Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

Also see for ecoTEC exclusive 832: Installation and maintenance instructions Installation and maintenance instructions

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25ecoTEC exclusive installation and maintenance instructions / 0020017768_0420 mbar when the appliance is operating at the maxi-mum heat input. The inlet working pressure to the appli-ance is measured at the appliance multi-functional gasvalve on the valves inlet pressure test point, see fig. 6.5.Due to internal appliance pressure losses the reading atthe inlet of the appliance gas valve may be lower thanthe design pressure of 20 mbar.The acceptable pressure measured at the appliance gasvalve inlet is:Natural Gas(G20)Meter outlet pressure Minimum pressureat gas valve inletecoTEC ex-clusive832MaximumDesign (nominal)Minimum23 mbar21 mbar19 mbar20 mbar18 mbar16 mbarecoTEC ex-clusive838MaximumDesign (nominal)Minimum23 mbar21 mbar19 mbar19.5 mbar17.5 mbar15.0 mbarTable 6.3 Acceptable pressure measured at the appliance gasvalve inleth Note!In all instances the gas rate to the applianceshall be measured.a Caution!Should the pressure recorded at the gas meternot be between 19 mbar and 23 mbar then theEmergency Service Provider should be contact-ed.a Caution!Should the pressure at the gas meter be cor-rect but lower pressure at the gas valve thanindicated in the above table, it may indicateblockage in the internal pipework or that thepipework is undersized. Rectification work mustbe undertaken before the appliance is commis-sioned.6.2.2 Checking the connection pressure(gas inlet working pressure)Proceed as follows to check the connection pressure:• Remove the front cover from the device.• Close the gas isolation cock on the unit.21Fig. 6.5 Checking the gas supply pressure• Release the sealing screw marked "in" (1) on thegas fitting.• Connect a digital pressure manometer or u-gaugemanometer (2).• Open the gas isolation cock on the unit.• Start the appliance up via P.1 (see Chapter 9.2).• Measure the connection pressure in comparisonwith atmospheric pressure.a Natural gas:If the connection pressure is outside the range19 to 23 mbar, no adjustment should be under-taken, and the unit must not be started up!a Liquid gas:If the connection pressure is outside the range25 to 45 mbar, no adjustment should be under-taken, and the unit must not be started up!If the connection pressure is within the permissiblerange, proceed as follows:• Take the appliance out of operation.• Close the gas isolation cock on the unit.• Remove the pressure gauge and screw the sealingscrew (1) back in again.• Open the gas isolation cock on the unit.• Make sure that the sealing screw is not leaking.• Put the front cover back on and turn on the device.Start-up 6