Daikin ERLQ004CA Installer's Reference Manual

Contents

5 Application guidelinesInstaller reference guide22ERLQ004~008CA + EHBH/X04+08CBDaikin Altherma – Low temperature split4P384972-1B – 2017.04PitDI abPi Power inputt TimeDI Digital input (power limitation level)a Power limitation activeb Actual power inputSetup and configuration▪ No additional equipment needed.▪ Set the power consumption control settings in [A.6.3.1] via theuser interface (for the description of all settings, see"8 Configuration" on page 46):▪ Select full time limitation mode▪ Select the type of limitation (power in kW or current in A)▪ Set the desired power limitation levelNOTICEMind the following guidelines when selecting the desiredpower limitation level:▪ Set a minimum power consumption of ±3.6 kW toguarantee defrost operation. Otherwise, if defrosting isinterrupted several times, the heat exchanger willfreeze up.▪ Set a minimum power consumption of ±3 kW toguarantee space heating and DHW production byallowing at least one electrical heater (backup heaterstep 1 or booster heater).5.6.2 Power limitation activated by digitalinputsPower limitation is also useful in combination with an energymanagement system.The power or current of the entire Daikin system is limiteddynamically by digital inputs (maximum four steps). Each powerlimitation level is set via the user interface by limiting one of thefollowing:▪ Current (in A)▪ Power input (in kW)The energy management system (field supply) decides the activationof a certain power limitation level. Example: To limit the maximumpower of the entire house (lighting, domestic appliances, spaceheating…).ab cA B CD12345A8PA Outdoor unitB Indoor unitC DHW tankD Energy management systema Power limitation activation (4 digital inputs)b Backup heaterc Booster heaterPitDI4DI3DI1 abPi Power inputt TimeDI Digital inputs (power limitation levels)a Power limitation activeb Actual power inputSetup▪ Demand PCB (option EKRP1AHTA) needed.▪ Maximum four digital inputs are used to activate thecorresponding power limitation level:▪ DI1 = weakest limitation (highest energy consumption)▪ DI4 = strongest limitation (lowest energy consumption)▪ For the specifications of the digital inputs, and for where toconnect them, refer to the wiring diagram.ConfigurationSet the power consumption control settings in [A.6.3.1] via the userinterface (for the description of all settings, see "8 Configuration" onpage 46):▪ Select activation by digital inputs.▪ Select the type of limitation (power in kW or current in A).▪ Set the desired power limitation level corresponding to each digitalinput.INFORMATIONIn case more than 1 digital input is closed (at the sametime), the digital input priority is fixed: DI4 priority>…>DI1.5.6.3 Power limitation processThe outdoor unit has better efficiency than the electrical heaters.Therefore, the electrical heaters are limited and turned OFF first.The system limits power consumption in the following order:1 Limits certain electrical heaters.If… has priority Then set the heater priorityvia the user interface to…Domestic hot water production Booster heater.Result: The backup heater willbe turned OFF first.Space heating Backup heater.Result: The booster heater willbe turned OFF first.2 Turns OFF all electrical heaters.3 Limits the outdoor unit.4 Turns OFF the outdoor unit.ExampleIf the configuration is as follows:▪ Power limitation level does NOT allow operation of both boosterheater and backup heater (step 1 and step 2).▪ Heater priority = Booster heater.Then power consumption is limited as follows: