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Testing LWCO Mode Systems
1.
Turn off thermostat and ensure boiler system has power.
2.
Verify that the S1 mode switch is in LWCO mode and any DBF and HAW delays are set.
3.
Lower the boiler water level until the LWCO indicates a low water condition.
4.
Verify that the EWF feeds the boiler. Be sure to verify that any DBF delays occurred prior to the EWF starting a feed cycle.
5.
When the LWCO indicates a normal water level, verify the EWF stops feeding the boiler. Be sure that any HAW delays
occur before the EWF completes the feed cycle.
6.
Return thermostat to its normal setting.
Testing and Setting Fixed Feed Systems
1.
Turn off thermostat and ensure boiler system has power.
2.
For boilers with probe style low water cutoffs, lower the boiler water level approximately ½” below the probe. Be sure to
verify that any DBF delays occurred prior to the EWF starting a feed cycle.
3.
For boilers with float style low water cutoffs, lower the water level in the boiler until approximately ¼” is visible in the gauge
glass. Be sure to verify that any DBF delays occurred prior to the EWF starting a feed cycle.
4.
While using a stopwatch or a watch with a second hand, press the manual feed button on the EWF and measure the time
it takes for the boiler fill to a normal water level. (Use the boiler manufacture’s recommended normal operating level –
typically the middle of the gauge glass).
5.
Determine the number of gallons that were required to fill the boiler to a normal water level: The EWF feeds 1 gallon each
minute. Round up to the nearest gallon.
6.
Set the S1 mode switch to FF (Fixed Feed).
7.
Set the S3 (Fixed Feed Settings) mode switch to the number of gallons determined in step 5.
8.
Return thermostat to its normal setting.
•••••
Fixed feed settings will always feed the amount of water set on switch S3, even if the LWCO indicates a
normal water level before the feed cycle completes.
•••••
Improper fixed feed settings could result in flooding and property damage could result.
