The GOLD series of air handling units with revolutionizing control system.Read more about GOLD One Piece Units COMPACT air handling units and room units.Read more about COMPACT One Piece Units Space-efficient AHUs without control system.Read more about SILVER C One Piece Units Modular air handling units customized for your needsRead more about Swegon SILVER M Modular Air Handling UnitsMCM's preconditioned air equipment for central air conditioning installations. Provides cold air (25°F LAT) to aircraft PLC control to monitor the ambient and discharge temperatures. Air handling unit is fully self- contained and can accommodate a wide range of aircraft. VFD controller optimizes air flow.When good condensate drains go bad, property damage may result. Central air conditioners produce something other than cool comfort: water, lots of it. Because dry air holds less heat energy, humidity extraction is a critical part of an efficient air conditioning process. When the air conditioner blower pulls warm household air through the frigid passages of the evaporator coil, the cooling effect causes water vapor to condense out of the air rapidly.

Condensation drips down into a collector pan under the coil and is conveyed through a drain line to a household sewer connection. Things that might go wrong in the condensate drain system include damaging leaks, bad air quality, toxic mold growth, and even a complete air conditioner shutdown. Leakage And Overflows The wet, warm environment of a condensate collector beneath a central air conditioner evaporator coil is a perfect algae breeding ground. This biological growth may migrate into the condensate drain line or the drain trap and form a blockage. Condensate overflow due to a blocked drain may be caught by an overflow pan beneath the air handler, but if the overflow pan is missing, or has cracked or developed a hole, or if the overflow pan’s drain line is plumbed to the same primary drain line that is clogged, water leakage will ensue. Property damage from unseen condensate leakage can be extensive and expensive by the time a leak is finally noted by occupants. Drain Trap A central air system routes condensation through a U-shaped trap located in the drain line just outside the air handler.

It's similar to the trap under your kitchen or bathroom sink; water in the trap prevents sewer gases originating where the condensate drain pipe terminates from infiltrating the air handler. why does a central ac unit freeze upIn some conditions, such as during a long season of non-operation or when a gravity-fed drain line is not installed with the proper incline, the condensate drain trap may dry out and allow sewer gases to pass through the line. what does 2 ton ac unit meanUnexplained noxious odors emitted from air conditioner supply vents in the home are the primary symptom of a dry condensate drain trap. cost to replace outside hvac unitMold Growth Mold in the condensate drain system feeds off tiny airborne organic particulates sucked in through the return ducts and produces millions of mold spores.

A mold colony is perfectly positioned to disperse spores into airflow in the supply ducts, and to infect the breathing air throughout your home. Allergic symptoms and other respiratory distress may result in susceptible individuals. In addition, mold growth originating in the condensate drain collector frequently expands into the evaporator coil, too, obstructing narrow air passages and strangling system airflow. System Shutdown Because of the potential of severe property damage from unseen leaks, many condensate drain systems incorporate an overflow sensor. When a clogged condensate drain causes a backup that reaches overflow stage, the sensor cuts off power to the system. The coil and collector are sealed inside the air handler and generally not accessible for a do-it-yourself project. Until an HVAC technician can arrive to open the air handler, unblock the drain line, and clear the pan, the air conditioner will be unusable. References Inspectapedia: A/C Or Heat Pump System Condensate Drains, Piping, PumpsAmerican Society Of Home Inspectors: Let's Concentrate On Condensate Photo Credits Jupiterimages/Stockbyte/Getty Images Suggest a Correction

Sample Plans and Sections partitions to divide the underfloor plenum into separate zones (e.g., interior and perimeter) is comparable to the conventional approach to zoning with overhead air distribution systems. It enables supply air of different temperatures or volumes to be delivered to different spaces within the overallDiffusers within the same zone typically receive supply air of similar In addition to being either partitioned or open-plan, plenums can operate asPressurized plenums have a small positive static pressure applied, created by a central fan in the air-handling unit (AHU), that drives the air up through the diffusers to the lower pressure surroundings of the conditioned office space. Standard methods of control at the central AHU are used to maintain the desired overall supply volume and temperature under thermostatic control, and a pre-set pressure level, at which the diffusersThe low operational pressure of underfloor

plenums, compared to ceiling-based systems, potentially reduces fan energy consumption and thus operating costs. In zero-pressure plenums, small local fan units draw air from the underfloor plenum and deliver it to the space through floor diffusers or outlets located in the furniture or partitions. Compared to passive diffusers, used with pressurized-plenum systems, fan-powered outlets are generally more easily and effectively controlled by nearby occupants. However, for reasons of reduced maintenance, installation and equipment costs, pressurized-plenums are the most commonly installed systems at present. Air is typically extracted from the room through return grilles located at ceiling level using a conventional ceiling-return plenum. If no plenum is present, air can be returned through high side-wall grilles. The return air is then ducted back to the AHU where it is either exhausted to the outdoors, or filtered and dehumidified as necessary in the AHU before mixing with the supply

air and re-entering the underfloor plenum. In some configurations, a portion of the return air is re-circulated directly back into the underfloor plenum where it is thoroughly mixed with incoming primary air from the AHU. Some portion of each floor in a typical building will be devoted to accommodating the mechanical plant risers, equipment (e.g. the AHU) and circulation shafts such as stairs and elevators. In the plans indicated this area is placed as centralized at the core of the floor plate, however this is not always the case. Other possibilities include a distributed or perimeter service area, for example. Shown below, in plan view and corresponding floor-to-floor section, are threeThe first two examples represent earlier UFAD designs in which the more extensive use of ductwork and partitions within the plenum was a more common practice.  It is now recommended to minimize to the extent possible, the amount of installed ducts, air highways,

and other HVAC-related components in the underfloor plenum so that it can serve as a highly flexible and accessible service plenum.  For any particular building project, the most suitable configuration will be determined by a number of parameters unique to that project - such as floor plate area, site-specific climate, or anticipated HVAC loads and their distribution, for example. this reason it is important that decisions as to the plenum configuration be made with respect to the project's characteristics. In addition, please note that the drawings shown below represent only three of any number of possible 1. Multi-zoned with extensive perimeter ductwork This approach has been used in many existing underfloor installations and uses a similar control strategy to overhead variable-air-volume (VAV) systems. Conditioned air is supplied to interior and perimeter zones through an underfloor supply duct encircling the interior/perimeter boundary.

to defining the interior and perimeter, underfloor sheet metal partitioning is used to create smaller zones around the perimeter of the floor plan, as well as other zones as necessary. Using a conventional variable-air-volume (VAV) control strategy, air flow to each zone is controlled by VAV terminal units in response to zone thermostats. Supply air is delivered to all zones through passive (swirl or other non fan-powered) diffusers. Nearby occupants have some amount of control over these floor diffusers. In this example, heating in the perimeter zones is accomplished with reheat coils (electric or water-based) inThe large amount of perimeter ductwork may restrict the flexibility to reconfigure plenum services in the future. 2. Multi-zoned, limited perimeter ductwork This approach also uses underfloor partitioning to divide interior andHowever, the amount of underfloor ductwork is reduced by relying on a single feeder duct to supply conditioned air to each of the four

large perimeter zones, as shown. are used to deliver a constant volume, variable temperature supply of air toAir flow from individual diffusers in the interior zone may be controlled by nearby occupants. Air flow to the perimeter zones is delivered through linear grills and controlled by VAV terminal units in response to zone thermostats. Perimeter finned tube heating coils, located directly under the linear grills in the underfloor plenum, are used during the heating mode. Conditioned air from a central source is distributed to diffusers across the entire floor area through a single, undivided pressurized plenum. methods of control at the central AHU are used to maintain the static pressure in the plenum at a constant level. Supply air is delivered to the interior zone through passive diffusers that can be controlled by nearby occupants. cooling mode in the perimeter zone, supply volume through the diffusers is automatically controlled in response to zone thermostats.