Hydronic module (option 116)
This module is equipped with pressure transducers to optimise unit operation at the hydronic level. The hydronic module option reduces the installation time. The unit is factory-equipped with the main hydronic components required for the system: Screen filter, water pump, expansion tank, safety valve and water pressure transducers. The pressure transducers allow the Touch Pilot Junior control to: - Display the available pressure at the unit outlet and the static system pressure - Calculate the instantaneous ﬂow rate, using an algorithm that integrates the unit characteristics - Integrate the system and water pump protection devices (lack of water, water pressure, water ﬂow rate etc.) Several water pump types are available: Primary single or dual low-pressure pump or single or dual high-pressure pump. An automatic pump start-up algorithm protects the heat exchanger and the hydronic module piping against frost down to 0°C(30RQSY) outside temperature, if the water heat exchanger frost protection option is installed. If necessary increased frost protection down to -20°C is possible by adding heaters to the hydronic module piping (see option 42). The hydronic module option is integrated into the unit without increasing its dimensions and saves the space normally used for the water pump.
Typical hydronic circuit diagram
Legend Components of the unit and hydronic module 1 Victaulic screen filter 2 Expansion tank (option) 3 Safety valve 4 Available pressure pump Note: x 1 for a single pump, x 2 for a dual pump 5 Air purge 6 Water drain valve Note: A second valve is located on the heat exchanger leaving piping 7 Pressure sensor Note: Gives pump suction pressure information (see installation manual) 8 Temperature sensor Note: Gives heat exchanger leaving temperature information (see installation manual) 9 Temperature sensor Note: Gives heat exchanger entering temperature information (see installation manual) 10 Pressure sensor Note: Gives unit leaving pressure information (see installation manual) 11 Check valve Note: x 2 for a dual pump, not provided for a single pump 12 Plate heat exchanger 13 Water heat exchanger frost protection heater Installation components 14 Temperature probe well 15 Air vent 16 Flexible connection 17 Shut-off valve 18 Screen filter (obligatory for a unit without hydronic module) 19 Pressure gauge 20 Water flow control valve Note: Not necessary for a hydronic module with a variable-speed pump 21 Charge valve 22 Frost protection bypass valve (when shut-off valves  are closed during winter) Notes: Units without hydronic module are equipped with a flow switch and two temperature sensors (8 and 9). The pressure sensors are installed on connections without Schrader valve. Depressurise and empty the system before any intervention.
Electrical data, units with hydronic modules
The pumps that are factory-installed in these units have motors with efficiency class IE2. The additional electrical data required by regulation 640/2009 is given in the installation, operation and maintenance manual. This regulation concerns the application of directive 2005/32/ EC on the eco-design requirements for electric motors.