|SK 3300.570 Rittal air-circulating climate control system (CRAC) Useful cooling output 30 kW|
Rittal air-circulating climate control system (CRAC)
for operation with coolant R407c
Size 1 (18 kW) to size 4 (54 kW)
One-piece air-circulating climate control enclosure
unit for recirculating air operation for use in Data
Centres and other IT operational environments.
The airflow direction inside the unit is from top to
bottom. The supply air is blown out in the raised
The enclosure is designed with a twin-wall cladding
and rolled frame construction. The steel section is
additionally provided with a coat of lacquer.
The corner connections are welded. All doors are
sealed with all-round foamed-in PU seals. The twin
wall is provided with an internal 30/45 mm thick
acoustic and thermal insulation which is fire-proof
and complies with building material class A1 to DIN
Maintenance is exclusively made from the front via the
The outer lining of the rear and side panels consists
of 1.5 mm dipcoat-primed sheet steel. The visible side
is powder-coated in textured RAL 7035 (light grey).
The outer lining of the operating doors consists of
2 mm dipcoat primed sheet steel. The visible sides
are powder-coated in textured RAL 9005 (black).
The construction design, colour and surface structure
of the enclosure are in line with the Rittal server
racks based on the well proven Rittal TS 8 enclosure.
The inner lining of the enclosure consists of hot-dip
galvanised sheet steel, the zinc layer is at least 275
g/m². The inner linings on doors and rear panel have
a material thickness of 1 mm.
Extracted air connection
Free air suction at the top without any further duct
The base frame is equipped with vibration damping feet
Adjustment range for compensating the height when
connecting to the raised floor approx. 50 mm.
The air filter in the unit suction area is designed as
cassette filter and placed on the cooler.
Filter class is G4 to EN 779. Maximum filtration
efficiency is ensured due to the selected construction
selected. The high filtration efficiency offers a
higher protection of material and persons.
By using cassette filters with a plastic fibre frame
the filter surface is maximised. An all-round seal is
on the filter clean air side.
The filter medium consists of fibre-glass web, folded
in a cone shape (V).
A clean air side integrated support grid for
stabilising the folding is integrated. The maximum
dust storage capacity and minor pressure loss are
achieved by a large efficient filter surface.
The position of the filter ensures good access and a
front filter exchange.
Electrical filter and airflow monitoring via a common
Cooling (direct evaporation DX)
The cooling is by an evaporator that is integrated
into the unit
The chlorine free HFC R407c with low greenhouse
potential is used as a coolant.
Direct evaporator as membrane heat exchanger
consisting of copper pipes with high performance
membranes made from aluminium including manifold made
from copper for partitioning, inserted in a sturdy
frame of 2 mm aluminium.
Tray for collecting condensate, can be removed and
cleaned, made from rustproof anodised aluminium
Internal condensate piping with self-filling siphon
consisting of a 40 mm high temperature resistant
These components can simply be removed and exchanged
The compressor is a low-noise operating scroll
compressor that is cooled with suction gas line and
has a three-phase motor. The cooling circuit includes
a filter dryer and a sight glass with coolant -
moisture indicator and electronic expansion valve in
the liquid line. Service valves are provided in
significant numbers. Connections for coolant disposal
and safety pressostats and safety controls and
instruments in accordance with DIN EN 378 are
The internal pipe work of the cooling circuit of
high-quality, seamless copper pipe is deoiled and
deburred and equipped with a diffusion-tight glued,
closed-cell flexible insulation of the suction gas
The machine part is separate from the air-treatment
part. There is sound and airflow insulation. For this
reason maintenance and control of the cooling circuit
is possible under operation. All installation
components are easily accessible.
Condenser (not included)
Air-cooled high-performance condenser for outside
Self-supporting construction in weather-proof design
for vertical and horizontal air-routing.
Axial fan as compact unit in corrosion-protected
weather-proof design. Single-phase AC motor with
operating condenser and thermal contact. The
infinitely adjustable condenser pressure control is
made at the condenser. The condenser is equipped with
all necessary installation components for the cooling
The cold water tubes and the condensate discharge are
led to the bottom out of the unit.
The fan for the airflow direction inside the unit from
top to bottom is positioned in a fluidic positive
manner in the base frame.
Directly driven, single-sided suction high performance
radial fan in reinforced design, without spiral
casing, with stable pressure-volume flow
characteristic. The fan rating is made on optimum
operating point for highest efficiency.
The fan/motor unit is mounted in a supporting
structure and can slightly be withdrawn forwards for
The rotor has blades of aluminium that are bent
backwards and is statically and dynamically balanced
with a balance quality G 6.3 to DIN ISO 1940.
The fan driving motor works on the external rotor
principle in compliance with VDE 0530, part 1 and is
designed as EC DC motor. The motor is integrated in
the wheel. The arrangement in the airflow ensures an
efficient motor cooling. The shaft is located in the
ball bearing in accordance with DIN 625 with permanent
The service life of the bearing is 20,0000 . 30,000
operating hours. The motor is ISO class "F" and has
protection category IP 44.
The electronic commutation unit which is necessary is
placed directly at the motor within the airflow and is
used for infinitely variable speed control of the DC
In the scope of commissioning a simple setting of the
volume flow is possible. The electronic commutation
unit has a set value input 0 - 10 V for the automatic
control of the volume flow via an external controller
(DDC). Integral EMC filter ensure compliance with EMC
limits to EN 50011-B.
Connection voltage 3 phase/N/PE, 400 V
+-10 %, 50 Hz.
The electrical part is separated from the airflow and
equipped with a acrylic glass security cover. Design
according to the relevant EN or VDE regulations. All
components necessary for operating the cooling unit
are mounted on a mounting plate in a clearly arranged
way. Operation is made from the front. The control
circuit is rated with a low voltage of 24 VDC as PELV
to VDE 0100 part 410.
Operating panel of control for display of operating
and failure messages in the front door of the climate
control unit . Clear arrangement by optimising the
installation components - Fuse free contactor-motor
protection combination . Screw-free terminal strip for
more rational and secure wiring . Potential-free
operating (NO contact), maintenance and failure alarm
(NC contact) . Clearly arranged documentation in CAD-E
plans . Labelling of installation components according
to item numbers in the circuit diagram . Terminal
connection diagrams with indication of all external
Each cooling unit is equipped with an autarkically
working DDC controller.
The integral pcs+ control is optimised for air and
climate control technology.
A semigraphic and backlit LCD display inserted in the
door is used as operating unit. The screen resolution
is 132 x 64 pixels, 8 lines with 22 characters.
The text output is in German and can be switched to
Setting of system parameters or set values is possible
via 2 different password levels. Operation is made via