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3.6. Tank heater with thermostatic pump start
The tank heater maintains a minimum temperature in the tank. The pump circulates the cold
water, while the tank heater controls the temperature in the system. We recommend a hydraulic
installation as shown in Figure 3. Any bypass valves must therefore always be installed frost-free.
For the heater to be active, the chiller must not be disconnected from the power supply. Even if
the external release (8.3 External release) is deactivated, the pump remains active.
Figure 3: C6856 thermostatic pump start with overflow valve (recommended installation)
3.7. Overflow valve for standby mode
The optional overflow valve should be installed if it is possible for the flow of the cold water to
reduce sharply or be completely prevented while the unit is running. The internal overflow valve
ensures the minimum volumetric flow through the chiller and therefore prevents the pump from
switching off. Figure 4 shows the position of the internal overflow valve.
Figure 4: C6863 overflow valve for standby mode
3.8. Higher pressure pump
The standard Compact-Line units have a 3 bar pump, which is designed for the nominal
volumetric flow of the respective unit. Optionally the units can also be built with higher pressure
pumps, within the limits of the minimum or maximum volumetric flow (1.2 Technical data). The
pump characteristic curve of the pump(s) used in your unit is enclosed with the unit.
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