Condensate Pumps & Reviews

April 8, 2011

Shop Condensate Pumps

Shop Condensate Pumps

Condensate pump units dispose of air conditioning and refrigeration condensation, and the waste water from drinking fountains, humidifiers, ice makers, beverage machines and gas furnaces. We also carry a large selection of pond pumps and fountain pumps. We are the largest online distributer of condensate pumps carrying more then 100 combination. We carry only major brands that have been tested for decades. Major brands include Beckett, Hartell, Little Giant and up and coming Diversitech. Check out our new line of waterfall pumps.

Condensate Pump Diagram

Construction and Operation

Condensate pumps mainly use electrically-powered motors to spin a impeller. They are often small and rated at a fraction of a horsepower, but in commercial applications they range in size up to larger horsepower and the electric motor is usually separated from the pump body by some form of mechanical coupling. Condensate pumps usually run intermittently and have a tank in which condensate can accumulate in a sump. Eventually, the accumulating liquid raises a float switch energizing the pump. The pump then runs until the level of liquid in the tank is substantially lowered. As liquid rises to the trigger point of the the pump is activated. If the liquid continues to rise (perhaps because the pump has failed or its discharge is blocked), the safety switch will be triggered. This safety switch may switch off the HVAC equipment (preventing the production of further condensate), trigger an alarm, or both. The in pan pumps may have no tank at all and are simply placed within a container such as the drip pan of a dehumidifier appliance.

The Pump Output

The output of small condensate pump is usually routed to a sewer, drain, or the outside through a pipe or plastic tubing. If the outlet of the line is at a higher level than the tank of the pump, a check valve is often fitted at the outlet of the pump so that liquid cannot flow backwards into the pump’s tank after an off cycle. If the outlet is below the tank level, siphonage usually naturally clears the output line of all liquid when the pump is de-energized. In cold freezing condions, it is important that condensate lines that are discharged outside be carefully designed so that no water can remain in the line to freeze up. You would use goose necks piping detail and possibly need some heat trace tape. Once frozen this would block the line from further operating. Condensate is not pure water. If it is being condensed from an air stream, it may have dust, microbes, or other contaminants in it. If it is condensed from furnace exhaust gases, it may be acidic, containing sulfuric acid or nitric acid as a result of sulfur and nitrogen dioxides in the exhaust gas stream which will need to be neutralized before draining out in mostly all towns. Steam and exhaust condensate is usually hotter then normal air condition condensate. These various factors may combine (along with local regulations) to require careful handling or even treatment of the condensate and condensate pumps used for these services must be appropriately designed.

Pumps Curve

Reading a Pump Curve

A pump curve tells you the flow performance of a pump relative to the head pressure. This is usually measured in gallons per hour or liters per hour, though sometimes condensate pump performance is rated in pints per hour. To read a pump curve, you must first examine the units of measurement used along each of the displayed axes. The pictured pump curve displays head pressure in Feet (along the left-side y-axis) and in Meters (along the right-side y-axis). Increased head pressure is indicated as you travel up the y-axis. The flow performance is indicated in gallons per hour (along the lower x-axis) and liters per hour (along the upper x-axis). This is an indication of the output flow of a pump. The pump curve is read by first determining the head pressure of the application in which the pump will be used. Once you’ve determined your head pressure, simply follow the head value you have selected from the y-axis horizontally to where it intersects with the pump curve line. From that point, move vertically to the flow measurement on the x-axis.

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