Text for tenders: Water/water heat exchanger


Water/water heat exchanger



Heat exchanger in compact design

for cooling of circulation water, factory assembled,

internally wired and pressure-tested. Built in

redundancy of components.

Heat exchanger - especially designed for requirements

in the IT field in conjunction with Rittal Liquid

Cooling Package (LCP) consisting of:

Description of enclosure:

Rittal top enclosure system or comparable, with

overlapping doors with compatible width, without

mounting plate, side panel and roof plate, a front

door with cutout for controller, a perforated front

door for ventilation and exhaust.

Spray-finished in RAL 7035,

Rittal base/plinth or comparable consisting of 2

base/plinth elements and 4 covers in RAL 7035, service

side at the front.

Components, sensors:

Plate heat exchanger screw-fastened or soldered,

plate material min. 1.4401.

Flow meter with 4-20 mA output.

Temperature control including digital display and 4

temperature inputs.

Pressure sensor including visual display with 0 - 5V

output.

Filter with bypass and pressure difference monitoring

250µm, easy to clean, dirty water can be drained at

the filter.

2 stainless steel pumps (housing and wheel), that are

always designed for redundancy, linear controlled with

display (LEDs or digital) via  pressure transducer.

Linear controlled 3-way valve.

Material: Grey cast iron, 3-point control with limit

switching.

Safety component assembly consisting of safety valve

6.0 bar, expansion tank with blocking valve, pressure

reducer - adjusted to 2.5 bar.

Control:

Integrated in a compact enclosure made of

spray-finished sheet steel IP 54 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 for monitoring and control of the whole unit.

The position of the 3-way valve can be seen from the

control of 0-100%; in addition there is a

visualisation of all water inlet and outlet

temperatures as well as the flow in the primary

circuit in l/min.

Control voltage 24V AC, ON-OFF switch red / yellow,

remote switch on/off (2 terminals). single-wire and

cable marking with marking systems, electromagnetic

consumer with RC circuit, all motor pumps with  motor

circuit breakers,

without feed line/ without control line, all

electrical components are designed in IP 54,

Control switch of pump "Pump 1 - Automatic - Pump 2".

Description of control, alarm and fault messages:

The controller takes up the temperature in the flow of

the secondary circuit  and controls the 3-way valve in

the primary circuit. Furthermore the temperatures  in

the return secondary circuit and inlet/outlet primary

circuit are measured and displayed. The system

pressure is measured by a pressure transducer in each

flow and can be retrieved via the display. The volume

flows are measured in both circuits via the flowmeters

and can also be displayed. The system pressure should

be 1.0 bar - 1.5 bar in resting state.  A 48 h pump

changeover is made when the second pump starts. The

first one is then switched off.

The system pressure is monitored via the pressure

transmitter at the filter entry.

Alarm "filling pressure too low" when the pressure is

below 0.8 bar.

Fault "filling pressure too low" when the pressure is

below 0.5 bar.

In case of this fault message the pumps are switched

off.

The pump pressure is monitored by the pressure

transducer at the filter entry (secondary). If the

pressure is below 3.5 bar when the pump runs, it will

be switched over to the redundant pump and the running

pump will be switched off with the fault message

"pressure of pump". If the redundant pump does not

reach the pressure as well it will be disconnected

too.,,

The differential pressure of the secondary water

filter is measured via two pressure transducers.

Alarm "water filter dirty" when the differential

pressure exceeds 1.2 bar.

Fault "water filter dirty" when the differential

pressure exceeds 1.5 bar.

The monitoring can be switched off at the operating

unit.

The inlet pressure is monitored  by the pressure

transducer at the filter outlet (secondary).

Alarm "pressure too low" when the pressure is below

1.5 bar.

Fault "pressure too low" when the pressure is below

1.0 bar.

The monitoring can be switched off at the operating

unit.,,

The return line pressure is monitored by the pressure

transducer in the return (secondary).

Alarm "pressure too low" when the pressure is below

1.0 bar.

Fault  "pressure too low" when the pressure is below

0.5 bar.

The monitoring can be switched off at the operating

unit.

The temperature is measured by the temperature sensor

in the secondary flow.

Alarm "temperature too high" when the temperature is

over 22°C.

Fault "temperature too high" when the temperature is

over 27°C.

The monitoring can be switched off at the operating

unit.

The differential pressure of the primary water filter

is measured via two pressure transducers.

Alarm "water filter dirty" at a differential pressure

exceeding 1.2 bar.

Fault "water filter dirty" at a differential pressure

exceeding 1.5 bar.

The monitoring can be switched off at the operating

unit.

The flow is measured via a stainless steel flowmeter

(Krone brand or comparable) in the primary circuit.

Alarm "flow too low" at a flow below 80%.

Fault "flow too low" at a flow below 70%.

The monitoring can be switched off at the operating

unit.

The inlet pressure of the cooling water is monitored

by the pressure transducer at the filter inlet

(primary).

Alarm "pressure too low" when the pressure is below

1.5 bar.

Fault  "pressure too low" when the pressure is below

1.0 bar.

The monitoring can be switched off at the operating

unit.

The cooling temperature is measured by the temperature

sensor in the primary inlet.

Alarm "temperature too high" when the temperature

exceeds 10°C.

Fault "temperature too high" when the temperature

exceeds 14°C.

The monitoring can be switched off at the operating

unit.

The pump motors are controlled by a motor

circuit-breaker.

By activating the faults "Motor circuit-breaker  pump

1" and/or "Motor circuit-breaker pump 2" are

displayed.

All alarm and fault messages are displayed on the

operating unit and must be acknowledged with the "ESC"

key.

The last ten faults and messages are stored with date

and time and can be read on the display.

The alarm messages are put on floating contacts.

The fault messages are put on floating contacts.

Documentation:

All documents as ACROBAT files (pdf format),

consisting of:

Documentation in German and English,  general

description,  operating manual , maintenance manual,

data sheets ( main components), hydraulic scheme,

legend, wiring plan, description of components,

parameter list,

spare parts list,

dimension diagram,  cooling enclosure (dimensions,

connections, position of installed components),

test protocol.

General directives:

Machinery Directive 98/37/EC

Low Voltage Directive 2006/95/EC

EMC Directive 2004/108/EC

Pressure Devices Directive 97/23 CE

IEC 72/ 654/ 204-1 (construction)

NFE04-202/-203 (graphic design etc.)

RoHS conform



Technical specifications:

Rated voltage +/-10%,,400V / 50Hz / 3~ +/- 10%

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

Rated current ,,3.5 A

Start-up current (limited to 1.5 x I rated) 5.3 A

Power consumption ,,2 x 1.77 kW

Rated cooling output at 6 °C / 15 °C

Primary side / secondary side,,25 kW

Rated cooling output at  8 °C / 15 °C

Primary side / secondary side,,22 kW

Rated cooling output at 10 °C / 15 °C

Primary side / secondary side,,18 kW

Rated cooling output at 12 °C / 15 °C

Primary side/ secondary side,,10 kW

Primary water conditions,,Atmospherically sealed

system  (no air supply), max. 40% glycol,  drinking

 water quality

Primary pressure  Primary side,,Min. 1.5 bar, max. 6

bar, min. 1.5 bar, max. 6 bar

Primary water amount,,62 l/min

Admissible temperature range

Primary/secondary side,,+6 °C to + 30 °C

Maximum operating pressure,,6 bar at 30 °C (primary

side / secondary side)

Test pressure,,10 bar at 20°C

Operating side / maintenance side,,from the front /

front side

Rated- pump output volume ,,62 l/min

Delivery pressure external,,2.5 bar (secondary side)

Rated output Pump,,2 x 1.1 kW

Power consumption  pump,,2 x 1.77 kW

Height above sea level,,max. 1000 m

Sound pressure level,,70 dB(A) max. DIN 45635 Part at

1 m

Ambient temperatures - Transport,,>0°C - +60°C

Ambient temperatures - Operation,,+5°C - +45°C,5- 96%

relative humidity

Water connections secondary side,,Internal thread

RP 1"

Water connection primary side,,Internal thread

RP 1",,,,

Water connection filling,,1/2" connector sleeve and

sealing cap

Weight,,approx.  400 kg

Dimensions enclosure (TS 8),

with base/plinth (W x H x D),,1200 x 1900  x 800 mm

Base/plinth height,,100 mm

Protection category (electrics),,IP 54 for all

electrical components

Material of pipework,,Copper soldered or pressed

Vibration and acceleration load,,2-13.3Hz, amplitude

+/-1mm13.2- 100Hz, acceleration +/- 0.7g2-13.3Hz





Design: Rittal SK3232.900 or comparable





Options:

Standard pump with automatic bypass instead of speed

control



Emergency water infeed via additional, internal heat

exchanger, by means of spring-loaded 2-way magnetic

valve, non-return valve as backflow preventer and

pressure transducer as monitoring.



Secondary flow monitor with  4-20 mA signal



Special voltage / special frequency, 460V / 60Hz / 3~



Buffer store 1000 - 3000 l



Ethernet interface card

Via this pCO³ Web card it is possible to communicate

directly or via  Gateway (Ethernet, BACnet, SNMP

V1,2,3, -IP-, FTP- and HTTP- protocol) with the most

common communication standards.

Connection with an Ethernet network:

The pCOWeb card is used,  to connect the pCO-Regler

with a 10Mbps Ethernet network permanently in

following functions:

·,,Access to pCO information (network variables and

parameters) via an Internet Browser, as Internet

Explorer,  installed on a PC and connected to  pCOWeb

via TCP/IP.

·,,Connection to a an subordinate network that

processes one of the following standard protocols :

-SNMPv1 &v2c; -BACnet Ethernet ISO8802-2/8802-3;

-BACnet/IP (Addenda A/Annex J)



Pipework in stainless steel 1.4401



Tubular frame without TS 8 enclosure



Manufacturer: Rittal
Type: Water/water heat exchanger   SK 3232900
or equivalent


Quantity  Unit         Price Each                 Price Total
   
_____     ______       ____________               ____________
