Boiler Feed Water Pumps & Condensate Pumps | Boiler Supplies
Replacement Condensate Pump " AirFlow"
Direct Replacement for Hoffman Condensate return Tanks and most Skidmore, Shipco,Federal,Sterling Units with (5" x 2-3/4" Flange)
*** Direct Replacement for Hoffman Condensate Units and most Skidmore and Shipco Units with (5" x 2-3/4" Flange) ***
*** Condensate and Boiler Feed Replacement Pumps (To fit Weinman, Aurora, Federal, Shipco, Chicago, Dunham-Bush & ITT Domestic...Guaranteed to fit to any unit with our flange kit ***
We will also need to verify your flow. If you have a different unit or flange size use our printable pump form below to fill out your information and fax back to us to quote. **Items to be returned must be approved by Power Plus International, and may be subjected to a restocking fee.**
Condensate pumps as used in hydronic systems are usually electrically powered centrifugal pumps. As used in homes and individual heat exchangers, they are often small and rated at a fraction of a horsepower, but in commercial applications they range in size up to many horsepower and the electric motor is usually separated from the pump body by some form of mechanical coupling. Large industrial pumps may also serve as the feedwater pump for returning the condensate under pressure to a boiler.
Condensate pumps usually run intermittently and have a tank in which condensate can accumulate. 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. Some pumps contain a two-stage switch. As liquid rises to the trigger point of the first stage, the pump is activated. If the liquid continues to rise (perhaps because the pump has failed or its discharge is blocked), the second stage will be triggered. This stage may switch off the HVAC equipment (preventing the production of further condensate), trigger an alarm, or both.
Some systems may include two pumps to service the tank. In this case, the two pumps often alternate operation, and a two-stage switch serves to energize the on-duty pump at the first stage and then energize the remaining pump at the second stage. This second stage action is in addition to any triggering of other system changes as noted for a single pump installation. In this way pump runtime is shared between the two, and a backup pump is provided in case one pump fails to function as designed.
Feedwater pumps range in size up to many horsepower and the electric motor is usually separated from the pump body by some form of mechanical coupling. Large industrial condensate pumps may also serve as the feedwater pump. In either case, to force the water into the boiler, the pump must generate sufficient pressure to overcome the steam pressure developed by the boiler. This is usually accomplished through the use of a centrifugal pump. Another common form of feedwater pumps run constantly and are provided with a minimum flow device to stop overpressuring the pump on low flows.The minimum flow usually returns to the tank or deaerator.
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