Initial Setup

Once MiniHPC is connected to the outdoor unit and all desired peripherals (circulation pump, electric heaters, 3-way valves), it is ready for immediate operation. Simply select heating or cooling mode on the main screen.

However, it is recommended to perform several steps and configurations before the first start-up.

Controlling MiniHPC

MiniHPC is controlled and configured via a color touch screen. At the top of the screen is the status bar (1), which can display up to 4 selected data points configurable in the menu Screen. On the right side of the status bar, the current time and a Wi-Fi icon are displayed. If the Wi-Fi icon is white, MiniHPC is connected to the home network. If it flashes blue, MiniHPC is in AP mode, allowing connection from a mobile phone for configuration of the home network (explained later).

The top-left section below the status bar (2) shows the T3 and T2 temperatures, representing the output of heated water from the heat exchanger and the input of cold water to the heat exchanger. A temperature of -40°C indicates that the temperature sensor is not connected.

The bottom part of the screen contains control elements (3). The left button opens device settings, while the right button is a shortcut to DHW settings. The center button toggles heating or cooling (excluding active DHW heating). The buttons with the snowflake and sun icons activate cooling and heating, respectively.

When DHW heating is activated in the menu 3.1 DHW temperatures, an icon appears in the upper right corner below the clock, indicating active DHW heating (4), with the set and current T5 temperature in the tank. Clicking this icon forces DHW heating to the set temperature, regardless of the current temperature. During active DHW heating, the set temperature blinks orange if heated by the air conditioner and red if heated by an electric coil.

The middle part of the screen shows the set temperature according to the selected temperature control method (5). The icon above the temperature indicates which temperature (T1, T2, or T3) is displayed, either in fixed temperature mode or weather-compensated mode. The plus and minus buttons allow for direct adjustment of this temperature from the main screen without entering the settings menu.

Above the control buttons at the bottom of the screen is the status bar (6) showing the current state of relay outputs R1 – R5 and inputs S1 and S2. When active, the color changes to white. If these outputs are manually switched in the menu Service, the color will be red for manual off and green for manual on.

Connecting to Wi-Fi

It is recommended to connect MiniHPC to a Wi-Fi network and enable internet access (this is not required for operation). This simplifies time configuration and firmware updates.

If the blue Wi-Fi icon flashes next to the clock, the device is in AP mode, and you can connect to it via a mobile phone. (If AP mode is not active, it can be enabled in the menu 9.2 WiFi AP).

On your mobile phone, connect to the Wi-Fi network with the SSID miniHPC. This network has no password. Most phones will automatically open a web page where you can scan for available Wi-Fi networks and connect to a selected 2.4 GHz network. After a successful connection, the Wi-Fi icon will change from blue/black flashing to blue/white. You can then disable Wi-Fi AP mode in the menu 9.2 WiFi AP, although it will automatically disable after one hour. Once disabled, the Wi-Fi icon will remain white, indicating a successful connection to the local network.

If the phone does not automatically open the Wi-Fi configuration page (common on Samsung phones), open the browser and go to 192.168.4.1. If this also fails, disable mobile data on your phone, as some phones may attempt to access this address via the internet instead of the MiniHPC Wi-Fi network.

Setting the Time and Firmware Upgrade

After connecting MiniHPC to the internet, go to the menu Date / time. The current date and time will be fetched from the NTP server (the device will freeze for a few seconds). Adjust the hour for your time zone, as the time is set to UTC+0. If MiniHPC is not connected to the internet, set the date and time manually. MiniHPC does not automatically adjust for daylight saving time, so this must be done manually.

You can then check for and download the latest firmware in the menu 14.1 Firmware upgrade.

Operating Parameters

Now, you can proceed to configure parameters for heating, cooling, DHW heating, and other settings.

• In the menu 1.1 Turn on/off heating by, select the method for activating the heating system.
• On the next page in menu 1.2 Control temperature by, choose whether you want to control the temperature based on the room temperature (T1) or the water temperature (T2/T3), either with a fixed temperature or weather-compensated control.
• If an electric heater for heating is connected to relay R2, you can activate and configure it in the menu 1.5 Electric heater R2.
• Similarly, set the parameters for cooling in the menu 2.1 Turn on/off cooling by and 2.2 Control temperature by.
• If you want to use a Bluetooth sensor to measure temperature and humidity instead of the T1 NTC sensor, and calculate the dew point for cooling, activate these options in the menu 2.6 Dew point / BT sensor.
• Activate DHW heating in the menu 3.1 DHW temperatures, where you can set the desired DHW temperature and hysteresis (temperature differential).
• The anti-legionella function is enabled by default. It heats the DHW to 65°C every Saturday at 2:00 a.m. These parameters can be adjusted in the menu 3.3 Anti-legionella.
• In the menu 3.6 El. heater mode, select the option for DHW supplementary heating. By default, the electric coil connected to R1 is used, but you can also choose heating through R2 (along with switching the 3-way valve R4 and activating the pump R3).
• It is advisable to calibrate the NTC sensors in the Calibration menu. At a minimum, calibrate the T2, T3, and T4 sensors (if connected). The goal is to ensure all sensors display the same temperature when the heating is off. The difference in temperatures is used to calculate heating performance and COP. More details on the calibration process can be found in the menu 7.1/7.2 NTC calibration.
• In other sections of the calibration menu 7.3 Flow sensor I1, set the pulse count per liter for the flow sensor you are using. In menu 7.4 input power, select the input and value for the external watt meter (if connected).
• In the Protection menu, choose the type of flow protection in sections 8.1 Flow protection, 8.4 Overload protection. If external unit heating is connected, configure the desired parameters in the menu 8.5 ODU heating cable.

You can now activate heating (sun icon) or cooling (snowflake icon) from the main menu at the bottom of the screen.