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8 months ago

Andris R - User & Installation Manual

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

iii) Discharges at high

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 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. Discharge below fixed grating. (see page 6 for alternative points of discharge). Metal discharge pipe (D2) from tundish with continuous fall. See Table 2 and worked example. Fixed grating. Trapped gulley 14 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. Table 2 Sizing of copper discharge pipe “D2” for common temperature valve outlets. Valve outlet size Minimum size of discharge pipe D1* Minimum size of discharge pipe D2* from tundish G 1/2 15 mm 22 mm 28 mm 35 mm G 3/4 22 mm 28 mm 35 mm 42 mm G 1 28 mm 35 mm 42 mm 54 mm Maximum resistance allowed, expressed as a length of pipe (i.e. no elbow or bends) Up to 9 m Up to 18 m Up to 27 m Up to 9 m Up to 18 m Up to 27 m Up to 9 m Up to 18 m Up to 27 m Resistance created by each elbow or bend 0.8 m 1.0 m 1.4 m 1.0 m 1.4 m 1.7 m 1.4 m 1.7 m 2.3 m 12

Worked example The example below is for a G 1/2” temperature & pressure relief valve with a discharge pipe (D2) having 4 no. elbows and length of 7 m from the tundish to the point of discharge. From Table 2 Maximum resistance allowed for a straight length of 22 mm copper discharge pipe (D2) from G 1/2” T & P valve is 9 m. Subtract the d) resistance ELECTRICAL for 4 no. 22 WARNING: mm elbows at 0.8 m each = 3.2 m. Therefore the The maximum appliance permitted must length be equates earthed to: 5.8 m. As 5.8 m is less The than electrical the actual installation length of 7 m must therefore be in calculate line with the next the largest current size. I.E.E. wiring regulations. Maximum resistance allowed for a straight length of 28 mm pipe (D2) from G 1/2” T & P valve equates to: 18 m. Subtract the A resistance mains supply for 4 no. of 28 240 mm elbow VAC at 31.0 kW m (13 each amps) = 4 m. is required (Fig. 5) Therefore the Heat maximum resisting permitted cable, length round equates 3 to: core 14 m1.5 mm (to BS 6141 table 8) should be used to As the actual connect length is to 7 m, the a 28 electrical mm (D2) copper supply pipe through will be satisfactory. either: d) ELECTRICAL - a 13 WARNING: amp socket to BS 1363; or The appliance - a must double be earthed pole fused isolating switch with a contact separation of 3 mm minimum on The electrical each installation pole. must be in line with the current I.E.E. wiring regulations. A mains supply of 240 VAC 3 kW (13 amps) is required (Fig. 5) Heat resisting The cable, cable round enters 3 core the 1.5 mm terminal (to BS 6141 compartment table 8) should through be used a to tube connect embedded to the electrical in the supply foam through either: - a 13 amp socket insulation, to BS 1363; the entrance or to this tube is on the rear right hand side at the bottom. - a double pole fused isolating switch with a contact separation of 3 mm minimum on each pole. The cable enters Flexible the terminal cables compartment are colour through coded a tube as follows: embedded in the foam insulation, the entrance to this tube is on the rear Brown.................................................. right hand side at the bottom. live Flexible cables are colour coded as follows: Brown.................................................. Blue............................................... live neutral Blue............................................... Green and yellow............................. neutral earth Green and yellow............................. earth Fig. 5 Wiring Diagram THERMAL CUT-OUT THERMOSTAT HEATING ELEMENT NEON L N E To enter into To the enter terminal into compartment the terminal unscrew compartment the 2 screws on unscrew the cover. the 2 screws on the cover. (To access the screws, remove the decorative caps on the front control access panel). (To access the screws, remove the decorative caps on the front control access panel). e) COMMISSIONING - Check that all the necessary components are supplied and for those not factory fitted, that they are the type recommended e) COMMISSIONING by the manufacturer for the particular water heater. - Check that - Check the water that heater/components all the necessary are undamaged. components are supplied and for those not factory - Check that the discharge pipe is plumbed so that it falls continuously and that no taps, valves or other shut-off devices are fitted, installed that in the they pipe. are the type recommended by the manufacturer for the particular water heater. - Check that the water heater/components are undamaged. 13 - Check that the discharge pipe is plumbed so that it falls continuously and that no

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