Hydac RFCS Series User Manual

Installation and maintenance manual
H.I.B Hydac International Page 18 of 36
Version: G/DV
Date: 11.01.2023
6.2.1 Function diagram compressor-cooled system (RFCS):
See Annex (optional)
NOTE
The machine performance of air-cooled cooling units depends on the ambient
temperature and the coolant temperature to a considerable extent. The lower the
ambient temperature, the higher the overall performance of the unit.
NOTE
The machine performance of water-cooled cooling units depends on the external water
temperature. The lower the external water temperature, the higher the overall
performance of the unit.
6.3 Description of operation of water-cooled systems (FWKS)
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 heat absorbed in this process is
dissipated to the external water circuit via the plate-type heat exchanger. A flow switch mounted
in the storage tank protects the circulating pump against running dry.
A flow switch monitors the level and reports not enough coolant.
Optional: The flow sensor monitors the level and automatically fills the cooling system via a 2/2
way valve.
Refrigerating Operation: A motorized control valve arranged in the external water circuit controls
the amount of in- water and thus the required refrigerating capacity in dependence on the
measured coolant temperature via the temperature sensor and the temperature controller.
Optional: A 2/2 way valve mounted in the supply line opens or closes the external water circuit
as required at the end or start of work.
Optional: A pressure switch mounted in the external water circuit will give the message „No
external water“.
6.3.1 Functional diagram of water-cooled system
(FWKS):
See Annex (optional)
NOTE
The machine performance of water-cooled cooling units depends on the water
temperature. The lower the water temperature, the higher the overall performance of
the unit.
6.3.2 Specification of coolant (for mixing water additive) and of external water
(optional)Specification of external water (optional)
 Coolant: contaminant particles <50µm
 External water: contaminant particles <200µm
Visual nature: transparent, pure, free from oils and fats.
Dissoved matter in water
Unit
pH-value considering to SI- Index
7 to 9
Saturation index (SI) (Delta pH-value)
-0,2<0<+0,2
Total hardness
°dH
<6
Conductivity
µS/cm
>200
filterable material mg/l
mg/l
<30
Chloride
mg/l
<100
Free chlorine
mg/l
<0,5

Hydac RFCS Series Specifications

General

Brand	Hydac
Model	RFCS Series
Category	Chiller
Language	English