SPV / SDV Series SINGLE DUCT TERMINAL UNITS

Transcription

1 SPV / SDV Series SINGLE DUCT Price single duct terminal units are designed to control the airflow rate of conditioned air into an occupied space with minimal pressure drop and low noise levels. An extensive selection of liners is available where indoor air quality is critical. Control options can be chosen to suit almost any application with pneumatic, analog and DDC. Clean and efficient design produces minimal pressure drop and low noise. Robust damper design is proven to operate to over 1.5M cycles Compact configuration makes it easier to use in crowded mechanical spaces SP300 multipoint sensor for accurate duct air velocity pressure measurement Selection of liners available for hospital applications for additional product information, including product videos and brochures.

2 Product Information General Information Price has, as a primary component of its terminal unit line, the SPV (pneumatic controls), SDV (digital controls) single duct VAV assemblies. These units are designed to control the airflow rate of conditioned air into an occupied space in response to a control signal, usually a thermostat. The clean and efficient design of these single duct terminal units result in a system component which has minimal pressure drop reducing fan horsepower require ments, and low noise generation for quiet operation. A compact configuration makes this unit easier to use in today s crowded mechanical spaces or in retrofitting existing systems. Control options for this product line are wide and varied with pneumatic, analog electronic and state of the art direct digital control available to suit most any application. Most of the control options utilize the exclusive Price SP300 multipoint sensor for accurate duct air velocity pressure measure ment. This allows the terminals to monitor the desired flow rate, as dictated by the thermostat, and com pensate instantly for any changes in supply air pressure that might tend to alter the supply volume. In other words, the net result is a pressure indepen dent variable air volume system. In addition to the basic volume control assembly, a complete line of accessories is offered to meet specific job require ments. Sound attenuators, multioutlet adaptors and heating coils are all available. These are factory assembled to the basic assembly for ship ment as an integrated unit. Features: Capacities ranging from cfm ( L/s) in 11 sizes. Pressure independent operation. Can be used for VAV or constant volume applications. Available with pneumatic, or direct digital controls. Factory calibrated to job requirements. Individually adjustable minimum and maximum air volumes easily field adjusted. SP300 multipoint flow sensor designed to maintain control accuracy independent of field installation conditions. Gauge taps for flow measurement and balancing supplied with factory mounted pneumatic controls (optional for digital controls by others). Conveniently accessible externally mounted controls. Inlet connection bead offers a means for secure flex duct connections. A full 2 in. (50mm) inlet connection to secure flex and hard duct connections. Copyright Price Industries Limited Model SDV Product Selection Checklist 1] Select Unit Inlet Size based on control and acoustic parameters. 2] Select Control type (Pneumatic, Digital) based on system design. 3] Select Accessories (Multi-Outlet Adaptor, Attenuator) as required. 4] Select Reheat Coil, if required. 5] Select Control Sequence based on system design. Full range of accessories available (i.e. coils, attenuators, etc.). NEMA1 Protective metal shrouds for digital (by Price) controls. Protective metal cover optional for pneumatic controls. Compact, lightweight design for ease of installation. 22 gauge zinc-coated steel housing (optional 20 gauge available). 1 /2 in. [13] thick, min. 1.5 lb density fiberglass internal insulation meets requirements for NFPA90A and UL /4 in. [19] and 1 in. [25] insulation also available as an option. Special liners and insulations available see page F52. Damper blade constructed of two layers of heavy gauge galvanized steel with a sandwiched peripheral gasket of cross linked polyurethane foam to ensure tight seal and no damper deflection. Plated damper shaft with position indicator is mounted in self-lubricating bearings. Optional insulated access door 4 x 6 (102 x 171) attached with 4 screws or optional latches. Discharge complete with slip and drive cleat duct connections. All Metric dimensions ( ) are soft conversion. Performance certified in accordance with the AHRI 880 certification program. Units with factory-mounted high voltage components like transformers or disconnect switches are ETL certified to UL 873. Selected product configurations are OSHPD seismic pre-approved, in compliance with CBC 2013 and IBC F-45

3 Dimensional Data SPV8 Size /16 (132) 4 3 /8 (111) 6 3 /8 (162) 5 (127) Optional Bottom Access Door (AD) Size 4 & 5 have 6 ø duct with inlet and dischage reducer as shown. SDV8 Size 4 16 SDV5 Size 4 16 Multi-Point Sensor (Gauge Taps Optional) Optional Bottom Access Door (AD) Optional NEMAT Controls Enclosure 18 1 /2 (470) 1 /2 in. [13mm] thick, min. 1.5 lb density fiberglass internal insulation which meets requirements of NFPA 90A and UL181. Optional 3/4 in. [19mm] and 1 in. [25mm] also available. 22 gauge zinc-coated steel housing. Mechanically sealed and gasketed, leak resistant construction. Rectangular discharge opening with slip and drive cleat duct connection. Control assembly will be supplied as illustrated on right hand side unless specified otherwise. Gauge taps are standard on units with pneumatic controls (optional with digital controls by others). Clean, dry, 20 psi [138 kpa] for pneumatic unit. Optional insulated access door 4 in. x 6 3 /4 in. ( 102mm x 171mm) attached with 4 screws or optional latches. SPV6 - Pneumatic actuators supplied and mounted by Price. SPV8 - Pneumatic controller and acutator supplied and mounted by Price. SDV5 - Controls by others. SDV8- Controls supplied and mounted by Price. Optional Access Door 4 3 /4 (121) Optional Bottom Access Door (AD) Bottom Access Door 4 x 6 3 /4 (102 x 171) AD - Access Door w/screws 4 (102) x 6 3 /4 (171) F-46 ADL - Access Door w/snap Latches 4 (102) x 6 3 /4 (171) ADQ - Access Door w/quarter Turn Sash Latches 4 (102) x 6 3 /4 (171) Note: Optional top and bottom access door available (TB) IP Units [in.] SI Units [mm] Unit L/s cfm Outlet Inlet Length Outlet Inlet Length Size Range Range B C A L B C A L / / / / / / / / / / / / / All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

4 Dimensional Data SPV8 Size 24 x /16 (132) 5 (127) Optional Bottom Access Door (AD) SDV5 and SDV8 Size 24 x 16 Multi-Point Sensor (Gauge Taps Optional) (81) 3 89 Optional Bottom Access Door (AD) 1 /2 in. [13mm] thick, min. 1.5 lb density fiberglass internal insulation which meets requirements of NFPA 90A and UL181. Optional 3/4 in. [19mm] and 1 in. [25mm] also available. 22 gauge zinc-coated steel housing. Mechanically sealed and gasketed, leak resistant construction. Rectangular discharge opening with slip and drive cleat duct connection. Control assembly will be supplied as illustrated on right hand side unless specified otherwise. Gauge taps are standard on units with pneumatic controls (optional with digital controls by others). Clean, dry, 20 psi [138 kpa] control air required for pneumatic unit. Optional insulated access door 4 in. x 6 3 /4 in. ( 102mm x 171mm) attached with 4 screws or optional latches SPV8 - Pneumatic controls supplied and mounted by Price. SDV5 - Controls by others. SDV8 - Controls supplied and mounted by Price. IP Units [in.] SI Units[mm] Unit L/s cfm Outlet Inlet Length Outlet Inlet Length Size Range Range B C D E L B C D E L 24 x / / Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-47

5 Accessories Water Coil Section Note: 1 and 2 row High Capacity (HC) coils available with 12 fins per inch see performance tables Insulated Insulated Bottom Bottom Access Insulated Access Door Bottom Door Access Door Not Insulated Not Insulated Not Insulated Insulated Insulated Bottom Bottom Access Insulated Access Door Bottom Door 6 1 /2 (165) Access Door 6 1 /2 (165) 6 1 /2 (165) Coil Connections Size Row - 1 /2 in. [13] OD Size 9 24x16 1 Row - 7 /8 in. [22] OD Size 4 24x16 2, 3, 4 Row - 7 /8 in. [22] OD Dimension 'L' For 1 row or 2 row Coils L = 5 in. [127] For 3 and 4 Row Coils L = 7 1 /4 in. [184] Not Insulated Not Insulated Not Insulated Dimensional Data Unit IP Units [in.] SI Units [mm] Size B C B C 4, 5, , , / / x AD - Access AD - Access Door w/screws Door w/screws 4 (102) AD 4 x - 6Access (102) 3 /4 (171) x 6Door 3 /4 (171) w/screws 4 (102) x 6 3 /4 (171) ADL - Access ADL - Access Door w/snap Door w/snap Latches Latches 4 (102) ADL 4 x 6- (102) 3 Access /4 (171) x 6 3 Door /4 (171) w/snap Latches 4 (102) x 6 3 /4 (171) ADQ - Access ADQ - Access Door w/quarter Door w/quarter Turn Sash Turn Latches Sash Latches 4 (102) x 6 Downstream ADQ 4 -(102) 3 Access /4 (171) x 6 Downstream 3 /4 (171) Door w/quarter Turn Sash Latches Access Access Door (ADD) 4 (102) x 6 Downstream Door (ADD) Note: Optional Note: Optional top and top bottom and access 3 /4 (171) bottom access door available door available (TB) (TB) (Not Insulated) Access (Not Insulated) Door (ADD) Note: Optional top and bottom access door available (TB) (Not Insulated) Electric Duct Heater Size /16 (910) 18 (457)* * Consult submittal drawing for actual configuration and dimensions. ** Heater section not insulated. Insulation option available. ** Unit IP Units [in.] SI Units [mm] Size B C D E B C D E / / / Electric Duct Heater Size 24 x Unit Size Max L/s Max cfm IP Units [in.] Outlet Inlet Length B C D E L 24 x / / /2 ** Unit Size Max L/s Max cfm SI Units [mm] Outlet Inlet Length B C D E L 24 x F-48 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

6 Accessories RDC Round Discharge Collar Unit Size IP Units [in.] RDC Outlet SI Units [mm] RDC Outlet 4, 5, 6 4, 5, 6 102, 127, 152 7, 8 7, 8 178, 203 9, 10 9, , HSG Oversized Casing 4 3 /8 (111) 6 3 /8 (162) Size 4 & 5 have 6 ø duct with inlet and dischage reducer as shown. Model IP Units [in.] SI Units [mm] Inlet Casing Max Max Outlet Inlet Length Outlet Inlet Length Size Size L/s cfm B C A L B C A L / HSG / / HSG / / / / HSG / / HSG / / HSG / HSG 24x x The oversized casing option utilizes a casing one unit size larger than the standard unit. Accessories such as water coils, attenuators, and MOA will correspond to the larger casing size. For sound performance, use: - discharge sound data for standard SDV unit corresponding to inlet size. - radiated sound data for standard SDV unit corresponding to larger casing size. CB Controls Bottom Multi-Point Sensor c/w Gauge Taps 1 /2 (13) Damper Shaft 4 1 /4 (108) Max. 4 3 /4 (121) Optional Controls Enclosure 18 1 /2 (470) IP Units [in.] SI Units [mm] Unit Outlet Inlet Length Outlet Inlet Length Size B C A L B C A L / / / / / / / / / / / / / Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-49

7 Accessories ATT Attenuator Section L Discharge attenuator section is provided as integral extension to the single Duct Terminals size Unit Size IP Units [in.] Metric Units [mm] B C L B C L ATT ATT5 ATT ATT5 4, 5, / / , / / , / / / / / / / / / / Typical Accessories Configurations SDV c/w Integral Attenuator SDV c/w Integral Attenuator and R.H. Water Coil SDV c/w separate Attenuator ATTSP, ATT5SP SDV c/w separate Attenuator ATTSP, ATT5SP and R.H. Water Coil PKIT Pneumatic Controls Kit 14 3 /8 (365) 7 3 /4 (197) 1 /2 (13) 3 11 /16 (94) 7 3 /8 (187) SDV c/w Integral Attenuator and Electric Coil SDV c/w R.H. Water Coil SDV c/w R.H. Electric Coil SDV c/w MOA Gauge Taps Damper Normally Open - PKIT-NO 1 /2 (13) 22 gauge zinc-coated mounting plate with pneumatic controls for field/warehouse installation. SDV c/w MOA and R.H. Water LCoil L Damper Normally Closed - PKIT-NC MOA Multi-Outlet Attenuator Section All outlets c/w manual dampers. Standard MOA Outlet Arrangements MOA Outlets Standard outlet sizes are listed below. MOA Outlets Unit IP Units SI Units Size [in.] [mm] 4, 5, , , 10, ACS Adaptor Coupling Section* * Used to attach a size 8 MOA to a size 4,5, or 6 terminal, allowing larger outlet sizes. F-50 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

8 Liners Terminal Casing Price offers an extensive Terminal Unit Liner System to address the issue of terminal unit insulation fibers entering the air stream. Each liner system offers benefits that are designed to meet applications with various lining and insulation requirements. SM AFPM SM Solid Metal Liner System This system integrates a fiberglass insulating material with a solid sheet metal liner constructed from zinc-coated steel. The solid metal liner system complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) Solid metal liners offer the ultimate protection against exposure of fiberglass particles to the air stream. The fiberglass insulation is completely enclosed in metal eliminating the possibility of punctures exposing the fiberglass particles. This system is also resistant to moisture. The encased insulation pro vides thermal resistance, however, acoustic absorption of discharge noise is significantly reduced. The following thicknesses are available SM - 3 /4 in. [19] thick, R value=3.2 SM1-1 in. [25] thick, R value = 4.1 PM Perforated Metal Liner System This system integrates a fiberglass insulating material with a perforated metal liner constructed from coated steel. The edges are sealed with metal caps. The perforated metal liner system complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) The metal perforated liner system provides effective protection against damage of the insulation while maintain ing some acoustic value. Small fiberglass particles could conceivably still escape through the perforations and moisture can also be exposed to the insulation. The following thicknesses are available PM AFPM Aluminum Foil with Perforated Metal Liner System This system integrates foil-faced fiberglass insulating material with a perforated metal liner. The edges are sealed with metal end caps to prevent particles from entering the air stream. The double liner system (aluminum foil/ perforated metal) complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) The aluminum foil with perforated metal liner system provides effective protection against damage of the liner while maintaining some acoustic value. The aluminum foil prevents fiberglass particles from escaping through the perforations as well as resistance to moisture penetration. AFPM - 5/8 in. [16] thick, R value=2.6 AFPM1-1 in. [25] thick, R value = 4.1 WFPM WFPM Woven Fabric with Perforated Metal Liner System This system integrates a fiberglass insulating material with woven fabric facing to prevent particles from entering the air stream. Perforated metal liner, covers the insulation and the edges are sealed with metal caps. The double liner system (woven fabric/ perforated metal) complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) The woven fabric with perforated metal liner system provides effective protection against damage of the liner and/or insulation, while maintaining some acoustic value. The woven fabric prevents fiberglass particles from escaping through the perforations. Since the fabric is porous, the system is not totally impervious to moisture R value=3.2. PM - 3 /4 in. [19] thicks, R value = 3.2 PM1-1 in. [25] thick, R value = 4.1 Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-51

9 Liners Terminal Casing FB Foil Board Liner System FB This system integrates 4 lb. density rigid fiberglass insulating material with an aluminum foil facing. Exposed edges are coated with NFPA-90A approved sealant. The fiberglass insulation and aluminum foil liner complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) Acoustic absorption of aluminum foil lined insulation is reduced compared to standard unlined units. The aluminum foil liner is non porous, thereby protecting the insulation from moisture. Damage to the liner can expose fiberglass particles to the air stream. The following thicknesses are available FB - 5 /8 in. [16] thicks, R-value =2.6 FB1-1 in. [25] thick, R-value = 4.2 FG Fiberglass Line This system integrates 1.5 lb. density fiberglass insulating material to provide lining and insulation characteristics. Fiberglass insulation meets NFPA 90A requirements and complies with the following industry standards and tests: ASTM C 1071 UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) The following thicknesses are available FG50-1 /2 in. [13] thicks, R-value = 2.1 FG75-3 /4 in. [19] thicks, R-value = 3.2 FG1-1 in. [25] thick, R-value = 4.1 FG 3/4 (19) F-52 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

10 Cleanroom Construction General Information Price single duct terminal units with cleanroom construction are designed for those applications where indoor air quality (IAQ) is critical. These units are ideally suited to hospital applications such as patient rooms, burn wards, operating rooms and laboratories as well as cleanrooms and other areas where airborne particles are of concern. Today, when IAQ is a growing concern, the Price line of cleanroom terminals can be successfully applied to regular commercial construction. Terminals with cleanroom construction are designed to reduce the risk of micro-organism growth within the terminal as well as prevent fibrous particles from entering the primary airstream as airflows through the unit. The proven design of the Price standard single duct terminal unit incorporates unique design features to provide these benefits. Attenuators and multi-outlet attenuator sections are available and are specifically designed to match these terminals with cleanroom construction. These sections are shipped as an integral part of the terminal unit. Three options of cleanroon construction are offered to meet the specific needs of various applications. The options are designated CRAF, CRWF, and FF. FF Fiber Free Foam Insulation System This system integrates an engineered foam which provides excellent insulating characteristics. The foam edges are self sealing due to the material s composition. The engineered foam meets requirement of NFPA 90A and complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth & Humidity) UL 723 (25/50) (Flame & Smoke) ASTM E 84 (25/50) (Flame & Smoke) CAN/ULC M88 (Flame and Smoke) Fiber free foam insulation totally eliminates the risk of fiberglass particles entering the airstream while maintaining thermal resistance and acoustic absorption. An important advantage over other liner systems is that even scrapes or punctures will not expose fibers to the airstream. The foam also will not absorb water, reducing the likelihood of mold or bacterial growth. Acoustic absorption of the foam insulation is equivalent to aluminum foil faced insulation. The following thicknesses are available FF50-1 /2" (13) thick, R value =2 FF - 3 /4" (19) thick, R value =3 FF1-1" (25) thick, R value =4 FF Foam Insulation Housing Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-53

11 Cleanroom Construction CRAF Cleanroom Aluminum Foil System This system integrates a rigid 4 lb. density fiberglass insulating material with an aluminum foil facing. All edges are sealed with metal endcaps and corner angles to prevent particles from entering the air stream. The liner s integrity is maintained where the damper shaft penetrates the insulation by a flanged nylon bushing. To reduce risk of liner damage during installation, sealed-in-place s-cleats are provided at the discharge collar. The fiberglass insulation and aluminum foil liner complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) Acoustic absorption of aluminum foil lined insulation is reduced compared to standard unlined units. The aluminum foil liner is nonporous, thereby protecting the insulation from moisture. The smooth surface of the liner reduces the risk of micro-organisms being trapped in the material and also facilitates cleaning. Damage to the liner can expose fiberglass particles to the air stream. The following thicknesses are available CRAF - 5 /8 in. [16] thick, R-value=2.6 CRAF1-1 in. [25] thick, R-value =4.2 CRWF Cleanroom Woven Fabric System This system integrates fiberglass insulating material with a woven fabric facing. All edges are sealed with metal end caps and corner angles to prevent particles from entering the air stream. The liner s integrity is maintained where the damper shaft penetrates the insulation by a flanged nylon bushing. To reduce risk of liner damage during installation, sealed-in-place s-cleats are provided at the discharge collar. The fiberglass insulation and fabric liner complies with the following industry standards and tests: UL 181 (Air Erosion) UL 181 (Mold Growth and Humidity) UL 723 (25/50) (Flame and Smoke) ASTM E 84 (25/50) (Flame and Smoke) ASTM C 665 (Fungi Resistance) ASTM C 1071 (Physical Properties) The woven fabric liner provides acoustic absorption equivalent to aluminum foil faced insulation with slightly improved attenuation at high frequencies. The fabric is more porous than aluminum foil, therefore moisture can be absorbed into the insulation. If the liner is damaged, fiberglass particles can be exposed to the air stream. The woven fabric liner has been specified in certain areas for many years and has a proven track record in health care applications, R value = 2.6. The following thicknesses are available CRWF - 3 /4 in. [19] thick, R-value=3.2 CRWF1-1 in. [25] thick, R-value =4.1 CRAF CRWF Fiberglass with woven fabric facing Metal Flange Captures and seals insulation ends Zinc-Coated Metal Angles Encloses seams to further reduce risk of micro-organism growth Reinforced, Non-Porous, Smooth Foil or Fabric Faced Insulation Reduces risk of moisture formation and micro-organism growth Smooth surface facilitates cleaning ASTM C665, UL 181, NFPA 90A Nylon Flanged Bushing Seals insulation S Cleats Sealed in place to reduce risk of damage to liner during installation CRAF and CRWF Construction Features F-54 Insulated Inlet Panel Covered with sheet metal Caulking Seal Inside Inlet Panel Mold-resistant caulking seals Internal Insulation to Inlet Duct All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

12 Low Temperature Construction Product Overview Price single duct terminal units with low temperature construction are designed to handle low temperature supply air for VAV distribution to Price low temperature diffusers. These units are specifically designed to control the airflow rate of low temperature conditioned air into an occupied space in response to a control signal, usually a thermostat. Control options for this low temperature product line are wide and varied with pneumatic, analog electronic and stateof-the-art direct digital control available, to suit most any application. For complete detailed information on control options see Terminal Unit Engineering Guide, Section EG. In addition to the basic volume control assembly, a complete line of specially designed construction features have been incorporated to reduce risk of condensation. These features include: Thermally isolated inlet duct and damper assemblies. Shielded, insulated inlet duct sleeve. Insulated damper blade. Low temperature insulation. Price Single Duct Accessories con struction features incorporated to reduce risk of condensation include: Factory assembled Price SXV with Price Hot Water Coil. Price Hot Water Coil is externally insulated with 1/2 in. [13] foil face insulation, sealed and thermally isolated from the SXV housing. Factory assembled Price SXV with Price attenuator is internally insulated with low temperature insulation. Factory assembled Price SXV with Price MOA is internally insulated with low temperature insulation. Low Temperature Insulation Price offers two options for low temperature insulation. Both options provide excellent thermal properties for control of condensation when handling low temperature supply air: LTAF Low Temperature Aluminum Foil: 5 /8 in. [16] thick foil faced 4lb. density fiberglass insulation, R value = 2.6. LTFF Low Temperature Fiber Free: 3 /4 in. [19] fiber free foam insulation R value = 3. (for more information see FF on page F52) Low Temperature Insulation Caulking Seals Inside of Inlet Panel Shielded Insulated Inlet Duct Sleeve Fully Insulated Damper Insulated Inlet Panel Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-55

13 Low Temperature Construction Installation Guidelines Single Duct Terminal units designed for low temperature air distribution must be installed using recommended industry practice, (i.e.: all ductwork must be thermally protected and all joints and seams sealed to ensure that condensation does not form). Single duct terminal unit with hot water coil A factory installed external wrap is provided around the hot water coil section which is connected and sealed to the terminal unit. Hot water coil units with attenuators or MOAs are factory assembled and the duct connections sealed. Single duct with attenuator The single duct terminal unit and attenuator are factory assembled and sealed. Single duct with multi outlet attenuator, MOA The single duct terminal unit and MOA unit are factory assembled and sealed. It is recommended to field insulate the MOA outlet collars and seal the damper quadrants to prevent air leakage. * SPV (pneumatic controls) illustrated Downstream ductwork must be internally or externally lined with thermal insulation. Accessories Single Duct Terminal with Hot Water Coil Single Duct Terminal with Attenuator Single Duct Terminal with MOA Standard Coil Section Optional Coil Section c/w AD (Coil Access Door) Dimensional Data IP (In.)/SI [mm] Nominal Size IP Units [in.] SI Units [mm] L1 L2 B C 1 Row 2 Row L1 L2 B C 1 Row 2 Row 4, / / /2 7 / / / /2 1 / , / / /2 7 / , / / /2 7 /8 7 / / / /8 7 / / / /2 7 /8 7 / / / /8 7 / DAS, DAS5 Attenuator Section F-56 Unit Size MOAOutlets IP Units [in.] SI Units [mm] 4, 5, , , , 16, 24 x All M.O.A. outlets c/w manual dampers. All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

14 Factory Certified Low Leakage Construction (CLL) General Information Certified low leakage units are designed to target energy efficient installations where controlled casing leakage and condensation prevention are important. Factory Certified Low Leakage Air Terminals (CLL) are robust in construction, consistent in quality and offer clean outer appearance due to limited use of external duct sealers. Design features that promote functionality and appearance, while providing the flexibility to meet varied and more stringent leakage requirements: Large compression style access doors these specialized, gasketed access doors reduce leakage while improving serviceability through larger openings and quarter-turn latches. Material and Construction - All units have robust construction features that include flanged and gasketed casing connections at all external casing seams. The need for exterior duct sealer is reduced, resulting in a cleaner appearance. Inner casing and insulation seams are sealed with duct sealer or Hardcast tape to prevent thermal transfer and further reduce air leakage. Factory Testing to Ensure Required Leakage Performance - All production units are individually tested in Price factory to ensure compliance with project specific leakage requirements. Test results are recorded on a label affixed to each CLL unit. Options CLL3 Factory leak tested up to 1% of max design flow at up to 3 in. w.g. (746 Pa) internal pressure. CLL4 Factory leak tested up to 1% of max design flow at up to 4 in. w.g. (995 Pa) internal pressure. CLL6 Factory leak tested up to 1.5% of max design flow at up to 6 in. w.g. (1493 Pa) internal pressure. Inlet dampers are tested at up to either 3 in., 4 in., or 6 in. w.g. (746 Pa, 995 Pa, or 1493 Pa) differential pressure and exhibit leakage rates of less than 2% of maximum nominal flow. Model SDV - CLL option with dual access door Unit being tested Factory Certification Label - Example Date: Tag # Order Number: Customer: Spec: Model: SPV5000 Unit Size: 8 cfm 300 cfm Damper Leakage: 0.00 cfm at 3 in. w.c. Casing Leakage: 0.46 cfm at 1.5 in. w.c. Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-57

15 Dimensional Data (CLL) Certified Low Leakage Construction SDV (CLL construction option) with no access door or with one access door (CADCLL construction) Unit Size Max. cfm Max. L/s IP Units [in.] SI Units [mm] Outlet Inlet Length Outlet Inlet Length B C A w/att w/att5 C A L / / / / / / / / / / / / / / / / / / / / / / / SDV with extended casing and two access doors (CADDCLL construction option) Unit Size Max. cfm Max. L/s IP Units [in.] SI Units [mm] Outlet Inlet Length Outlet Inlet Length B C A L B C A L / / / / / / / / / / / / / Notes: Internal insulation 1/2 in. [13] thick fiberglass (1.5 lb density) which meets requirements of NFPA 90A and UL181. All internal insulation seams sealed with duct sealer or hardcast 1602 tape. 22 gauge zinc-coated steel housing internally sealed and gasketed, leak resistant construction (20gauge option available). Rectangular discharge opening with slip and drive cleat duct connection. Low leakage damper construction - double gasket. Leakage certification label provided by factory. Liners available FF, FF50, FF1, CRAF, CRAF1, FG75, FG1, FB, FB1. Notes: Internal insulation 1 /2 in. [13] thick fiberglass (1.5 lb. [24 kg/m 3 ] density) which meets requirements of NFPA 90A and UL181. All internal insulation seams sealed with duct sealer or hardcast 1602 tape. 22 gauge zinc-coated steel housing internally sealed and gasketed, leak resistant construction (20 gauge option available). Rectangular discharge opening with slip and drive cleat duct connection. Low leakage damper construction - double gasket. Leakage certification label provided by factory. Liners available FF, FF50, FF1, CRAF, CRAF1, FG75, FG1, FB, FB1. F-58 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

16 Recommended Air Volume Ranges Pneumatic Unit Size L/s Min. 3 L/s Max. cfm Min. 3 cfm Max x Notes: 1. Factory calibrated controls must be selected within the above flow range limits. A minimum value of 0 is also available. When an auxiliary flow setting is specified, the value must be greater than the minimum setting and within the range limits. 2. On controls mounted by Price but supplied by others, the air volume ranges are guidelines only. Digital Controls Unit Size 3. Minimum airflow limit for pneumatic controls is based on min 0.02 in. w.g. [5 Pa] differential pressure signal from airflow sensor. Maximum airflow limit is based on max 1.0 in. w.g. [249 Pa] differential pressure signal from the airflow sensor. 4. Minimum airflow limit for digital controls is based on min 0.02 in. w.g. [5 Pa] differential pressure signal from airflow sensor. Maximum airflow limit is based on max 1.5 in. w.g. [373 Pa] differential pressure signal from airflow sensor. L/s Min. 4 L/s Max. cfm Min. 4 cfm Max x Selection of airflow limits outside the listed values is not recommended. Stability and accuracy may not be acceptable at lower than recommended airflow limits. The actual performance will vary depending on the terminal unit controls supplied. CLL Leakage Rates Certified Low Leakage - Casing Leakage Single Duct Size Notes: 4 5 CLL3 CLL4 CLL6 CFM % CFM % CFM % % 1% CLL3 - Factory tested up to 1% of max nominal flow up to 3" W.G. 2. CLL4 - Factory tested up to 1% of max nominal flow up to 4" W.G. 3. CLL6 - Factory tested up to 1.5% of max nominal flow up to 6" W.G % Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-59

17 Typical Selection Guide Discharge NC Basic Unit Ps Across Unit Discharge NC c/w 36 in. Attenuator Ps Across Unit Radiated NC Basic Unit Ps Across Unit Minimum Ps Across Assembly Min. Pt. 0.5 in. 1.5 in. 3.0 in. 0.5 in. 1.5 in. 3.0 in. 0.5 in. 1.5 in. 3.0 in. Unit Airflow Basic Unit w/atten. 1 Row Coil 2 Row Coil Basic Unit in.w.g in.w.g in.w.g in.w.g in.w.g in.w.g in.w.g in.w.g in.w.g Size cfm L/s in.w.g Pa in.w.g Pa in.w.g Pa in.w.g Pa in.w.g Pa 125Pa 375Pa 750Pa 125Pa 375Pa 750Pa 125Pa 375Pa 750Pa x Performance Notes: 1. NC's are derived from sound power levels, which are obtained in accordance with AHRI Standard and ASHRAE Standard Airflow is given in cubic feet per minute, CFM; and litres per second, L/s. 3. Blank spaces (----) indicate NC's less than Asterisks indicate minimum static pressure of unit exceed the minimum opeating pressure across the unit. 5. P's is the difference in static pressure from inlet to discharge of the unit. 6. Pt is the difference in total pressure from inlet to discharge of the unit. 7. Pressure is given in Pascals, Pa and inches of water gauge in w.g. 8. NC values are calculated based on typical attenuation values outlined in Appendix E, AHRI Standard , "A Procedure for Estimating Occupied Space Sound Levels in the Application of Air Terminals and Air Outlets." Radiated NC is based on 5/8" mineral fiber tile ceiling per AHRI attenuation values. Radiated Sound Total Deduction Octave Band Mid Frequency, Hz All Sizes Discharge NC is based on environmental effect, end reflection, flex duct, sound power division and lined duct per AHRI attenuation values Discharge Sound Total Deduction Octave Band Mid Frequency, Hz < 300 cfm cfm > 700 cfm For detailed explanation of the NC calculation refer to engineering guide. F-60 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

18 Typical Selection Guide NC levels presented in the Typical Selection Guide are based on typical attenuation values as outlined in AHRI Standard , Appendix E. AHRI Standard , Appendix E provides typical sound attenuation values for air terminal discharge sound and air terminal radiated sound. The typical attenuation values are recommended for use by manufacturers to estimate application sound levels. In product catalogs the end use environments are not known and the factors presented in AHRI Standard are provided as typical attenuation values. Use of these values will allow better comparison between manufacturers and give the end user a value which will be expected to be applicable for many types of spaces. Following is a detailed description of the typical attenuation values used to determine NC levels on page F62. Radiated Sound Table E-1 of Appendix E provides typical radiated sound attenuation values for three types of ceilings: Type 1 Glass Fiber; Type 2 Mineral Fiber; Type 3 Solid Gypsum Board. Since Mineral Fiber tile ceilings are the most common construction used in commercial buildings, the attenuation values in the Typical Selection Guide are based on Type 2 Mineral Fiber. The following table provides the calculation method for the radiated sound total attenuation values based on AHRI Standard Octave Band Mid Frequency, Hz Environmental Effect Ceiling/Space Effect Total Attenuation Deduction The ceiling/space effect assumes the following conditions: 1. 5 /8 in. [16mm] tile, 20 lb/ft 3 [320 kg/m 3 ] density 2. The plenum is at least 3 ft [0.9m] deep 3. The plenum space is either wide (over 30 ft [9.1m]) or lined with insulation 4. The ceiling has no significant penetration directly under the unit. Discharge Sound Table E-1 of Appendix E provides typical discharge sound attenuation values for three sizes of terminal units. 1. Small box defined as a unit with discharge duct of approximately 8 in. x 8 in. [203 x 203] and capacity less than 300 cfm [142 L/s]. 2. Medium box defined as a unit with discharge duct of approximately 12 in. x 12 in. [305 x 305] and capacity between cfm [ L/s]. 3. Large box defined as a unit with discharge duct of approximately 15 in. x 15 in. [381 x 381] and capacity of greater than 700 cfm [330 L/s]. The following tables provide the calculation method for the discharge sound and total attenuation values based on AHRI Standard Small Box Octave Band Mid Frequency, Hz (< 300 cfm) Environmental Effect ft [1.5 m] Duct Lining End Reflection ft [1.5 m], 8 in [203 mm] Flex Duct Space Effect Sound Power Division Total Attenuation Deduction Medium Box Octave Band Mid Frequency, Hz ( cfm) Environmental Effect ft [1.5 m] Duct Lining End Reflection ft [1.5 m], 8 in [203 mm] Flex Duct Space Effect Sound Power Division Total Attenuation Deduction Large Box Octave Band Mid Frequency, Hz (> 700 cfm) Environmental Effect ft [1.5 m] Duct Lining End Reflection ft [1.5 m], 8 in [203 mm] Flex Duct Space Effect Sound Power Division Total Attenuation Deduction For a complete explanation of the attenuation factors and the procedures for calculating room NC levels, please refer to AHRI Standard Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-61

19 Typical Selection Guide NC vs Sound Power Levels Compare Them Carefully Price represents the sound performance data for the SPV/SDV series of single duct terminals in two manners. The laboratory attained discharge and radiated sound power levels for each unit at various flows and inlet static pressures is presented in the Acoustical Data tables. This data is derived in accordance with AHRI Standard 880 and shows the 'raw' sound power levels of the terminal in the second through seventh octave bands with NO attenuation allowances. This data includes AHRI standard ratings which are on record with the Air-Conditioning Refrigeration Institute. Price also offers this Typical Application and Selection Guide to assist you in selecting the proper size and configuration of terminal for your needs. The attenuation allowances listed are based on values suggested in AHRI Standard , Appendix E. The suggested attenuation allowances are intended to be representative of typical jobsite construction. If your conditions differ significantly from these it is recommended you utilize the sound power level data on pages F68-F70 and the procedures outlined in AHRI Standard If the NC levels listed in the Price catalog are being compared to other manufacturers cataloged NC information, a careful review of the other manufacturers attenuation allowances must be made. If allowances other than recommended AHRI Standard , Appendix E are used, a fair comparison of NC levels cannot be performed. Pressure Drop Explanation 1. Ps is the static pressure drop across the terminal unit from the inlet to the discharge. 2. Minimum Ps across the unit is the pressure drop across the terminal unit from the inlet to the discharge with the damper in full open position. The minimum Ps must be maintained in order to supply the rated airflow through the terminal unit. Minimum Ps values are provided for the basic assembly only and for the basic assembly combined with accessories such as attenuator and hot water coils. The minimum Ps across the terminal unit and accessories does not include resistance of the downstream ductwork or diffusers. To determine the minimum inlet static pressure required to achieve rated airflow the downstream resistance must be added to the minimum Ps. 3. Pt is the total pressure drop across the terminal unit from the inlet to the discharge. Total pressure includes both the static pressure drop and velocity pressure drop. Velocity pressure drop is due to the reduced duct velocity at the terminal unit discharge. 4. NC at Ps across the unit is the NC level produced by the terminal unit with the listed static pressure drop from the inlet to the discharge ( Ps). The listed Ps is the excess static pressure removed by the terminal unit damper. F-62 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

20 Selection Procedure The selection of the terminal unit will be based on the minimum and maximum primary airflows determined to satisfy the space requirements. The maximum flow is determined by the space cooling load while the minimum flow is determined form the ventilation rate per ASHRAE Standard or the space heating load. Price single duct terminals are offered with inlet valve sizes ranging from 4" [102] round to 24 x16 [610 x 406]. Each inlet size has a specific air volume range based on the minimum flow which can be accurately controlled to the maximum flow which will maintain reasonable pressure loss and noise level. Recommended air volume ranges are cataloged for each inlet valve size. Usually several inlet valve sizes will accommodate a particular set of minimum and maximum design flows. A common practice is to select the largest inlet valve size possible in order to reduce the terminal generated sound. While this practice may appear to reduce catalog noise levels this is not necessarily true. The larger size terminal will normally have a lower minimum operating pressure drop requiring the valve damper to throttle more at a given inlet static pressure. The more closed or pinched a valve damper is for a given inlet static pressure, the more sound it will generate. See Figure A for an example. Another disadvantage of an oversized selection is equipment cost as a larger size unit is generally more expensive. All accessories such as reheat coils and attenuators of an oversized unit will add to this cost disadvantage. Pressure independent terminals (VAV) need to control at both the maximum airflow as well as the minimum airflow. The recommended maximum and minimum flow rates are intended to allow any controller to properly resolve the airflow signal and provide the opportunity for control. It is possible when a damper is mostly closed (at low flows), the control accuracy may be degraded as the damper actuator is only using a fraction of the damper travel or stroke and small changes in damper position may generate significant changes in air volume It is recommended that the terminal unit valve be sized for 75 to 80% of the rated air volume capacity. Minimum flow rates should be around 20% of the rated air volume for the most accurate level of control. Should an inlet valve be oversized, another issue may arise if optional electric heaters are installed. At low flows, there may not be sufficient total pressure to activate and maintain the closure of the airflow safety switch, which can easily the to nuisance tripping of the thermal safety switch. Copyright Price Industries Limited Figure A: 1800 cfm Single Duct Terminal, 12 inlet Discharge Sound Power Level (db) Radiated Sound Power Level (db) Octave Band Center Frequency Octave Band Center Frequency Minimum Inlet Static Pressure In order to size the fan system the minimum inlet static pressure at the terminal unit must be determined. The minimum static pressure at the inlet of a single duct terminal unit includes the pressure drop across the unit, the pressure drop across any accessories, plus the pressure drop of the downstream ductwork and diffusers. The minimum static pressures of the terminal units and hot water coils are listed in the typical selection guide. The resistance of electric coils can be considered to be negligible. Providing higher static pressure than required at the terminal inlet will cause the valve damper to throttle more, increasing the terminal generated sound. All Metric dimensions ( ) are soft conversion. Min. Press. Min. Press Min. Press Min. Press Min. Press Min. Press Min. Press Acoustical Selection Procedure Please refer to the Acoustical Selection Procedure on page F14 of the engineering guide. F-63

21 Selection Example Single Duct Terminal Single Duct Selection, Reheat The office zone in the following example consists of three offices, each measuring 15 ft (4.6m) long by 12 ft (3.7m) wide by 9 ft (2.7m) tall with a floor-to-floor height of 12 ft (3.7m). The offices are served by a single terminal unit mounted above the hallway ceiling. Design conditions for the zone will include two occupants in each room with a single computer with LCD monitor. The offices are all lit by T8 fluorescent lighting and the control temperature will be 75 F (24 C) during the day and 65 F (18 C) at night. Space Considerations Heat load sources for each office space: qex = Heat gain from exterior surfaces (Summer), estimated to be 5 Btu/h ft 2 [16 W/m 2 ]* qex = Heat loss from exterior surfaces (Winter), estimated to be 8 Btu/h ft 2 [25 W/m 2 ]* qoe = Heat load of occupants (2 people, 250 Btu/h [73W]) and equipment (308 Btu/h) [90W] ql = Heat gain due to lighting, estimated at 6.82 Btu/h ft 2 [21.5 W/m 2 ] *This heat load should be calculated based on the specific building shell construction Supply air conditions: Tsa = Supply air temperature (cooling mode), 55 F [13 C] Tsa = Supply air temperature (heating mode), 95 F [35 C] Trs,d = Daytime room set-point, 75 F [24 C] cp = Specific heat of air at constant pressure, 0.24 Btu/lb F ρ = Density of air, lb/ft 3 Heat Source (Per Office) Imperial Metric Occupants (two) 2 x 250 = 500 Btu/h 146W Computer 308 Btu/h 90W Lighting 12 x 15 x 6.82 = 1228 Btu/h 3.7 x 4.6 x 21.5 = 366W Exterior Solar/Conduction 15 x 9 x 5 = 900 Btu/h 2.7 x 4.6 x 16 = 199W Total 2711 Btu/h 801W The first step is to determine the airflow rate (Q) for cooling conditions: ft Thermostat Supply Air Assuming that the air handling unit provides supply air at a = qq!" + qq! + qq!" 3(801WW) = ratio ρρ of cc! TT 25% outdoor 1.2 nnnn air and 75% recirculated air, the actual box mm minimum must be! 1 nnnn = 182 LL/ss nnnn KK four times 11KK the value of Q(min,oa) above to meet the outdoor air ventilation requirements. Therefore:!" = 3(RR!PP! + RR! AA! ) 3( (0.3)(17) = = 30 LL/ss EE Qmin! 1.0 = 4(Qmin,oa ) = 250 cfm QQ!"# = 4 QQ!"#,!" = 4 30 = 120 LL/ss qq!" The!!,! = ρρheat CC! TT loss = 3 422WW from the space in the winter must also be 1.2 nnnn considered. Taking mm! 1 nnnn = 95LL/ss the nnnn exterior KK 11KK heat loss to be -8 Btu/h/ft 2 [25 QQ W/m 2 ], the heat loss on a winter night (no people/equipment, =!"# QQ!"#!!,! = qq!" + qq! + qq!" 3(801WW) ρρ CC! TT = = 2508WW 2.5kkWW lights off) ρρ cc! TT is found 1.2 to nnnn be 1440 Btu/h [422 W] per office. mm! 1 nnnn = 182 LL/ss nnnn KK 11KK Assuming a reheat supply air temperature of 95 F [35 C] and a QQ room!"#,!" = temperature 3(RR!PP! + RR! AA! ) 3( (0.3)(17) = of 75 F [24 C]: = 30 LL/ss EE! QQ!"# = 4 QQ!"#,!" qq!" QQ!"#!!,! QQ = ρρ CC! = ρρ cc TT = 4 30 = 120 LL/ss 3 422WW = 1.2 nnnn mm! 1 nnnn = 95LL/ss 1.2 nnnn mm nnnn 1 KK nnnn nnnn KK 11KK = 182 LL/ss 11KK!"!!"# Since = QQ!"#!!,! the ρρrequired CC TT = 95reheat airflow = 2508WW is = 2.5kkWW less than the minimum QQ ventilation!"#,!" = 3(RR!PP! + RR! AA! ) 3( (0.3)(17) = = 30 LL/ss airflow, EE! the reheat 1.0flow rate will need to be equal to the unoccupied night air volume to properly heat the space in the winter. QQ!"# Assuming = 4 QQ!"#,!" a = 4desired 30 = 120 heating LL/ss supply temperature of 95 F,the reheat qq capacity can be calculated as:!" QQ!"#!!,! = ρρ CC! TT = 3 422WW 1.2 nnnn mm! 1 nnnn = 95LL/ss nnnn KK 11KK qq!"!!"# = QQ!"#!!,! ρρ CC! TT = = 2508WW = 2.5kkWW Single Duct Terminal QQ!"# = qq!" + qq! + qq!" = ρρ cc! TT 3(801WW) 1.2 nnnn mm! 1 nnnn nnnn KK 11KK = 182 LL/ss *Note: metric and imperial values differ due to rounding error Then, QQ!"#,!" = determine 3(RR!PP! + RR! AA! the ) 3( minimum (0.3)(17) = outdoor = 30 LL/ss air ventilation airflow: EE! 1.0 QQ!"# = qq!" + qq! + qq!" 3(801WW) = ρρ QQ cc! TT!"# = 4 QQ!"#,!" 1.2 nnnn = 4 30 = 120 LL/ss mm! 1 nnnn = 182 LL/ss nnnn KK 11KK qq!" QQ!"#!!,! = ρρ CC! TT = 3 422WW QQ 1.2 nnnn mm! 1 nnnn 95LL/ss!"#,!" = 3(RR!PP! + RR! AA! ) 3( (0.3)(17) = EE! 1.0 nnnn KK 11KK = 30 LL/ss qq where: = QQ QQ!"# ρρ = CC 4 QQ TT!"#,!" = 95 = = = LL/ss 2508WW = 2.5kkWW Rp = the outdoor qq!" air requirement per person, 5 cfm [2.4 L/s] QQ!"#!!,! (Table = ρρ CC! 6-1, TT = 3 422WW ASHRAE Standard ). 1.2 Ra = the outdoor air nnnn mm requirement! 1 nnnn = 95LL/ss nnnn KK 11KK per ft2 of floor space, 0.06 cfm/ft 2 [0.3(L/s)/m 2 ] (Table 6-1, ASHRAE Standard qq!"!!"# = QQ ).!"#!!,! ρρ CC! TT = = 2508WW = 2.5kkWW Pz = Number of zone occupants Ez = the ventilation effectiveness, assumed to be 1.0 for a mixing system Az = (12)(15)=180 ft 2 Az = (3.7)(4.6)=17 m 2 F-64 All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2014.

22 Selection Example Single Duct Terminal Single Duct Terminal Unit Selection: The first step in selecting a single duct terminal unit is to choose the inlet or valve size. This is generally dependent on the value of both the maximum and the minimum cooling airflow for the zone. Using the Price Terminal Unit Catalog and comparing inlet valve sizes vs. air volume ranges shows that the size 6 in. (152mm) and 8 in. (203mm) are in the desired range of operation. The lowest inlet velocity that the single duct sensor can reliably and repeatedly control is based on a Vp signal of 0.02 in. w.g. (50 Pa). For an 8 in. (203mm) valve this is 132 cfm (62 L/s). This value is the lowest cfm that the terminal unit/controller assembly can reliably control, meaning that the unit minimum should be selected higher than this value to ensure the full minimum airflow is delivered to the space. Note: these lower minimum cfm values for the various inlet sizes are based on data from the manufacturer of the flow sensor. A typical lower limit for the airflow velocity that will provide a strong pressure signal is 400 fpm (2 m/s). Reheat Coil Selection: Many applications require the use of reheat coils on terminal units. These may be hot water, steam or electrical heating coils. These coils reheat the air when required to satisfy the space requirements. Selecting a Hot Water Reheat Coil: Based on the calculations above, the zone requires 8.6 MBH at a reheat airflow of 200 cfm (94 L/s). Using Price s All-In-One software (shown below), to determine the necessary coil (see below), a one-row coil flowing 0.79 gpm (0.05 L/s) will satisfy the MBH and LAT requirements for the supply air to the space. Since the calculation below is based on water at an EWT of 180 F (82 C), other fluid types and different temperatures will alter the performance selection. Additionally, the air-side and water-side pressure drops must be reviewed to ensure that the system equipment (AHU, water pump) will be able to handle them. This example results in an air-side pressure drop of 0.08 in. w.g. (20 Pa) at minimum cfm, and a water-side pressure drop of 0.4 ft. w.g. (1.2 kpa) at full fluid flow of 0.79 gpm (0.05 L/s). Typical practical limits for these parameters are 0.50 in. w.g. [124 Pa] (air-side) and 10.0 in. w.g. [2488 Pa] (water-side), and this performance selection is well within those limits. Selecting a Hot Water Reheat Coil Selecting an Electric Reheat Coil: The previous calculations have determined that 2.5 kw of reheat is required from the electric heater. In order to select this heater, two additional parameters must be known: the input voltage/phase to the heater, and the control method. If a single-stage heater of 480 volt, three-phase input power is assumed, the following calculations can be made in the AIO software. Selecting an Electric Reheat Coil A limiting factor in electric coil selection can be the current draw of the heater, which can be calculated as: This agrees with the data in the example above. Generally, special considerations are required when coils draw more than 48 amps. An additional point to consider: electric coils have a minimum flow requirement of 70 cfm/kw (33 L/s per kw). Failure to do so may result in hot spots along the coil, where repeated overheating may lead to thermal fatigue and eventual coil failure. Copyright Price Industries Limited All Metric dimensions ( ) are soft conversion. F-65