Daikin RWEYQ8T9Y1B Installation And Operation Manual

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Contents

4 PreparationInstallation and operation manual11RWEYQ8~14T9V1B+RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1A – 2017.04▪ Filter. Install the filter in the water piping inlet within a distance of1.5 m from the outdoor unit. If sand, waste or rust particles aremixed in the water circulation system, metal materials will becomecorroded.▪ Insulation. Insulate up to the base of the heat exchanger.≥80 mmbl gdeeaijckhfa Air purge (field supply)b Water outletc Water inletd Shut-off valve (field supply)e Water connectionf Water piping (field supply)g Insulation (field supply)h Heat exchangeri Filter (accessory)j Drain valve (field supply)k Drain connectionl Insulation cover▪ Water pump. After filling the water piping, run the water pump(field supply) to flush the water piping. After flushing, clean thefilter.▪ Freeze. Protect against freezing.▪ Water pipes. ALWAYS comply with local and national regulations.▪ Water piping – Tightening torque. Securely tighten the waterpiping with a tightening torque of ≤300 N•m. Overtightening resultsin damage to the unit.▪ Field supply components – Water. Only use materials that arecompatible with water used in the system and with the materialsused in the outdoor unit.▪ Field supply components – Water pressure and temperature.Check that all components in the field piping can withstand thewater pressure and water temperature.▪ Water pressure. The maximum water pressure is 37 bar. Provideadequate safeguards in the water circuit to ensure that themaximum pressure is NOT exceeded.▪ Drainage – Low points. Provide drain taps at all low points of thesystem in order to allow complete drainage of the water circuit.▪ Drainage – Clogging. Make sure that the water runs smoothlywithout any clogging by dirt.▪ Drainage – Lateral length. Lateral length of drainage should beas short as possible (≤400 mm) and installed in a downwarddirection. The diameter of the drain pipe must be the same as thediameter of the pipe on the outdoor unit.▪ Non-brass metallic piping. When using non-brass metallicpiping, insulate the brass and non-brass properly so that they doNOT make contact with each other. This to prevent galvaniccorrosion.4.3.2 Handling the brazed plate heat exchangerINFORMATIONA brazed plate heat exchanger is used. Because of adifferent structure from a conventional heat exchanger, itMUST be handled in a different manner.▪ Install a water filter at the water inlet in order to prevent foreignmaterials such as dust, sand,… from entering the plate heatexchanger.▪ Scale can stick to the plate heat exchanger depending on waterquality. To remove scale, cleaning is necessary at regularintervals using chemicals. Install a shut-off valve at the end in thewater piping. Install a piping connection port on the pipingbetween this shut-off valve and the outdoor unit for cleaning bychemicals.▪ For cleaning and water draining of the outdoor unit (long period ofnon-use or during non-use in winter), install an air purge plug (forjoint use with cleaning port) (field supply) and a water drainingplug at the inlet/outlet ports of the water piping. Additionally, installan automatic air purge valve (field supply) at the top of risingpiping or at the top of a portion where air tends to stay.▪ Install an additional cleanable filter (field supply) in front of thepump inlet.▪ Carry out complete cooling/thermal insulation of the water pipingand the outdoor unit drain piping. If insulation has not been carriedout, the unit may sustain damage during severe winters due tofreezing, in addition to thermal loss.▪ When you stop the unit during night or winter, take measures toprevent water circuits from natural freezing in areas where theambient temperature drops below 0°C (by water drain off, keepingthe circulation pump running, warming up by a heater,…).Freezing of water circuits may result in damage to the plate heatexchanger. Therefore, take appropriate measures depending onthe circumstances.a b c defghia Water inlet pipingb Filter (accessory)c Air purge plug (for joint use with cleaning port) (fieldsupply)d Cleaning devicee Filter for pump (field supply)f Automatic air purge valve (field supply)g Water outlet pipingh Joint use with water draining plugi Plate heat exchanger4.3.3 About the water flow rateThe RWEYQ*T9Y1B models are equipped with the logic to operatewith a variable water flow rate function.abca Constant flowb Flow regulating valve (field supply)c Inverter pump (field supply)A system can either be configured as a constant flow system (a), avariable flow system with valve (b) or a variable flow system with apump (c).▪ Constant flow system (a): the variable water flow rate function isnot used.▪ A pressure independent flow regulating valve (b): the valvecontrols the flow rate of a centralized inverter pump through theunit.▪ Inverter pump (c): the pump directly controls the water flow ratethrough the unit.