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 and

transportation holes in the base/plinth.

Compressors with suction cooled gas, fully

hermetically sealed compressors mounted on vibration

dampers with crank case heaters.

Evaporator as plate heat exchanger with stainless

steel plates, copper soldered, diffusion tight

insulation, with heating resistor to prevent freezing.

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 with output control,

of soft copper pipe, silver soldered, equipped

with refrigerant collector, dryer,

inspection glass, safety valve, 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,

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,

heating resistor in the tank,

draining device and filling connection for water

internal,

water connections in the left side, from the

electrical panel,

water pressure manometer  0 - 10 bar,

water pressure monitoring via pressure transmitter in

the water entry,

Y water filter with blocking valves in the water

entry, piping and components completely isolated.



Fluid: Rittal Rifrost standard SK3301.960 for indoor

use oder outdoor SK3301.950 for outdoor use; as a

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 RAL9002

with rubber anti-vibrating mounts, shipped loose.

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: the chiller is equipped with eyebolts

on the bottom for lifting it with a crane.



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°,,430 kW

Cooling output at Tw=20°C, Tu=35°,,482 kW

Rated operating voltage +/-6%,,400V / 50Hz / 3~

Control voltage +/-10%,,24 V AC / 50 Hz

Power consumption at Tw=15°C, Tu=35°,,141 kW



Rated current ,,307 A

Start-up current  526,4 A

Refrigerant,,R410A

Number of compressors  5

Capacity steps %

0-18-36-54-77-100%

Number of axial fans   6

Pump capacity,,1200 l/min

Pump pressure, external,,2.5 bar

Power consumption pump,, 8.8 kW

Tank capacity,,1000 l

Temperature range medium,,+5°C - +20°C

Ambient temperatures - Operating conditions,,

-20°C - +43°C

Ambient temperatures - Transport, storage ,,

-20°C - +60°C

Dimensions with base/plinth  (W x H x D),,

2200 x 2450 x 4250 mm

Water connections (internal thread),,DN100 flanged

Transportation weight,,3354 kg

Air throughput of fans ,,104100 m³/h

Sound pressure level  in  a 10 m distance  ,,58,5 dB(A)

Protection category (Electric),,IP 54 for all

electrical components

Material piping   Copper, brass and piping





Design: Rittal SK3232.870 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)



Free-Cooling Kit:  Free cooling integrated inside the

chiller, switching-over to free cooling at an ambient

temperature of 2K below the water inlet temperature;

bigger pump 3,5 bar, 3-way mixer and controlling are

integrated in the chiller, ambient sensor delivered

loose (in the electrical cabinet) with 5m cable.



Technical alteration with integrated free cooling:

Cooling output in compressor operation at Tw=15°C,

Tu=35°C 411 kW, Cooling output free cooler at Tw=15°C,

Tu=2°C 276 kW, max. power consumption in free cooling

operation 19,3 kW, max. current in free cooling

operation 43,6 A, dimensions with base / plinth

(W x H x D) 2200 x 2450 x 4250



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 5 m cable.



Technical alteration with external free cooling:

Cooling output in compressor operation at Tw=15°C,

Tu=35°C 430,4 kW, Cooling output free cooler at Tw=15°C,

Tu=10°C 433,4 kW, max. power consumption in free cooling

operation 36,8 kW, max. current in free cooling

operation 81,6 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   SK 3232870
or equivalent


Quantity  Unit         Price Each                 Price Total
   
_____     ______       ____________               ____________
