13 © STULZ GmbH – all rights reserved EN/09.2017/G44
cybercool indoor chiller original instructions
3.6 Cooling medium circuit (G, GE)
3.5 Chilled water circuit
The chilled water circuit in the unit is open and will only be closed by the connection to the chilled water ring
main on the site. In the unit there is an evaporator as interface to the refrigeration circuit, a (or optionally 2)
centrifugal pump(s), an expansion tank with safety valve, a flow monitor to control the pump function, an anti-
freeze thermostat to protect the evaporator and the system, two ventilating valves and one drainage valve.
A temperature sensor measures the flow water temperature at the unit outlet, this temperature is decisive for
the chiller control. A pressure gauge installed in the unit indicates the flow pressure.
GE units contain an additional heat exchanger for direct cooling (free cooling) and a 3 way valve (free cooling
valve). The free cooling valve conducts the water flow completely through the heat exchanger during free
cooling and mix mode. In the DX mode the valve conducts the water flow completely through a bypass so that
no water flows through through the free cooling heat exchanger.
Version G
The cooling medium circuit contains a plate condenser as interface to the refrigerant circuit and a valve for
filling and draining.
A 2 way or 3 way valve can be optionally installed to control the cooling water flow.
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