TM 10-4810-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
CHEMICAL INJECTION PUMP (COAGULANT)
Chemical Injection Pump (Coagulant)
The table lists the common malfunctions that you may find during the operation or maintenance of the coagulant
chemical injection pump assembly P6 in the chemical injection/cleaning module used in Lightweight Water
Purifier (LWP). You should perform the tests/inspections and corrective actions in the order listed.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
MALFUNCTION
TEST / INSPECTION
CORRECTIVE ACTION
Ensure that the raw water pump is in
Turn the raw water on. Ensure that it
operation.
is operating properly.
With power off, check wires 48, 3, and
ground for loose connections and
Tighten any loose connections.
damage from the chemical module
Repair and replace any broken wires.
junction box to the injection pump.
If present and the speed and stroke
controls are not at zero but the pump
With power on, check for voltage across
is not running, replace the pump. If
wire 48 and 3 at the chemical module
voltage is not present, proceed to the
junction box. (120 VAC)
next step.
Inspect chemical pump switch (SW10)
1. Pump malfunctions
With power off, check connections of wire
Tighten any loose connections.
48 from the switch to the chemical
module junction box, and check for
Repair and replace any broken or
burnt wires. Replace if continuity
doesn't exists in the wire.
switch to the chemical module junction
box.
With power off, place switch (SW10) in
Tighten any loose connections.
Repair and replace any broken or
terminal with wire 38 and the terminal with
burnt wires. Replace if continuity
wire 48.
doesn't exists in the wire.
Check PLC
0075 00-1