How Does a Condensate Pump Work?
A condensate pump consists of three major parts: the reservoir, float, and pump. They all work together to collect and drain the condensate.
As the collected water rises within the reservoir, it lifts the float. The float in turn activates the pump to siphon the water through a drain line and out to the home’s exterior or to another drain. As the water is drained, the float descends and automatically turns off the pump.
Most condensate pumps use 110 volts. They are often plugged into a standard wall outlet located close to the AC unit.
The reservoir tank on a traditional pump typically ranges from 0.5 to 1 gallon. Some smaller pumps may not have a reservoir. Instead, they are placed directly on the drain pan of the AC to pump out the collected water. There are also compact pumps designed specifically for use with mini splits that take up much less space.
Why is a Condensate Pump Important?
- It ensures proper drainage of condensate.
- Drainage is critical to the continued operation of your AC system. A frozen evaporator coil or blocked compressor due to excess condensate is the common cause of many AC problems.
- The pump prevents water from dripping onto the floor or in the attic and causing water damage.
How to Choose a Condensate Pump for your AC or Mini Split
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Choose the right type for your AC
There are condensate pumps that are used for specific types of air conditioning systems. Identify what type of AC you have, such as ducted or split, and start from there.
Also consider the specific model. Floor, wall-mounted, and ceiling cassette units may have their own types of condensate pumps.
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Determine the cooling capacity of your AC
This is needed to estimate the amount of condensate discharged per hour. Larger AC units typically produce more condensate, requiring pumps with bigger discharge capacities.
Consult your owner’s manual or AC specs to determine the cooling capacity.
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Local climate
The amount of condensate discharged can differ significantly between dry and humid climates. The water generated in humid areas or tropical zones can be double that of drier regions. Homes located in humid areas may need a high performance pump designed for humid climate conditions.
Other Features to Look for in a Condensate Pump
Installation preference
A condensate pump can be mounted in many different ways. It can be installed next to the unit, below, inside, or remotely above the AC.
For indoor settings, you may have a specific location preference to hide the unit, make it more accessible for cleaning, or have an obstruction.
Two-stage switch
Some condensate pumps feature a two-stage switch to guard against overflow. As the tank gets filled to the first stage, the pump is activated to drain the tank.
If the condensate level continues to rise because the pump has failed or the discharge is blocked, a second stage is engaged. The pump then either shuts off automatically or triggers an alarm.
Noise level
Like all pumps, condensate pumps emit noise during operation. This is measured in decibels, or db(A). The lower the number, the less noise it generates during use.
