Catalog 220-1 RoofPak® Applied Rooftop Systems with Energy Recovery Wheels Packaged Heating and Cooling Units Type RFS/RPS – 15 to 75 Tons Type RDT – 45 to 75 Tons Rooftop Air Handlers Type RAH/RDS – 4,000 to 30,000 CFM MEA 368-93-N TABLE OF CONTENTS TABLE OF CONTENTS Introduction . 3 Physical Data . 18 Daikin Energy Recovery Systems................3 Cooling Capacity Data . 20 Factory-Installed and Tested Package ............3 Heating Capacity Data . 28 Roofpak Energy Recovery Systems . 4 Gas Heat ..................................28 Energy Savings ..............................4 Electric Heat . .30 Satisfies ASHRAE 90.1-2004 Energy Recovery Steam and Hot Water Heat ...................31 Requirements . .4 Component Pressure Drops . 32 A Complete, Factory-Tested Package.............4 Energy Recovery Module Air Pressure Drop Enthalpy Wheel Design........................4 Fan Loss ..................................32 Return/Exhaust Air Fan ........................5 Fan Performance Data . 35 Handling Moisture ............................5 Supply Fans ...............................35 Summer Performance .........................5 Airfoil Return Fans . 40 First Cost and Operating Cost Reductions .........6 Dimensional Data . 41 Two Arrangements Offered .....................6 Section Options and Locations . 41 Parallel Air Paths on Energy Recovery Wheel Electrical Knockout Locations ..................46 Applications.................................7 Drain and Air Connection Locations .............47 Enthalpy Wheel Controls and Wiring . .8 Piping Entrance Locations ....................48 Energy Recovery Bypass Damper Control .........8 Roof Curbs . 49 Application Considerations . 9 Recommended Clearances . 52 General ....................................9 Service Clearance...........................52 Unit Location ................................9 Overhead Clearance .........................52 Split Units ..................................9 Ventilation Clearance ........................52 Curb Installation .............................9 Electrical Data . 53 Acoustical Considerations.....................10 Supply Power Wiring.........................56 Ductwork ..................................11 Weight Data . 57 Filters . 11 Unit Weights . .57 Variable Air Volume Application.................12 Fan Motor Weights ..........................58 Fan Operating Range ........................12 Roof Curb Weights . 61 Altitude Adjustments .........................12 Engineering Guide Specification . 62 Condenser Performance ......................13 Wheel Performance .........................13 Furnace Performance . .13 Unit Selection . 14 DesignFlow, Hi-F, MicroTech, Protocol Selectability, RoofPak, SelectTools, SpeedTrol, SuperMod, UltraSeal, and VaneTrol are trademarks Daikin Applied Americas. Microsoft is a registered trademark of Microsoft Corporation. Windows is a trademark of Microsoft Corporation. © 2018 Daikin Applied. All rights reserved throughout the world. CAT 220-1 • ROOFPAK APPLIED ROOFTOPS 2 www.DaikinApplied.com INTRODUCTION INTRODUCTION Daikin Energy Recovery Systems Factory-Installed and Tested Our energy recovery device transfers both heat and moisture energy between the exhaust and ventilation air. In doing so, it Package conditions the incoming ventilation air. This total energy device Daikin energy recovery systems are provided as a one-piece, offers a cost-effective and efficient method for containing factory-installed and tested package. The package includes energy costs while meeting the ventilation requirements of an AHRI certified enthalpy wheel, exhaust fan with VFD, ASHRAE Standard 62.1-1999. prefilters, and, for economizer applications, optional bypass dampers and controls (see Figure 1). This helps to eliminate field coordination and leakage problems associated with field installation. The outdoor and exhaust air flows are arranged in counterflow for better efficiency, and to reduce field cleaning requirements. Exhaust contaminants cannot enter the ventilation air because the exhaust air static pressure is always less than the ventilation air static pressure. Frost protection and purge options are also available. Figure 1: Energy Recovery Module www.DaikinApplied.com 3 CAT 220-1 • ROOFPAK APPLIED ROOFTOPS ROOFPAK ENERGY RECOVERY SYSTEMS ROOFPAK ENERGY RECOVERY SYSTEMS Energy Savings Enthalpy Wheel Design Daikin energy wheels normally recover 70–75% both sensible The unique composition of the Daikin energy wheel (see and latent energy. The result can be considerable energy Figure 2) provides significant advantages. Composed savings: of synthetic fiber, it allows moisture-absorbing desiccant • They provide twice as much summer energy recovery to be uniformly and permanently dispersed throughout as sensible only alternatives such as plate frame heat the wheel, maximizing its life expectancy. The desiccant exchangers and run-around loops. forms a molecular sieve that attracts water and minimizes contamination. The honeycombed design and small aperture • Energy recovery increases the air conditioning capacity sizes of our wheel provide even air flow and minimize internal by 25% if minimum outdoor air design is 33%. Therefore, wheel bypass - unlike other energy recovery wheels that can a 75 ton unit with energy recovery provides about 90 separate or be spread apart by air flow and risk contamination tons of cooling capacity. The cost savings on mechanical of ventilation air from the exhaust air. Other benefits include: heating and cooling components offset the additional cost of energy recovery. • Homogenous media - not coated or bonded and will not delaminate • Winter humidification energy costs may be cut up to 60%. • Synthetic wheel media is completely corrosion resistant • Winter latent energy recovery lowers the dew point of exhaust air, compared to sensible only alternatives and • Unitary wheel construction maximizes face flatness allows frost-free operation to lower ambient temperatures. • Fluted geometry minimizes internal cross leakage • Molecular sieve desiccant reduces cross contamination Satisfies ASHRAE 90.1-2004 • Wheel is completely water washable Energy Recovery Requirements Cassette Design • ASHRAE 90.1-2004 usually requires energy recovery if • Heavy duty galvanized steel construction with removable the design requires more than 5000 total CFM and more side panels than 70% minimum outdoor air. • No-maintenance bearings standard on small cassettes • The Daikin energy recovery effectiveness exceeds ASHRAE 90.1-2004 requirements. • Flanged outboard bearings used on larger cassettes • Full contact brush seals minimize leakage A Complete, Factory-Tested • AC drive motor with Power Twist link belt Package • Optional variable speed drive motor available • Adjustable purge section, provided as standard, reduces Outdoor and Return Air Prefilters cross-contamination 2" pre-filters are provided in both the outdoor and return air, to Figure 2: Energy Wheel Construction minimize the need for cleaning the wheel. AHRI and UL Conformance The Daikin energy recovery wheel is AHRI certified for performance and UL recognized for safety. Integrated Cooling, Heating and Recovery Control Mechanical heating and cooling are supplied as necessary to supplement the wheel and maintain space conditions. Free Cooling Units with economizers include bypass dampers that are opened when “free cooling” is available. The wheel is simultaneously turned OFF. Proper Exhaust Exhaust fan speed is controlled for proper exhaust, using a factory installed Variable Frequency Drive (VFD) and space building pressure sensor. CAT 220-1 • ROOFPAK APPLIED ROOFTOPS 4 www.DaikinApplied.com ROOFPAK ENERGY RECOVERY SYSTEMS Figure 3: Adjustable Purge Return/Exhaust Air Fan Outside Air at A return/exhaust air fan is provided in a typical exhaust fan Atmospheric Pressure Supply Air configuration. This allows the exhaust to be at a lower pressure than the OA intake and minimizes cross-contamination. Any leakage must occur However, this fan has characteristics of both a return air fan from outside to Exhaust Air Adjustable Purge (RAF) and an exhaust air fan (EAF). due to pressure gradient (See Detail) • EAF characteristic - It only exhausts air and must be sized to handle return duct APD at maximum exhaust Exhaust Air cfm. • RAF characteristic - It always operates whenever the SAF operates and the SAF does not need to be sized for the return duct APD. Plenum Fan • RAF characteristic - The fan will do an excellent job of draws a negative pressure NOTE: Maintain the pressure gradient to preventing positive building pressure because it draws a prevent cross contamination from the large negative at the return of the unit. Exhaust to Outside Supply Air The EAF/RAF must be controlled by building pressure. This control is included with the MicroTech® II controls option. Figure 4: Purge Detail Adjust purge in this Handling Moisture direction to decrease OUTSIDE AIR capacity and increase Low space humidity is a common problem in the winter and purge can cause both discomfort and health problems for tenants. It also leads to increased static electricity, which can be damaging to computer equipment. However, mechanical humidification requires 1,100 btu per pound of humidity. Our energy recovery system provides the added benefit of significantly raising the humidity level of outdoor air in the winter. Not only can this have EXHAUST AIR a dramatic impact on the first cost and operating cost of an HVAC system, it can also dramatically improve indoor air quality and