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Table of Content RK 2125 A-400V
1. User manual 2 ...................................................................................................................
2. Legal regulations 2 ...........................................................................................................
3. Safety instructions 3 ........................................................................................................
4. Technical information 4 ...................................................................................................
5. Functional principle 5 ......................................................................................................
6. Technical data 6 ................................................................................................................
7. Mounting 7 .........................................................................................................................
8. Mounting Principle 8 ........................................................................................................
9. Electrical connection 9 .....................................................................................................
10. Wiring diagram 10 ..........................................................................................................
11. Taking into operation 11 ...............................................................................................
12. Maintenance & Cleaning 12 ..........................................................................................
13. Maintenance 12 ...............................................................................................................
14. Transport & Storage 13 .................................................................................................
15. Parts supplied 13 ............................................................................................................
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1. User manual
This instruction manual contains information and instructions to enable the user to work safely,
correctly and economically on the unit. Understanding and adhering to the manual can help one:
Avoid any dangers.
●
Reduce repair costs and stoppages.
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Extend and improve the reliability and working life of the unit.
●
PLEASE ENSURE TO USE THE RIGHT VERSION OF THE INSTRUCTION MANUAL SUITABLE FOR
YOUR UNIT.
Conditions of use
The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures in
order to protect temperature sensitive components in an industrial enviorment. To meet the conditions
of use, all the information and instructions in the instruction manual must be adhered to.
General danger
Indicates compulsory safety regulations which are not
covered by a specific pictogram such as one of the following.
High electric voltage
Indicates electric shock danger.
Important safety instruction
Indicates instructions for safe maintenance and operation of
the unit.
Attention
Indicates possible burns from hot components.
Attention
Indicates possible damage to the unit.
Instruction
Indicates possible danger to the environment.
2. Legal regulations
Liability
The information, data and instructions contained in this instruction manual are current at the time of
going to press. We reserve the right to make technical changes to the unit in the course of its
development. Therefore, no claims can be accepted for previously delivered units based on the
information, diagrams or descriptions contained in this manual. No liability can be accepted for
damage and production caused by:
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Disregarding the instruction manual
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Operating error
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Inappropriate work on or with the unit
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The use of non-specified spare parts and accessories
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Unauthorised modifications or changes to the unit by the user or his personnel
●
The supplier is only liable for errors and omissions as outlined in the guarantee conditions contained in
the main contractual agreement. Claims for damages on any grounds are excluded.
3. Safety instructions
Upon delivery the unit is already meeting current technical standards therefore it can be safely taken
into operation. Only trained specialists are allowed to work on the unit. Unauthorised personnel must
be prohibited from working on the unit. Operating personnel must inform their superiors immediately if
any malfunction of the unit becomes apparent.
Please note that before starting to work on or with the unit, a procedure must be carried out inside the
cabinet on which the unit is to be mounted.
Before commencing work inside the cabinet, the control cabinet manufacturer's instruction must be
read with regards to:
Safety instructions.
●
Instructions on taking the cabinet out of operation.
●
Instructions on the prevention of unauthorised cabinet reconnection.
●
The electric equipment meets the valid safety regulations. One can find dangerous voltage (above 50V
AC or above 100V DC)
Behind the control cabinet doors.
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On the power supply in the unit housing.
●
The unit has to be fused according to the type plate and the wiring diagram, and must be protected
externally from overloading and electrical faults via suitable protective devices such as ground fault
protection breakers.
Danger through incorrect work on the unit
The unit can only be installed and maintained by technical competent and
qualified personnel, using only supplied material according to the supplied
instructions.
Danger from electrical voltage
Only specialised personnel are allowed to maintain and clean the unit. The
personnel must ensure that for the duration of the maintenance and cleaning, the
unit is disconnected from the electrical supply.
Attention
Damage to the unit through the use of inappropriate cleaning materials. Please do
not use aggressive cleaning material.
Instruction
Damage to the environment through unauthorised disposal. All spare parts and
associated material must be disposed according to the environmental laws.
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4. Technical information
Air - water heat exchangers are intended as complementary accessories to large industrial equipment
which include a motor-operated fan or blower together with a cooling heat exchanger. These may also
include an electric heater. The fan or blower is intended to recirculate air and allow heat exchange.
The heat exchanger is designed for chilled water or anti-freeze/corrosion inhibitor mixed water from a
separate source.
The cooling function may be controlled by an on-board or remote controller or thermostat, a
thermostatically controlled valve or an electrically controlled valve. Heating function, when installed is
provided by an electrical heating element. The unit seals the cabinet which ensures that the clean air
inside does not come into contact with the ambient air which may well be dirty or polluted. The unit is
fit for purpose within the rated/declared ambient conditions (e.g. dusty and oily air or high air
temperatures between 34°F and 162°F), also indicating the rated allowable ingress and environment.
Water quality
To ensure the maximum lifetime of an air-water heat exchangers, it is important to supply cooling
water in conformity with the VGB Cooling Water Guidelines (VGB-R 455 P). The cooling water used
must be soft enough to avoid scale deposits, but should not be too soft as this would corrode the heat
exchanger. Where the cooling water is cooled for reuse, part of the water has to be changed with fresh
water to prevent the concentration of hardness and salt content which makes the water more
corrosive.
The main impurities and possible methods of eliminating them are given in the table below:
Pollution of the water Method of elimination
Mechanical impurities (dp > 0.079in) Filtration of the water
Excessive hardness
Softening of the water by ion
exchange
Moderate content of mechanical impurities
and hardness formers
Addition of dispersants or stabilisers
Moderate content of chemical impurities Addition of passivators and inhibitors
Biological impurities (bacteria and algae) Addition of biocides
When the water is re-cooled, it is recommended that the water condition is maintained as close as
possible to the following list of hydrological data:
Hydrological data
pH-values 7 - 8.5
Carbonate hardness >3 <8 °dH
Free carbon dioxide 0.4673 - 0.8763 gr/gal
Associated carbon dioxide 0.4673 - 0.8763 gr/gal
Aggressive carbon dioxide 0 gr/gal
Sulphides free gr/gal
Oxygen < 0.5842 gr/gal
Chloride ions < 2.921 gr/gal
Sulphate ions < 14.6 gr/gal
Nitrates and nitrites < 0.5842 gr/gal
COB < 0.4089 gr/gal
Ammonia < 0.2921 gr/gal
Iron < 0.01168 gr/gal
Manganese < 0.01168 gr/gal
Conductivity < 2200 µS/cm
Solid residue from evaporation < 29.21 gr/gal
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Potassium manganate consumption < 1.46 gr/gal
Suspended matter < 0.1753 gr/gal
(part flow cleaning recommended) > 0.1753 < 0.8763 gr/gal
(continuous cleaning) > 0.8763 gr/gal
5. Functional principle
The air inside the control cabinet is moved over a laminar heat exchanger through which a coolant
medium runs, making use of the counter-flow principle. The fan blows the warm air along the
aluminium fins of the heat exchanger; it cools down and is then returned into the cabinet. The heat
exchanger fan runs constantly, providing continuous circulation of the air in the cabinet. This
circulation prevents hot spots within the control cabinet. During this process, the coolant heats up and
is returned to the coolant supply system at an increased temperature.
In order to save operating costs, and in the interests of environmental protection, the water
temperature can be reduced by re-cooling systems or cold water sets so that it can be reused in the
heat exchanger. This process involves the water circulating in a closed circuit.
1. Air intake cabinet side
2. Radial fan cabinet side
3. Heat exchanger
4. Air outlet cabinet side
5. Water in
6. Water out
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