Atmospheric hot water boilers are characterized by their safety and low explosion risk. This is mainly reason that the top of the atmospheric boiler is directly connected to the atmosphere and cannot withstand the static 

pressure of the heating system's water column. this boiler can also be referred to as “open hot water tanks.”

Although atmospheric hot water boilers have relatively high safety, many details must be observed during operation.

Precautions:

1. System Water

The heating system is equipped with an elevated bearing tank positioned at the system's highest point. The rainwater system connects to the return pipe, allowing tap water pressure to fill the system. Simultaneously, 

ensure normal system drainage enables water replenishment. After the elevated tank overflows, initiate pump circulation. Continue replenishing water until the system is fully charged.

2. Pre-Operation Check of Start-Up Valves

• First, open the boiler inlet and outlet valves. Start the circulation pump to initiate system flow and verify the sensitivity of the automatic shut-off valve. Afterward, stop the circulation pump for 1-2 hours while

• monitoring the boiler water level.

• If the water level remains stable, the automatic shut-off valve is sealing properly. If the water level rises rapidly after pump shutdown, the valve is leaking and requires immediate repair or replacement.

• When the automatic shut-off valve malfunctions or leaks severely, ignition becomes impossible.

3. Boiler Shutdown

For atmospheric hot water boilers, shutdown procedures for combustion equipment follow the same steps as pressure boilers, except without the requirement that boiler water temperature must be below 50°C. If severe 

water hammer occurs due to vaporization during shutdown, replenish boiler water and use the overflow pipe to reduce furnace temperature, thereby mitigating vaporization.