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Bulletin AH-TB
January 2011
(Replaces AH-91C)
Air Handlers
Tech Bulletin
For Air Conditioning, Heating and Ventilation
Available in Bohn™, Climate Control™, Chandler™ & Larkin™
Models HCS, HCL
VCS, HD
Size 03 thru 75
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Index Index Features, Accessories 3 - 10 Performance, Selection 11 - 23 Fan Data 24 - 29 Dimensional Data 29 - 38 Weight 39 Static, Air Pressure Drop 40 - 41 Physical Data 42-43 Mechanical Specifications 44 Quick Cues for the five cabinet styles: S = SHORT in model HCS VCS MODELS 03 - 41 L = LONG in model HCL 11 Standard Models V = VERTICAL in model VCS Capacities From HD = HEATING DUTY in model HD 1000 to 24000 CFM Quality Standard Heatcraft has built high performance air handlers Our
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Features Nomenclature HCL 0 6 F C Cabinet style Fan Type: HCS — (S for Short) Insulated fan section with motor FC - Forward curved fans, available base and access door(s), horizontally adjacent (same with all cabinet styles, sizes 3 thru 41 elevation) with insulated short depth coil section with drain pan. AF - Air foil type fans, available with sizes 20 thru 75, all cabinets except HCL — (L for Long) Insulated fan section with motor VCS styl
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Standard Unit Features Basic Ca Motor Mount Basic Cabinet Heatcraft puts the motor inside the fan section cabinet. It is Consists of a fan section and a coil section with double wall drain mounted on a heavy gauge steel slide rail base. There are several pan. The housing panels are die formed from mill galvanized steel advantages with internal motor location. It eliminates the need for and insulated with 1" - 3/4 pound density mat faced fiberglass a bulky belt guard. Another advantage is t
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Air Handler Coils There are a wide variety of coil types to meet the load requirements of conditioned spaces. Heatcraft’s four coil types are: water, direct expansion, heat reclaim and steam coils. All standard coils have copper tubes and aluminum fins and a heavy gauge mill galvanized steel casing. Staggered tube designs increase air turbulence and improve coil performance. The plate type, die formed, corrugated fin design provides optimum strength. The fin design also enhances air tur
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Accessories- Electric Heat Electric heaters are UL listed for duct installation. The UL label applies to the heater only, not the complete air handler. Heaters are furnished as a separate section and are available with insulated or uninsulated casings. Controls such as contactors, fuses, etc., may be factory installed and wired in the heater section end panel provided the number of control steps is not excessive. Remote control panels are also available. Construction & Dimensions Y
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Accessories- Electric Heat The standard electric heater section construction Typical options for the electric heater includes: section are: 1. Automatic thermal cutout 1. Fiberglass insulation in cabinet 2. Heat limiters 2. At least one magnetic contactor per step of 3. Air flow switch heating (two or three pole break) 3. Three phase fuse blocks and fuses 4. Transformer with primary fusing 5. Manual reset thermal cutout in control circuit Maximu
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Accessories Mix Box Sections The Mixbox is an entering air section. Typically, themixbox Flat Filter Sections accepts air from two sources. Many system designers economize Flat filter sections are space saving and economical. Choose performance by varying the two air flows to deliver conditioned either two inch or four inch filters. The two inch filters can be the air with minimum energy consumption. Mixbox sections are throwaway, the 35% pleated, or the high velocity cleanabl
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Accessories Filters And Auxiliary Sections (see pages 42 and 43 for number and quantity of filters per model) Flat and High Capacity Filter Sections- All Unit Sizes: (Dimensions, Page 29 to 37) 2" flat filter section with choice of three standard filter types: • 2" throwaway filters • 2" 35% efficient pleated filters • 2" permanent high velocity cleanable filters 4" flat filter section: • with 4" 35% efficient pleated filters High capacity filter section with choice of th
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Accessories for Fan and Coil Sections Fan Section Accessory: Available on: Forward curved blower for total static of 3.5" to 6" ........................................................................Models 03 - 18 for all cabinet styles Internal spring isolation (discharge arrangement 2 and 3 only).......................................................All models except size 14 and VCS cabinets Internal spring isolation (discharge arrangement 2, 3, 4, 5 on
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Air Handler Selection 1. Air handler selections vary with each application. Use the index below to find Heatcraft Products air handler performance tables for: • Standard comfort cooling (either direct expansion or chilled water) • Heating (either steam or hot water, either make up air or return air) • Supermarket air conditioning (direct expansion refrigerant) • Heat reclaim (coil performance, refrigerant condenser, typically supermarket) 2. The air handler performance tables give A
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Selection Example Air Handler Selection Conditions: “I want a ceiling mounted air handler that gives 35 tons of cooling and 35 tons of heating. I have 44°F. water for cooling and I have 200°F. water for heating. My entering air temperatures on the coil are standard, that is 80°F. dry bulb and 67°F. wet bulb (50% relative humidity) for cooling. For heating, the entering air temperature is 60°F. I will supply duct work, you should select the motor to handle a half inch of external stati
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Air Handler Performance - Quick Reference Table 1 Heating and Cooling Performance for Selected Coils At 500 FPM (2.54 m/s) and 10 FPI. See notes for coil descriptions and rating conditions. Note 1 Note 2 Note 3 Note 4 Note 5 Note 6 Note 7 air volume at air handler DX air Refrigerant Chilled water Hot water Steam Unit 500 fpm 2.54 m/s face area conditioning Heat reclaim A/C Heating Heating Size CFM cu m/h SQ FT sq m MBH KW MBH KW MBH KW MBH KW MBH KW 03 1565
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Air Handler Performance- Direct Expansion Table 2 Comfort Cooling 1/2" tube, entering air at 80°F. DB and 67°F. WB** 1/2" Tube , direct expansion, cooling capacities 10 FPI**, large coils, 500 FPM** CFM Coil MBH - 4 ROWS MBH - 6 ROWS Unit Std Face 35°F. SST 40°F . SST 45°F. SST 35°F . SST 40°F . SST 45°F . SST Size Air Area Total Sens. Total Sens. Total Sens. Total Sens. Total Sens. Total Sens. 03 15
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Air Handler Perfromance- Direct Expansion Table 4 Supermarket Air Conditioning 1/2" tube, entering air at 75°F. DB and 63°F. WB** 1/2" tube, direct expansion, cooling capacities 10 FPI**, large coils, 500 FPM** CFM Coil MBH - 4 ROWS MBH - 6 ROWS Unit Std Face 35°F. SST 40°F . SST 45°F . SST 35°F . SST 40°F . SST 45°F . SST Size Air Area Total Sens. Total Sens. Total Sens. Total Sens. Total Sens. Total
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Air Handler Performance- Chilled Water 4 Row Coils* Table 6 Comfort Cooling 1/2" tube, entering air at 80°F. DB and 67°F. WB 1/2" tube, chilled water, cooling capacities 10 FPI*, 4 rows, large coils, 500 FPM* CFM Coil 42°F . Entering Water 44°F. Entering Water 45°F. Entering Water Unit Std Face MBH MBH MBH Size Air Area TOTAL SENS GPM PD TOTAL SENS GPM PD TOTAL SENS GPM PD 03 1565 3.13 51 37 10.2 2.4 46 35 9.1
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Air Handler Perfromance- Chilled Water 6 Row Coils* Table 8 Comfort Cooling 1/2" tube, entering air at 80°F. DB and 67°F. WB 1/2" tube, chilled water, cooling capacities 10 FPI*, 6 rows, large coils, 500 FPM* CFM Coil 42°F. Entering Water 44°F. Entering Water 45°F. Entering Water Unit Std Face MBH MBH MBH Size Air Area TOTAL SENS GPM PD TOTAL SENS GPM PD TOTAL SENS GPM PD 03 1565 3.13 70 47 13.9 5.8 63 44 12.6 4.9 60 43
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Air Handler Performance- Hot Water/Steam Table 10 Heating 0°F. Air* Heating, Water 1/2" tube, entering air at 0°F. 1/2" tube, hot water, heating capacities 10 FPI*, large coils, 500 FPM* CFM Face 180°F. Entering Water Coils 200°F. Entering Water Coils Unit Std Area One Row Two Row One Row Two Row Size Air Sq. Ft. MBH GPM PD MBH GPM PD MBH GPM PD MBH GPM PD 03 1565 3.13 75 7.6 0.3 137 14.1 1.5 85 8.8 0.4 155 16.0 1.8 06 2880 5.76 144 14.8 1.0 259 26.6 4.9 164
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Air Handler Performance- Hot Water/Steam Table 12 Heating 60°F. Air* Heating, Water 1/2" tube, entering air at 60°F. 1/2" tube, hot water, heating capacities 10 FPI, large coils, 500 FPM CFM Face 180°F. Entering Water Coils 200°F. Entering Water Coils Unit Std Area One Row Two Row One Row Two Row Size Air Sq. Ft. MBH GPM PD MBH GPM PD MBH GPM PD MBH GPM PD 03 1565 3.13 45 4.6 0.1 86 8.8 0.7 56 5.7 0.2 104 10.7 0.9 06 2880 5.76 89 9.1 0.4 164 16.9 2.2 108 11.2 0.6 19
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Coil Perfromance- Heat Reclaim MBH/SQ FT Table 14 Air Handler Type A Large Type 5 Large Heat Reclaim Coil Selection Example: Unit Coil Face Area Coil Face Area Size Square Feet Square Feet Select reclaim coil for Size 26 air handler at 13280 CFM, 03 3.13 3.00 344 MBH reclaimed at 45°F. Temperature Difference. 06 5.76 5.69 08 7.81 7.50 A. Change the application’s requirement at application’s TD 10 9.77 9.38 to adjusted requirement at 50°F. TD. Use Table 15: 12 12.40 11.69
