DAB E-BOX 2D M/T - 11. PRESSURE BOOSTER FUNCTION; Operation Modes (Sensor & Pressure Switch)

ENGLISH
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11. PRESSURE BOOSTER FUNCTION
11.1 Operation with sensor
Operation with a sensor allows 2 types of regulation:
 Regulation with Standard expansion vessel = 19 litres each pump (DS_A1=ON).
 Regulation with Additional expansion vessel = over 100 litres (DS_A1=OFF).
Regulation is obtained by turning the trimmers SP (system pressure) and DP (differential pressure).
Regulation with Standard expansion vessel
Sequence Pump P1
Pump P2
START System pressure = < SP
Pump P1 = started.
Pump P2 = starts with System Pressure = < SP – ½ DP
STOP System pressure > = SP+DP
Pump P1 = stopped.
Pump P2 = stops with System Pressure > = SP+DP.
Regulation with Additional expansion vessel
Sequence Pump P1
Pump P2
START System pressure = < SP
Pump P1 = started.
Pump P2 = starts with System Pressure = < SP – 2%
STOP System pressure > = SP+DP
Pump P1 = stopped.
Pump P2 = stops with System Pressure > = SP+DP.
11.2 Operation with pressure switches
The pressure switches of the pumps P1 and P2 must be connected to the respective terminals B and C.
Sequence Pump P1
Pump P2
START Pressure switch B = ON
Pressure switch C = ON
STOP Pressure switch B = OFF
Pressure switch C = OFF
N.B. The indications pump P1 and P2 and the references B and C are only indicative.
N.B. The indications pump P1 and P2 are only indicative.
Example of Regulation with Standard expansion vessel and Regulation with Additional expansion vessel
SP= 4 bar (starting pressure P1)
DP = 50% of the value of SP = 1/2 (differential pressure)
Regulation with Additional expansion vessel Regulation with Standard expansion vessel
DP
SP
H
4
t
6
3,9
6
P1
OFF
4
P2
ON
P1
ON
P1
ON
P1 e P2
OFF
DP
SP
H
4
t
6
3
6
P1
OFF
4
P2
ON
P1
ON
P1
ON
P1 e P2
OFF
DP ½