Daikin GCU compact Series Installation And Operating Instructions Manual

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Daikin GCU compact Series Installation And Operating Instructions Manual Manual pdf 29 page image

4 Set-up and installationInstallation and operating instructions29Gas Combi UnitFloor-standing gas condensing boiler with integrated heat storage008.1543899_02 – 04/2019 – ENWARNING (UK ONLY)If filling or topping up the storage tank is done by means ofthe boiler filling and drain valve, a temporary filling loopmust be used with the appropriate backflow preventiondevice in accordance with clause G24.2, Guidance to theWater Supply (Water Fittings) Regulations 1999.▪ Water shortage protection: The pressure and temperature mon-itoring of the GCU compact switches off the gas burner safely inthe event of water shortage (pressure sensor: monitor function)and locks it (STBK). No additional water shortage protection isneeded in the construction.▪ Avoid damage caused by deposits and corrosion: Observe therequirements on the heating water (see Chap. 1.2.5)DANGER: RISK OF BURNINGThere is a danger of scalding at hot water temperaturesover 60 °C. This is possible when using solar energy if anexternal heater is connected, the Legionella protection isactivated, or the hot water target temperature is set tomore than 60 °C.▪ Install scalding protection (hot water mixer device (e.g.VTA32)).4.6.3 Connecting the condensate drain andstorage tank overflowThe condensate produced during the cooling of the combustiongases in the boiler and in the flue gas system is led to the rear viathe condensate pipe integrated in the storage cover and then dis-charged into the drainage system via a drain hose to be installed onsite.A drain hose must also be connected to the overflow of the storagetank.1 Drain hoses (not included) with free inflow to the drains connec-tion.2 Secure drain hoses with hose clamps on connection nozzles.3 The complete outlet must not be lockable and must dischargethe condensation and any medium leaking due to damage(drinking water, buffer or heating water) outwards visibly (e.g.hose to flow drain or transparent outlet pipe).4 To avoid heat and water loss, a siphon filled with water must beused for the overflow hose (see Fig. 4-25).INFORMATIONThe condensate drain hose must be routed to the drainsconnection without a siphon in order to avoid backflowdue to double siphoning. The condensate drain siphon isintegrated in the storage cover. It must be filled with waterbefore commissioning the device.5 If local waste water regulations require the condensate to beneutralised, the condensate drain must be established via a suit-able neutralisation device.6 Check the condensate and overflow/drainage section for leaks.Fig. 4-25 Connection of the drain hoses for condensate drain andstorage tank overflow4.6.4 Installation of the DB connection kitThe optional DB connection kit allows better access for connectingthe DrainBack pipe (solar feed).Fig. 4-26 DB connection kit (example shows GCU compact 5xx)A DB pipe connection (solar inflow)B FlowSensor (not part of the DB connection kit, but includedin Solaris R3 control and pump unit)C Flow rate limiter (FlowGuard)D Solar inflow connection on the storage tank4.6.5 Installation of the P connection kitThe optional P connection kit for Biv device types allows better ac-cess for connecting the inflow and return flow lines of a pressurisedsolar system or another external heat generator on the storage tank.The kit contains two thermally insulated corrugated pipes that areconnected to the Biv connections of the storage tank via a union nut.At the other end of the corrugated pipes there is an adapter for dif-ferent connection sizes of the supply and return pipes.