Update README.md

Author: budulinek

README.md

@@ -241,6 +241,7 @@ Fortunately, 1) Daikin Altherma allows you to connect an external thermostat and
 **Loxone Config**. You can now connect your `Digital Outputs` (relays) directly to the `HVAC Controller` block:
 
 <img src="pics/loxone7.png" />
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 It is quite simple. I have a `HVAC Controller` block which serves as a heating and cooling source for 7 `Intelligent Room Controllers` (see the "7 Objects Assigned" note at the bottom of the HVAC block). The HVAC block needs to know the outdoor temperature, so I feed the `Temperature_Outside_Stabilized` measured by the heat pump to the HVAC block. Loxone Miniserver act as an external thermostat, I have wired 3 digital outputs (relays) to the wiring terminal of the heat pump, even though I only use two of them. Relay `Ext_Therm_Main_Heating` triggers heating on the main LWT zone (floor heating), relay `Ext_Therm_Add_Cooling` triggers cooling on the additional LWT zone (ceiling cooling panels). I do not use my floor for cooling. Both digital outputs (relays) are connected to the appropriate connections of the HVAC block.
 
 **Application Notes**. I recommend using **<ins>both</ins>** the Arduino controller (Virtual UDP Outputs) and relays on the Loxone Miniserver (Digital Outputs) for controlling the heat pump. Each of them is doing a different thing, the two do not replace but complement each other. The **<ins>controller</ins>** (Virtual UDP Outputs) allows you to remotely change user settings (Quiet Mode, Schedules), turn the DHW on/off, change target temperatures (DHW, LWT), etc. Whenever you use the Virtual UDP Outputs, data are written to the main Daikin controller, wearing its EEPROM! So use sparingly. Loxone Miniserver as **<ins>external thermostat</ins>** (Digital Outputs - Relays) allows you to send heating or cooling requests. No data are written to the Daikin EEPROM, though you do wear out your Loxone relay a bit. Let's compare. The `LWT_Control_OnOff` (Virtual UDP Output) completely shuts down heating (though DHW still works). The valves are shut and the heat pump ignores any heating requests from the internal thermostat (main Daikin controller) or the external thermostat (Loxone relays). On the other side, the `Ext_Therm_Main_Heating` (Digital Output - Relay) only sends a request for heating. When the relay is closed (DO = 1), the heat pump knows there is a demand for heating, the circulation pump is running and the compressor maintains the leaving water temperature at a certain level. When the relay is open (DO = 0), no heat is produced but the heat pump is in a stand-by mode, waiting for a new heating request.