When air conditioning systems operate in hot summer weather, moisture is wrung out of the air in the form of liquid
condensate. Most of today’s cooling systems do a spectacular job of dehumidification, pulling upwards of 20 quarts of water
out of the air per hour. In most systems, if situated in the attic or basement, this water will flow by gravity either to an
outside roof gutter or nearby sink or drain. Many systems have condensate drains that are either below the level of nearby
plumbing or are so far away as to make gravity drainage impractical. Here, we use a small device called a condensate removal
pump. Usually about the size of a shoe box, this device consists of a water reservoir, a float switch and a small pump.
As condensed water trickles into the pump reservoir, the float switch rises until it turns the pump on. The pump then
discharges the water, usually through a small plastic tube, to a sink, drain line or even the exterior of the house. These
pumps should be tested each year. A proper test will involve pouring significant amounts of water into the pump and making
sure the switch activates the pump and the pump properly evacuates the water through the tubing. At this time, the tubing
should also be examined for clogs, kinks or breaks. When a condensate pump fails, those 20 quarts of water per hour will
drain by gravity right to the floor, or in the case of an overhead air conditioning system, through an upstairs ceiling as it
escapes from your attic.Today, often, these pumps can be equipped with safety switches which will turn your system off in the
event the reservoir fills to the top and the pump fails to operate.
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