unvented hot water storage systems are installed where discharges from safety devices may not be apparent i.e. in dwellings occupied by the blind, infirm or disabled people, consideration should be given to the installation of an electronically operated device to warn when discharge takes place. Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges. 11 / EN