Low-water fuel cutoff

1. Each automatically fired hot water heating boiler must have an automatic low-water fuel cutoff that has been designed for hot water service and which can be tested without draining the system or the boiler. It must be so located as to automatically cut off the fuel supply prior to the surface of the water falling below the lowest safe water level as established by the boiler manufacturer. 2. A coil-type or watertube boiler requiring forced circulation to prevent overheating of the coils or tubes must have a flow-sensing device installed in the boiler or piping in lieu of the required low-water fuel cutoff that will cut off the fuel supply when the circulation flow is interrupted. Functioning of the low-water fuel cutoff due to a low-water condition must cause safety shutdown and lockout. Where a reset device is separate from the low-water fuel cutoff, a means must be provided to indicate actuation of the low-water fuel cutoff. The manual reset may be the instantaneous type or may include a time delay of not more than three minutes after the fuel has been cut off. 3. Low-water fuel cutoff requirements for steam boilers are addressed by section 33.1-14-03-07.