Marley Sustainable Drainage Rainwater Harvesting Kits ... - BHL.co.uk

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RAINWATER HARVESTING KITS - INSTALLATION MANUAL Key H – Height of overflow opening W – Width of overflow opening h – Critical water level A – Vertical distance from lowest inlet to critical water level (Air gap) Calculations The distance ‘A’ is calculated from the expression: Where D1 and D2 are the internal pipe diameters of the mains and recycled water inlets. For 15mm Equator pipes, the calculated distance ‘A’ is 33mm Width of overflow opening, W = 10h (minimum) Height of overflow opening, H = 2D + h (minimum) Measurements The position and size of the overflow opening is based on the critical water level, h. This is determined from testing under a worst case fault condition with both inlet valves open and any optional overflow pipes blocked. In order to test under this condition, it will be necessary to override the solenoid valve function by disconnecting one of the solenoid supply cables in the control housing (see figure 12 on previous page). The float arms on both valves can be momentarily depressed to simulate the fault condition. The critical water level ‘h’ is the height of water level above the overflow lip 2 seconds after the valves are closed. For any given set of flow and pressure conditions the value of ‘h’ will be dependant on the width of the overflow lip ‘W’, so in the first instance it is suggested that a value of 10mm is assumed, giving an overflow width of 100mm and height ‘H’ of 33mm/ Carry out an initial test with the overflow lip positioned at the calculated distance ‘A’ below the inlet of the recycled water valve. Having measured ‘h’ 2 seconds after closing the inlet valves, lower the lip by this amount and adjust the opening width if necessary to maintain the correct proportions (10h), then retest. Note, under peak flow conditions with both valves open and the optional overflow blocked, the water level in the tank must not come into contact with the mains inlet valve. Once the overflow opening has been correctly sized and positioned, set the float valves on the mains and re-cycled water valves to maintain a suitable water level below the overflow lip or optional overflow pipe. Reconnect the solenoid valve supply cable in the control housing. Fit a lid to the tank and a byelaw 50 insulation jacket, making sure that the overflow is not obstructed. Provision should be made to collect and drain any overflow water by standing the header tank in a tray with a suitably sized outlet. Full details of calculated and measured methods for determining the size and position of the overflow outlet are given in BS EN 13077:2003. Devices to prevent pollution by backflow – air gap with noncircular overflow (unrestricted) – family A, type B. Safety Labels Filter installation Safety labels are provided with the kit and should be applied to the finished installation as follows to ensure safe operation. • Access cover warning – apply labels to the inside rim of the inspection cover frame or to the inside surface of the access riser section • Do not drink – apply to a flat wall surface adjacent to the outside tap (where fitted). If no suitable surface is available, fix a piece of weatherproof ply or similar to use as a mount. • Reclaimed Water – apply to exposed sections of the supply pipe serving any outside tap, the pipe fittings assembly of the domestic back up system and the inlet pipe to the header tank. With the inspection cover removed, hold the filter housing by the inlet connection on the cover and insert the outlet into the corner hole in the base of the inlet chamber. Manoeuvre the pump hose and cables into position so that they are located in the gaps between the filter housing and the well hole, then position the housing so that the two stepped support legs are firmly located across the well. Fit the inlet hose elbow to the inlet spigot on the filter housing cover. 14
RAINWATER HARVESTING KITS - INSTALLATION MANUAL Commissioning Before commissioning the system the tank must be partially filled with clean water to a minimum depth of 250mm from the base of the pump. (Approximately 1000 litres). With the pump sitting in the bottom housing, bleed the air from the pump body by loosening the upper hose clip and releasing the hose from the Equator fittings assembly. Reconnect the hose and tighten the hose clip. The control housings have two ‘touch sensitive’ pads on the fascia which are operated by momentarily holding a finger on the surface until the appropriate light is illuminated or extinguished. The following procedure enables the control system to determine the ‘closed valve’ and ‘normal’ operating pressures with a garden hose and fitting attached or with the header tank inlet valve fully open. The system will then monitor the pressure during use so that the pump cuts out when the pressure reaches the closed valve condition. The pressure setting will be retained once calibrated and should be adequate for 12mm bore hoses at lengths up to 60m. If a longer hose is subsequently fitted and it is found that the pump will not operate or operates intermittently, it might be necessary to re-calibrate. The level display for USW200 installations operates by measuring the pressure head of the water level in the tank and uses the full tank condition as a datum for calibration. The function of the pump is not dependent on calibration of the level display, so if required, this operation can be deferred until the tank is fully replenished with rainwater. USW100 - pump calibration a.Connect the 240V power supply to the system and leave the panel in the off state b.Press both buttons. The lower calibration LED will be lit. c.Ensure that the tap is shut and that there is no water flow. d.Press the right hand button. Both calibration LED’s will now be lit. e.Connect the hose and any fittings to the tap. Open the tap and the fitting fully so that the water flows. f.Press the right hand button one last time. g.The calibration of the pump is now complete. The unit will return to the off state. USW200 - pump calibration a.Connect the 240V power supply to the system and leave the panel in the off state b.Press both buttons. The top and bottom level display LED’s will light. c.Press the right hand button. The top LED will go out leaving the bottom one lit. d.Ensure that the header inlet valve is shut or isolated and that any outside tap connected to the system is shut. e.Press the right hand button again. The lower two LEDs will now be lit. f.Open the header inlet valve and allow water to flow into the tank. (Any outside tap connected to the system should remain closed during this operation). g.Press the right hand button one last time. h.The calibration of the pump in now complete. The unit will return to the off state. Calibration of level display a. Press both buttons. The top and bottom level display LEDs will light. b. Press the left hand button. The lower level indicator led will go out leaving the top one lit. c. Ensure that the tank is full and that the level sensing tube is in its correct position. d. Press the left hand button. e. The level calibration is now complete. f. All four level LEDs will be lit and the unit will return to the off state. If difficulty is experienced calibrating the level display, lift the pump from the well and check that there are no water and air pockets trapped in the end of the tube. If there are pockets present, disconnect the tube from the control housing and blow through with a hand pump or compressed air supply. Reconnect the tube to the control housing port first then lower the pump into the well. Operation USW100 To operate, ensure that the RCD serving the installation is activated. Depress the ‘POWER’ button of the control panel until the power light is illuminated. The pump will momentarily pressurise the system ready for use, then shut down. When using a hose attachment such as a trigger operated jet, there will be a few seconds delay when the tap is opened and the trigger depressed. Open the tap fully and keep the trigger depressed for approximately 5 seconds to allow the pump to activate and repressurise the system. If the water level in the tank drops below the minimum level, the ‘EMPTY’ light on the control panel will be lit and the pump will shut down until the water is replenished. Normally, the unit should be turned off after use, but during the winter months, if the control panel is fitted outside it is advisable to leave it switched on USW200 To charge the system ready for use, firstly open any isolation valves in the re-cycled and mains water pipes. Ensure that the RCD serving the installation is activated. Depress the ‘POWER’ button of the control panel until the power light is illuminated. Providing that there is an adequate volume of water in the storage tank, the header tank will fill with re-cycled water. The pump will then shut down until water is drawn from the system. If the storage tank is empty when the system is turned on at the control panel, the ‘EMPTY’ light will be illuminated, the mains water solenoid valve will open and the header tank will fill via the mains water inlet valve. In the event of power failure to the control panel, the solenoid valve will automatically open to allow the header tank to operate from the mains water supply. When power is restored, the panel will need to be turned on again, otherwise both re-cycled and mains water supplies to the header tank will be cut off. The control panel incorporates a timer facility which activates the ‘clean filter’ reminder light. The solenoid valve is also activated periodically to ensure that it is ‘exercised’ when the system is mainly operating from re-cycled water. 15
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Marley Sustainable Drainage Rainwater Harvesting Kits ... - BHL.co.uk

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