ETNA EPH B-M46 Series, Installation, Operation, Service, And Parts Manual

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10. Liquid Level Higher Than the Booster or 

At The Same Level

Close the discharge valve, remove the fill/bleed plug and 
open the suction valve until the water flows out of the fill/
bleed plug. Then close the plug.

11. Liquid Level Lower Than the Pump 

(Negative Suction)

Close the discharge valve, remove the fill/bleed plug 
and by means of a funnel fill the water, close the plug.

Note : Adjust the float switch according to the size of 
the tank. (Page 9)

12. Checking the Rotation Three-Phase 

Motors

After connecting and filling, start the pump with the 
discharge valve closed and check that the rotation 
direction is correct (shown on the coupling and the 
motor) through the coupling protection or fan cover. If 
the direction of rotation is not correct, stop the motor, 
disconnect from the mains and invert two wires on the 
terminal board. B

13. Operation

Start up the booster set with the discharge (delivery) gate 
valve closed and fallow pump or pumps reaching to the 
switched-off pressure of the unit from the manometer. 
Then open the service tap and check the system pressure 
is dropping and the pump or the pumps running at 
the starting pressure. If everything is okay, open all the 
gate valves in the delivery line and let the system under 
booster-set pressure. 

14. Operations Description
14.1 Example for two-pump sets

The starting and stopping of the pumps are determined 
by the pressure values set on the pressure switches. 
Each pressure switch is connected to a single pump 
with a cyclic pump change over. The differential 
pressure is the pressure difference between starting 
pressure and switch-off pressure. It is set at the same 
value for both pumps.Figure 6 shows the operating 
mode with the pumps curves

On demand, water is drawn from the tank
•  When the pressure drops to the P1 value the first 

pump starts.

•  If the water consumption increases and the 

pressure drops to the P2 value, the second pump 
starts.

•  When consumption reduces and the pressure 

increases until it reaches the P2s value, one of the 
pumps is switched off.

•  If consumption keeps reducing, the pump charges 

the tank and stops at the P1s value.

3 and 4 pumps booster sets have the same operation 

sequence

15. Fire Fighting Booster Sets

15.1 Usage

Fire fighting boosters should not be used for anything 
other than fire-fighting. They should not be used for 
garden irrigation, building installation, vehicle washing 
etc.

1 - Valve

2- Check valve

3- Float valve

4- Float switch

5- Service tap

6- Upright valve

7- Strainer

8- Water Tank

1

1

2

2

5

3

4

* The suction pipe should be at least 15 cm above the tank bottom.

*

To the building

Mains

Operating level

Stoppage

Level

Starting-Stop

Level Setting

7

8

Important:

Check valve should not be installed on 

the delivery line of the booster sets 

with negative suction level. The upright 

valve installed on suction also acts like 

a check valve.

# A check valve should not be installed on 

the delivery line of the plumbing either.

To the building

1

1

2

Mains

6

1

3

4

7

P1s

H

P2s

P1

P2

Figure 5

Figure 6