Custom Air Handler Solutions Custom Units to Meet Your Unique Design Needs
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1 Custom Units to Meet Your Unique Design Needs Engineered for flexibility and performance
2 Contents Horizontal Configuration....1 Horizontal with Standard Economizer Configuration...2 Stacked Configuration...3 Dual Path Configuration...4 Heat Recovery Wheel Configuration...5 Fixed Plate Configuration...6 Multizone Configuration...7 Dedicated Exhaust Energy Recovery Unit...8 Redundant Fans....9 Short Economizer with Exhaust Air Dampers in Return Fan Section Short Economizer with Exhaust Air Dampers in Return Fan Section Side Return...11 Side Return Fan Opening Version II...12 Side-by-side Energy Recovery Units...13 Dual Wheel Energy Recovery Unit Plate Heat Recovery Unit...15 Dual Duct AHU with Final Filters...16 Energy Wheel On Skyline Unit...17 Dual Direct Drive Fans...18 Double Wheel AHU with UV Lights: 3 Fans, Two Exhaust Air Paths...19 Side-by-side Wheel (over 25 kcfm) and Mis-Matched Air Paths...20 Stacked ERV with Mismatched Heights...21 Dual Path Energy Recovery Unit...22 Total Wheel + Plate with Two 2 2 Fan Arrays...23 Triple Stacked Unit...24 Humidifier & Evaporative Cooling Section...25 Split Outside Air Dampers...26 Bypass Damper on Cooling Coil Side-Car Energy Recovery Wheel DG
3 Design Guide DG Horizontal Configuration Supercedes: ED Figure 1: Unit Components Outdoor Air Supply Air Add temp boxes on all standard configurations Dampers Cooling Coil Return Air Filter Section Supply Fan Heating Coil NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data. Standard template in the software program. Temperature boxes are editable.
4 Design Guide DG Horizontal with Standard Economizer Configuration Supercedes: ED Figure 1: Unit Components Exhaust Air Outdoor Air Dampers Cooling Coil Return Fan Supply Fan Return Air Heating Coil Supply Air NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
5 Design Guide DG Stacked Configuration Supercedes: ED Figure 1: Unit Components Supply Air Outdoor Air Supply Fan Return Air Dampers Filter Section Cooling Coil Heating Coil NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
6 Design Guide DG Dual Path Configuration Supercedes: ED Figure 1: Unit Components Outdoor Air Damper Filter Section Cooling Coil Heating Coil Return Air Damper Filter Section Cooling Coil Heating Coil Supply Fan Supply Air NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
7 Design Guide DG Heat Recovery Wheel Configuration Supercedes: ED Figure 1: Unit Components Return Air Bypass Damper Exhaust Air Exhaust Fan Filter Section Recirculation Bypass Outdoor Air Filter Section Energy Recovery Wheel Bypass Damper Cooling Coil Heating Coil Supply Fan Supply Air NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
8 Design Guide DG Fixed Plate Configuration Supercedes: ED Figure 1: Unit Components Supply Air Exhaust Air Exhaust Fan Cooling Coil Heating Coil Supply Fan Plate Damper Damper Filter Section Filter Section Outdoor Air Return Air NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
9 Design Guide DG Multizone Configuration Supercedes: ED Figure 1: Unit Components Outdoor Air Mutizone Hot Air Heating Coil Dampers Damper Damper Return Air Filter Section Supply Fan Cooling Coil Mutizone Cold Air NOTE: Default temperatures are typical and in F, enter your own data by selecting from the drop-down list or highlighting the contents and typing in your custom data.
10 Design Guide DG Dedicated Exhaust Energy Recovery Unit Supercedes: ED The dedicated exhaust energy recovery unit provides more energy recovery, and often at a lower cost than typical solutions. It is well suited for LEED buildings and schools because of its ability to economically handle large ventilation rates. Figure 1: Unit Components Advantages Side View Recover energy from Class I & II air streams -- Class I air is defined by Standard 62.1 as normal return air with no odors or health issues -- Class II air has some odor, but no health risks (ie: bathroom or cafeteria exhaust) The percentage of class 2 air that may be re-designated as class 1 is limited to no more than 10% by ASHRAE standard 62. A single air handler for both exhaust air streams A lower first cost than multiple smaller ERUs for each restroom Damper and wall arrangement prevents Class II from recirculating to the building Will work for VAV and CAV type systems Bypass dampers can be added to the energy recovery wheel to save fan energy in economizer mode
11 Design Guide DG Redundant Fans Supercedes: ED Redundant fans provide 100% back-up for supply and return fans. This can be used to enhance reliability as well as simplify scheduling of maintenance and service work. Other features that are shown on this unit include: 1. Bypass dampers on the energy recovery wheel to save fan energy when in economizer mode. 2. Return air bypass damper to allow for up to 100% recirculated air in night mode. Figure 1: Unit Components Side View Advantages Complete flexibility in fan selection allows fans to be identical as well as the option to mix fans for different operating conditions Smaller footprint than two units or storing backup fans and parts nearby
12 Design Guide DG Short Economizer with Exhaust Air Dampers in Return Fan Section Supercedes: ED A shorter AHU can be selected by providing exhaust air dampers in the return fan section. Figure 1: Unit Components and Dimensions Side View Plan View Advantages Shorter footprint and lower cost than traditional air side economizers Flexible damper location for exhaust and OA dampers to accommodate installation requirements. (Either side, top or end) Installations in cold climates should use a blender and possibly look at splitting the outside air dampers to encourage better mixing. Check on freeze protection offerings
13 Design Guide DG Short Economizer with Exhaust Air Dampers in Return Fan Section Side Return Supercedes: ED A shorter AHU can be selected by providing exhaust air dampers in the return fan section. Side return opening allows for unit to better match building limitations for the return air path Exhaust air damper is located on the left hand end of the AHU Damper locations can be customized to any side or size in order to accommodate installation requirements. The designer should remember to pay attention to air mixing in climates with cold or hot & humid conditions Figure 1: Unit Components and Dimensions Side View Plan View Advantages Shorter footprint and smaller unit size than a traditional air side economizers The smaller size can provide a lower cost depending on the damper size requirements of the unit
14 Design Guide DG Side Return Fan Opening Version II Supercedes: ED Figure 1: Unit Components and Dimensions Plan View Advantages & Notes L-shape fit best in mechanical room Eliminated fan array needed to shorten unit
15 Design Guide DG Side-by-side Energy Recovery Units Supercedes: ED A side-by-side arrangement can simplify layout of energy recovery units Figure 1: Unit Components Plan View Side View Advantages Exhaust and supply air streams do not have to evenly match dimensions. Wheel performance will change Large units may not fit in an over/under arrangement Flexible wheel selection and placement can help the designer to optimize performance
16 Design Guide DG Dual Wheel Energy Recovery Unit Supercedes: ED Figure 1: Unit Components and Dimensions Advantages Side View A dual wheel AHU combines a total energy wheel with a sensible wheel that provides very good 100% outside air performance. The addition of the sensible wheel gives a higher effectiveness and reheats the supply air from saturated to a more neutral relative humidity These are often supplied on geothermal WSHP projects because they can significantly lower the outside air loads and results in a smaller geothermal loop
17 Design Guide DG Plate Heat Recovery Unit Supercedes: ED Figure 1: Unit Components and Dimensions Side View Plate AHU Energy Recovery Supply air stream Return air stream Exhaust air stream Sensible recovery from exhaust air Economizer air stream Stacked arrangement
18 Design Guide DG Dual Duct AHU with Final Filters Supercedes: ED Figure 1: Unit Components and Dimensions Advantages & Notes Side View Replacement units for healthcare that now need final filters
19 Design Guide DG Energy Wheel On Skyline Unit Supercedes: ED Figure 1: Energy Wheel on Skyline Side View Advantages Low profile unit with energy recovery Rooftop application frees interior space for customer use Only use the horizontally mounted wheel if very low height is required. A vertically mounted wheel is available in a side-by-side that will be a lower cost and smaller footprint.
20 Design Guide DG Dual Direct Drive Fans Supercedes: ED Figure 1: Unit Components and Dimensions Plan View Advantages & Notes Better redundancy, footprint, turndown, etc. Possible on large and small units
21 Design Guide DG Double Wheel AHU with UV Lights: 3 Fans, Two Exhaust Air Paths Supercedes: ED Figure 1: Unit Components and Dimensions Side View The two separate exhaust air streams allow isolation of flows and optimization of separate fan systems. The dual wheels provide a very efficient treatment of outside air that can lower first cost expenses for compressor cooling, heating and possible geothermal loop costs.
22 Design Guide DG Side-by-side Wheel (over 25 kcfm) and Mis-Matched Air Paths Supercedes: ED Figure 1: Unit Components and Dimensions Plan View Advantages & Notes Single supply air path is larger than Outside Air path Dual plenum fans Bypass dampers on wheel
23 Design Guide DG Stacked ERV with Mismatched Heights Supercedes: ED Figure 1: Unit Components and Dimensions Side View Advantages & Notes Split level of stacked section does not have to match single height section Reduces height and cost of total unit Differences can be larger, but usually not huge
24 Design Guide DG Dual Path Energy Recovery Unit Supercedes: ED Figure 1: Unit Components and Dimensions Advantages & Notes Side View Dual path provides an exhaust airflow only path and a second path for return or exhaust airflow. It is possible to draw exhaust air from both exhaust air streams in this case if the negative static of the supply fan is less than the exhaust at the recirculation damper.
25 Design Guide DG Total Wheel + Plate with Two 2 2 Fan Arrays Supercedes: ED Figure 1: Unit Components Side View Advantages & Notes 2 2 fan array provides redundancy and a smaller footprint Plate and coil wrap-around provides treatment of outside airflow Plate has zero cross leakage
26 Design Guide DG Triple Stacked Unit Supercedes: ED Figure 1: Unit Components and Dimensions Side View Advantages & Notes Third level simplified duct tie-in for contractor
27 Design Guide DG Humidifier & Evaporative Cooling Section Supercedes: ED Figure 1: Unit Components Advantages & Notes Nortec model MH direct humidification for Data Centers Evaporative cooling for the Western US Simple section in Vision AHU Stainless basin Controller included
28 Design Guide DG Split Outside Air Dampers Supercedes: ED Figure 1: Unit Components and Dimensions Advantages Lower cost air measuring with smaller OA damper LEED and Std 189 jobs may require all OA be measured
29 Design Guide DG Bypass Damper on Cooling Coil Supercedes: ED Figure 1: Unit Components and Dimensions Advantages Bypass damper can save the fan energy for the air pressure drop of the coil. Typically.75"-1.00" of static can be reduced off of the fan for all economizer hours and heating hours. Can be provided as a single height unit or as a multiple height unit for larger units that may have interference issues.
30 Design Guide DG Side-Car Energy Recovery Wheel Supercedes: ED Figure 1: Unit Components and Dimensions Advantages Provides a more square footprint where a long AHU might not work Can match a smaller wheel with a a larger AHU to handle smaller percentages of OA with a larger return air AHU
31 DG
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