12 Appendixes
EN
34
Rittal Micro Data Center Level E
12
Appendixes
12.1 Cooling the Micro Data Center
High temperatures, hot spots or conducting dust in the
Micro Data Center increase the risk of failure and reduce
the service life of modern electronic components. To
provide an appropriate climate environment for the hard-
ware included in the Micro Data Center, the Micro Data
Center interior must be cooled. Systems in various vari-
ants and power levels are available. The Micro Data
Center is always equipped with a split climate control
unit. The evaporator unit is placed inside the Micro Data
Center; the compressor (provided as indoor or outdoor
version) and the condenser are located outside the Mi-
cro Data Center.
To achieve the optimum performance of the cooling unit,
several requirements must be satisfied:
Leak-tightness of the Micro Data Center
Ensure that all seals are undamaged. If this is not the
case, the associated seals must be replaced on-site
(spare parts list).
Air circulation inside the Micro Data Center
The "cold" and "hot" sides must be separated from each
other.
Condensate discharge in accordance with DIN
3168
The condensate water that can accumulate at the evap-
orator is fed out of the housing through a discharge tube
at the evaporator divider panel (ideal conditions for the
formation of condensate water are high humidity and
low internal temperatures in the
Micro Data Center). A hose with the size 12 x 2 mm
must be connected to this discharge tube so that the
condensate water can flow down without problem. The
siphon installed in the drainage system must be filled
with water so that an ingress of flue gases via the con-
densate discharge is prevented.
The condensate discharge is routed through the cable
ducts of the Micro Data Center by the assembling team.
A trouble-free discharge of the condensate must be pro-
vided by the customer at the installation site.
Function principle of the split units
The evaporator in the interior of the Micro Data Center
consists essentially of a heat exchanger and a fan group
that circulates the air within the Micro Data
Center, i.e. the cooled air is blown out in front of the
482.6 mm (19") level, the hot air is extracted at the back
of the servers. The heat is delivered to the refrigerant in
the direct evaporator.
To maintain the cooling circuit, the external condenser
cools the refrigerant back to a suitable temperature level.
The split construction, i.e. the hermetic separation be-
tween the internal and external circuit, ensures the
smoke-tightness of the cooling unit. The internal and ex-
ternal circuits must be connected with each other using
coolant pipes and control cables introduced into the Mi-
cro Data Center through a fire-proof cable inlet. This
function principle applies to all device configurations.
Air routing in the Micro Data Center
The inlet and outlet openings of the cooling unit must not
be obstructed. To prevent an air short-circuit, open
spaces in the front area of the 482.6 mm (19") level must
be closed with blanking plates.
Conditions at the installation site
For installation sites subject to extreme conditions (ag-
gressive media in the ambient air, high humidity, etc.),
the installation of a cooled Micro Data Center must be
checked beforehand.
Note:
It is important to ensure a uniform air circula-
tion inside the Micro Data Center.
Under no circumstances, may air inlet and
outlet openings in the internal circuit be ob-
structed (clearance > 150 mm) because this
would hinder the air circulation in the enclo-
sure and so prevent the cooling capacity of
the device from being used adequately. The
users of the Micro Data Center must be in-
formed accordingly!
Unoccupied height units in the 482.6 mm
(19") rack must be closed with blanking
plates on the operating side.
Note:
Please observe the operating instructions of
the cooling units.
