Calpeda Units constructed in accordance with UNI-EN 12845 standards for automatic fire-fighting systems - Ej, Dj

Applications
Supply of automatic fire extinguishing systems with sprinklers and hydrants.

Functioning mode
The pumps start operating after a fall in the pressure level in the fire extinguishing system.
The first one to start is the compensation pump (where present); if it fails to restore the pressure, the feed pump intervenes.
When there is more than one main pump, the pumps start in cascade sequence, with the starting pressure switches set at different pressure levels.
The pressure switches of the main pumps are used only for starting, as the pumps must be stopped manually for UNI-EN 12845 units or automatically with a timer for UNI 10779 sets.
The recirculation diaphragm allows for operation of the main pumps also when the delivery port is closed (with no consumption of water in the system), avoiding overheating of the water inside the pump body.

Pumps
Main pumps.
The N series centrifugal pumps are coupled with the electric or diesel motor through a bearing coupling. This solution allows to operate on the hydraulic part without moving the motor.

Jockey pump
Jockey pump can be a self-priming jet pump, a centrifugal pump with two impellers.
The maximum pressure developed by the jockey pump is always greater than the pressure of the main pumps.

Electric motor
Two-pole induction type, 50 Hz, n = 2,900 rpm
Three-phase 230/400V ± 10% up to 3 kW
400/690V ± 10% 4 kW and higher.
Insulation class F.
IP protection: IP55
Construction in accordance with: IEC 60034
Other voltages and frequencies on request.

Diesel motors (for standardised N-series pumps)
These are direct-injection pumps fitted with electric control box, fuel tank, starter batteries and silencer.

Designation
Example: EJ11 N 40-250C
EJ = Series
1 = A feed pump
1 = A compensation pump
N 40-250C = Feed pump type

Hydraulic components
Each main pump is fitted with:

• Butterfly valve in the suction section (on request only for installation with positive suction head).
• Pressure gauge in the delivery section.
• Recirculation diaphragm.
• Non return valve of the accessible swing-type or dual disc non-return valve, depending on the models.
• Butterfly valve in the delivery section.
• Manual test circuit with pressure switches, pressure gauge, nonreturn valve and ball valve.

The jockey pump is fitted with:

• Ball valve in the suction section.
• Non-return valve and ball valve in the delivery section.
• Circuit with pressure switch, pressure gauge, non-return valve and ball valve.

Other components:

• Delivery manifold.
• pumps installed with positive suction head).
• 20 litre cylindrical tank on the delivery manifold.
• Arrangement for sprinkler connection to the pump compartment
• Pressure switch for pump working signal
• ..
• ..

On request:

• Manifold for flow meter.
• Adjusted-flange, diaphragm type, flow meter.
• Eccentric conical reducers on suction side.
• Interception valves on suction side (for installations under positive suction head).

Control panels
Electric main-pump box (electric motor)
Each main pump has its own electric control board housed in a metal cabinet with IP55 protection. The box contains the devices required for operation and control of the pump.
For motors with a rating equal to or higher than 22 kW pump starting is of the Y/∆ type with fuses, contactors and timer.

• Timer for pumps stop after 20 minutes (UNI 10779)

The following devices are located on the front of the box:

• Line-sectioning handle.
• Front panel of the electronic unit.
• Manual-0-Automatic selector with extractible key only an “automatic” position.
• Start/stop buttons.
• LED indicating: voltage present, pump running, pump stopped, low pressure.

Electric main-pump box (diesel motor)
This cabinet contains the electronic control devices for the control of the diesel motor and the battery chargers for feeding the starter accumulators.
The following devices are located on the front of the box:

• Line-sectioning handle.
• Front panel of the electronic unit.
• Manual-0-Automatic selector with extractible key only an “automatic” position.

Electric jockey-pump box
When installed, the jockey pump is fitted with its own electric panel, with thermoplastic housing with IP 55 protection.

Control box (on request).
To be installed in a place to be looked after, to signal any possible failure of the unit state. It must be connected to V.220 and it gives an acoustic and visual signal for 24 hours.