Chillers for IT cooling

Article number: SK 3232.731

Especially for cooling IT applications, such as LCP or air/water heat exchangers. Safety-relevant features such as redundant speed-controlled pumps, two compressors or buffer stores.

Article number:
SK 3232.731
Benefits
Indirect free cooling – internal and external
High-efficiency pumps in the cold water circuit
Inverter-controlled pumps
Two high-performance compressors
Up to 8 chillers may be linked together to form a cascade
Technical specifications
Compact design with control components in the front and air intake via both side panels, air outlet upwards
Pressure-sealed system
Integral bypass
Applications
Especially for cooling IT applications, such as LCP or CRAC
Colour
RAL 7035
Supply includes
Chiller wired ready for connection
Multilingual documentation
Functional diagram and wiring plans
Options
Free cooling may be integrated from 15 kW. Please follow the instructions
Buffer store for separate siting
Emergency cooling with mains water infeed
Rated operating voltage
400 V, 3~, 50 Hz
Rated current max.
At 50 Hz: 46.5 A
Tank
Material: Steel tank, with 10 mm condensate insulation
Volume: 100 l
Cooling output (footnote)
Cooling output makes allowance for 35% glycol
Cooling output TW15 TU35/50 Hz
48 kW
Pump pressure
2.5 bar
Pump capacity (at 2.5 bar/50 Hz)
120 l/min
Water connections
G 1½" internal thread
Operating weight
810 kg
Number of cooling circuits
1
Monitoring
Monitoring of all system-relevant parameters such as: water inlet, refrigerant and pump parameters and alarms, as well as optional cooling outputs and energy efficiency
Direct connection of the unit via SNMP/Modbus over Ethernet.
Integration into RiZone
Note
Technical deviations in terms of cooling output, dimensions or weight are possible for unit types with free cooling
The performance data for the chosen option package varies and should be taken from the IT chiller configurator. We reserve the right to make technical modifications
Pump and tank may be selected as options with IT chillers, the relevant technical specifications apply to these configuration variants
Air throughput (unimpeded air flow)
At 50 Hz: 18,000 m³/h
Dimensions
Width: 1,000 mm
Height: 1,780 mm
Depth: 2,300 mm
Operating temperature range of cooling medium
5 °C...15 °C
Operating temperature range
-20 °C...43 °C
Permissible operating pressure (p. max.)
28 bar
Power consumption Pel
At 50 Hz: 21 kW
Packs of
1 pc(s).
Weight/pack
710 kg
Customs tariff number
84186900
EAN
4028177687226
ETIM 7.0
EC002516
ECLASS 8.0
27180713
Product description
SK Chillers for IT cooling, 48 kW, 400 V, 3~, 50 Hz, WHD: 1000x1780x2300 mm
Declarations
Declaration of conformity
Data sheets
Technical system catalogue
Cold water generation
Chiller in compact design
for recooling of circulation water, factory assembled,
internally wired, provided with oil and refrigerant,
pressure-tested.
Highly robust design thanks to redundant components.
Cooling unit especially designed for requirements in
the IT field in conjunction with Rittal Liquid Cooling
Package (LCP)
Consisting of:
Solid enclosure made of section plates with louvre
plates on both sides as air inlet and transportation
holes in the base/plinth.
Two compressors with suction cooled gas, fully
hermetically sealed compressors mounted on vibration
dampers with crank case heaters as "tandem (50 %
- 50 %).
Evaporator as plate heat exchanger with stainless
steel plates, copper soldered, diffusion tight
insulation and electrical heating element.
High-performance condensor, air-cooled (copper pipe
with aluminium fins), with two speed-controlled axial
fans, air suction at the side, blowing out towards the
top.
One refrigerant circuit of soft copper pipe, silver
soldered, equipped with refrigerant collector, dryer,
inspection glass, liquid magnetic valve and
thermostatic expansion valve with MOP, service valves
and blocking valves on the suction and pressure side
of the compressors. High-pressure pressostats,
Low-pressure pressostats in TÜV tested design.
Control integrated in a compact enclosure made of
spray-finished sheet steel IP54 in RAL 7035 (Rittal or
comparable design).
Enclosure and control unit accessible from the front
and wired to VDE/IEC standard.
Micro-processor controller Carel PC05 electronic board with
digital display and SNMP interface card for monitoring and
controlling the complete unit.
5 floating contacts for collective fault signal,
pumps, cooling circuit, excess temperature and filling
pressure fallen below,
24 V AC control voltage,
red lamp "collective fault signal",
remote control on/off,
cable marking with marking systems,
cable entry in the front panel,
all motors with motor circuit breaker,
electromagnetic consumer with RC circuit,
main switch, red/yellow,
flow monitor for pump and evaporator protection,
sensor in water inlet and water outlet,
antifreeze probe to protect evaporator,
redundant connection of several units (max. 8) via
master/slave control possible.
Interface to the building control system via Rittal
CMC or SNMP interface possible.
Water circuit as pressure-sealed system with steel
tank.
Two highly efficient inverter pumps with "Viton" seal
in redundant design with switching to even
utilisation,
blocking valve in front of and behind the pumps,
non-return valve at the pump outlet,
automatic bypass valve,
expansion tank, safety valve and exhaust fan,
draining device and filling connection for water
internal,
water connections in the rear panel,
water pressure manometer 0 - 10 bar,
water pressure monitoring via pressure transmitter in
the water entry, piping and components completely
isolated.
Fluid: Rittal Rifrost standard SK3301.960 for indoor
use or outdoor SK3301.950 for outdoor use; as an
alternative water according to the German standard in
water quality with an additive of 20% to maximum 35% of
Antifrogen N from Clariant. In general it is also
possible to use other additives after prior arrangement
with and approval of Rittal. An inappropriate fluid
can lead to damages at the gaskets etc.
Enclosure: Industrial enclosure painted in RAL7035
with rubber anti-vibrating mounts, fixed below
the unit.
We recommend outdoor siting with an additional rain roof
as weather protection, special fencing and anchoring
to the ground (not in our delivery part).
Transportation: to lift the chiller a forklift can be
used or passing strong enough belts below the unit.
Documentation:
General description
Data sheet
Hydraulic scheme, Legend
Wiring plan
Controller description
Parameter list
Spare parts list
German and English language
CE Declaration of Conformity
Test protocol
Directive taken into account:
Machinery Directive 2006/42/EC
Low Voltage Directive 2006/95/EC
EMC Directive 2014/30/EC
Pressure Devices Directive 2014/68/EC
Technical specifications:
Cooling output at Tw=15°C, Tu=35° 48 kW Cooling
output at Tw=25°C, Tu=35° 54,3 kW Rated operating
voltage +/-6% 400V / 50Hz / 3~ Control voltage
+/-10%, 24 V AC / 50 Hz Power consumption at Tw=15°C,
Tu=35° 21 kW Rated current max. 46.5 A Start-up
current 110 A Refrigerant, R407C Number of compressors
2 Capacity steps % 0-50-100% Number of axial fans 2
Pump capacity 120 l/min Pump pressure, external 2.5
bar Power consumption pump 1,5 kW Tank capacity 100 l
Temperature range +5°C - +20°C Ambient temperatures -
Operating conditions, -20°C to +43°C Ambient
temperatures - Transport, storage -20°C to +60°C
Dimensions with base/plinth (W x H x D),
1000 x 1780 x 2300 mm Base/plinth height, 100 mm
Water connections (internal thread), 1 1/2" Weight,
710 kg Air throughput of fans 18000 m³/h Sound
pressure level in a 10 m distance 53 dB(A)
Protection (Electric) IP 54 for all electrical
components Material piping Copper, brass and piping
Design: Rittal SK3232.731 or comparable
Options:
Hydraulic system kit I: 1 inverter pump
Hydraulic system kit II: 2 inverter pumps
Hydraulic system kit III: 1 standard pump
Hydraulic system kit IV: 2 standard pumps
High efficiency Free-Cooling kit: Free cooling external,
change-over to free cooling at ambient temperature of 2K
below the water inlet temperature;
3-way-valve and controlling are integrated in the
chiller, ambient sensor delivered loose (in the
electrical cabinet) with 5m cable.
Technical alteration with external free cooling:
Cooling output in compressor operation at Tw=15°C,
Tu=35°C 48 kW, Cooling output free cooler at
Tw=15°C, Tu=10°C 46 kW, max. power consumption in
free cooling operation 4,26 kW, max. current in free
cooling operation 7,8 A, air flow direction (to be
indicated) vertical or horizontal
Buffer store of steel, insulated, for separate siting;
volume 1000 l, Dimensions D x H = 890 x 2026 mm in
accordance with data sheet;
Supplied loose: Safety assembly and pressure
compensating tank.
Emergency cooling kit via mains water infeed: Plate
heat exchanger with magnetic valve (24V AC) NC and
pressure switch (on a floating contact) for
integration into the return pipe (LCP). Installed in a
separate housing
Municipal water conditions:
max. 8°C, min. 2.0 bar - max. 6 bar
Special voltage 460V / 60Hz
UPS kit: power infeed divided into two parts - for
compressor and fan, and for control and pump for UPS
connection, switching over by software. (Attention
Must only be used in conjunction with speed-controlled
pumps!)
RiZone efficiency monitoring kit: consisting of additional
sensors to show the energy efficiency of the chiller,
the datas are available by SNMP