Wall mounted air conditioning units will produce water when operated in cooling mode, this is a result of the warmer air room air being sucked in at the indoor unit and passing over the colder evaporator coils of the indoor unit. All wall mounted units have condensate drain connections either side of the drip tray that is built into the indoor unit are not required if these drain connections can be connected to the drain hose and then routed via a gravity route to a suitable drain point. However if the condensate drain route goes upwards, for instance the route taken may be via trunking with the condensate drain going upwards in to a ceilings void before being attached to a suitable drain point, then a condensate pump will be required as we all know water cannot run up hill.
There are a number of condensate pump manufactures with probably the best known being Aspen and Charles Austen. The Aspen ranges have a number of pump types including the mini lime series which are the most common pump type fitted. All Aspen condensate pumps operate on the principle of a piston pump built into the actual condensate pump to physically pump away the water. This is generally activated by a signal being passed to the pump itself via a float chamber that fills up with water. Charles Austen the other condensate pump maker manufacturers the Blue Diamond range of pumps that we feature. This range of condensate pumps operate via a different principle. The smallest and most popular pump is the Mini Blue and Maxi Blue range. These pumps operate via a rotary cam the presses on a flexible tube that creates a vacuum and sucks the water up from the drip tray on the indoor unit. Both makes are good reliable products, the Aspen pumps being a bit cheaper to buy. However because the Blue Diamond condensate pumps do not use a piston type arrangement to pump the water, they tend to be quieter and are not prone to noise which sometimes occurs to the piston style of condensate pumps as they become older.