HVAC pumps are used to pump out condensed water in a HVAC cooling or heating system. They are also used in air conditioning and refrigeration systems to pump out cool or hot air and refrigerated air as well.
HVAC pumps are basically centrifugal pumps powered by electricity. These pumps do not run continuously, but intermittently while the condensed vapour accumulates in a tank inside the pump. Usually HVAC pumps contain a switch that is triggered when the level of accumulated liquid in the tank rises past it. Once the switch is triggered, the pump starts pumping until the liquid level reduces again to an acceptable level.
Different types of HVAC pumps require different features to function specifically in the system they are best suited. The in-line circulators are a centrifugal HVAC pump made with castiron suitable for high pressure systems. The shaft of this HVAC pump is made from steel but has a copper sleeve that is usually lubricated with oil. The motor of the in-line circulators are mounted to the pump casing.
The compact in-line circulator is another type of HVAC pump. This one is also a centrifugal type of pump. The compact in-line circulator has mechanical seals and is suitable for medium pressure systems. The motor of this HVAC pump is also mounted directly on the pump casing.
Another type of HVAC pump is the close-coupled end suction pump. This HVAC pump is also made with a cast iron casing, has mechanical seals and its motor is on the pump casing.
There is also the flexible end coupled suction pump, which is base mounted, has a split case design with replaceable earrings encased in bronze.
All the types of HVAC pump can be broadly put into two groups which are, the in-line pump and the closed coupled pump. The in-line pump is also referred to as the booster pump, and has its suction and discharge arranged in a straight line. This arrangement makes this HVAC pump lightweight. The HVAC pumps classified under this group are cost effective and easy to install.
The closed coupled group has its impellers mounted directly on the motor shaft, with an end suction connection. Closed coupled HVAC pumps are also cost effective and do not require much to install and use.
People often mistake HVAC pumps for heat pumps, but the truth is that while they both serve the same purpose in cooling mode, heat pumps pump out heat while HVAC pumps just pump out the condensed water in your air conditioning or ventilation system.
HVAC pumps do not absorb heat from the outside in, but heat pumps can heat up your home in cold weather by absorbing hot air from outside and pumping it into your ventilation systems.
Every normal ventilation or air conditioning system requires a HVAC pump to function efficiently. If the condensate, that is the condensed water is allowed to stay in the system without being pumped out, it could spoil the whole ventilation system and cause your air conditioner to function below par.
HVAC pumps could also be single-stage end-suction, multi-stage end-suction, single-stage split-case or multi-stage split-case. Even though these are centrifugal HVAC pumps, they differ in certain functions and appearance as well.