Instruction manual

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A 24 VAC LWCO is used primarily for gas red
boilers where a 24 volt control circuit exists within the
boiler. However, a 24 VAC LWCO can only be used
if the boiler manufacturer has provided piping and
wiring connections and instructions to allow for this
application.
APPENDIX A - LOW WATER CUT OFF (LWCO) (continued)
How to Test
Shut off fuel supply. Lower water level until water
level is BELOW the LWCO. Generate a boiler demand
by turning up thermostat. Boiler should not attempt to
operate. Increase the water level by lling the system.
The boiler should attempt to operate once the water
level is above the LWCO.