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Figure 7-27 The air handler is powered through a disconnect switch seen on the wall at the left of the opening. This air handler has a removable filter between the air intake plenum at the right and the air intake. The air handler is fully accessible by removing a panel not shown in the photo. This air handler could also be configured for vertical mounting by rotating the orientation of the chilled water “A-coil” within the cabinet. The cooling ratings of fan-coils and air handlers are typically divided into two categories: sensible cooling and total cooling. Sensible cooling is the ability of the air handler to lower the temperature of air passing through it at a specific combination of entering water temperature, entering air temperature, water flow rate and airflow rate. Latent cooling is the ability of the unit to remove moisture from the airstream passing through it. The latent cooling capacity of an air handler or fan-coil is found by subtracting sensible cooling capacity from total cooling capacity. Cooling load calculations develop values for sensible and latent cooling capacity. Designers need to reasonably match the ratio of sensible-to-total cooling capacity of an air handler to the ratio of sensible cooling load-to-total cooling load. The latter would be determined through cooling load calculations. PREVENTING UNWANTED CONDENSATION Perhaps the most critical detail on chilled water cooling systems is preventing condensation on piping and other components conveying chilled water. If surrounding air comes in contact with chilled surfaces that are below the dewpoint of that air, condensation will occur. This will cause superficial oxidation of any ferrous metal components, even those with a painted or coated surface, as seen in Figure 7-29. High wall cassettes draw in air at the top of the unit and discharge it through a slot at the front base. Most have an oscillating damper that opens when the unit is operating and closes when it is off. The movement of the damper is designed to mix discharge air with room air. Most high wall cassettes are operated by a handheld remote. Internal contacts within the cassette allow it to turn on a circulator or valve for either heating or cooling mode. Air handlers are designed to be mounted in utility spaces and connected to ducting systems. Many modern air handlers can be mounted in either vertical or horizontal orientations. Figure 7-28 shows an example of the latter. Figure 7-28 This air handler has a nominal cooling rating of 3 tons (36,000 Btu/hr). It is supplied with chilled water from a heat pump by a set of 3/4” pre-insulated PEX tubes. The condensate drain with trap is seen in the lower front of the unit. The condensate trap prevents the air handler from sucking in air through the drainage pipe. This trap is also equipped with an overflow switch that turns off the blower if a blockage within the trap prevents condensate from properly draining. Notice that the 3/4” PVC drain pipe is sloped downward for gravity drainage. This air handler is also mounted above a secondary drain pan, which would catch any water leaking from the primary drain pan. 70PDF Image | Heat Pump Systems 2020
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