User Guide

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CL
Installation & Service Manual
How to Test
Shut off fuel supply. Close shut-off valves in
system supply and return piping located in near
boiler piping above LWCO as shown in Figure
A1. Open drain valve to lower water level until
water is below the LWCO probe. It may be
necessary to open relief valve seat to allow air
into system for the water to drain, close drain
valve and relief valve once completed. Generate
a boiler demand by turning up thermostat. Boiler
should not attempt to operate. Open fill valve to
increase the water level by filling the system. It
may be necessary to open relief valve to allow air
to escape during filling process. The boiler should
attempt to operate once the water level is above
the LWCO.
Appendix A Aftermarket Low Water Cut Off (LWCO) (continued)