Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

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Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual Manual pdf 15 page image

Installation 50020261389_02 ecoTEC plus Installation and maintenance instructions 15▶ In order to control the cylinder's post-heating, connecta VR 10 temperature sensor or a thermostat to the plugthat is connected to the main PCB.Wiring diagram (→ Page 50)▶ Set diagnostics code D.026 to 1.Overview of diagnostics codes (Applicability: VU 446/5-5 (H-GB) OR VU 606/5-5 (H-GB)) (→ Page 42)5.2 Selecting the domestic hot water cylinderThe product can control an optional domestic hot water cylin-der (recommended option for products with an output below50 kW).▶ Use a low loss header for products that are connected toa domestic hot water cylinder and have a domestic hotwater output requirement of over 50 kW, . (→ Page 15)▶ Use the following components to connect the domestichot water cylinder:Domestic hot water cylinderCylinder Internal dia-meter of theconnectionVU 446/5-5 (H-GB) VIH R 300 20 mmVU 606/5-5 (H-GB) VIH R 500 25 mm5.3 Selecting a low loss headerThe low loss header disconnects the heat generator hydraul-ically from the heating system. This prevents feed head in-teractions between the individual circulation pumps. Further-more, the low loss header ensures that a sufficient minimumvolume of water continuously circulates through the heatgenerator.▶ Observe the information on treating heating water.(→ Page 21)▽ If you cannot guarantee the conditions for treatingthe heating water, install an external plate heat ex-changer to protect the product.Low loss headerHeating system spread10 K 15 K 20 KVU 446/5-5 (H-GB) WH 95 WH 40-2 WH 40-2VU 606/5-5 (H-GB) WH 160 WH 95 WH 40-2▶ Observe the instructions for the low loss header.You do not require any electronic accessories when usinga low loss header. You can connect simple installations dir-ectly inside the electronics box.▶ Observe the wiring diagram.Wiring diagram (→ Page 50)5.4 Requirements▶ Make sure that the existing gas meter is capable ofpassing the rate of gas supply required. (→ Page 62)▶ If the hydraulic circuit contains a pump other than the onefor the product, only start up the product if a sufficientlydimensioned low loss header is installed between theheat generator circuit and the heating circuit or the cylin-der charging circuit.Low loss header (→ Page 15)▶ If the product's pump is the only circulation pump in thehydraulic circuit, check whether the product's feed headis sufficient for the installation. (→ Page 30)▽ If this is not the case, use an appropriately designedlow loss header and circulation pump.▶ Ensure that the installation has the following compon-ents:– A gas stopcock for the unit– A filling/draining device in the heating installation▶ With older installations in particular, install a magneticfilter at the heating circuit return in order to protect theproduct against dirt from the installation.– Ensure that there is sufficient dimensioning in orderto prevent it from blocking quickly and to prevent highpressure losses.5.4.1 Information on liquid gas operationIn the as-supplied condition, the product is preset for opera-tion with the gas group indicated on the data plate.Applicability: Except Great BritainIf you have a product that has been preset for operation withnatural gas, you must convert it to run on liquid gas. You willneed a conversion set for this. The conversion procedureis described in the instructions supplied with the conversionset.5.4.2 Purging the liquid gas tankIf the liquid gas tank is not purged properly, this may result inignition problems.▶ Ensure that the liquid gas tank has been purged properlybefore installing the product.▶ If required, contact the filler or the liquid gas supplier.5.4.3 Using the correct gas typeUsing the incorrect gas type may cause fault shutdowns inthe product. Ignition and combustion noise may occur in theproduct.▶ Only use the gas type listed on the data plate.