Installation and maintenance manual
H.I.B Hydac International Page 17 of 36
Version: G/DV
Date: 11.01.2023
5.3.7 The device’s emission of airborne noise (see technical data sheet)
As the work area or work areas are not specified or cannot be specified, the measurements of
the A-weighted sound pressure value are taken at a distance of 1m from the device surface and
1.60m above the ground. The highest emission sound pressure value is given (see technical data
sheet).
6.0 General description of the unit
6.1 Usage to the intended purpose
The unit serves for cooling the coolant required for the working or finishing process.
The unit is designed as stand-alone or integrated device, depending on the configuration
concerned. For better understanding of the system, use the flow chart in the appendix.
Unauthorized modifications of and changes to the unit as well as using the chiller
for any other purpose are forbidden for safety reasons.
6.2 Description of operation of compressor-cooled (RFCS)
The coolant is supplied to the consumer and back by the circulating pump. The flow controller
(optional) mounted in the coolant-circuit monitors the flow. The absorbed heat is dissipated via
the refrigeration-circuit to the ambient air or an external water circuit. A low-level float switch
mounted in the storage tank protects the circulating pump against running dry.
A flow sensor monitors the level and reports not enough coolant.
Option: Another level sensor monitors the level and automatically fills the cooling system via a
2/2 way valve.
Refrigerating Operation: Absorbed heat is dissipated to the refrigerant gas by the evaporator.
Any refrigerant that evaporates during this process is drawn in and compressed by the
compressor. The compressed refrigerant (hot gas) is then cooled and liquefied in the condenser.
Depending on the refrigerating system, the heat released during this process is dissipated to the
ambient air or an external cooling system. Liquefied refrigerant is again injected into the
evaporator via the expansion valve and absorbs heat during this process. A high-pressure relief
valve integrated in the system protects the cooling system against excess pressure.
Optional: Hot gas bypass operation
A 2/2 way valve mounted in the refrigeration circuit controls the required cooling capacity as a
function of the measured coolant-temperature via the temperature sensor and the temperature
controller.
Optional: Flow control
A motorized control valve mounted in the cooling circuit controls the required cooling capacity as
a function of the measured coolant temperature via the temperature sensor and the temperature
controller.
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General