Vaillant ecoMAX pro 18E Instructions For Use Installation And Servicing

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Vaillant ecoMAX pro 18E Instructions For Use Installation And Servicing Manual pdf 14 page image

Instructions for Use, Installation and Servicing ecoMAX pro146.9.3 Pressure GaugeA pressure gauge with a set pointer and covering at least0 to 4 bar (0 to 60 lb/in2) shall be fitted permanently tothe system in a position where it can be seen whenfilling the system.6.9.4 Domestic Hot Water CylinderSINGLE FEED INDIRECT CYLINDERS ARE NOTSUITABLE. The domestic hot water cylinder must be ofthe double feed fully indirect coil type. It must be suitableforworking at a gauge pressure of 0.35 bar above the safetyvalve setting.6.9.5 Water Make upProvision should be made for replacing water loss fromthe system using a make up bottle mounted in a positionhigher than the top point of the system, connectedthrough a non-return valve to the return side of either theheating circuit or the hot water cylinder.Alternatively, provision for make up water should bemade using a proprietary filling loop.6.9.6 Filling a Sealed Water SystemProvision for filling the system at low level must be made.This can be achieved by the use of a proprietary fillingloop.6.9.1 Safety ValveA safety valve must be fitted to a sealed system.It shall be preset, non-adjustable with a lift pressure of3-bar, incorporating seating of a resilient material, a testdevice and a connection for drain.The safety valve discharge pipe must be routed tooutside the building, must not discharge above anentrance or window or any type of public access area, beclear of any electrical fittings and positioned so that anydischarge can be seen.6.9.2 Expansion VesselA diaphragm type expansion vessel, conforming to thecurrent issue of BS4814 (see also BS7074 Part 1 and 2).For IE the current edition of IS 813, must be connectedat a point close to the inlet side of the circulating pump,see the diagrammatic layout, Fig. 6.4. unless laid downdifferently by the manufacturer.The expansion vessel volume depends on the total watersystem volume and the initial system design pressure.For any system an accurate calculation of vessel size isgiven in the current issue of BS5449 and BS7074 Part 1.Example: For an initial design pressure of 0.7 bar, theminimum total vessel volume required is 0.063 x TotalSystem Volume.Note!A higher initial design pressure requires a largervolume expansion vessel.The charge pressure must not be less than thestatic head of the system, that is, the height of thehighest point of the system above the expansion vessel.6 Water systemFig 6.412999