Daikin EWAQ016CAW Installation And Operation Manual

Daikin EWAQ016CAW Installation And Operation Manual Manual pdf 8 page image

5 InstallationInstallation and operation manual8EWAQ016~064CAW + EWYQ016~064CAWPackaged air-cooled water chiller4P489435-1B – 2017.1000,511,522,530 50 100 150 200 250 300 350 400 450 500 550 600ABFCE33bDaa Pre-pressure (bar)b Maximum water volume (l) (water or water + glycol)A System without glycolB System with 30% ethylene glycolC System with 40% ethylene glycolD System with 30% propylene glycolE System with 40% propylene glycolF DefaultIf the total water volume in the entire circuit exceeds the maximumallowed water volume (see graph), an additional expansion vesselmust be installed in the field piping.The default value of pre-pressure (Pg) is for a height difference of7 m.If the height difference of the system is lower than 7 m AND thevolume in the system is less than the maximum allowed value at thatpre-pressure (Pg) (see graph), then NO pre-pressure (Pg)adjustment is required.4.2.4 Changing the pre-pressure of theexpansion vesselNOTICEOnly a licensed installer may adjust the pre-pressure of theexpansion vessel.When changing the default pre-pressure of the expansion vessel(1 bar) is required, take following guidelines into account:▪ Only use dry nitrogen to set the expansion vessel pre-pressure.▪ Inappropriate setting of the expansion vessel pre-pressure willlead to malfunction of the system.Changing the pre-pressure of the expansion vessel should be doneby releasing or increasing nitrogen pressure through the Schradervalve of the expansion vessel.aa Schrader valve4.2.5 To check the water volume: ExamplesExample 1The unit is installed 5 m below the highest point in the water circuit.The total water volume in the water circuit is 250 l.No actions or adjustments are required.Example 2The unit is installed at the highest point in the water circuit. The totalwater volume in the water circuit (no glycol used) is 420 l.Actions:▪ Because the total water volume (420 l) is more than the defaultwater volume (340 l), the pre-pressure must be decreased.▪ The required pre-pressure is:Pg=(0.3+(H/10)) bar=(0.3+(0/10)) bar=0.3 bar▪ The corresponding maximum water volume is approximately 490 l(see graph).▪ Because 420 l is lower than 490 l, the expansion vessel isappropriate for the installation.4.3 Preparing electrical wiring4.3.1 Safety device requirementsThe power supply must be protected with the required safetydevices, i.e. a main switch, a slow blow fuse on each phase and anearth leakage protector in accordance with the applicable legislation.Selection and sizing of the wiring should be done in accordance withthe applicable legislation based on the information mentioned in thetable below.Model Recommended fusesEWAQ/EWYQ016 25 AEWAQ/EWYQ021 32 AEWAQ/EWYQ025 32 AEWAQ/EWYQ032 40 AEWAQ/EWYQ040 50 AEWAQ/EWYQ050 63 AEWAQ/EWYQ064 80 ANOTICEWhen using residual current operated circuit breakers, besure to use a high-speed type 300 mA rated residualoperating current.5 Installation5.1 Opening the units5.1.1 To open the outdoor unitDANGER: RISK OF ELECTROCUTIONDANGER: RISK OF BURNINGTo gain access to the unit, front plates need to be opened as follows: