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2 This leaflet is subjet to alteration without notice - 2 -

3 What is the HYDROVAR? HYDROVAR is the world s first pump mounted, microprocessor based pumping system controller. Designed by VOGEL Pumps Austria, the HYDROVAR does much more than just change motor speed. It truly manages the pump performance to match a wide range of system conditions and requirements. By combining the HYDROVAR with our popular SSV, FCE, MPB, LM, LMR and LFZ series pumps, we have created an extremely versatile range of pumps for use in HVAC, water supply, irrigation, filtration, pressure wash, boiler feed, circulation, and a wide range of OEM applications. What is this different? The typical construction of a pressure set or constant pressure system includes one or more pumps assembled together with common suction and discharge headers which are then connected to a large pressure accumulator, this package set is then connected to the system. As the system demand increases the pumps are switched on by some form of pressure sensor that operates through a control panel. On systems which require alternating duty sequencing a microprocessor is required and on some systems bypass lines are maintained by the use of metering valves. The use of some of these variable speed drives also requires the use of special motor/controller combinations. The HYDROVAR changes everything. Ü The HYDROVAR does away with all of these

4 The idea... all components contained within one unit! BLOCKPUMPS FREQUENCY INVERTER totally enclosed IP 54 / IP 55 PRESSURE TRANSMITTER or DIFFERENTIAL PRESSURE TRANSMITTER Control by MICROPROCESSOR incl. automatic change over This leaflet is subjet to alteration without notice - 4 -

5 Motor power up to 22.0 kw approved as per EN / EN from 1.1 kw. from 11 kw to 22.2 kw - 5 -

6 Highlights... at a glance Fitting of oversized motor allows increased output in overspeed range. Pump duty adjusts automatically to meet demand i.e. follows the system curve. Immediate shut down of pump at zero consumption. Energy saving up to 70% at partial load. pump with constant speed pump (variable speed) Example: Circulation pump with nominal power of 11 kw at partial load capacity in % power consumption as per curve pump at constant speed pump at variable speed following system curve saving in kw saving per 1/3 year (2920 hours) 25 % 50 % 75 % 5.8 kw 7.6 kw 9.2 kw 1.8 kw 3.2 kw 5.7 kw 4.0 kw 4.4 kw 3.5 kw 11,680 kwh 12,848 kwh 10,220 kwh Energy saving within 1 year (8.760 hours) 34,748 kwh Compared with the investment of Hydrovar control unit, the pay back period is less than one year (depending on energy cost). This leaflet is subjet to alteration without notice - 6 -

7 Highlights... at a glance Simple Installation! 1) mechanical installation 2) electrical connection 3) setting of desired parameters Rigid Aluminium housing totally enclosed IP 54 / 55 Saving of investment costs by eliminnation of control panel Sufficient cooling of inverter by motor fan No need for external pressure or differential pressure sensing No need for flow metering because of indirect flow sensing Simple design of multiple pump units (max. 4 pumps) by integral processor and interface connection (RS 485) which allows automatic switch over in case of pumps being out of sequence, cyclic change of lead and lag pumps, automatic start and stop of lag pumps following the system demand, provision for connection into central control system. BMS - 7 -

8 Engineering Control: The built-in frequency inverter and microprocessor provides pump control based on pressure, differential pressure, or flow. The patented VOGEL pressure control version stops the pump immediatly at zero consumption. The discharge of the pump is being calculated via the speed indirectly and may be programmed to compensate for varying friction losses following a programmable system curve. The Hydrovar variable speed pump may additionally be controlled externally with the required speed fed in by an external control system. To prevent unauthorized personnel from changing operating data, a password may be set up. The starting and stopping of the pump as well as the setting of control parameters is done at the keyboard and shown at the LCD display at the drivehead (in HV 1.x, no display). The display is two lined and programmed for seven languages. There are also three diodes to indicate pump ready, pump running and fault. An analogue signal to monitor speed or pressure is provided. Communication with a central control system is also possible via an RS 485 interface. Each HYDROVAR drivehead contains an individual microprocessor which controls the automatic operation of lead and lag pumps according to demand. Cyclic change over of lead and lag pumps, automatic start and start of the next pump to come in case a pump gets out of order. No external controls are necessary. The voltage controlled frequency inverter supplies a sinus variated pulse width modulated output voltage. It works with controlled sinusoidal current synthesis and a dynamic overcurrent limitation. The high swichting frequency (selcted between 2,5 and 80 khz) prevents undesired noise from driving motors. Reactions to the feeder are prevented by a filter. Inverter cooling is enhanced by the motor fan. There is also a memory for inverter fault signals an operating hour counter and an automatic cyclic start up of the pump as a test run. This leaflet is subjet to alteration without notice - 8 -

9 Primary Applications Any process requiring various hydraulic data Applications for the HYDROVAR systems are similar to those for the pumps they are used on. The deciding factor is a variable demand for either pressure, or flow, or both. These conditions are normally found in applications in volving water supply and circulation. Market Application s Municipal Pressure booster stations Water works supply Building Trades Pressure boosters Irrigation systems for high rise buildings HVAC Boiler feed Heat exchangers Chillers Induction heating Air filtration Water circulation Fans (wall mounted version) Water Purification Reverse Osmosis systems Filter Feed Production of deionised and ultra pure water Agricultural / Recreational Irrigation systems Water supply and transfer OEM Variable flow and pressure wash systems Fluid circulation with variable demand Packaged booster systems Fountains Waste Water & Sewage Treatment - Sewage pumps & Mixers (wall mounted version) - Cleaning systems Industrial Applications Formulation Systems Spray Wash Systems Seal Barrier Fluid Systems Cooling Tower Systems - 9 -

10 Primary Applications WATER SUPPLY Fully automatically operating speed controlled booster units comprising max. 4 pumps for building services. WATER SUPPLY Fully automatic speed controlled booster pumps to compensate for high friction losses during peak consumption periods. Overhead tank HEATING, VENTILATION, AND AIR CONDITION Circulators up to 340 m 3 /h operating at variable speed to follow system curvers (for single or twin pumps). WATER TREATMENT AND PROCESSING PLANTS Automatically controlled pumps for constant flow at variable pressure. Q = constant This leaflet is subjet to alteration without notice

11 Product Overview What is the typical HYDROVAR system? With the HYDROVAR, one or more pumps are connected to common headers as in a standard system, but that is where the similarity ends. No special pumps or motors: The HYDROVAR will be mounted directly onto standard 230/400 volt, three phase TEFC motors with class F isolation up to 22 kw. Preselected combinations are available with the SSV, SHS and FCE series range of pumps and the Vogel MPB, LM, LMR and LMZ rage of pumps. No separate pressure sensors: The HYDROVAR systems comes with your choice of pressure transducer for various maximum readings or an orifice plate with a differential transducer for constant flow settings. They are mounted to eliminate the need for special piping. No separate microprocessor systems: In a multi-pump system a microprocessor is used to sequence the pumps or control the VFD on pump motors. Because the HYDROVAR is a Microprocessor system, no other controllers are needed. No separate control panels and inverters: A control panel has protections such as overload, overtemperature, short circuit (and others) built-in. It also acts as the interpreter between the pumps and the pressure sensor and may have an inverter to change motor speed. As a system the HYDROVAR acts as the control panel on the pump. An isolated fused main supply is the only external device required. No bypass lines and metering valves: Most standard control systems are designed to control motors and do not offer much in the way of hydraulic protection. Protection from dead heading and running off the end of the curve must be provided in the piping. With the HYDROVAR, the pump will shut down at zero demand, or low suction, or maximum flow. No large pressure accumulators: Without a supply tank, a constant speed pump will be constantly turning on and off and running up and down the curve at maximum power to satisfy system demands. In the HYDROVAR system, each pump changes is operating speed from zero to 3000 rpm to constantly maintain constant pressure or flow and therefore eliminates the need for a large pressure accumulator. A small pressure tank is required to maintain system pressure at zero demand, however this is about 10% than required for a constant speed system. Where local regulations permit, HYDROVAR pump sets can be connected directly onto the water supply line therefore also eliminating the need for large break tanks on the suction side. In addition, the operation of the pump at the correct speed for the required duty leads to a significant reduction in energy consumption. Anti-condensation Heater All units are supplied with anti-condensation heaters to switch on when the units are in standby mode

12 Product Overview What are the various configurations? The HYDROVAR control is currently available with the SSV, FCE, MPB, LM, LMR and LMZ pumps up to 22 kw. Each of these configurations was specifically selected to provide optimum performance and energy savings on a wide range of systems needs 30, 37 and 45 kw only for wall mounting. Each system comes with a standard three phase TEFC motor selection. Note: A 3 phase TEFC motor must always be used with the HYDROVAR controller. The motor connects to the HYDROVAR and the HYDROVAR connects to the power supply. For 2,2 kw and below, the HYDROVAR input requirement is single phase 230 volt. For 2,1 kw and above the HYDROVAR input requirement is three phase 400 volt. Att. Both options available for 2,2 kw and 2,1 kw. The HYDROVAR controller comes with a pressure transducer, transducer connection cable and transducer mounting hardware as standard. The standard pressure transducer is stainless steel Aisi 316 with a viton gasket and is designed for pressure up to 10 bar. For higher pressure applications a 25 bar transducer is supplied. If constant flow is selected an orifice plate with a differential pressure transducer is available. The measured differential pressure is converted to flow and used to adjust the pump running speed. The HYDROVAR can work with any sensor (i.e. level, velocity, temperature, chem. concentration, flow...) emitting a 4-20 ma signal. This leaflet is subjet to alteration without notice

13 Product Overview Motor mounted HYDROVAR units kw 5,5 11,0 kw 1,5 4,0 kw HV The control-design is similar to the standard HYDROVAR but smaller and cheaper! These units are available for 1,1, 1,5 and 2,2 kw motors. Standard controls for the unit are two push buttons and one LED indicator. A separate programming module is available and necessary to programm the unit, but not necessary during operation. Sequence-control for max. 4 pumps is possible also with the HV For further information, please see the separate leaflet!

14 Product Overview HYDROVAR for mounting on the wall HYDROVAR-wall mounting version kw ,0 kw kw kw Applications: 1. HYDROVAR wall mounting version with clearwater submersible pump This HYDROVAR design variant allows the device to be used to control submersible pumps for drinking water and sewage. The length of the shielded cable to the motor should not exceed 20 m. For cable lengths up to 100 m, an additional electrical device is necessary, which is optionally available, the maximum speed must also be reduced. All control functions are identical to those of a normal HYDROVAR control device. This leaflet is subjet to alteration without notice

15 Product Overview 2. Many pumps in process must have explosion proof drives. That s why HYDROVAR units are available in a wall-mounting version op to 22 kw and in a split version up to 45 kw. These units can be combined with explosion-proved motors but they are mounted outside of the explosion area and not on the motor. Explosion area Non explosion area Wall-mounting version Explosion proved motor 1,5-22 kw kw 3. HYDROVAR wall mounting units for sewage submersible pump Saving cost for building, saving energy Switchboard HYDROVAR inverter l Leveltransmitter n max l cost saving by reduction of reservoir volume saving pump energy up to 50 %

16 Product Overview What does the HYDROVAR do? The basic function of the HYDROVAR is to control the pump to meet your system demands in one of three ways. Control for constant pressure Control to match a system curve Control for constant flow Actuator mode It performs these functions by: 1) Measuring the system pressure or flow via a transducer mounted on the pump discharge or pipe. 2) Calculating the motor speed to maintain the correct flow or pressure. 3) Sending out a signal to the pump motor for start, increase speed, decrease speed or stop. 4) In the case of multiple pump installations the HYDROVAR will vary the order of the lead pump and turn on the lag pumps automatically of duty/assist sets. In addition to the basic functions, the HYDROVAR can do things only the most advanced computerised control systems can do, such as: l Shut off the pump(s) at zero demand immediately. l Shut off the pumps at zero suction. l Shut off a single pump when exceeding maximum flow or automatically turn on the next pump in a multiple series. l Protect the pump and motor from over voltage, under voltage, overload and overhead. l Vary the time of pump speed acceleration and deceleration. l Automatic compensation of higher friction losses at high flow rates. l Send out a signal for remote monitoring of pressure and frequency. l Conduct an automatic test run of the pump at set times. l Display all functions in an LCD window in 7 different languages. (English, German, Spanish, Portugese, French, Italian, Dutch) l Can communicate with another HYDROVAR, computer, or other controller via an RS 485 Interface This leaflet is subjet to alteration without notice

17 HYDROVAR Single Pump Control 1) Constant discharge pressure over the flow range of the pump In this method, the desired discharge pressure is set (in bar) by the operator. The HYDROVAR varies pump speed as demand increases or decreases to keep the pressure constant. In order to set the HYDROVAR for this application, the pumps should be selected so that the maximum pressure and flow required by the system is on or below the full speed (usually 2950 rpm) performance curve of the pump. A single pump should not be selected it if cannot meet the maximum system requirements. Constant Pressure Control 2) Compensation for system losses (following system curve) The operator can increase the discharge pressure of the pump as the flow increases to compensate for the added friction losses in the system. This allows the pump to follow the system curve. To do this, the operator enters the percentage increase in discharge pressure required at the maximum speed and flow. In addition, the operator selects at which this increased pressure will start. The pump should be selected so that the maximum flow is on or below the 2950 rpm curve. An alternative method is to use a differential pressure transducer on a circulator suction and discharge. The HYDROVAR will automatically compensate the friction losses depending on the increasing flow and speed. Compensation for System Losses

18 HYDROVAR Single Pump Control 3) Maintaining a constant flow This method allows the operator to set a required flow in either circulator or process applications. The actual flow value can be measured either by means of a flow sensor (4-20 ma; linear) or by using an orifice plate in combination with a differential pressure transducer (4-20 ma; quadratic function). Correct settings must be made while programming the unit. As demand changes, the HYDROVAR increases pressure to maintain flow. The pump should be selected so that the flow required is left to the maximum efficiency point of the pump and the maximum pressure required is within the scope of the pump performance at full speed. Constant Flow Control 4) Actuar mode In actuator mode the pump speed can be varied by an external source using a 4-20 ma signal. In this case the built in controller is taken out of circuit. Actuator Mode 5) Protection from low/no suction or run out If the programmed limit (pressure or flow) cannot be achieved within a predefined period of time, the controller will switch off automatically. When the auto reset function is set on the controller, it will attempt to restart five times but will switch off completely after five unsuccessful attempts. This leaflet is subjet to alteration without notice

19 HYDROVAR Single Pump Control 6) Operator custom controls The HYDROVAR has several operator controls which may be selected for both single and multiple pump applications depending on working conditions and individual preferences. Please refer to the operating manual for specific programme options. l The HYDROVAR has language options available that can be preset for 7 different languages. l Except for the basic settings the HYDROVAR is password protected which that the programme can only be changed by authorised personel. The factory installed password is l The HYDROVAR can be set to operate at any frequency up to 70 Hz. In order not to overload the motor the unit should not be set frequencies higher than the nominal rating of the motor being used. l Units available can be programmed to show bar, psi, m 3 /h, gpm, mh 2 0, feet or percentage. l The display contrast can be altered to operator preference. l Test run of the HYDROVAR can be done manually or programmed to operate automatically at set times. l All the programme settings can be locked or reset to default factory settings. 7) Operator indicators and display (not for HV ) The following displays are found on the HYDROVAR, the unit can also be monitored remotely through the RS 485 interface. l Indicator lamps show power on, run and fault, which indicate the basic status of the unit. l The display shows a pressure reading, which shows the current pressure being read by the transducer. l The jog mode shows the current pressure and frequency in hertz, the operator can modify the speed by using the up/down button as a test. The HYDROVAR reverts back to its programmed settings once this display is changed. If the pump stops the HYDROVAR will record and display the last 5 error messages, which can be used for trouble shooting. l The number of hours of both the pump and HYDROVAR are logged. These settings can be reset

20 HYDROVAR Multiple Pump Operation and Control Up to four HYDROVAR controlled pumps can operate together to form a system. No other control panels are necessary. In a multi-pump system all pumps are connected over the RS-485 interface. The microprocessors monitor the activity in each HYDROVAR to adjust overall system performance. HYDROVAR controllers must be of the same size and type. HYDROVAR Multi-Pump System Constant Pressure Systems Constant pressure is maintaned by the HYDROVAR in a multi pump system in the same manner as a single pump system. The HYDROVAR can use up to four pumps to maintain constant pressure. However, as the first pump reaches maximum speed, increasing demand will cause the pressure to drop as the pump runs down is curve. In a single pump system, the pump would shut down at run out. On a multi pump system, the pressure drop causes the second pump to come online. Multi-Pump Constant Pressure System Curve This leaflet is subjet to alteration without notice

21 HYDROVAR Multiple Pump Control Set Up In a multiple pump system the HYDROVAR units are wired together through the microprocessor interface. The operator sets each HYDROVAR to multicontroller mode and assigns each pump an address (Adr.1, Adr.2, etc.). The operator enters the required system pressure and the pressure drop allowed before the next pump starts. Automatic Lead/lag The HYDROVAR will automatically change the sequence the pumps use to turn on or off in order to provide even wear. The operator can adjust how often this sequence change is made. Following a system Curve on Multi-Pump System To compensate for increase friction losses the overall pressure setting can be automatically upgraded every time an additional pump is started. 0 0 System Loss Compensation with Multi-Pump HYDROVAR System Set Up While programming the units the operator must set a pressure drop to allow an additional pump to come on line. However, the operator also needs to enter the amount of pressure increase needed for each new pump based on system losses at higher flows. As each new pump starts, the pressure required by the system is automatically increased by the amount entered. To determine the added pressure, the operator must deduct the pressure drop at which the next pump starts. Operator Controls and Indicators Controls and indicators for the multi-pump system are the same as those covered under the single pump controls and indicators

22 Regulation mode NORMAL Boiler Tank Control for pressure Flowmeter Orificeplate Control for flow Control for level Control for difference pressure Applications of the HYDROVAR with the regulation mode NORMAL (if the actual value drops, the output frequency will be increased) This regulation mode will be used to control on: l constant system pressure on the discharge side of the pump l constant diff. pressure l constant flow l constant level in a open or closed tank or boiler behind the pump This leaflet is subjet to alteration without notice

23 Regulation mode INVERS Tank Control for level Control for incomming pressure Application of HYDROVAR with regulation mode INVERS (the output frequency will be decreased if the actual value drops) This regulation mode will be used to control on: l constant incoming pressure l constant level on a tank which is mounted before the HYDROVAR pump Environment Ambient temperature requirements for the HYDROVAR are 5 C 40 C, the same range as most TEFC motors. Temperature limits may be extended to 52 C by using the next size of HYDROVAR controller upon request. Humidity requirements for the HYDROVAR cannot exceed more than 50% at 40 C and no more than 90% at 20 C. The unit should be protected from outdoor weather and condensation. The environment should also be free of excess amounts of dust, acids, corrosive gases, salts, etc. An interference filter is included in the HYDROVAR to prevent interference with other electronic devices. An LCD display on the control panel supplies all information and programming help. Pressure sensitive switches are included for on, off, increase, decrease and select. Display lights indicate power on to the HYDROVAR, pump running and fault. Operating temperature for the pressure transducer are 20 to 80 C. The upper limit may be extended to 120 C by using the extended mounting hardware on the SSV version

24 Additional functions, included as standard in all HYDROVARS l 2 required values programable; switchover by ext. dry contact 2 1 l Second analogue input 4-20 ma / 0-10 V Variation of the required value by external signal and limitation of the pump performance because of exceeding a limit of the second sensor signal (e.g. reducing the required flow, when level is below a minimum) and reducing the outlet pressure for fountains according to the wind velocity and mixing of 2 separate fluids at the same ratio 1 2 This leaflet is subjet to alteration without notice and... and... and

25 External Control and Monitoring PumpLink PumpLink has been developed especially for communication between Hydrovar pumps and PC. The built-in RS 485-interface enables to check and change all settings of each parameter of the HYDROVAR via PC. Additional it s possible to transfer default or saved parameter settings for different applications to the HYDROVAR-units. If there is an error in the system a message is sent automatically to the PC and indicates the failures of the system. You can define the digital inputs as well as the levels of the analogue inputs as a failure for an alarm message. The complete application is visually shown on the monitor together with the possibility of all used inputs. PumpLink displays online the status of the HYDROVAR units (up to 4 pumps) and also the flow rate, frequency of the masterpump and all actual values of the analogue inputs. The PumpLink unit saves switch intervals of the pumps, flow rate and all other analogue and digital signals for a later check and/or link to a PC. So it s possible to create reports as documents or graphic diagrams of hourly or daily consumption, level pressure. The standard connection between the PumpLink and the PC is a direct Link cable. Optionally can be also used a modem (standard telephone net or GSM-net). Please order detailed information about PumpLink at or send an to pumplink@hydrovar.com

26 Pump Sizing and Selection Constant Pressure To select a variable speed pump for constant pressure, two primary pieces of information are needed: the pressure required and the maximum flow rate of the system. When this information is known, check the range curves of the variable speed pumps being considered and select the one that covers the pressure rating up to the maximum flow rate. This point should be to the right of the pump BEP and within 10% efficiency points of the best efficiency. To keep the power requirement down, the selected pump should meet the maximum pressure and flow point at or near the maximum pump speed curve. In a multi-pump arrangement, the pumps may be selected to provide only part of the total flow needed. This will provide a builtin backup for most of the flow range and also balance pump wear with use of more than one pump. NPSH should also be calculated based on the maximum flow and pressure rating point.this is a worst case condition because lower speed performance will require less NPSH. Selection of pressure controlled pumps Constant Flow In a constant flow application a single pump, which has the flow range needed, is typically selected as shown in opposite picture. For this application, the BEP of the pump should be right of the required flow rate. Selection of flow controlled pump This leaflet is subjet to alteration without notice

27 System Comparison HYDROVAR System vs Fixed Speed Systems Since a conventional pump can only operate along its performance curve, a constant pressure system must always involve other components in order to regulate the supply of liquid to the user. These other components can add up to much than the cost of the pump alone. With the HYDROVAR system, large pressure tanks are not required. Each unit has a soft start and gradual ramp up to eliminate premature pump wear and water hammer and also reduce energy costs at periods of low demand. A typical two pump HYDROVAR system requires no more than a vessel volume of 10% of the l/min performance of one pump. The precharge pressure of the vessel must be set to approximately 10-15% less than the system pressure requirement. Pressure Switches Pressure switches are normally installed at the discharge of each pump in the system and used to turn each one on and off as demand changes and are connected to a control panel to sequence the pumps. The pressure switch is an on/off device that does not provide information on the system demand below or above the set point a distinct disadvantage. In the HYDROVAR system, each pump is equipped with is own pressure transducer to measure the required system pressure. This allows the pump to react to very slight changes in demand with the correct amount of pressure and flow. A pressure switch or float control may be used on the suction side of a HYDROVAR equipped pump as a cut off for low / no suction. Control Panels A typical multi-pump booster package has a control panel that provides protection and sequencing of the pumps. More sophisticated units will have a microprocessor that controls pumps and valves and interprets input from the switches and floats. Some panels also have a variable frequency drive. Panels with microprocessor control and or VFC control are significantly more expensive than a standard panel. With the HYDROVAR, no control panel is needed. The HYDROVAR contains all the functions of the most sophisticated microprocessor based VDF panels. Sequencing and start/stop controls are communicated directly by the HYDROVAR to each pump extra controls are not needed for multi-pump systems. The HYDROVAR requires only a circuit breaker panel. Automatic Valves Solenoid valves or modulating/metering valves are used to control flow and pressure as the pumps keep running. Continuous duty boilers use this method. Use of these valves can create problems of water hammer and dead heading for the pump. Bypass lines and pressure tanks are used to handle these types of problems. The HYDROVAR eliminates the need for automatic valves to control the pressure, flow or shut off of liquid to the system. All these features are contained within the microprocessor controlled variable speed pump. In addition, since there is no danger of valve water hammer or dead heading, bypass lines and pressure accumulators are not required. Jockey Pump The standard booster system is sized for peak capacity and is very inefficient when demand is low. For this reason, a high head low flow pump is added to the system to handle occasional demand during off peak periods. This pump will run with a much lower power requirement and reduces wear on the main pumps. The HYDROVAR can drive the pumps at very low speeds and energy consumption, eliminating the need for a jockey pump. Off peak demand can be handled efficiently and easily with the same system used for peak periods. However, if main pumps become bigger a smaller pump also drive by a HYDROVAR can be incorporated into the system to cover low demand duties in a more efficient way

28 Hydraulic Performance Operating range HYDROVAR 22,0 kw Motor mounted or wall mounted Operating range HYDROVAR split, 45,0 kw Four mounting on the wall only! This leaflet is subjet to alteration without notice

29 Features and Benefits Features and Benefits Feature Advantage Benefits Variable Speed Microprocessor Control Multi-pump control On-line transducer Electronic Control Match Pump Performance to system demands Constant pressure Lower mechanical load Less system compenents Pump protection System curve compensation On-line-interface Pressure sensing Electrical protection Soft start and stop Eliminates start stress l Maximises system performance l Reduces power consumption l One pump selection for full performance range l Stepless transition for steady supply l Reduces intermittent operation l Eliminates large storage tank cost and space l Energy savings l Higher reliability l Space savings l Assembly savings l Single source supply l Simplified design l No flow shutoff l various fault protections l Eliminates bypass lines l Eliminates pressure modulation and metering valves l Reduces power consumption l Meets changing demand l Eliminates separate panel l Automatic sequencing l Automatic lead/lag l Remote monitoring and status display l Remote control l Maintain constant pressure l Friction loss compensation l Maintain constant flow l Long service life l Low starting current l No water hammer

30 Multistage pumps SVH, MPBH Design VDH (with HYDROVAR variable speed pumps) This leaflet is subjet to alteration without notice Package booster unit VDH 2 Package booster unit VDH

31 Single stage Inline pump FCEH Cooling water circulating pumps Heating circulators Circulating pumps for heat exchanger