Install Instructions

4. If the LWCO fails to function normally, perform the following
steps to verify the proper installation:
a. Make sure the water level covers the probe.
b. Verify ALL LWCO wiring and that probe is secured with
locknut.
c. If Tefl on tape was used on the threads of the brass bushing
for the probe, remove the tape and install with a small amount
of pipe sealant.
d. Water treatment may be required.
5. If the "STATUS" LED blinks RED, the safety circuits in the
LWCO have detected a failure in the control and the LWCO
will remain in a low water condition. To clear any temporary
condition:
a. Remove power to the LWCO for 30 seconds.
b. Re-connect power to the LWCO.
c. If the "STATUS" LED continues to blink RED, the safety
circuits in the LWCO have found a failure that cannot be
corrected. The control must be replaced.
6. If water covers the probe and the "STATUS" LED illuminates
RED, indicating a low water condition, the probe may be coated
with a fl ux or oils, (the "SERVICE" LED will illuminate AMBER).
Add a cleaning solution, (water and trisodium phosphate or
consult the boiler manufacturer), to the system. Heat and
circulate this solution for at least one hour before draining and
completely fl ushing the system with clean water. Remove the
probe and thoroughly wipe it with a clean rag. Refi ll the system
and test for proper function.
Cleaning, Maintenance, and Replacement:
Test the operation of the LWCO annually, or more frequently,
by pressing the "TEST" button. The "STATUS" LED should turn
RED and the boiler should shut down. Probe must be inspected
every 5 years (or sooner if "SERVICE" LED turns on) for scale
build-up or coating. Clean all oils, fl uxes, and scale from probe
with a clean rag.
Probe should be replaced every 10 years. Replace more often
if used in areas where heavy water treatment is required, when
cleaning is needed more frequent than annually, and/or boiler
demands for make-up water are high.
The control unit should be replaced every 15 years. In areas of
high humidity and heavy dust or other airborne contaminants more
frequent replacement may be required.
Test For Proper Function:
1. DO NOT fi ll boiler. Set thermostat to lowest possible setting
and turn on electric power to the boiler. On initial start-up, the
LWCO indicates low water condition, which indicates proper
function. The "STATUS" LED on the control unit illuminates
RED. The burner should not operate without water in the
system. During the testing process, the "SERVICE" LED
should not be illuminated.
2. Fill boiler with water. Once water covers the probe the "STATUS"
LED on the control unit turns from RED to GREEN. You must
press the reset button on manual reset models, (LFM models)
before the control will reset.
3. Set the thermostat to call for heat, and verify that the burner
ignites.
4. Press and hold the test switch while observing the LED's on
the control unit. The "STATUS" LED illuminates RED and the
burner should turn off.
5. Testing the burner circuit wiring:
a. With the burner afl ame, press the test switch and observe
the burner.
b. The burner should cutoff after the test switch is held.
This indicates the burner circuit is wired properly. When
test switch is released, the burner ignites and continues
functioning (provided water covers the probe). You must
press the reset button on manual reset models (FM models)
before the control will reset. If burner fails to cutoff or relight,
see the Troubleshooting section for details.
6. Set the thermostat to its normal setting.
Once correct operation of the LWCO has been tested, test ALL
other safety, limit and control devices before fi nalizing system
operation.
Troubleshooting:
1. If the "SERVICE" LED blinks AMBER and the "LOW WATER"
LED illuminates RED, the LFA has detected excessive foaming
in the boiler, resulting in a low water condition. Some foaming
is common in certain boilers. If foaming occurs with priming
or surging, (usually visible in the gauge glass), this indicates
a problem, and that the boiler and piping may be dirty. Refer
to the boiler manufacturer's recommendations for cleaning the
boiler and piping.
2. If the "SERVICE" LED illuminates AMBER, the probe signal is
weak and needs to be cleaned. Scale, oils, or fl uxes coating
the probe's electrode are insulating the electrode from the
LWCO's electrical signals. Remove the probe and thoroughly
wipe it with a clean rag. Refi ll the system and test for proper
function.
3. If LWCO fails to cutoff burner during testing:
a. Drain the water level in the boiler below the probe.
b. Turn off electrical power to the boiler and the LWCO.
c. Using an Ohmmeter, measure the resistance between the
probe's brass bushing and the nut connection to the probe
on the LWCO, (see Fig. 3 for location). If the resistance
is less than 5,000 Ohms, then the probe is shorted. The
shorted probe must be replaced.
PROBE CLEANING
FIG. 10
TEFLON SLEEVE INSULATOR
(Be careful not to damage during cleaning)
DWG #1108-8