MAJAX-2 GENERAL SPECIFICATION Majax-2 axial flow fans are manufactured in diameters ranging from 315mm to 2000mm (available in 2250mm on request), and incorporate manually adjustable pitch aluminium bladed impellers. The following configurations are available: - Direct driven units with the impellers attached directly onto the shafts of totally enclosed motors mounted directly in the airstream. - Belt-driven units with the motors mounted out of the airstream on the outside of the fan casings. - Bifurcated units with motors mounted in bifurcations, out of the airstream. - BELLAX fans with impellers attached directly onto the shafts of totally enclosed motors and mounted on fibreglass plates with bell shaped entries. - Majax-2 Plate mounted with the impellers attached directly onto the shafts of totally enclosed motors and mounted on carbon steel plates. - Vertical jet, roof mounted extraction units, available in two ranges (HVJ-2 & HVJ-2S). See roof unit brochure for further information. APPLICATIONS This range of fans is ideally suited for moving large volumes of air against low and medium pressures in the following applications: - General ventilation: kitchen canopies, supermarkets, airport buildings, underground car parks, stairwell pressurization, gymnasiums and stadium cloak rooms, industrial buildings, etc. - Air-conditioning. - Smoke control and exhausting heat from buildings. - Condenser cooling. - Cooling towers. Combinations of motor speeds, impeller blade pitch settings, and the number of blades per impeller (full and half solidity), provide flexibility in terms of selection. Fans offering good efficiencies can be selected over a range of volumes from 0,1m 3 /s to 85m 3 /s at total pressures up to 1,0 kpa. S The MAJAX-2 range is available in the following sizes: - Standard direct drive fans in 12 sizes: from 315mm to 2000mm (available in 2250mm on request). - Standard belt drive fans in 11 sizes: from 400mm to 2000mm. - Bifurcated fans in 7 sizes: from 400mm to 1250mm. - BELLAX in 7 sizes: from 315mm to 1000mm. - Plate mounted axial fans in 8 sizes: from 400mm to 1000mm. - Vertical jet roof units: HVJ-2 in 3 sizes from 630mm to 1000mm. HVJ-2S in 7 sizes from 400mm to 900mm. IMPELLER FINISH Majax-2 315-1000 and 1250-F hubs are electro-coated, Majax-2 1250H hubs are aluminium cast, Majax-2 1600 to 2250 hubs are fabricated and hot dip galvanised. Aluminium surface finishes are left natural. All fasteners are zinc plated. BALANCING Impellers are dynamically balanced to ISO 1940 grade G6,3. CASINGS - DIRECT DRIVE Standard casing lengths (SL) usually cover the impeller and motor assemblies. External terminal boxes are provided on the casings of fans fitted with standard totally enclosed motors (see brochure for connection details). Where flame-proof motors are fitted, a length of armoured cable, which passes through the fan casing, is connected to the motor. The free ends of these cables are to be connected to fittings appropriate to the installation. Smoke extraction fans are fitted with external, certified terminal boxes and conduit for the selected application. Casings incorporate viewing ports unless access panels are provided. CASINGS - BELT DRIVE Standard casing lengths cover the overall length of the impeller and belt drive assemblies. Generally, motors would not project beyond the casing flanges. Standard belt drive fans incorporate casing access panels. FLANGE DIMENSIONS AND DRILLINGS Flange dimensions and drillings are in accordance with BS 6339. See brochure for details. CASING FINISH Casings are hot-dip galvanized to ISO 1461. All fasteners are zinc plated. Sizes vary in accordance with the preferred increments covered in ISO 497-1973 (E) R20. The sizes are: 315, 400,, 560, 630, 710, 800, 900, 1000, 1250, 1600, 2000 and 2250. IMPELLERS Impellers incorporate die-cast aluminium alloy blades of aerofoil section, which are clamped in split steel hubs (Majax-2 1250H impellers have split aluminium cast hubs). Blade pitch adjustment is achieved by slackening the hub clamping bolts and setting the blades to the required pitch prior to re-tensioning the clamp bolts.
MOTORS Up to frame size 160, pad mounted motors are used in most direct driven fans. For all other applications foot mounted motors are used. Both pad and foot mounted motors are totally enclosed. Minimum protection is IP55 for pad and foot mounted motors. Standard motors have Class F insulation. Standard voltages are 400 volt three phase and 220/230 volt single phase, 50Hz. Electrical performance complies with IEC 34. Motors with non-standard classes of insulation, special grease for high/low temperature operation, flameproof construction, special voltages, multi-speed, etc., may be available on application. MOTOR SUPPORTS Direct driven fans up to size 1000, driven by pad mounted motors up to frame 132, have motors mounted in plates suspended in rubber mountings to minimize noise and vibration. All other pad mounted motors are mounted by means of support rods. Belt driven fans utilize foot mounted motors fitted to motor supports mounted externally on the fan casings. DIRECTION OF AIR FLOW Forms B, BD and BU are standard arrangements for direct drive fans, having motors mounted downstream of the fan impellers. A B Forms A, AD and AU are standard arrangements for belt drive fans, having the bearing and drive assemblies mounted upstream of the fan impellers. These forms can also be used on direct drive fans. Mechanical details and bearing selections on all MAJAX-2 fans, whether direct or belt drive, are suitable for any of these attitudes. However, impellers require changing from Form A to Form B running. BEARING LIFE (0) Direct driven 2 pole units are designed to have a 20 000 hour statistical bearing life, and 4,6 and 8 pole units are designed to have a 40 000 hour statistical bearing life. Belt driven units are designed to have a statistical 40 000 hour bearing life. TEMPERATURE LIMITATIONS MAJAX-2 fans are suitable for operating within the following temperature ranges: - Standard direct drive fans: - 20 C to + 50 C. - Standard belt drive fans: - 10 C to + 50 C. - Bifurcated fans: - 20 C to + 200 C. - BELLAX: - 20 C to + 50 C. Impellers from to 1000 have been successfully tested in accordance with BS 7346 : Part 2: 1990 at 300 C for 2 hours. Impeller diameter 1600 has been successfully tested in accordance with BS 7346: Part 2: 1990 at 300 C for 1 hour. MOISTURE TREATMENT Standard fans are suitable for continuous operation in relative humidities up to 95%. Special treatment of fans is available to render them suitable for continuous operation in moisture laden atmospheres. This treatment involves additional mechanical and electrical sealing procedures. AD BD AU BU PERFORMANCE All performance data is based on tests carried out in accordance with BS 848: Part 1 - Test method No. 1. Ratings are based on standard air density of 1,20kg/m 3 corresponding to an air temperature of 20 C, a barometric pressure of 101,325 kpa and a relative humidity of 62%. Power values given reflect fan shaft power without provision for drive losses. SOUND DATA The sound data indicated on the performance graphs are "In-duct" values obtained from tests conducted in accordance with BS 848: Part 2 - In-duct method. The higher values on the Sound Level contours are Overall Sound Power Levels (suffixed dbw), and the lower values are Average Sound Pressure Levels, under free field conditions, at a distance of 3 impeller diameters from the fan inlet or outlet. Sound Power Levels are given in decibels re: 10-12 Watts. Sound Pressure Levels are given in decibels re: 2 x 10-5 Pa. An octave band analysis can be obtained by subtracting the spectrum constants, tabulated on each performance graph, from the Overall Sound Levels. A-Scale levels are obtained by subtracting an A-Scale correction constant, given on each performance graph, from the Overall Sound Level. "Free-field" sound levels incorporating inlet/outlet end reflection losses, are obtained by subtracting the following constants from the "In-duct" Octave Band Sound Levels. OCTAVE BAND MEAN FREQUENCY 1000 & 63 125 250 ABOVE 315 14 9 5 2 0 400 13 8 3 1 0 11 6 2 0 0 560 10 5 2 0 0 630 9 5 1 0 0 800 7 3 1 0 0 1000 6 1 0 0 0 1250 5 1 0 0 0 1600 3 0 0 0 0 2000 2 0 0 0 0 REVERSAL OF AIR FLOW The direction of air flow of a standard impeller can be reversed by changing the direction of fan rotation. Equal volume flow in either direction can be provided by means of special blade adjustments. The approximate resultant fan performance for the above conditions when compared with standard fan performance is as follows: STANDARD IMPELLER REVERSIBLE IMPELLER Volume Reduction 30% 15% Pressure Reduction 55% 25% Power Reduction 25% 20% OPTIONAL FEATURES Mounting feet, counter flanges, wire screens, conical inlets, antivibration mountings, casing access panels & flexible connections. Hand, motor or airstream operated dampers. Cylindrical attenuators of matching sizes. Non-standard casing lengths & special protective coatings. Belt guards & belt fairings (belt drive fans). All technical information contained herein is subject to change without prior notice.
DIRECT DRIVE BELT DRIVE Mass Mass SPEED (rpm) - MOTOR POWER (kw) MOTOR POWER B C D F G H I J K L A 2 POLE 4 POLE 6 POLE 8 POLE (kw) 315 0.25 to 0.75 0.08 to 0.55 0.06 to 0.55 - - 315 355 380 8 11 - - 22 27-0.55 to 2.2 0.18 to 0.55 0.12 to 0.55-0.25 to 0.75 400 512 22 38 51 400 - - - 1.1 to 1.5-450 485 8 13 585 - - 60 - - - 2.2 to 4.0-627 - - 91 0.75 to 2.2 0.18 to 1.5 0.12 to o.55-0.25 to 0.75 400 573 22 47 62 3.0 to 4.0 - - - 1.1 to 1.5 400 626 22 75 71 560 607 12 13 - - - - 2.2 to 4.0-688 - - 103 - - - - 5.5 to 7.5-725 - - 135 1.1 to 2.2 0.37 to 1.5 0.12 to 0.55-0.25 to 0.75 400 627 22 44 67 3.0 to 4.0 - - - 1.1 to 1.5 400 680 22 79 76 560 5.5 to 7.5 - - - 2.2 to 4.0 620 667 12 13 722 22 110 108 - - - - 5.5 to 7.5-759 - - 139 - - - - 11.0 to 15.0-874 740 - - 246-0.37 to 1.5 0.12 to 1.1-0.25 to 0.75 400 666 22 47 71 630 3.0 to 4.0 2.2 to 3.0 - - 1.1 to 1.5 400 718 22 81 80 690 737 12 13 5.5 to 7.5 - - - 2.2 to 4.0 761 22 116 112 11.0 - - - 5.5 to 7.5 630 798 34 167 145-0.55 to 1.5 0.55 to 1.2 0.27 0.55 to 0.75 400 689 22 54 75 710-2.2 to 4.0 1.5 to 2.2 0.75 to 1.5 1.1 to 1.5 400 742 22 89 84 770 817 16 13-5.5 to 7.5 3.0 to 5.5-2.2 to 4.0 804 22 123 116 - - - - 5.5 to 7.5-841 - - 149-0.75 to 1.5 0.55 to 1.1 0.27 0.75 400 737 22 64 87 800-2.2 to 4.0 1.5 to 2.2 0.75 to 1.5 1.1 to 1.5 400 790 22 98 95 860 907 16 13-5.5 to 7.5 3.0-2.2 to 4.0 852 22 132 129-11.0 - - 5.5 to 7.5 710 889 34 223 161-1.1 to 1.5 0.55 to 1.1-0.75 400 810 22 86 110 900-2.2 to 4.0 1.5 to 2.2 0.75 to 1.5 1.1 to 1.5 400 863 22 123 120-5.5 to 7.5 3.0 to 5.5 2.2 to 3.0 2.2 to 4.0 970 1039 16 13 905 22 160 152-11.0 to 15.0 - - 5.5 to 7.5 630 942 34 233 184 - - - - 11.0 to 15.0-1066 740 - - 324 - - 1.1-1.1 to 1.5 400 915 22 94 131-3.0 to 4.0 1.5 to 2.2 0.75 to 1.5 2.2 to 4.0 400 957 22 133 164-5.5 to 7.5 3.0 to 5.5 2.2 to 3.0 5.5 to 7.5 560 994 22 180 194 1000-11.0 to 15.0 7.5 to 11.0 4.0 11.0 to 15.0 770 1070 1141 16 15 1119 740 34 279 362-18.5 to 22.0 - - 18.5 to 22.0 770 1159 740 34 337 412 - - - - 30.0-1172 990 - - 573 - - - - 37.0-1238 990 - - 670 - - 3.0 to 5.5-5.5 to 7.5 560 1172 710 22 300 330-11.0 to 15.0 7.5 to 11.0-11.0 to 15.0 800 1250 800 34 420 454-18.5 to 22.0 15.0-18.5 to 22.0 800 1290 800 34 480 513 1250 H - 30.0 18.5 to 22.0-30.0 850 1320 1392 20 15 1312 850 42 540 612-37.0 to 45.0 30.0-37.0 to 45.0 1000 1378 850-670 704-55.0 to 75.0 - - 55.0 to 75.0 1000 1514 1000-879 1101-90.0 - - - 1120 - - - 1112 - - - 2.2 1.1 to 1.5-560 - - 22 195-1250 F - - 3.0 to 5.5 2.2 to 3.0-560 - - 22 243 - - - 7.5 to 11.0 4.0 to 7.5-800 1320 1392 20 15 - - 34 363 - - - 15.0 11.0-800 - - 34 418 - - - 18.5 to 22.0 - - 850 - - 42 478 - All technical information contained herein is subject to change without prior notice.
DIRECT DRIVE BELT DRIVE Mass Mass SPEED (rpm) - MOTOR POWER (kw) MOTOR POWER B C D F G H I J K L A 2 POLE 4 POLE 6 POLE 8 POLE (kw) - - 11 4.0 to 7.5 5.5 to 7.5 740 1350 740 34 514 431 - - 15.0 11.0 11.0 to 15.0 740 1431 990 34 572 616 1600 - - 18.5 to 22.0 15.0 15.0 to 22.0 990 1471 990 42 708 672 1680 1743 24 19 - - 30.0 18.5 to 22.0 30.0 1190 1 990-905 779 - - 37.0 to 45.0 30.0 to 37.0 37.0 to 45.0 1190 1566 990-1072 867 - - 55.0 to 75.0-55.0 to 75.0 1490 1704 1190-1313 1280 - - - 11.0 18.5 to 22.0 740 1670 990 34 737 841 - - - 15.0 30.0 990 1704 990 42 883 958 - - - 18.5 to 22.0 37.0 to 45.0 1190 1770 990-1127 1045 2080 2173 24 19 2000 - - - 30.0 to 37.0 55.0 to 75.0 1190 1914 1190-1274 1480 - - - 45.0 to 55.0 90.0 to 110.0 1490 1968 1190-1593 1792 - - - 75.0-1490 - - - 1806 - C D E F MASS 315 355 320 8 11 1.52 400 450 405 8 13 2.64 560 507 12 13 4.12 560 620 567 12 13 4.56 630 690 637 12 13 5.08 710 770 717 16 13 5.68 800 860 807 16 13 12.68 900 970 909 16 13 18.28 1000 1070 1011 16 15 20.7 1250 1320 1262 20 15 25.52 1600 1680 1613 24 19 32.28 2000 2080 2013 24 19 49.56 (ØA) BS MASS 315 120 1.60 400 120 2.77 120 4.33 560 120 4.79 630 120 5.33 710 120 5.96 800 120 13.31 900 120 19.19 1000 120 21.74 1250 160 26.80 1600 160 33.89 2000 160 52.04 C D E MASS P Q R (ØA) KG 315 56 422 372 3.99 400 71 524 474 6.09 90 648 598 9.11 560 100 720 670 10.39 630 112 804 754 12.04 710 125 905 855 15.38 800 140 1006 956 17.85 900 162 1170 1090 31.18 1000 181 1286 1206 35.67 1250 224 1603 1503 50.41 1600 280 2050 1920 89.09 2000 355 2537 2407 142.22 IVC dimensions available on request (ØA) S MASS 315 220 13 400 260 18 300 25 560 310 29 630 345 34 710 385 48 800 430 58 900 480 85 1000 530 102 1250 655 157 1600 830 340 2000 1030 421 T U V W X Y MASS 315 35 20 11 125 140 240 0.41 400 40 22 13 162 180 285 0.59 40 22 13 232 250 355 1.28 560 39 22 13 232 250 385 1.91 630 39 22 13 262 280 420 2.20 710 39 22 13 282 300 465 2.21 800 39 22 13 332 350 518 3.81 900 54 30 15 355 380 595 4.86 1000 59 35 15 385 410 653 7.59 1250 60 35 15 525 555 812 13.05 1600 75 40 19 590 625 1035 20.54 2000 75 40 19 790 825 1234 29.19 All technical information contained herein is subject to change without prior notice.
Majax-2 (2 Pole - 2880 r/min Performance Curves) Majax-2 (4 Pole - 1440 r/min Performance Curves)
Majax-2 (6 Pole - 960 r/min Performance Curves) Majax-2 (8 Pole - 720 r/min Performance Curves)
Majax-2 (10 Pole - 580 r/min Performance Curves) TYPICAL ELECTRICAL CONNECTIONS SINGLE PHASE S 3 PHASE S - STAR WIRED L N E E W1 L N V1 W2 U1 U2 V2 380-415V 3 Ph 50Hz 3 PHASE S - DELTA WIRED UP TO 7.5kW 3 PHASE S - DELTA WIRED 11kW & ABOVE E E U1 V1 W1 W1 U2 U1 V1 W1 V2 U1 V1 W2 U2 W2 V2 U2 W2 V2 380-415V 3 Ph 50Hz Factory Fitted Link Wires 380-415V 3 Ph 50Hz Factory Fitted Link Wires