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6.1 Technical information
The cooling unit (compressor refrigeration system) is
comprised of four main components: the coolant
compressor, the evaporator, the condenser, and the
control or expansion valve, which are connected by
suitable pipework. This circuit is filled with a readily
boiling substance, the refrigerant. Coolant R134a
(CH
FCF
) is chlorine-free. Its ozone destruction
2
3
potential is 0, making it very eco-friendly.
A filter dryer which is integrated into the hermetically
sealed cooling circuit provides effective protection
against moisture, acid, dirt particles, and foreign
bodies within the cooling circuit.
H
PSA
switch
Fan 2
Compressor
External circuit
Internal circuit
Evaporator coil
Fan 1
Fig. 13: Cooling circuit
The compressor takes the gaseous refrigerant from
the evaporator and compresses it to a higher pressu-
re in the condenser.
During this process the temperature of the refrigerant
rises above the ambient temperature and heat can be
dissipated to the environment via the surface of the
condenser. Then the refrigerant is liquefied and, by
means of a thermostatically controlled expansion val-
ve, returned to the evaporator, where it evaporates at
low pressure. The heat required for complete evapo-
ration is drawn from the enclosure interior causing it
to cool down. The cooling cycle is thus completed,
the aforementioned process of the heat transfer starts
afresh.
6.2 Handling instructions
6.2.1 Storage, maintenance, transport
and disposal
As a maintenance-free, hermetically sealed system,
the cooling circuit has been filled in the factory with
the required amount of refrigerant, and tested for
leaks and subjected to a function trial run.
The installed maintenance-free fans are mounted on
ball bearings, protected against moisture and dust,
and fitted with a temperature monitor.
The life expectancy is at least 30,000 operating hours.
The cooling unit is thus largely maintenance free.
We reserve the right to further technical modifications of our products. Version 3.0 / 07.2013
Micro Data Center Level A
Note
the cooling unit must be disconnected. Storage tem-
perature: The cooling units must not be exposed to
temperatures above +70°C.
Transport position: The cooling units must always be
transported upright.
Waste disposal: The closed cooling circuit contains
refrigerant and oil which must be correctly disposed
of for the protection of the environment. Disposal can
be carried out at Rittal.
We reserve the right to make technical modifications.
Technical specifications
air/con
Useful
Condenser
cooling
Voltage supply
Rated current 50 Hz
Filter
Rated current 50 Hz
dryer
Temperature control
Pre-fuse T 50 Hz
Temperature
control
Protection category –
External circuit
Duty cycle
Expansion valve
Refrigerant
Noise level
Ambient temperature min.
Ambient temperature max.
If these limits are exceeded or not met, operation of the
air-conditioning system is no longer guaranteed.
6.2.2 Start-up and settings
The climate control unit has been set up at the factory
for operation at 25°C in the Rittal Micro Data Center
Level A.
Comfort controller control
Fig. 14: Comfort controller control
After electrical connection, the internal fan turns on
and circulates the air inside the Micro Data Center
Level A.
This helps assure even temperature distribution within
the enclosure. The fans and magnetic valve are cont-
rolled by the Comfort controller.
: Prior to any maintenance work, the power to
L 25/L 25, 50 Hz
H2 = Button
°C
H1 = Display terminal
H3 = Button
EN
2,4 kW
2400 W
230 V
5,4 A
19,2 A
Comfort controller
16 A
IP 34
100 %
R134a
< 72 db(A)
+10°C
+35°C
H4 = Button
/set
°F
15
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