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6.2 Tank precharge pressure
The precharge pressure of the diaphragm tank (or bladder tank)
should be set to 0.9 x cut-in pressure. See recommended
precharge pressure in section 6.1 when the factory settings of the
pressure switch are used.
6.3 Setting procedure
To change the factory settings, proceed as follows:
1. Open the discharge valve between the pump and the
discharge pipe.
2. Open the valve on the suction side.
3. Open the valve between discharge pipe and diaphragm tank
(or bladder tank).
4. Close all taps on the discharge side, start the pump and note
the pressure at zero flow (p
5. Calculate the cut-out pressure:
Cut-out pressure = p
- 0.3 up to 0.5 bar.
max
6. Calculate the cut-in pressure:
Cut-in pressure = cut-out pressure - 1.5 bar.
Note:
- Δp < 1.5 bar decreases the drawdown volume of the tank
and increases the number of starts/stops per hour.
- Δp > 1.5 bar makes it uncomfortable for the user.
7. Calculate the tank precharge pressure:
Precharge pressure = 0.9 x cut-in pressure [bar].
Note:
The maximum precharge pressure can be limited, depending
on type of tank. See necessary actions in section 6.2.
8. Stop the pump, open the taps on the discharge side and drain
the pipes, pump and tank
(making the discharge pressure = 0).
9. Set the calculated tank precharge pressure.
10. Start the pump and set the calculated cut-out pressure
(pos. 1, fig. 5).
11. Set the calculated cut-in pressure (pos. 2, fig. 5). Check the
cut-in pressure by opening and closing taps in the discharge
system.
12. Perform a final test to make sure that the cut-in and cut-out
pressures are correct.
7. Start-up
To start up a Hydro Pack booster set, proceed as follows:
1. Connect water and electricity supplies.
2. Check that the tank precharge pressure is equal to
0.9 x cut-in pressure.
3. Close the pump discharge valve, prime the booster set and
the suction pipe.
4. Check that the settings have been carried out according to
section 6.
5. Three-phase versions only: Set the automatic circuit
breaker to the rated current stated on the motor nameplate.
6. Switch on the power supply, i.e. main switch, automatic circuit
breaker, etc.
7. Start the pump.
8. Three-phase versions only: Check the direction of rotation
of the pump. In case of incorrect rotation, interchange two
phases of the power supply.
9. Vent the pump by slowly opening its discharge valve.
The Hydro Pack is now ready for operation.
[bar]).
max
8. Maintenance
8.1 Maintenance of booster set
See installation and operating instructions for CHV pumps.
8.2 Maintenance of CS 103
The CS 103 controller is maintenance-free.
8.3 Checking the precharge pressure
To ensure reliable and correct operation, including the frequency
of starts and stops, the precharge pressure of the diaphragm tank
(or bladder tank) should be checked regularly (at least once a
year).
9. Technical data
Voltage variants, rated voltages
1 x 220 - 240 V.
3 x 380 - 415 V.
Voltage tolerances
- 10 %/+ 6 % of rated voltage.
Mains frequency
50 Hz.
Enclosure class
CHV pump motor: IP54.
Pressure switch: IP54.
Sound pressure level
The sound pressure level of the pump is below 70 dB(A).
Liquid temperature
0 °C to +40 °C.
Ambient temperature
0 °C to +40 °C.
Operating pressure
Maximum 10 bar.
Minimum inlet pressure
In accordance with the NPSH curve plus other losses and a
safety margin of at least 0.5 metres (1.64 feet) when pumping
airless water.
The safety margin should be increased when air-containing water
is pumped.
Maximum inlet pressure
The actual inlet pressure plus the pressure when the pump is
operating against a closed valve should always be lower than the
maximum operating pressure, i.e. 10 bar.
Start/stop frequency
Maximum 100 per hour.
Liquid temperature and operating pressure may be limited by the
diaphragm tank (or bladder tank).
For further technical details, see installation and operating
instructions for CHV pumps.
CS 103 controller
•
Enclosure class: IP65.
•
Insulation: Double-insulated cabinet.
•
The controller must not be exposed to direct sunlight.
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