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83000902.Ka
3.1
3.1
3.1
3.1
General functional description
General functional description
General functional description
General functional description
Fig. 4
Refrigerant circuit (schematic diagram: example, units with open refrigerant circuit)
The cooling system comprises the four main components: evaporator (12
12
12
12), compressor (13
13
13
13), con-
denser (1
1
1
1) with fan (2
2
2
2) as well as the control or expansion valve (4
4
4
4), which are connected together by
pipes. A pressure switch (14
14
14
14) limits the maximum pressure in the refrigerant circuit. The R134a
(CH
2
FCF
3
) refrigerant is free from chlorine. Its Ozone Depletion Potential (ODP) is 0.
A filter dryer (3
3
3
3) which is integrated into the hermetically sealed refrigerant circuit provides effective
protection against moisture, acid, dirt particles, and foreign bodies. A temperature control with tem-
perature probe (6
6
6
6) ensures that the cooling medium is maintained at a preset set-point temperature.
In the evaporator (12
12
12
12), the liquid refrigerant is converted to a gaseous state. The heat necessary for
this purpose is taken from the cooling medium in the plate heat exchanger, which has the effect of
cooling the cooling medium. The refrigerant is heavily compressed in the compressor (13
13
13
13). As a re-
sult the refrigerant has a higher temperature than the ambient air. This heat is dissipated to the am-
bient air over the surface of the condenser (1
1
1
1), resulting in the refrigerant liquefying again.
The refrigerant is injected into the evaporator (12
12
12
12) using a thermostatic expansion valve (4
4
4
4), as a
result it is expanded and is therefore able to absorb the heat from the cooling medium (water, water-
glycol mixture).
The cooling medium is pumped to the equipment in a closed circuit using a pump (9
9
9
9) and cooling
medium tank (10
10
10
10). The flow switch (11
11
11
11) ensures the evaporator (12
12
12
12) is protected against freezing if
the flow rate is too low. The level switch (5,
5,
5,
5, optional) protects the pump (9
9
9
9) against dry running. The
cooling medium (water or water-glycol mixture) feed temperature is regulated using the temperature
probe (6
6
6
6) in the tank.
P
S
11
3
1
2
5
6
7
8
9
10
4
12
13
14
Summary of Contents for nBoxX 1.5
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