Text for tenders: Cold water generation


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.

Redundant 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.

Two refrigerant circuits 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 PCO³ 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 rear 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 30% 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. Condenser with protection grid. 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  ,,,,,,,,2004/108/EC

Pressure Devices Directive ,,97/23/EC





Technical specifications:

Cooling output at Tw=15°C, Tu=35° 49 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 68 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 2000 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 SK3232.730 or comparable





Options:



Hydraulic system kit I: 1 inverter pump

(instead of 2 inverter pumps)



Hydraulic system kit II: 2 standard pumps (instead of

2 inverter pumps)



Hydraulic system kit III: 1 standard pump (instead of

2 inverter pumps)



High efficiency Free-Cooling kit: Free cooling external,

change-over to free cooling at ambient temperature of 2K

below the water inlet temperature; bigger pump 3,5 bar,

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 48,5 kW, Cooling output free cooler at

Tw=15°C, Tu=10°C 46,7 kW, max. power consumption in

free cooling operation 3,0 kW, max. current in free

cooling operation 8,7 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 = 850 x 1980 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, min. 6.7 m³/h.



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



Manufacturer: Rittal
Type: Cold water generation    3232731
or equivalent


Quantity  Unit         Price Each                 Price Total
   
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