1 General safety precautionsInstallation and operating instructions5Gas Combi UnitFloor-standing gas condensing boiler with integrated heat storage008.1543899_02 – 04/2019 – EN1 General safety precautions1.1 Particular safety instructionsWARNINGHeaters that have not been set up andinstalled correctly can impair the func-tion of the heater and/or cause seriousor fatal injuries to the user.▪ Work on the device (such as set-up,servicing, connection and initial com-missioning) must only be carried outby persons who are authorised andhave successfully completed quali-fying technical or vocational train-ing and who have taken part in ad-vanced training sessions recognisedby the relevant responsible authorit-ies for the specific activity. These in-clude, in particular, certified heatingengineers, qualified electriciansand HVAC specialists who, be-cause of their professional trainingand expert knowledge, have exper-ience in the professional installationand maintenance of heating sys-tems, gas installations and hot waterstorage tanks.WARNINGDisregarding the following safety in-structions may result in serious phys-ical injury or death.▪ This device may only be used bychildren aged 8 and above and bypersons with restricted physical,sensory or mental capabilities or witha lack of experience and knowledgeif they are under supervision or ifthey have been instructed in the safeuse of the equipment and under-stand the dangers arising therefrom.Children must not play with thedevice. Cleaning and user mainten-ance must not be carried out bychildren without supervision.▪ Establish the power supply in ac-cordance with IEC 60335-1, via aseparate isolator which separates allpoles with a contact opening dis-tance that provides full disconnectionin accordance with overvoltage cat-egory III.▪ All the electrical work must only becarried out by electrically qualifiedexperts and with consideration of thelocal and national regulations, andthe instructions in this manual.Ensure that a suitable electrical cir-cuit is used.Insufficient load capacity of the elec-trical circuit or improperly executedconnections can result in electricshock or fire.▪ The customer must install a pressurerelief device with a rated over-pres-sure of less than 0.6 MPa (6 bar).The connected drain line must havea continuous gradient and a free out-let into a frost-free environment(see Chap. 4.4).▪ Water may drip out of the drain lineof the pressure relief device. Thedrain opening must be left open toatmosphere.▪ The pressure relief device must beoperated regularly in order to re-move scale deposits and to makesure it is not blocked.▪ The storage tank and hot water cir-cuit can be drained. The instructionsin Chap. 11.1 must be observed.▪ All work on gas-carrying parts mustonly be carried out by gas-relatedqualified experts and with considera-tion of local and national regulationsand the instructions in this manual.▪ Improperly performed work on gas orgas-carrying lines can endanger lifeand health and hinder the operationof the heater.