What is the purpose of a condensate pump in an air conditioning system?

The purpose of a condensate pump in an air conditioning system is to automatically remove and discharge condensate water that accumulates from the cooling coil. As air passes over the cooling coil, moisture in the air condenses on the cold surface. This condensate water collects in a drain pan beneath the coil. If the drain pan is located below the level of the nearest drain, gravity cannot be used to remove the condensate. In these cases, a condensate pump is used to lift the water to a higher elevation so it can drain away. The condensate pump typically consists of a small reservoir, a pump, and a float switch. As the water level in the reservoir rises, the float switch activates the pump, which then pumps the water out of the reservoir and into the drain line. The pump continues to run until the water level drops below a certain point, at which time the float switch deactivates the pump. Without a condensate pump, the drain pan would overflow, potentially causing water damage to the building. For example, in a rooftop air conditioning unit, the condensate pump is essential to lift the water to the level of the roof drain. Regular maintenance of the condensate pump is important to ensure that it is functioning properly and that the drain line is clear of obstructions.