TM 10-4610-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
ULTRAFILTRATION MODULE
LEVEL SWITCH
GENERAL
This work package lists the common malfunctions that you may find during the operation or maintenance of the
Lightweight Water Purifier (LWP) 30-watt level switch on the Ultrafiltration (UF) module. You should perform the
tests/inspections and corrective action in the order listed. The level switch mounts in a T-fitting on the filtrate to
tank piping to monitor the water level.
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
1. Engine is not shutting down
While unit is running, Remove
If the unit shuts down, replace vacuum
automatically under low level
the vacuum relief valve and
relief (WP 0090 00)
condition
shutdown the unit (WP 0090 00)
Check connections for wires 2
Tighten or connect wiring if loose.
and 4 in the UF module junction
box (terminal block - TB1) and
on the level switch.
With power off, Inspect for
Replace or repair wiring
continuity between wire 2 and 4.
With power on, test for voltage
If present, replace switch if not proceed.
output (120 V) at wires 2 and 4
at the UF junction box
With power on, test for voltage
If present replace UF module cable, if
output (120 V) across pin A and
not proceed
B of junction (J6) on the control
module
With power off, perform
Replace SP 15 if faulty (WP 0102 00)
continuity check of wires 2
across surge protector SP 15
inside the control panel.
2.Engine shuts down undirected
Remove Inspect the switch for
Remove any deposits and ensure the
low level switch
damage or cleanliness
float is free to move (WP 0090 00)
Remove the low level switch
The continuity should not be presented
from the holder and check for
when the float is down. Replace if
continuity across the switch
faulty. (WP 0090 00)
between wire 2 and 4.
3. low level pilot light is blinking
Check the level in the UF filtrate
Allow the tank to fill up higher than the
tank
low level switch
Filtrate tank level dropping
Troubleshoot filtrate tank (WP 0028 00)
0062 00-1
