TM 10-4610-310-14
UNIT MAINTENANCE
LIGHTWEIGHT WATER PURIFIER
TROUBLESHOOTING PROCEDURES
IMMERSION HEATER
GENERAL
This work package lists the common malfunctions that you may find during the operation or maintenance of the
2000-watt immersion heater in the chemical injection/cleaning module used on the Lightweight Water Purifier
(LWP). The heater element heats the solution in the cleaning tank. Electrical control for the immersion heater is a
two-position switch on the control module. 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
If present, the problem is in the heater:
With power on, test the control
check all the wires and connections for
panel for voltage at heater
1. Immersion Heater not
looseness, corrosion and continuity.
working - heater
junction (J9) across pins A and
Replace heater if not corrected.
C (120 VAC).
If voltage is not present proceed to next
step.
Test heater switch
With power off, check
connections of wire 37 on output
Tighten any loose connections. Repair
9 of the PLC from the PLC to the
and replace any broken or burnt wires.
heater control relay (CR1), and
Replace if continuity doesn't exists in
check for continuity of wire
the wire.
number 37 from the PLC to the
heater control relay.
With power on, check surge
protector (SP11) fault light.
2. Immersion Heater not
working control module
Tighten any loose connections. Repair
With power off, check continuity
and replace any broken or burnt wires.
on SP 11 between the terminals
Replace if continuity doesn't exists in
with wire 11.
the wire.
With power on, check surge
protector (SP20) fault light
With power off, check continuity
Tighten any loose connections. Repair
on (SP 20) between the
and replace any broken or burnt wires.
terminals with wire 37.
Replace if continuity doesn't exists in
the wire.
0077 00-1
