Xylem AquaBoost CS and VS Pumping Packages - Manual (Page 33)

System pressure switches for constant speed units
WARNING:
Always disconnect and lock out power to the package and the driver before you perform
any installation or maintenance tasks. Failure to disconnect and lock out driver power will
result in serious physical injury.
The simplex unit has one switch and the duplex unit has two switches: one for each pump.
Each switch is piped to the discharge piping.
Two adjusting screws are located on the top of the control. Facing the switch, the screw on
the right-hand side sets the cutout pressure. Make this adjustment first.
The screw to the left and towards the front sets the cut-in point. Turn this screw until the
proper cut-in pressure is obtained.
1 2
RS000032
1. The silver adjusting screw on the left front is for cut-in adjustment.
2. The yellow adjusting screw on the right is for cutout adjustment.
Although the scales are calibrated in psi, they may not correspond exactly to the actual
discharge gauge indication. Therefore, for critical installations, adjust the settings
according to the gauge reading.
For the proper settings of the system pressure switches on a duplex unit, see the wiring
diagram for
AquaBoost CS duplex – 575/460/208-230/3/60, 380/3/50 up to 5 hp (page
22).
Minimum run timer
For a constant speed simplex unit the minimum run timer is set at the factory to 5 minutes.
Verify the setting before placing the unit into operation; adjust if a shorter minimum run
time is desired.
For the constant speed duplex unit, use the programmable pump sequence control
module to set the minimum run timer for each pump.
Programmable pump sequence control module settings
The constant speed duplex package uses a smart relay as its control module.
This table shows the user-adjustable settings of the smart relay. You can manually set
parameters using the backlit LCD display and buttons.
Parameter description Default setting
(seconds)
Variable range
(seconds)
Field setting
Lead pump minimum run timer 30 0-999
Lag pump minimum run timer 30 0-999
Lead pump start delay timer 1 0-99
Lag pump start delay timer 5 0-99
Commissioning, Startup, Operation, and Shutdown
AquaBoost CS and VS Pumping Packages Installation, Operation, and Maintenance Manual 31