BIA-DPC1 rev 4
Page 26
3.5.1 Water supply by pressure control through pressure switch and tank (cont)
Normal demand
Pressure in the pipeline is lower than the setting of pressure switch B, control box will order single pump to
run; pressure in the pipeline reaches the setting of pressure switch B, single pump stops running; control box
will alternate double pumps running automatically when pressure in the pipeline varies in the range of
pressure switch B
Extra demand
Single pump is running, pressure in the pipeline still decrease to the setting of pressure switch A, control box
will order another pump to run simultaneously, till pressure in the pipeline reaches the setting of pressure
switch B, double pumps will not stop running; Note: pressure switch should be N/C, close on pressure drop.
Note: Pressure switch A = Low Pressure Switch, Pressure switch B = High Pressure Switch
Meanings of the messages & graphic shown on the LCD screen
