What is the main purpose of the LWCO when it is installed on a condensate tank/receiver?

The purpose of the Low Water Cutoff (LWCO) installed on a condensate tank or receiver primarily revolves around the protection of the boiler feed pump. The LWCO serves as a crucial safety device that monitors the water level within the condensate tank. If the water level drops below a predetermined threshold, indicating a potential risk of pump cavitation or damage, the LWCO activates and shuts down the feed pump. This action prevents the feed pump from running dry, which could lead to overheating and mechanical failure.

In the context of boiler operation, ensuring adequate water levels is critical for maintaining proper functionality and preventing system damage. The boiler feed pump relies on a steady supply of water to operate efficiently. Thus, the LWCO plays an integral role in safeguarding the system by ensuring that the feed pump only operates when there is sufficient water available.