ef cooling Ernst H. Furrer AG Operating manual
3-14 Chapter page Issue: 07 / 2015 Cooling unit EVO 45, 0390.013
3.2 Setup and function
3.2.1 Overview
The cooling unit is a ready-to-connect device and essentially consists of the housing, the
components of the refrigerant circuit, cooling air and medium circuit, the control cabinet, and all
control, regulating and monitoring devices that are necessary for automatic operation.
The operating medium to be used is defined in Chap. 13.1Technical data.
3.2.2 Controller
The programmable logic controller (PLC) is responsible for safety, monitoring, control and regulation of the
entire cooling unit (see also Chap. 7 Operation).
3.2.3 Refrigerant circuit
The refrigerant circuit is a closed system in which the refrigerant circulates. In the plate
evaporator the process heat is transferred from the medium circuit to the refrigerant circuit at
low evaporation temperature, with the refrigerant transported through the compressor to the
condenser where it is dissipated to the ambient air at a high condensing temperature or to a
water circuit.
Components of the refrigerant circuit: See Chap. 13 Technical documents
3.2.4 Medium circuit
Medium circuit with tank
Through the installed tank, the medium circuit is designed as a system that is open to the
atmosphere. The generously dimensioned tank increases the constancy of the medium outlet
temperature. The pump conveys the medium out of the tank to the consumer, where it is
heated, and via the evaporator, which it is cooled, back to the tank.
Components of the medium circuit: See Chap. 13 Technical documents
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