Vaillant ecoMAX pro Instructions For Use Installation And Servicing

Also see for ecoMAX pro SERIES: Instructions for use installation and servicing Instructions for use installation and servicing

Vaillant ecoMAX pro Instructions For Use Installation And Servicing Manual pdf 10 page image

Water system 5Instructions for Installation and Servicing ecoMAX pro105.5 InhibitorAttention is drawn to the current issue of BS 5449 andBS 7593 on the use of inhibitors in central heatingsystems.If an existing system is to be reused take special care todrain the entire system, including the radiators, thenthoroughly cleaning out before fitting the boiler whetheror not adding an inhibitor.For advice please refer to 5.10, Water Treatment.5.6 Open (Vented) Water SystemThe boiler must be supplied from an unrestricted watersupply taken from a feed and expansion cistern situatedat a maximum height of 27 metres (90ft) above theboiler.The cold feed must be 15mm minimum size.The vent must rise continuously and be unrestricted.It is important that the relative positions of the pump,cold feed and open vent are as shown in Fig. 5.3.5.7 Domestic Hot Water CylinderWarning!Single feed indirect cylinders are not suitable.The domestic hot water cylinder must be of the doublefeed fully indirect coil type.5.8 Domestic Hot Water System - unventedWhere a storage system will not have a vent toatmosphere the installation must comply with the buil-ding regulations and local Water Company bylaws, seealso the current issue of BS5546 and BS6700.If fitting to an existing system the local authority shouldbe informed.Note!ecoMAX pro boilers are not suitable for use withVaillant VANTAGE unvented cylinders and MUSTnot be used in connection with these cylinders.Fig. 5.3Table 5.1 Flow rate5.3 PumpThe pump should be fitted on the flow pipe from theboiler and have isolating valves each side.A variable duty pump should be set to give atemperature difference of no greater than 20 °Cbetween the flow and return, with the thermostat set at“MAX”, which is about 80 °C, to give a flow rate asshown in table 5.1.See chart for pressure loss of the boiler, Fig. 5.1 or 5.2.High resistance microbore systems may require a higherduty pump.5.4 BypassA bypass is not required on the central heating systemunless all radiators are fitted with thermostatic radiatorvalves or the system controls could allow the boiler andpump to operate when there is no flow.Where a bypass has to be fitted, the bypass must be pla-ced at least 1.5 metres away from the boiler.Open (vented) system.Recommendedrelationship betweenpump, cold feed and vent.22mm (MIN.) VENTFEED ANDEXPANSION CISTERN15mm (MIN) COLD FEED15mm (MIN.) BY-PASS(if required)RETURNFLOWHEATINGCYLINDERPUMPBOILER 150mm MAX.1000mmMIN.450mmMIN.HEIGHTModel Minimum flow rateecoMAX pro 18 E 773.8 litres/hrecoMAX pro 28 E 1289 litres/hrThis is equal to 20 °C differential at maximum heat input.