MAT 2755917 - Caterpillar

machines that are equipped with Heating Ventilation Air Conditioning (HVAC) units need to have an adequate system for drainage in order to properly remove condensate from the HVAC system. Condensate collects on the coils as moisture is removed from the air during air conditioning operation. After the condensate has developed on the coil, the condensate will drip off the coil. In order to prevent any condensate from entering the enclosure for the operator, a drainage system that is maintained correctly is needed. Drainage of the condensate can be achieved in different ways. Some systems have a collection reservoir that is built into the case compartment that encloses the evaporator coil. The floor of the case slopes to the holes for drainage, and this allows condensate to drain away from the HVAC unit. Other systems incorporate a separate drain pan that is located under the coil, in the case compartment that is used to collect condensate. The drain pan is shaped in order to allow condensate to flow toward the holes for drainage and away from the HVAC unit. Whether integrated into the case design, or integrated through the use of a drain pan, the drain hoses and the valves are attached to the drain holes. Drainage hoses are commonly used to route the condensate around critical components on the machine, so that the water can be diverted to a proper point of exit below the machine. Drain valves are intended to prevent dust and debris from entering the HVAC unit. The location of the drainage unit may change the way that the condensate will be removed from the system. Some units will allow drainage to drain directly out of the case without the use of drain valves and hoses.