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Bulletin 20-20.1 — Page 3Blower Module Specifications – 60 HzModel No. MB2430L MB3642L MB4860LElectrical Characteristics208 – 230 Volts / 60 / 1 phaseSize, HP (kW) 1/2 (0.37) 1 (0.75) 1 (0.75)Full Load Amps 3.0 6.2 6.2MotorMinimum Circuit Ampacity 3.8 8.0 8.0Maximum Overcurrent Protection 15 15 15Capacitor, mfd. 10 10 10Speed, RPML model 1700 1700 1700L+CB model 1700/800 1700/800 1700/800Blower Wheel Nom. Diameter, in. (mm) 9.5 (241) 9.5 (241) 9.5 (241)Blower Wheel Width, inch (mm) 3.75 (95) 5.0 (127) 7.75 (197)Nominal* Air Flow Rate, cfm (L/s) 600 (283) 1000 (472) 1250 (590)Plenum Static Pressure, iwc, (Pa) 1.5 (373) 1.5 (373) 1.5 (373)Sound Pressure LeveldB(A) 56 56 58NC 50 47 50Minimum Plenum Size, ID, inch (mm) 7 (178) 9 (229) 10 (254)Shipping Weight, lb (kg) 62 (28) 72 (33) 72 (33)A 25 (635) 38 (965) 38 (965)Dimensions, in. (mm)B 6.00 (152) 7.16 (182) 10.13 (257)C 6.38 (162) 6.38 (162) 6.38 (162)D 23 (584) 36 (914) 36 (914)ALATCHCATCHTOP VIEWCONTROLBOX9.55(243)4.29(109)7.55(192)RESTRICTORPLATEOUTLETOPENING(FULL)C10(254)KNOCKOUTS(ALTERNATECONTROL BOXLOCATION)INLETOPENING17-1/2(445)15-1/2(394)x'D' WidthAIR FLOWB13-3/4 (349)1 (25)FRONT VIEWPLENUM ADAPTERSOLD SEPARATELYSIDE VIEWIL00020B.CNVALL DIMENSIONS IN INCHES (mm)© Copyright 2007 Unico, Inc.

Bulletin 20-20.1 — Page 4* based on full open restrictor and minimum plenum size at 230V.** NC=noise criteriaAcoustical DataSound is always present in our lives and is important tocomfort. Understanding how sound is defined is essentialto understanding how to design a proper Unico System.Sound is defined as a physical disturbance in pressure thatis detectable by the human ear. Sound is usually presentedas Sound Pressure Level (SPL) in decibels (dB), but canalso be presented as Sound Power Level (SWL). Soundpressure is what you hear so it is the only value that isimportant to the occupant. However, determining thevalue is difficult because it is dependent on thesurroundings and distance from the sound source. Forinstance, a carpeted room is much quieter than a roomwith wood floors.For the Unico System, it is also important to considersound transmission losses through ceilings and walls. Theblower is never placed in the occupied room so the soundis always less than the published value. This reduction insound level depends on the construction of the ceiling orwall. For instance, a ceiling structure made of gypsumboard with insulation above it will have a much greatersound transmission loss (TL) than a dropped ceilingwithout insulation.The data shown in this catalog was measured in a largeroom with hard surfaces for the walls and floor. It isconsidered to be the worst case (i.e. loudest) situation.The sound level in the occupied space will always beconsiderably less than this, depending on where the unitis located. To determine the actual sound level, subtractthe TL for the barrier from the sound data of the unit. Thetable below shows typical TL values for commonconstruction configurations. Subtract these values fromthe Unico air handler data.Transmission Loss for Common Construction, dBFrequency, Hz 125 250 500 1k 2k 4k RSheet Metal, 24 ga 13 17 20 27 34 39 18Ceiling Tile, mineral fiber 13 21 27 31 35 40 20Gypsum Frame wall 12 23 31 38 42 37 20Gypsum Frame wall, insul. 15 30 32 43 46 38 23Wood Floor, uninsulated 22 28 37 43 46 43 25Wood Floor, insulated 29 40 51 57 60 58 26Concrete Block, 190-mm 38 41 43 50 55 61 26Concrete, 100-mm (4 in.) 41 41 45 52 56 64 26Ref: Handbook of Acoustical Measurements and Noise Control, 1998R = Overall Loss for typical Blower Module (based on MB4260H-50HZ)For example, if a MB2430L operating at 50 Hz is locatedabove a dropped ceiling, the noise level in the room willbe reduced 20 dB, from 52 to 32 dBA, making the UnicoSystem one of the quietest systems on the market.Similarly, if the same unit is installed in an attic withinsulation, the sound level will only be 29 dB in the room.Sound Pressure Level, dB re 20 μPaSound Pressure Level, dB re 20 μPaSound Pressure Level, dB re 20 μPa90807060504030201031.590807060504030201031.590807060504030201031.563636350 Hz60 Hz12550 Hz60 Hz12550 Hz60 Hz125Measured 3 ft. (1 m) from unit(side opposite control box)21 ft. x 35 ft. lab (school classroom).Tested 9/12/2002 and 2/26/20042505001k2kOctave Band Center Frequency, HzMeasured 3 ft. (1 m) from unit(side opposite control box)21 ft. x 35 ft. lab (school classroom).Tested 9/12/2002 and 2/26/20042505001k2kOctave Band Center Frequency, HzMeasured 3 ft. (1 m) from unit(side opposite control box)21 ft. x 35 ft. lab (school classroom).Tested 9/12/2002 and 2/26/20042505001k2kOctave Band Center Frequency, HzMB2430L600 CFM(280 L/s)4k8k1000 CFM(472 L/s)4kNC-60NC-55NC-50NC-45NC-40NC-35NC-30NC-25MB3642L8k1250 CFM(590 L/s)4kNC-60NC-55NC-50NC-45NC-40NC-35NC-30NC-25MB4860L8kNC-60NC-55NC-50NC-45NC-40NC-35NC-30NC-25© Copyright 2007 Unico, Inc.

Bulletin 20-20.1 — Page 5AirWheel: FC950-500DHousing: 950MMotor: 1 HP, 1700 RPM, (Dayton 9MTV8)Equip: MB3642L+MC3642CSupply: 9" sheet metal duct (see photo)Return: 18" return duct with filter grilleTemperature: 82°F dry bulb, 55% RHL/s0 50 100 150 200 250 300 350 400 450 500 550 600 6501900MB3642L60Hz1800RPM1700230V1600208V150012003 ft. (1 m)1000800Watts600Microphone400230V200208V6Note: Using a muffler made of 10-inch (250 mm)diameter × 20-inch (500 mm) long metal duct and linedwith 1.5-inch (38 mm) or fiberglass insulation will reducesound pressure by 3 dB.Amps543213.0230V208V700Blower Capacity DataStatic Pressure, in. wc2.56002.05004001.5300230V1.0200208V0.5 Supply Static Pressure1009-inch Sheet Metal Duct0.000 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400Airflow, CFM0241Graph409/18/2002Tested by: J.RileyApproved by: C. MessmerPaRPM18001700160015001400700Wheel: FC950-375DHousing: 950MMotor: 1/2 HP, 1700 RPM, (Dayton 9MTV7)Equip: MB2430L+MC2436C-ASupply: 7" fiberglass duct, straight to 1 tee, horseshoeReturn: 14" return duct with filter grilleTemperature: 34°F dry bulb, 85% RH0 50 100 150 200 250 300 350 400L/sMB2430L60Hz208V230VRPMWheel: FC950-775DHousing: 950MMotor: 1 HP, 1650 RPM, (Dayton Model 9MTV8)Equip: MB4860L+MC4860CSupply: 10" sheet metal duct reduced to 9" to tee (see photo)Return: 20" return duct with filter grilleTemperature: 75°F dry bulb, 45% RHL/s0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750180017001600MB4860L60Hz230V208V6005001500Watts400300230V1000800208V-230V200208VWatts600100400208VAmps32230V20065208V230V1Amps43.07003Static Pressure, in. wc2.56002.05004001.5230V3001.0208V2000.57-inch Rigid Round Supply Duct1000.000 100 200 300 400 500 600 700 800 900Airflow, CFMR0201-R0202Graph101/24/2002Tested by: Seden KalyoncuApproved by: C. MessmerPaStatic Pressure, in. wc23.07002.56002.05004001.5230V 3001.02000.5208V10010-inch Sheet Metal Duct0.000 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600Airflow, CFM0246Graph309/30/2002Tested by: J.RileyApproved by: C. MessmerPa© Copyright 2007 Unico, Inc.

Bulletin 20-20.1 — Page 62000Wheel: Revcor FC950-375DHousing: Revcor 950MMotor: 1/2 HP, 1700 RPM, Dayton A19843Equip: MB2430L, MC2430C-ASupply: 7" sheet metal duct to 9" sheet metal, straight to 1 tee, horse shoeReturn: 14" with filter across the duct opening (no grille)Temperature: 70°F, 35% RHL/sMB2430L+CB60 Hz208-230V0 50 100 150 200 250 300 350MB3642L+CBWheel: GR950-500DHousing: 800 seriesMotor: 1 HP, 1700 RPM, (Dayton 9MTV8)Equip: MB3642L+MC3642C + CB60 HzSupply: 9" horseshoe sheet metal duct with 9" supply ductReturn: 18" return duct208-230VTemperature: 71°F dry bulb, 28% RHL/s0 50 100 150 200 250 300 350 400 450 500 550 600 650200017501500High Speed230V208V17501500High Speed230V208VRPM12501000750Low SpeedRPM12501000750Low Speed5006005001200500High Speed1000High Speed400800Watts3002001003.0208V230VLow SpeedWatts60040020006208V230VLow Speed2.52.0High Speed208V230V54High Speed208V230VAmps1.5Amps31.0Low Speed2Low SpeedStatic Pressure, in. wc0.52.52.01.51.00.5Low SpeedHigh Speed600500400300200100PaStatic Pressure, in. wc13.53.02.52.01.51.00.5Low SpeedHigh Speed900800700600500400300200100Pa0.000 100 200 300 400 500 600 700 800Airflow, CFM0333Graph1001/09/2004Tested by: J. RileyApproved by: C. Messmer0.000 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400Airflow, CFMReport 0502, 50 & 60 Hz, High & Low SpeedWhiteBook02/24/2005Tested by: T. SavoyApproved by: C. Messmer2000Wheel: Revcor FC950-775Housing: Revcor 950MMotor: Emerson K55BWKRF-0491Equip: MB4860L + MC4860C + UPC-04-4860Supply: 10" sheet metal duct, straight to 1 tee, horse shoeReturn: 18" return duct with filter grilleTemperature: 59.5°F, 30.4% RH, 30.67 in HgL/sMB4860L+CB60 Hz208-230V0 50 100 150 200 250 300 350 400 450 500 550 600 650 70017501500High Speed208V230VRPM1250100075012001000800Low SpeedHigh Speed230VWatts600400208V200Low Speed6Amps543High Speed230V208V2Low Speed3.0700Static Pressure, in. wc2.52.01.51.00.5Supply Duct SPLow SpeedHigh Speed230V208V600500400300200100Pa0.000 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500CONFIDENTIALAirflow, CFMProperty of Unico, Inc.Do not copy or distributewithout permission.R0602Graph203/31/2006Tested by: E. ShapiroApproved by: C. Messmer© Copyright 2007 Unico, Inc.