Daikin EBHQ006BAV3 Installation Manual

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Daikin EBHQ006BAV3 Installation Manual Manual pdf 21 page image

EBHQ006+008BAV3 + EKCBX/H008BAV3Unit for air to water heat pump system4PW64602-1A – 09.2010Installation manual19Calculating the pre-pressure of the expansion vesselThe pre-pressure (Pg) to be set depends on the maximuminstallation height 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 unit is too smallfor the installation.Example 1The outdoor unit is installed 5 m below the highest point in the watercircuit. The total water volume in the water circuit is 100 lIn this example, no action or adjustment is required.Example 2The outdoor unit is installed 4 m below the highest point in the watercircuit. The total water volume in the water circuit is 190 l.Result:■ Since 190 l is higher than 170 l, the pre-pressure must bedecreased (see table above).■ The required pre-pressure is:Pg = (H/10 + 0.3) bar = (4/10 + 0.3) bar = 0.7 bar■ The corresponding maximum water volume can be read fromthe graph: approximately 200 l.■ Since the total water volume (190 l) is below the maximum watervolume (200 l), the expansion vessel suffices for the installation.10.3. Setting the pre-pressure of the expansion vesselWhen it is required to change the default pre-pressure of theexpansion vessel (1 bar), keep in mind the following guidelines:■ Use only dry nitrogen to set the expansion vessel pre-pressure.■ Inappropriate setting of the expansion vessel pre-pressure willlead to malfunction of the system. Therefore, the pre-pressureshould only be adjusted by a licensed installer.10.4. Connecting the water circuitWater connections must be made in accordance with local andnational regulations and the outlook drawing delivered with the unit,respecting the water in- and outlet.If dirt gets in the water circuit, problems may occur. Therefore, alwaystake into account the following when connecting the water circuit:■ Use clean pipes only.■ Hold the pipe end downwards when removing burrs.■ Cover the pipe end when inserting it through a wall so that nodust and dirt enter.■ Use a good thread sealant for the sealing of the connections.The sealing must be able to withstand the pressures andtemperatures of the system, it must also be resistant to the usedglycol in the water.■ When using non-brass metallic piping, make sure to insulateboth materials from each other to prevent galvanic corrosion.■ Because brass is a soft material, use appropriate tooling forconnecting the water circuit. Inappropriate tooling will causedamage to the pipes.■ Increasing the distance between shut-off valves is necessary forease of installation.Installation example1 To secure the piping of the unit2 To connect the shut-off valve3 Water inlet4 Water outlet5 Round socket 2x 1" FBSP (field supply)6 1" MBSP pipe end (field supply)Installationheightdifference (a)(a) Installation height difference: height difference (m) between the highest point ofthe water circuit and the unit. If the unit is located at the highest point of theinstallation, the installation height is considered 0 m.Water volume≤170 l >170 l≤7 m No pre-pressure adjustmentrequired.Actions required:• pre-pressure must bedecreased, calculateaccording to "Calculating thepre-pressure of theexpansion vessel"• check if the water volume islower than maximum allowedwater volume (use graphbelow)>7 mActions required:• pre-pressure must beincreased, calculateaccording to "Calculating thepre-pressure of theexpansion vessel"• check if the water volume islower than maximum allowedwater volume (use graphbelow)Expansion vessel of the unittoo small for the installation.= pre-pressure= maximum water volumeA = System without glycolB = System with 25% propyleen glycol0.30.511.522.5100500 10 150 200 250 300 350 400 450maximum water volume [l]pre-pressure [bar]ABWARNINGBe careful not to deform the unit piping by using excessiveforce when connecting the piping.1 524364 3