Daikin Altherma EHVH04SU18CB6W Installation Manual
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8 Maintenance and serviceInstallation manual24EHVH04+08SU18CB6W + EHVH08~16SU26CB6WDaikin Altherma – Low temperature split4P449980-1B – 2016.11Pressure relief valve of the domestic hot water tankCheck for correct operation of the pressure relief valve of thedomestic hot water tank. To ensure free water flow through thedischarge pipe, manually operate it by turning its knob left.Booster heater of the domestic hot water tankIt is recommended to remove lime buildup on the booster heater toextend its life span, especially in regions with hard water. To do so,drain the domestic hot water tank, remove the booster heater fromthe domestic hot water tank and immerse in a bucket (or similar) withlime-removing product for 24 hours.Switch box▪ Carry out a thorough visual inspection of the switch box and lookfor obvious defects such as loose connections or defective wiring.▪ Using an ohmmeter, check if contactors K1M, K2M, K3M and K5M(depending on your installation) operate correctly. All contacts ofthese contactors must be in open position when the power isturned OFF.WARNINGIf the internal wiring is damaged, it has to be replaced bythe manufacturer, its service agent or similarly qualifiedpersons.DescalingDepending on water quality and set temperature, scale can depositon the heat exchanger inside the domestic hot water tank and canrestrict heat transfer. For this reason, descaling of the heatexchanger may be required at certain intervals.Chemical disinfectionIf the applicable legislation requires a chemical disinfection inspecific situations, involving the domestic hot water tank, please beaware that the domestic hot water tank is a stainless steel cylindercontaining an electronic anode. We recommend to use a non-chloride based disinfectant approved for use with water intended forhuman consumption.NOTICEWhen using means for descaling or chemical disinfection,it must be ensured that the water quality remains compliantwith EU directive 98/83 EC.AnodeNo maintenance or replacement required.Pressure reducing valve of the domestic hot water tank kitDepending on local water conditions, annual inspection of theintegral line strainer, pressure reducing valve cartridge, and seatingmay be necessary.▪ Unscrew the retaining nut of the valve. The complete operatingmechanism, including the strainer, can be removed.▪ Clean the filter mesh and cartridge under running water.▪ Replace cartridge, ensuring that the strainer is correctly located,and reassemble the unit.Pressure relief valve of the domestic hot water tank kitCheck for correct operation of the pressure relief valve. To ensurefree water flow through the discharge pipe, manually operate it byturning its knob left. Water may be very hot!Checkpoints are:▪ The water flow coming from the relief valve is high enough, noblockage of the valve or in between piping is suspected.▪ Dirty water coming out of the relief valve:▪ open the valve until the discharged water does not contain dirtanymore▪ flush and clean the complete tank, including the piping betweenthe relief valve and cold water inlet.To make sure this water originates from the tank, check after a tankheat up cycle. It is recommended to do this maintenance morefrequently.Depending on local water conditions, annual inspection of thepressure relief valve cartridge and seating may be necessary.▪ Unscrew the pressure relief headwork from the valve body.▪ Clean the valve seat face and seating. Do NOT scratch ordamage them.▪ Refit in reverse order. Do NOT overtighten.8.2.1 To drain the domestic hot water tankPrerequisite: Switch OFF the power supply.Prerequisite: Turn OFF the cold water supply.1 Open the front panel.2 Remove the 2 screws, unhook and put the switch box aside.2×3 The drain hose is located at the right side of the unit. Cut the tiewraps or tape and bring the flexible drain hose forward.aa Drain hoseINFORMATIONTo drain the tank, all the hot water tapping points need tobe opened to allow air to enter the system.4 Open the drain valve. |
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