Vaillant geoTHERM Installation Instructions Manual

Also see for geoTHERM SERIES: System Installation Instructions Installation and servicing Instructions for use Operating instructions

Contents

Hydraulics installation26 Installation instructions geoTHERM 0020051574_0455.2 Installing the mixed circuit with buffer tank5.2.1 Description of functions for the heatingmode with mixed circuit and buffer tankThe heating circuits are connected as a separating tank tothe heat pump via a buffer tank and are operated using anexternal heating circuit pump via a heating circuit mixer.By default, this is controlled by a flow temperature setpointcontrol (¬ Ch. 9.4.3) .The VF2 flow temperature sensor sits behind the externalheating circuit pump (underfloor protective circuit).The heat pump responds to a demand for heat from thebuffer tank.5.2.2 Installation instructions> Install the hydraulic components in accordance with thelocal requirements and as shown in the sample hydraulicscheme below.> If you do not use the optional accessory heat pump brinefilling unit for heat pumps (56) (¬ Fig. 5.3) install theindividual hydraulic components accordingly (¬ Fig. 5.9).> Connect a limit thermostat to ensure the underfloorheating function on the heat pump.> Connect the VF2 flow temperature sensor to ensure theintegral energy function.> When starting up the unit, set Hydraulic Scheme No 2 inthe controller.The following only applies when installing the optionalexternal passive cooling:b Caution!Risk of malfunction in cooling mode.The buffer tank must not be in operationduring the cooling mode of the heat pump.> Install a motor-driven 3-way divertervalve in both the flow and return so thatthe buffer tank is avoided in coolingmode.Caution: Schematic only!These examples of hydraulic schemes do not contain all ofthe shut-off and safety instruments that are required forcorrect installation.> Observe the applicable standards and regulations.