Water pressure system with or without frequency inverter

Published by Wilo Portugal, Lda

Infrastructure type(s)
Hospitais; Pools; Hotels; Schools; Sports facilities; Child care, elderly care and other social services facilities; Shopping centers; Other

Intervention domain(s)
Water Heating; Building Technical Management; Water Supply and Sewage Systems in Buildings; Building (Water) Use Devices; Rainwater Harvesting Systems; Energy Efficiency; Construction; Building design

Keyword(s)
Domestic hot water Energy efficiency Rainwater Harvesting Systems Non-residential buildings Energy consumption Water audit Construction management Construction Building design

Description

Compact pressure-boosting system according to DIN 1988 and DIN EN 806, for direct or indirect connection. Consisting of non self-priming, switched in parallel, vertically-mounted stainless steel high-pressure multistage centrifugal pumps in glanded versions, for which each pump is fitted with a frequency converter. Ready for connection with stainless steel pipework, mounted on a base frame, including control device with all necessary measurement and adjustment equipment.
For fully automatic water supply and pressure boosting in residential, commercial and administrative buildings, hotels, hospitals, department stores and for industrial systems.
For pumping drinking water, process water, cooling water, firefighting water (apart from fire-extinguishing systems in accordance with DIN 14462 and with the approval of the local fire protection authorities) or other types of industrial water that do not attack the materials either chemically or mechanically and do not contain abrasive or long-fibre constituents.

Special features/product advantages
- Heavy-duty system that fulfils all the requirements of DIN 1988 (EN 806)
- Valves and sensors are protected for safe and reliable installation
- Optimum pump load adjustment due to pressure-variable (pv) control mode and parallel synchronous speed control for higher energy savings
- WRAS/KTW/ACS approval of the pumps for all parts that come into contact with the fluid (EPDM version)
- Helix EXCEL series high-efficiency pump hydraulics, electronically controlled by EC motors with air-cooled integral frequency converters
- Highly efficient EC motor with high-efficiency drive (energy efficiency class IE5, limit value according to IEC 60034-30-2)
- Energy-saving thanks to superproportionally large frequency converter control range of 25 Hz up to a maximum of 60 Hz
- Integrated dry-running detection with automatic cut-out in event of low water via performance characteristics of the motor control electronics
- Bidirectional mechanical seals in the pumps for easy maintenance
- The flexible lantern design enables direct access to the mechanical seal
- The spacer coupling enables the mechanical seal to be replaced without dismantling the motor (from 7.5 kW)
- Hydraulics of entire system are pressure-loss optimised.
- Intermediate bearings of ceramic (Al203/CW) ensure a long service life
- Parts that come in contact with the fluid are corrosion-resistant
- SCe comfort control device, maximum degree of control performance with symbol-based LCD display, simple navigation with clear menu and Green Button Technology for setting parameters for controlling the electronic pumps with frequency converters
- Ready for integration into building automation with the SCe switchgear via standard Modbus RTU
- Factory inspection and default setting at optimum operating range (incl. inspection certificate in accordance with EN 10204 – 3.1)

Equipment/function
- Stainless steel high-pressure multistage centrifugal pumps of Helix EXCEL 2 to Helix EXCEL 52 series
- Base frame made of electrolytically galvanised steel, with height-adjustable vibration absorbers for insulation against structure-borne noise
On pressure side:
- Shut-off valve at each pump
- Non-return valve at each pump
- Diaphragm pressure vessel 8 l, PN 16
- Pressure sensor 4...20 mA
- Pressure gauge
On suction side:
- Shut-off valve at each pump
- Pressure sensor 4...20 mA
- Pressure gauge
- Automatic pump control by means of a fully electronic
Smart-Controller (SCe) in a sheet metal enclosure, protection class IP54, consisting of an internal control voltage supply unit, microprocessor with Soft PLC, analogue and digital inputs and outputs, for control of electronic pumps with frequency converters.
A working area of 1 m around the system is recommended in order to facilitate the maintenance process.

Operation/display
- LC display (backlit) for display of the operating data, controller parameters, operating statuses of the pumps, error messages and history memory
- Menu navigation with symbols and menu numbers
- LEDs for display of the system status (operation/fault)
- Factory-preset parameters for easy commissioning/start
- Setting of operating parameters and acknowledgement of fault messages using Green Button Technology
- Lockable main switch
- Operation with/without standby pump selectable by customer service
- Elapsed time indicator for each pump and for entire system
- Switching cycle counter for each pump and for entire system
- Fault memory for the last 16 faults

Control
- Fully automatic control for 1 – 4 frequency-controlled pumps by means of setpoint/actual value comparison
- Setpoint changeover: Second setpoint can be activated by contact
- External remote setpoint adjustment by 4…20 mA signal
- Automatic, load-sensitive cut-in of 1 to n peak-load pump(s) depending on the control variable “pressure constant” (p-c) or “pressure variable” (p-v)
- 2 parameter sets selectable, easy menu (setpoint #amp; control mode) or expert menu (operation and control parameters)
- Operating mode of the pumps freely selectable (manual, off, automatic)
- Automatic, configurable pump cycling
- Standard setting: Impulse - The base-load pump is cycled at each new demand, regardless of operating hours
- Alternative: Pump cycling dependent on operating hours, cycling of the base-load pump after the specified operating hours
- Automatic, configurable pump test run (pump kick)
- Can be activated/deactivated
- Time between two pump test runs is freely programmable
- Disabling times can be programmed as desired
- Speed can be adjusted as desired

Monitoring
- Actual value of the system is output via a 0 – 10 volt analogue signal for external measurement/display applications, 10 volt depending on the sensor range value
- 4 – 20 mA sensor signal (conductivity test of the sensor cable) for control variable actual value
- The pump mains power feed is protected via the circuit breaker
- Automatic switchover to standby pump in the event of an operating pump fault
- Monitoring of maximum and minimum system values with adjustable time delays and limits
- Zero-flow test for switching off the system when no water is being drawn off (adjustable parameters)
- Pipe filling function for filling empty pipes (initial filling of the consumer network)
- Protection against low water level via contact, e.g. for float switch or pressure switch
- Automatic shutdown of pumps if fault occurs or operation at preset emergency operation speed

Interfaces
- Potential-free contacts for SBM/SSM collective operation and collective fault signals
- Logic reversal can be applied to SBM and SSM
- Contacts for external on/off, low water and second setpoint
- External on/off via contact for deactivation of the system's automatic mode

Optional accessories (factory installation or retrofitting after technical checks)
- Individual operation and fault signal, low-water signal
- Signal converter for 0/2 – 10 V to 0/4 – 20 mA

Recommended accessories (to be ordered separately)
- Low-water cut-out switchgear, optional
- Flexible connection pipes or compensators
- Diaphragm pressure vessel
- Threaded caps for systems with threaded manifold

Bus systems (optional)
- LON-Bus, Modbus TCP, BACnet MSTP, BACnet IP

Standards followed
- Specifications for drinking water installations (TRWI) DIN 1988 (EN 806)
- Diaphragm pressure vessel/diaphragm expansion tank DIN 4807
- Electronic equipment for use in power installations, EN 50178
- Electrical Equipment of Machines EN 60204-1
- Safety of household and similar electrical appliances EN 60335-1
- Low-voltage switchgear and controlgear assemblies EN 60439-1/61439-1
- EMC – Immunity for industrial environments EN 61000-6-2
- EMC – Emission standard for residential, commercial and light-industrial environments (EN 61000-6-3)