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11 months ago

Andris R - User & Installation Manual

  • Text
  • Valve
  • Discharge
  • Heater
  • Fitted
  • Mains
  • Tundish
  • Appliance
  • Electrical
  • Reducing
  • Anode
  • Andris
  • Manual

1) Using the feed pipe

1) Using the feed pipe to accommodate expansion (Schedule 2, Section 6: Paragraph 15 of the Water Supply (Water Fittings) Regulations 1999 and the Water Byelaws 2000, Scotland) (Fig. 1). Do not fit 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 fitted regardless of expansion pipework installed. The expansion distances quoted are for 15mm pipes and can be approximately halved for 22mm pipes. 2) Using a set of expansion controls (Fig. 2 & 3). Fig. 2 (Models 10/15L) Pressure relief valve (6 bar) 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) Isolating valve (fixed jumper or 1/4 turn ball type) Dielectric junctions (must be fitted) Hot Cold KIT A Non-return valve Cold water mains Disharge Supply to other parts of plumbing system Fig. 3 (Models 30L) Temperature & pressure relief valve (7 bar / 90°C) Pressure relief valve (6 bar) Expansion vessel (charge set at 3.5 bar) Tundish Nearest cold water draw-off Pressure reducing valve (set at 3.5 bar) Isolating (fixed jumper or 1/4 turn ball type) Discharge to drain Hot Cold Dielectric junctions The tundish must be installed away from electrical devices. Non-return valve Cold water mains Supply to other parts of plumbing system 10

The model 30L 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; therefore a tundish (Kit C) is available for 10 and 15 litre units if required. 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 valve must be fitted between the expansion/pressure relief valve and the water heater. 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 guidelines refer to Building Regulation G3. It is good practice to follow these guidlines for all relief valve discharge pipe work. 1) The tundish must be vertical and fitted 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 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. 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 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. 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). 11