• Fin Fan Maintenance

. Service Manual Installation and Maintenance E-series Axial Flow Cooling Fans Warning Failure to comply with these instructions could cause serious bodily harm or property damage and will void the warranty.

Howden 24-07.030r04E 1/25. Retaining plate.15 Balancing.16 IV. Commissioning.16 V. Preventive Maintenance.18 VI. Contact Howden. Trouble Shooting.20 VIII.

Overview Tightening Torques.23 IX. Hardware Overview.24 X. Guideline for acceptable vibration levels of cooling fans in application category BV-3 (according ISO 14694). (As well depends on duty point) Howden E-series fans are most widely used ft/min and are available in three different blade pro- 13780 files, ENF, ELF & ELFA. Whether you are 11811 looking for a highly efficient impeller and/or a ELFA 9055. FAN 30ENF6 EP Leading edge protection for wet cooling tower applications Number of blades: 3,4,5,6,7,8,9 Impeller type: ENF, ELF, ELFA Fan diameter: metric or imperial (100 = mm, 4455 mm / 14 feet the derneath the hub-plate we recommend in- blade sets can be installed on any position of Howden 24-07.030r04 12/25 E-series Axial Flow Cooling Fans.

(at least as long as the profile width) on top of the blade (discharge side) at about 50 mm (2 inches) from the blade profile end. Place an inclinometer on top of the straight edge (figure 15). Figure 15 Howden 24-07.030r04 13/25 E-series Axial Flow Cooling Fans. Figure 17 When the blade angle has changed, the U- Howden recommends a tip clearance of 0.5% of bolts need to be tightened again to full the impeller diameter. Fan selections using torque and also re-tightened after 120-150 Howden CF-P20 software use this default stan- hours.

(see table 4 for the number of recom- Important mended measuring points). Slowly rotate Howden strongly recommends the the impeller by hand to the different meas- installation of a retaining plate for all uring points.

If the impeller is installed in a different hub- plate configuration than it was balanced, e.g. Configuration B for an installation with the clamping pieces at flow inlet side, you run the risk of an unquiet operation. Howden 24-07.030r04 16/25 E-series Axial Flow Cooling Fans. Immediately after first start up check for 19, in case the fan is mounted directly on smooth operation of the fan assembly. The gearbox shaft.

Check for irregular noise / vibrations. Howden adopts the guideline given in standard ISO-14694 describing acceptable vibration levels. The “in situ”.

Fin Fan Maintenance

Directive material (PU filler, e.g. Sikaflex 252) to 94/9/EC (ATEX 100): prevent moisture penetration affecting the blades.

Howden Cooling Fans can Electrically earthed metal bearing provide you a repair kit complete with in- support to avoid sparkling by electrical structions. Howden shall be glad to ad- vise you the best maintenance solution for your application.

Replace corroded bolts and nuts. Service Manual VII.

TROUBLE SHOOTING In case of any failure, please contact Howden stating the impeller order number as mentioned on the nameplate located at the hub of the impeller. Problem Possible cause Possible solution Air volume low.

Fouling of system. Blade is not flush against Release U-bolts, pull the lower clamping piece. Blade outwards and re- tighten the U-bolts to the correct torque.

Blade angle(s) not within Re-set the blade angles. ±0.5° tolerance.

Howden 24-07.030r04 21/25 E-series Axial Flow Cooling Fans. We advise to fill these ages.

Cracks with a touch-up material e.g. Sikaflex 252 to prevent moisture pene- tration affecting the blades (Contact Howden for a re- pair kit). Hairline cracks on blade Could appear in resin rich Hairline cracks are harm- surface. Torque values for retaining plate bolt Class 8.8 / A4 Retaining plate Thread mm / inch Size 79 mm / 3.11“ 189 mm / 7.44” 240 mm / 9.45” 360 mm / 14.17” M30 Table 7 Howden 24-07.030r04 23/25 E-series Axial Flow Cooling Fans.

3048 3120 3353 3515 3658 3962 4267 4455 4877 4950 5486 5545 6096 6240 6702 7030 7315 7920 7925 8535 8910 9145 9754 9900 0 0 0 Table 8 Howden 24-07.030r04 24/25 E-series Axial Flow Cooling Fans. Fit information added at installation instructions of parallel bore coupling flanges Adjustment of blade assembly procedure regarding re- tightening after blade angle adjustment Adjustment of instructions coupling flange with tapered bushing Replacement of the word cap screws into bolts Howden 24-07.030r04 25/25 E-series Axial Flow Cooling Fans. Maximum Vibration Levels For Balance Vibration category BV-3 (ISO 14694) & added Table 9 Changed material codes: AISI 304 AISI 316 Inserted „‟Blades Installation‟‟ „‟Procedure b‟‟, p13 Inserted „‟ IV Commisioning‟‟ „‟Section G‟‟ p17 Howden 24-07.030r04 26/25 E-series Axial Flow Cooling Fans.

Hubplate installation important block E-series Blades installation part1 E-series Blades installation part2 E,SX-series Blades installation part3 r2 Blades installation warning block r1 Minimum tip clearance Minimum tip clearance table E,SX-series Impeller diameter reduction Howden 24-07.030r04 27/25 E-series Axial Flow Cooling Fans. Commissioning table D,SX,E-series r1 Commissioning important block Commissioning warning block2 Preventive maintenance Preventive maintenance important block Contact Howden Trouble shooting r1 Trouble shooting table1 r2 Overview tightening torques table1 E-series r1 Overview tightening torques table2 E-series r1 Hardware overview E-series.