PC-125x Counter-Balanced Backdraft Damper Product Bulletin - PDF document

PC-125x Counter-Balanced Backdraft Damper Product Bulletin 1 Refer to the QuickLIT Web site for the most up-to-date version of this document.Since 1885, Johnson Controls has developed and refined air control products by providing the highest quality control dampers that fit your application and size requirements. Now we are including counter-balanced backdraft dampers in our product offering.•PC-1250 Counterbalanced Backdraft DamperSynthetic bearings•PC-1251 Counterbalanced Backdraft DamperMedium velocityPC-1252 Counterbalanced Backdraft DamperZytel bearingsAll three counter-balanced backdraft dampers feature zinc-plated weights. Figure 1: PC-125x Counterbalanced Backdraft Dampers Table 1: Features and BenefitsFeaturesBenefits3-Year Warranty on Materials and WorkmanshipProvides confidence in company-backed products.15 to 25 Working-Day Standard Shipping after Order EntryResults in fast response for short lead time projects. PC-125x Counter-Balanced Backdraft DamperCode No. LIT-12011820Issued April 27, 2015 PC-125x Counter-Balanced Backdraft Damper Product Bulletin Construction Sample SpecificationFurnish and install, at locations shown on plans or in accordance with schedules, counter-balanced backdraft control dampers meeting the following minimum construction standards:•Damper frame must be minimum .090 in. (2.3 mm) minimum wall thickness, 6063-T5 extruded aluminum with 12 gauge galvanized steel structural brace at each corner.•Blades shall be .025 in. (.6 mm) minimum roll-formed aluminum with extruded vinyl blade edge seals mechanically locked into blade edge. Adhesive or clip on type seals are unacceptable. Blades shall include field adjustable, zinc-plated, steel counter-balance weights to allow pressure relief at less at .01 in. wg.•Bearings must be corrosive resistant, long life synthetic type for quiet operation.•Linkage must be 1/2 in. (13 mm) wide tie bar, concealed in the frame.•Dampers must be designed for maximum 1500 fpm spot velocities and up to 4 in. wg back pressure, depending on damper size. Dampers shall be in all respects equivalent to Johnson Controls PC-1250 damper.•Submittal data must include published leakage, pressure drop, and maximum pressure data based on Air Movement and Control Association International (AMCA) Standard 500 testing. Data must cover a full range of damper sizes; data from one size sample is not acceptable.Table 2: MaterialsPartMaterialsFramePC-1250: 2 x 1 in. 6063-T5 extruded aluminum, .090 in. (2.3 mm) wall thickness, mitered cornersPC-1251: 4 x 1 in. 6063-T5 extruded aluminum, .081 in. (2.1 mm) nominal wall PC-1252: 2-1/4 x 1 in. 6063-T5 extruded aluminum, .125 in. (3.2 mm) wall thicknessBladePC-1250: 0.025 in (.6 mm) formed aluminum with extruded vinyl edge sealsPC-1251 and PC-1252: 6063-T5 extruded aluminum, 0.70 in. (1.8 mm) wall thickness with extruded vinyl edgeCounterbalanceZinc-plated weights on blades. Adjustable for final on the job settings.LinkageBearingsPC-1250: SyntheticPC-1251: Dust proof, ball bearings pressed PC-1252:FinishMill galvanized PC-125x Counter-Balanced Backdraft Damper Product Bulletin3 Damper Dimensions Figure 2: PC-1250 DamperDimensions, in. (mm) FRAME CONSTRUCTION Channel FrontFlange (51) 1 1/2 (38) Typ. A x B (51)Air Flow 3 (76)(51) VERTICAL MOUNTHORIZONTAL AIR FLOW IG: PC1250dims.de s Figure 3: PC-1251 DamperDimensions, in. (mm) FRAME CONSTRUCTION Channel FrontFlange2 1/4" (57) 1 1/4" (32) Typ. A x B Width 2 1/4"(57)Air Flow4 1/8"(105) 3 3/8" (86) VERTICAL MOUNTHORIZONTAL AIR FLOW Figure 4: PC-1251 DamperDimensions, in. (mm) VERTICAL MOUNTHORIZONTALAIR FLOW2 3/4(70)Max.3 1/2(89)Max. 1 1/2" (38) 1" (25)A* x B*STANDARDFLANGE (optional atadditional cost)FRAME CONSTRUCTIONS PC-125x Counter-Balanced Backdraft Damper Product Bulletin Performance CurvesPerformance curves are based on AMCA Standard 500 using test setup apparatus figure 5.3 (damper installed with duct upstream and downstream). Static pressure and cubic feet per minute (cfm) are corrected to .075 lb/cu. ft air density.Leakage and PressureDampers may tolerate higher pressures and velocities than those listed in Table3, Table4, and Table5. Conservative ratings are presented intentionally in an effort to avoid misapplication. Consult a JohnsonControls® representative when a damper is to be applied in conditions exceeding recommended maximums. Table 3: Performance Data for PC-1250 ModelDamper Width, System Pressure - External Wind Velocity (in.wg)Maximum System Velocity (fpm)Leakage% of Maximum Total sq. ft/cfm40 (1,016)55 mph/1.5 in. wg1,0001.515.036 (914)70 mph/2.5 in. wg1,0001.515.024 (610)85 mph/3.5 in. wg1,0002.020.012 (305)95 mph/4.5 in. wg1,0004.040.01.Based on pressure differential of 1 in. wg Table 4: Performance Data for PC-1251 ModelDamper Width, in. (mm)Maximum Back System Pressure (in.wg)Maximum System Velocity(fpm)LeakageBlades Start to OpenOpenMaximum Total sq. ft/cfm48 (1,219)4.0 in. wg2,5000.717.5.02 in. wg.05 in. wg36 (914)8.0 in. wg2,5000.82024 (61012.0 in. wg2,5000.92312 (305)16.0 in. wg2,50001.6401.Based on pressure differential of 1 in. wg Table 5: Performance Data for PC-1252 ModelDamper Width, in. (mm)Maximum Back System Pressure (in.wg)Maximum System Velocity(fpm)LeakageBlades Start to OpenOpenMaximum Total sq. ft/cfm48 (1,219)4.0 in. wg2,5000.615.01 in. wg.05 in. wg36 (914)8.0 in. wg2,5000.61524 (61012.0 in. wg2,5000.717.512 (305)16.0 in. wg2,5001.0251.Based on pressure differential of 1 in. wg PC-125x Counter-Balanced Backdraft Damper Product Bulletin5 Figure 4 shows the air leakage when the PC-1251 damper is closed. Figure 5 shows the pressure drop for PC-1251 and PC-1252 damper models. Note:Ratings are based on AMCA Standard 500 using Test Setup Apparatus Figure 5.3 (damper is installed with ducts upstream and downstream). Static pressure and conversion velocities are corrected to 0.075 lb/cu. ft air density. Figure 5: PC-1251 Air Leakage (When Damper Closed) Figure 6: Pressure Drop Chart (24 x 24 in.) for Models PC-1251 and PC-1252 Figure 7: Counter-Balanced Backdraft Damper Air Flow by Damper Model Air Flow Horizontal Mount - Air Flow DOWNAir Flow Horizontal Mount - Air Flow UP PC-1252 Air FlowAir Flow Horizontal Mount - Air Flow UPHorizontal Mount - Air Flow DOWNHorizontal Mount - Air Flow DOWN PC-1251 Air Flow Horizontal Mount - Air Flow DOWNAir Flow Horizontal Mount - Air Flow UPPC-1250 IG: upflw.des PC-125x Counter-Balanced Backdraft Damper Product Bulletin Maximum Single Panel Sizes Table 6: PC-125x Industrial DampersCode Number/Character FIELD123456789101112131415 Product Family = Backdraft/Pressure Relief Blade Operation = Counter-Balanced Blade Type = High Pressure (PC-1252)= Low Pressure (PC-1250) = Medium Pressure (PC-1251) Bearing/Seal Type= See Table2. Actuator Type = Normal Width DimensionsALL = 006 through 099 inches1inch increments Height Dimensions PC-1250 = 007 through 099 inches = 011 through 099 inches = 010 through 099 inches1inch increments Options(Limit 2) = Exact Size = Front Flange (Air Leaving Side) = Rear Flange (Air Entering Side) = Upward Flow Ordering Code Number P wxhhh-- Table 7: Maximum Single Panel SizesDamper ModelMaximum Selection Size40 W x 48 in. H (1,016 x 1,219 mm)48 W x 52 in. H (1,219 x 1,321 mm)48 W x 52 in. H (1,219 x 1,321 mm) Published in U.S.A.www.johnsoncontrols.comPC-125x Counter-Balanced Backdraft Damper Product Bulletin Metasys® and Johnson Controls® are registered trademarks of Johnson Controls, Inc.All other marks herein are the marks of their respective owners. © 2015 Johnson Controls, Inc.Building Efficiency507 E. Michigan Street, Milwaukee, WI 53202 InstallationItems Needed•nut driver, 5/16 inch socket•hammer•hole saw, 1-1/4 inch•drill bit, 3/16 inch •drill•No. 12 self-tapping or No. 10-24 machine screws1.Install with frame square. Do not twist or rack the frame square. Use shims between the damper frame and the opening or duct to prevent distortion of the frame square.2.Multiple section assemblies must be fastened together on the top, bottom, and all sides. Use appropriate bracing at every horizontal mullion and vertical bracing every 8 feet of damper width.3.To complete the operation, position blade counter balance weights to set the desired blade opening 4.For fan discharge applications, locate the damper at least half the fan diameter from fan discharge. Isolation from excessive fan vibration is recommended.Technical SpecificationsThe performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication and misuse of its products.PC-125x Counter-Balanced Backdraft DampersMaximum System PressurePC-1250See Figure3.PC-1251See Figure4.PC-1252See Figure5.Maximum System VelocityPC-12501,000 feet per minute (305 m per minute)PC-1251 and PC-12522,500 feet per minute (762 m per minute)Maximum Temperature-40°F (-40°C) minimum and 200°F (93°C) maximumShipping WeightPC-125037.9 lb/sq. ft (17.2 kg/sq. ft)PC-125138.2 lb/sq. ft (17.3 kg/sq. ft)PC-125239.1 lb/sq. ft (17.7 kg/sq .ft)