Pumps for BAC coil products are cast iron construction, bronze-fitted, with mechanical seal. They are manufactured to strict specifications to deliver the optimum water flow over the coil. This is important, as too little flow will allow dry areas to form promoting scaling and loss of capacity. Likewise, too much flow will block airflow with a resulting loss of capacity.
The pump is supplied with a bleed line and valve connected to the seal vent. This valve can be set to provide the proper bleed rate to minimize impurities in the basin water. Even if the basin bleed is accomplished by other methods, always leave the valve slightly cracked to prevent air binding in the pump.