Daikin EKHBRD011ADV1 Installation Manual

Also see for EKHBRD011ADV1: Operation manual

Installation manual13 EKHBRD011~016ADV1+Y1Indoor unit for air to water heat pump system4P402191-1A – 2015.04Checking the water volume and expansion vesselpre-pressureThe unit is equipped with an expansion vessel of 12 litre which has adefault pre-pressure of 1 bar.To assure proper operation of the unit, the pre-pressure of theexpansion vessel might need to be adjusted and the minimum andmaximum water volume must be checked.1 Check that the total water volume in the installation, excludingthe internal water volume of the unit, is 20 l minimum.2 Using the table and instructions below, determine if theexpansion vessel pre-pressure requires adjustment anddetermine if the total water volume in the installation is below themaximum allowed water volume.Calculating the pre-pressure of the expansion vesselThe pre-pressure (Pg) to be set depends on the maximum installationheight difference (H) and is calculated as below:Pg=(H/10+0.3) barChecking the maximum allowed water volumeTo determine the maximum allowed water volume in the entire circuit,proceed as follows:1 Determine for the calculated pre-pressure (Pg) thecorresponding maximum water volume using the graph below.2 Check that the total water volume in the entire water circuit islower than this value.If this is not the case, the expansion vessel inside the indoor unit istoo small for the installation.In most applications this minimum water volume will have asatisfying result.In critical processes or in rooms with a high heat loadthough, extra water volume might be required.When circulation in each space heating/radiator loop iscontrolled by remotely controlled valves, it is important thatthis minimum water volume of 20 l is kept even if all thevalves are closed.Example1 Outdoor unit 10 Radiator (field supply)2 Indoor unit 11 Electronic expansionvalve3 Refrigerant heatexchanger C1 Remote controller4 Water heat exchanger M1...M3 Individual motorized valveto control loop radiators(field supply)5 Compressor6 Pump T1...T3 Individual roomthermostat (field supply)7 Shut-off valve8 Collector (field supply) A Installation space9 By-pass valve(field supply)B Living room7 7 8432 91 6 105T3T2A BC1M3M2M1T11111Installationheightdifference(a)(a) Installation height difference: height difference (m) between the highest pointof the water circuit and the indoor unit. If the indoor unit is located at thehighest point of the installation, the installation height is considered 0 m.Water volume65°C ≤270 l80°C ≤180 l65°C >270 l80°C >180 l≤7 m No pre-pressure adjustmentrequired.Actions required:• pre-pressure must bedecreased, calculateaccording to "Calculatingthe pre-pressure of theexpansion vessel"• check if the water volumeis lower than maximumallowed water volume(use graph below)>7 mActions required:• pre-pressure must beincreased, calculateaccording to "Calculatingthe pre-pressure of theexpansion vessel"• check if the water volumeis lower than maximumallowed water volume(use graph below)Expansion vessel of the unittoo small for the installation.= pre-pressure= maximum water volume= increase pre-pressure vessel volume= decrease pre-pressure vessel volume0.30.510.01.522.5100500 20 150 200 250 300 350 400 450maximum water volume [l]pre-pressure [bar]8080°C6565°C80°C65°C