Pressure Sensor; Table 3: Pressure Boosting Operation Standard Vessel; Table 4: Operation With Additional Expansion Vessel > 100 Litres; Figura 17: Regulation With Expansion Vessel - DAB E.Box Plus Instructions Pour L'installation Et La Maintenance

Pressure sensor:

RP is the pressure differential, and indicates the pressure variation around the Set Point for which the pumps are switched on. In systems with a
display it is set directly. In systems without a display, DP is set as a percentage of the Set Point. RP = SP*DP. For further information see Figure
17 and Figure 18.
The operating logic is the following:
Pumps
P1
P2
Pumps
P1
P2
The first pump starts when the pressure falls below the Set Point and it stops when it reaches the Set Point pressure + differential
•
restarting pressure.
•
The second pump starts when the pressure falls below the Set Point minus half the differential restarting pressure, or 2% of the Set
Point if vessels over 100 litres are used. It stops when the pressure in the system reaches the Set Point pressure + differential restarting
pressure.
Attention: If DIP SWITCH configuration is used, the differential restarting pressure is calculated as SP * DP. If the set point is 4
bar and DP is 50%, the restarting pressure RP is 2 bar.
The indications pump P1 and P2 are only indicative. If exchange mode is activated, the pumps P1 and P2 are alternated as
specified in the exchange mode.
The two pumps will always be started alternately with a minimum interval of 2 seconds from each other.
Example of Regulation with Standard expansion vessel and Regulation with additional expansion vessel:
SP= 4 bar
RP = 2 bar Attention: if DP is set (with the trimmers) RP=SP*DP
Figura 17: Regulation with expansion vessel < 100 litres
Pressure boosting operation standard vessel < 100 litres
Start
System pressure <= SP
System pressure <= SP – RP/2
Table 3: Pressure boosting operation standard vessel < 100 litres
Operation with additional expansion vessel > 100 litres
Start
System pressure <= SP
System pressure <= SP – 2%
Table 4: Operation with additional expansion vessel > 100 litres
ENGLISH
System pressure => SP+RP
System pressure => SP+RP
System pressure => SP+RP
System pressure => SP+RP
Figura 18: Regulation with expansion vessel > 100 litres
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Stop
Stop