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, horizontally-mounted stainless steel high-pressure centrifugal pumps in a glanded version. 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 public buildings, hotels, hospitals, department stores and for industrial systems.

For pumping drinking water, process water, cooling water, fire water (apart from fire-extinguishing systems in accordance with DIN 14462 and with the approval of the local fire safety 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 benefits

• Heavy-duty system which satisfies all the requirements of DIN 1988 (EN 806)
• WRAS/ KTW approval of the pumps for all parts that come in contact with the fluid (EPDM version)
• Pumps in the MHI series in conjunction with IE2 IEC standard motors (from 0.75 kW)
• Bidirectional mechanical seals for pumps
• Parts that come in contact with the fluid are corrosion-resistant
• Fully electronic Economy controller (ER2/ER3-4) with control electronics and LEDs to indicate the system status, analogue and digital inputs and outputs
• Factory inspection and default setting at optimum operating range (incl. acceptance test certificate based on EN10204 - 3.1)

Equipment/function

• Stainless steel high-pressure centrifugal pumps of the MHI series
• Base frame made of electrolytically galvanised steel, with height-adjustable vibration absorbers for insulation against structure-borne noise
• Shut-off valve on the suction and pressure sides of each pump
• Non-return valve on the pressure side of each pump
• 8 litre diaphragm pressure vessel, PN16 including throughflow fitting to DIN 4807, pressure side
• Pressure sensor (4-20 mA), pressure side
• Pressure gauge, pressure side
• Automatic pump control by means of a fully electronic

Economy Controller (ER) in a sheet metal enclosure painted RAL 7035, protection class IP 54 consisting of an internal power supply unit, control electronics, analogue and digital inputs and outputs

Operation/ display

• Fully electronic Economy controller (ER2/ER3-4) consisting of an internal power supply unit, control electronics, analogue and digital inputs and outputs
• Configuration of operating parameters via potentiometer, hook switch and rotary switch
• LEDs for display of the system status (operation/fault/low water)
• Configuration of pump operating mode via H-0-A switch
• Main switch

Control

• Fully automatic control for 2-4 fixed speed pumps by means of setpoint/actual value comparison
• 4-20mA sensor signal (with conductivity test) for control variable actual value
• Automatic, load-sensitive cut-in of peak-load pump(s) depending on the pressure - constant, p-c control variable
• Pressure surge optimised switch-off of the base-load pump thanks to freely settable 2nd Pressure level after enabling a time follow-up element (1-180 s.)
• Automatic, configurable pump cycling with service life optimisation:
• The base-load pump is cycled at each new demand after system shutdowns, regardless of operating hours
• Pump cycling dependent on operating hours, cycling of the base-load pump after six operating hours
• Operating mode of the pumps freely selectable (manual, off, automatic)
• Automatic pump test run (pump kick):
• Can be activated
• Time between two pump test runs (approx. 10 sec. duration) is ten hours
• Zero-flow cut-off over pressure and time
• H-0-A (manual-zero-automatic) switch: Preselection of the operating mode for the pumps and manual operation in the event of a manual controller fault (emergency/test mode available at mains power, WSK (motor) protection available, time-dependent reset), 0 (pump switched off – cannot be switched on using the controller) and Auto (pump enabled for automatic mode via the controller), acknowledgement of error signals in position 0

Monitoring

• Internal motor current monitoring with converter or
• External motor protection via PTC thermistor sensor (PTC) or thermal winding contact (WSK)
• Protection of the pump mains power feed via fuses (safety fuses)
• Monitoring of maximum and minimum system values with adjustable time delays and limits
• Protection against low water level via contact e.g. float switch or pressure switch
• Optional protection against low water level via electrodes and level control relays
• Automatic changeover to the standby pump in the event of a operating pump fault
• Preselectable response in the event of a sensor fault

Interfaces

• Potential-free contact (24V/DC, 1A) for collective fault signal (SSM)
• Input for protection against low water level contact
• Optional: Potential-free contacts (24V/DC, 1A) for individual operation and fault signals

Optional accessories (factory installation or retrofitting after technical checks)

• Dry-running protection SK 277, level control relay SR-NW
• Elapsed time indicator for each pump, run signal
• Pressure switch, digital pressure indicator

Recommended accessories (to be ordered separately)

• Optional WMS low-water cut-out switchgear kit;
• Flexible connection lines or expansion joints
• Break tank for system separation
• Diaphragm pressure vessel
• Threaded caps for systems with threaded joint tubing

Standards followed

• Specifications for drinking water installations (TRWI) DIN 1988 (EN806)
• Diaphragm pressure vessel/ diaphragm expansion tank DIN 4807
• Electronic Equipment for Use in Power Installations (EN 50178)
• Electrical Equipment of Machines (EN 60204-1)
• Household and Similar Electrical Appliances - Safety (EN 60335-1)
• Low-voltage switchgear combinations 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)

Operating data

• Fluid media
  Water
• Number of pumps
  3
• Maximum operating pressure PN
  10 bar
• Maximum inlet pressure p inl
  10 bar

Motor data

• Mains connection
  3~400 V, 50 Hz
• Rated power P₂
  2.20 kW
• Rated current I_N
  5.40 A
• Rated speed n
  2900 rpm
• Insulation class
  F
• Protection class motor
  IP54
• Protection class switchgear
  IP54

Materials

• Pump housing
  1.4301
• Impeller
  1.4301
• Shaft
  1.4301
• Shaft seal
  BQ1E3GG
• Gasket material
  EPDM
• Pipework material
  1.4571

Installation dimensions

• Pipe connection on the suction side DNs
  DN 100
• Pipe connection on the pressure side DNd
  DN 100

Information for order placements

• Brand
  Wilo
• Product description
  Economy CO-3 MHI 1603/ER
• Net weight, approx. m
  158 kg
• Article number
  2534333