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 with electrical heating element.

High-performance condensor, air-cooled (copper pipe

with aluminium fins), with two speed-controlled axial

fans, air inlet from both sides, blowing out towards

the top.

Two refrigerant circuits of soft copper pipe, silver

soldered, equipped with refrigerant collector, dryer,

inspection glass, security 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 TV 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 PCO electronic

thermostat 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=15C,

Tu=35C ,,15 kW Cooling output at Tw=20C, Tu=35C

16,5 kW Rated operating voltage +/-6% 400V / 50Hz / 3~

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

consumption at Tw=15C, Tu=35 6.9 kW Rated current

max.,,23 A Start-up current  34 A Refrigerant R407C

Number of compressors 2 Capacity steps % 0-50-100%

Number of axial fans 2 Pump capacity,,60 l/min Pump

pressure, external  2.5 bar Power consumption pump

0,9 kW Tank capacity,,48 l Temperature range +5C - +20

Ambient temperatures - Operating conditions -20C -

+43C Ambient temperatures - Transport, storage ,,

-20C - +60C Dimensions with base/plinth (W x H x D),,

810 x 1542 x 1560 mm Base/plinth height,,100 mm

Water connections (internal thread),,1" Weight 375 kg

Air throughput of fans ,,10880 m/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 SK3232.700 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 5 m cable.



Technical alteration with external free cooling:

Cooling output in compressor operation at Tw=15C,

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

Tu=10C 15 kW, max. power consumption in free cooling

operation 1,6 kW, max. current in free cooling

operation 5,4 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. 8C, min. 2.0 bar - max. 6 bar, min. 6,7 m/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 3232700
or equivalent


Quantity  Unit         Price Each                 Price Total
   
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