Xylem AquaBoost CS and VS Pumping Packages - Manual (Page 35)

Condition Description
The lead pump fails. The lag pump starts and acts as the lead pump.
To reinstate the lead pump do the following:
1. Before fixing the failed pump, turn the HOA
switch to the OFF position.
2. After the lead pump has been fixed, place the
lead pump HOA into the AUTO position and then
press the RESET button to reset the unit.
3. The pump returns to its operational state.
Conditions that cause the unit to cut out
Simplex and duplex units run when there is demand unless one of the following conditions
occurs:
Condition Description Resolution
Low city pressure The optional low-suction pressure
switch (1PS) trips.
The low suction condition resets automatically
when the city pressure returns to an acceptable
level.
Pump deadheading The high temperature cutout switch
trips.
The unit resets automatically when there is demand
by drawing cooler water through the unit and
across the temperature sensor. This cools the sensor
and causes it to change state and restart the pump.
For a manual purge run the unit in Hand mode for
about 5 seconds. Then put the unit back into Auto
mode for normal operation.
The smart relay control module
The AquaBoost CS duplex pumping package uses a smart relay for its control module. You
can adjust control settings via the front panel of the smart relay.
Commissioning, Startup, Operation, and Shutdown
AquaBoost CS and VS Pumping Packages Installation, Operation, and Maintenance Manual 33