Hydronic module (option 116)
The hydronic module option reduces the installation time. The heat pump is factory-equipped with the main hydronic components required for the installation: screen filter, water pump, relief valve, water pressure transducer, flow switch. The Pro-Dialog+ control allows integration of system and water pump protection devices (insufficient water flow rate, water pressure, water flow rate etc.). The pump supplied with the hydronic module is a variable speed pump. With variable speed flow, the system no longer requires the control valve at the unit outlet. However, for applications with two-way valves a bypass system must be kept to guarantee the minimum flow rate. Pro-Dialog+ includes two operating modes: - constant pump speed - constant delta T control. An automatic pump start-up algorithm protects the heat exchanger and the hydronic module piping against frost down to -10°C outside air temperature, as standard. 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 heat pump without increasing its dimensions and saves the space normally used for the water pump.
Legend Components of the unit and hydronic module 1 Victaulic screen filter 2 Pressure sensor Note: Gives pump suction pressure information (see installation manual) 3 Safety valve 4 Water drain valve 5 Shut-off valve 6 Water pump 7 Temperature sensors, BPHE inlet Note: Gives heat exchanger entering temperature information (see installation manual) 8 Pressure gauge Note: Allows measuring of the pump suction pressure, the pump leaving pressure and the heat exchanger leaving pressure 9 Temperature sensor, BPHE outlet Note: Gives heat exchanger leaving temperature information (see installation manual) 10 Automatic air vent 11 Flow switch 12 Plate heat exchanger frost protection heater 13 Plate heat exchanger 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 21 Charge valve 22 Frost protection bypass valve (when shut-off valves  are closed during winter) --- Hydronic module (unit with hydronic module)
Typical hydronic circuit diagram
15 17 14 16 22 14 16 17 20 21 19 11 10 9 5 18 19 1 2
3 5 4
13 5 4
Notes: • Units without hydronic module (standard units) are equipped with a flow switch and two temperature sensors (7 and 9). • For units equipped with hydronic module, the pressure sensor located upstream of the pump to prevent cavitation is installed on a connection without Schraeder valves. Depressurise and drain the system before any intervention.