Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 81)

The Setpoint Boost [22-45] function can be used to further reduce cycle time. The Setpoint
Boost function increases the system pressure before the pump enters sleep mode. To
configure this function, exit the Genie and enter the parameter list by pressing the [Main
Menu] key. Set parameter [22-45] Setpoint Boost and [22-46] Maximum Boost Time.
Setpoint Boost [22-45] is the amount of increase in system pressure desired before the
pump enters sleep mode. This is entered as a percent of setpoint. The Maximum Boost
Time is a timeout function used to ensure the pump enters sleep mode. If the pump
cannot achieve the setpoint + Setpoint Boost pressure before the Maximum Boost Time
expires, the pump will enter sleep mode.
Flow check
The Flow Check function performs a test to determine whether flow or demand exists in
the system. If a no flow condition exists in the system the pump will ramp down to Sleep
Frequency and enter sleep mode. The Flow Check function is performed only when the
pump is running. A diagram showing the Flow Check function is shown below. Motor
speed is shown to illustrate the pump reaction to the Flow Check function. As shown in
the diagram, when demand (flow) stops, the Flow Check function forces the system
pressure to be higher than the Pressure Setpoint which forces the pump to enter sleep
mode.
NOTE: This function is not available in Duplex Control mode.
To configure the Flow Check function first set the Flow Check Window. The Flow Check
Window is the amount of pressure increase that will be used during the Flow Check
function test. This amount is added to the existing setpoint to create a new temporary
setpoint. Next set the Flow Check Low Time and the Flow Check High Time. The Flow
Check Low Time defines how long the controller will run at the setpoint before applying
the value set in Flow Check Window. The Flow Check High Time defines how long the
controller will run at setpoint plus the value set in Flow Check Window. These times are
Operation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 79