If a low-pressure boiler does not have an air vent, what is the recommended solution?

If a low-pressure boiler does not have an air vent, using the trycocks to vent the boiler is an appropriate solution. Trycocks are small valves located on the boiler, typically used for checking the water level and for venting air. When air remains trapped in the boiler, it can lead to inefficient operation and potential damage.

By using the trycocks, the operator can release any trapped air, allowing the boiler to function properly and ensuring the safety and efficiency of the system. This method is effective in managing pressure and maintaining the correct water level, which are critical for safe boiler operation. It's an established practice to ensure that all air is expelled from the system, enabling the boiler to function effectively without the need for additional equipment or modifications.

The other suggestions may not adequately address the issue of trapped air or could lead to complications. While manual pumps and increasing pressure might seem like potential solutions, they do not directly deal with the air problem, and installing a new air vent can be a more complex and time-consuming solution. Utilizing the trycocks offers a practical and immediate approach to resolving the issue with trapped air in the boiler.