TM 10-4610-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
ULTRAFILTRATION MODULE
SOLENOID VALVE (V3A)
GENERAL
This work package lists the common malfunctions that you may find during the operation or maintenance of the
0.75-inch pilot-operated solenoid valve V3A on the Ultrafiltration (UF) module used on the Lightweight Water
Purifier (LWP). You should perform the tests/inspections and corrective action 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.
WARNING
When checking for voltage on an energized component, extreme care must be taken. Only qualified and
authorized electrician should maintain, troubleshoot, and operate energized equipment. Injury or death to
personnel may result.
MALFUNCTION
TEST/INSPECTION
CORRECTIVE ACTION
With the power on, check
If voltage is present preceed to
voltage across wire 31 and
the next step. If not skip to
3 for 120 VAC at the UF
malfunction 2.
junction box terminal block.
Remove connector at valve.
Replace connector or wiring to
Check continuity from wire
connector. If corrected voltage
31 , 3 and ground to terminal
should be present across wire 31
block TB1 in UF module
and 3 at the valve now.
junction box.
1. Valve will not open
Check and make sure that
Tighten coil mounting nut.
the coil is mounted properly
on top of the valve.
Check the coil resistance, it
Replace coil if resistance is not
should be between 108
within spec. (WP 0118 00)
132 OHMS (WP 0118 00)
Replace valve if still inoperable.
Test for opeartion.
If voltage is present at the
If the voltage is not avilable
connection on the control
module side, inspect the UF
at the UF junction box, test
for voltage across pin D and
module cable for continuity of
J (120 VAC) on the
wire 31 to pin D and, also, wire 3
to pin J. Replace cable if
connection (J6) at the
2. Valve will not open
control module.
necessary. Proceed if continuity
voltage is not available.
is present.
Inside the control panel,
check connections of wire
Tighten loose connection.
Replace or repair broken wires
31 from output 2 of PLC
and connections.
output card 1(OC1) to pin D.
0057 00-1
