Carrier MODULINE 37HS Application Data

Also see for MODULINE 37HS: Installation instructions and parts list Installation instructions Installation, Start-Up and Service Instructions

Contents

Carrier MODULINE 37HS Application Data Manual pdf 20 page image

Modulinet Selection (Analysis of Data) — The printout shown below presents an analysis of the preceding data.Heating — Heat must be provided in a building to offsetlosses through the perimeter walls, windows, and roof. Inthe interior spaces the heat gain from lights and people willin many cases be enough to cause a cooling load even inwinter.The two most commonly used heating systems are these:• Baseboard• Overhead airBaseboard has been used historically in the North becauseit is effective in overcoming the downdraft from windows,particularly with the large single pane windows used in thepast.Now, with improvements in the building thermal enve-lope due to better materials and construction methods, over-head air heating is a viable and attractive alternative.Overhead air heating, when properly applied, can handleall requirements except the severe cases in which the wall Uvalues and temperature differences are large.Overhead air heating is the method which will be con-sidered for these procedures.OVERHEAD AIR HEATING — Two basic forms of over-head heating are used with Moduline cooling systems:• Separate duct heating• Changeover Moduline heating/coolingSeparate Duct Heating — A simple type of overhead air heat-ing system for use with a Moduline cooling system consistsof a series of ceiling outlets, placed around the perimeter ofthe building close to the outside wall, which blow warm airoutward and/or downward to floor level. The outlets are con-nected by a simple duct system to an electric (or hot water)heating-only fan coil unit located above the ceiling. (SeeFig. 5.) A minimum of one fan coil unit per exposure is usedfor each story of the building. The fan coil unit draws airfrom the ceiling plenum and distributes it to the building pe-rimeter by means of a separate duct system. This type ofheating system operates at constant volume.The separate duct heating approach allows heat to blanketthe outside wall, eliminating the transmission of heat throughthe outside wall and permits the Moduline cooling units tobe located in the best arrangement for cooling distribution.Control interlock between separate system heating and Modu-line cooling is outlined in the Control Applications section,on page 44.The 35BD heating slot boot diffuser (Fig. 6) is specifi-cally designed for this heating approach and will provide ex-cellent distribution of the hot air necessary to offset the load.20