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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers

39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers
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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 1

Product Data 39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers Nominal 400 to 8,500 cfm The 39S series air handlers offer: • Horizontal and vertical draw-thru arrangements for heating, cooling, ventilation, and VAV (variable air volume) applications • Small footprint, which assures rigging ease and reduced space requirements Features/Benefits Delivering the air handler components for many stringent specification requirements, the 39S series air handlers are compact and fully assembled; they combine versatility with economical, dependable performance. Dependable performance a39-4062 Copyright 2008 Carrier Corporation Galvanized steel panels ensure structural integrity under all operating conditions. Double-walled hinged access doors on outdoor units also enhance structural stability and provide fast, easy access. Optional stainless steel drain pan controls condensate. Internally mounted motors and drives are installed and aligned at the factory. Because they are contained in a cooled, filtered, dehumidified airstream, motor bearings and belts have less wear and require less servicing. Internal mounting also reduces installation time, shipping damage, and vandalism. Form 39S-3PD

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 2

Features/Benefits (cont) Precision-balanced fan wheels limit vibration and eliminate abnormal stress on bearings and other components. Fan bearings are rated at 200,000 hours average life. Mixing boxes and filter mixing boxes have parallel blades to provide thorough, efficient air mixing. Dampers are sectioned to prevent excess blade warping and ensure tight closure. Economy Coil flexibility Factory assembled, prealigned drives and fans eliminate field installation expense, saving money. Small envelope size is easy to rig and ensures economical use of building space. Quicker, easier...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 3

Model number nomenclature Due to the complexity of the 39S model number, use the “verify model number” function in the AHUBuilder® software for a detailed model explanation. LEGEND TXV — Thermostatic Expansion Valve *Contact your local Carrier representative for a list of available unit arrangements. †Contact your local Carrier representative for a list of factoryinstalled options. **Unit shall be factory wired. Field must switch transformer tap (if provided) to 208v. a39-4120 3

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 4

Factory-installed options ITEM MERV 7, 2 in. Pleated Filter Throwaway Filters for Face, Bypass, and Filter Sections Indoor Air Quality (IAQ) Insulation Closed Cell Insulation Double Wall Insulation Motor Start/Stop Station* Plastic Drain Pan† Stainless Steel Drain Pan** Galvanized Steel Drain Pan Std — X — — — Std/— — Std/X — PRODUCT TYPE SV SM X X SR X X — — — Std X X X Std/— Std/X — Std X X X Std/X Std/X Std/X X X X X X — — X Std SH X X — X Std LEGEND Standard Item Optional Item Unavailable Item Standard or Unavailable Item Depending on Unit Size Standard or Optional Item Depending on...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 5

Application data Vertical (indoor unit only) Central station air handler The central station air handler is a heating, ventilating, or air-conditioning unit that is centrally located in, or on, a building or structure and from which air is distributed to desired areas through a system of ducts. The 39S factory packaged unit Individual components, such as fans, coils, and filters, are assembled at the factory. Packaged equipment is less costly than field-fabricated equipment and does not require assembly. The basic air-handling unit consists of a fan section, coil section, and filter. Other...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 6

Application data (cont) Fan selection criteria System requirements — The major factors that influence fan selection are airflow, external static pressure, fan speed, brake horsepower, and sound level. Additional system considerations include the fan control method, overloading, and non-standard air density. Fan selection for air-conditioning service usually involves choosing the smallest fan that provides an acceptable level of performance, efficiency, and quality. Pressure considerations — The static pressure is the resistance of the combined system apart from the fan. Contributors to...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 7

FORWARD-CURVED FAN 7 MSE 6 SC 5 TOTAL IN. WG Sound considerations — The fan is one of the main sound sources in an air-conditioning system. Other sources of sound include the duct system and terminals, because they generate turbulence in the air flowing through them. Simply estimating fan sound does not give an accurate picture of total system sound, but because fan sound is a major component of system sound, fan sound should be minimized. To minimize its sound generation, a fan must be correctly sized and should be selected to operate at or near peak efficiency. Oversized fans can generate...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 8

Application data (cont) Power losses in the motor and drive should be allowed for when determining the motor output (bhp), so that the motor can be correctly sized and so that the additional heat output can be subtracted from cooling capacity or added to heating capacity. A typical example follows: Given Fan Operating Point: 13,224 cfm 9.6 Fan bhp 3.0% estimated drive loss Calculate the required fan motor output (Hp) due to drive loss: Hp = (Fan bhp) x (Drive Loss) Hp = 9.6 x 1.03 Hp = 9.89 hp (select 10 Hp motor) Calculate the total fan motor heat output (Q) according to motor efficiency:...

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39SH,SV,SM,SR00-17 Indoor and Outdoor Air Handlers - 9

System parameters Before a fan type or control is selected, the system must be analyzed at both the design point and part load. The fan is likely to be operating at part load a large percentage of the time. Methods of fan air-volume control • “Riding the fan curve” with terminal throttling (forward curved fans) • Variable frequency drives (VFDs) A short description of these control methods follows. A summary comparison table is provided at the end of the section. Forward-curved (FC) fans with terminal throttling (riding fan curve) — This is the simplest, most reliable, and most economical...

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