STEP-BY-STEP INSTRUCTIONS FOR FAN ASSEMBLY

1. INSTALLING THE HUB. The hub element is shipped with the bushing (item HORIZONTAL FANS: On horizontal mounted fans, select an accessible work #3) in place. Remove bushing (using extraction bolts if necessary) from hub location at any point of the fan ring.This will become your"starting point". Rotate to proceed with installation. the fan hub as required to ensure that all blades are installed at what was previously established as the "starting point". Measure blade angle at the same 2. Place hub (item #2) on shaft. Blade clamps (item #4) normally face the dislocation on all blades and always confirm the blade being measured is at charge or air flow side of the unit. the "starting point". 3. Position the split-tapered bushing (#3) on the shaft - and inside the hub - with Place the flange normally facing the fan discharge side. Be sure the bushing and key way are aligned. Insert the key into the key way and gently tap the full length into the bushing. Note: if the bushing does not slide easily onto the shaft, it may be slightly spread by tapping a screwdriver into the split. Do not use a chisel. Photo 1 4. Lift or pull the hub (#2) onto the taper of the bushing (#3) making sure the bolt holes in the bushing flange align with the threaded holes in the hub. 5. Insert bolts (item #6) into holes and tighten each to finger tightness only. Using a torque wrench, tighten the bolts in rotation: 318" bolts to 35 ft. lbs. or 1/2" bolts to 45 ft. lbs. Be particularly careful to tighten the bolts in a rotation pattern and in accordance with correct torque wrench use. DO NOT USE ANY FORM OF LUBRICANT OR ANTI SEIZE ON THREADED JOINTS. 6. INSTALLING THE BLADES. Remove clamps (#4) one at a time to install individual blades. See Photo 2. To protect the factory balancing of the hub, clamps should be reinstalled at same location as originally shipped. Blades are marked in pairs and must be installed opposing each other in the fan hub. Note: Two people are required to correctly install fan blades and properly set blade angle. EXCEPTION: Fans built to API Standard are shipped with all blades marked identically. In this case, any blade may be placed at any location on the hub. PLEASE NOTE: On multiple fan orders, it is essential to match blade markings. Do not mix blades with dissimilar markings on the same hub. VERTICAL FANS: On vertical mounted fans, install the first blade at the 3:00 position when facing the fan discharge side. Rotate fan hub to the 3:00 position for installation of all subsequent blades. Measure blade angle at the same location on all blades and always confirm the blade being measured is at the 3:00 position. Photo 2

HORIZONTAL FANS: On horizontal mounted fans, select an accessible work location at any point of the fan ring. This will become your "starting point". Rotate the fan hub as required to ensure that all blades are installed at what was previously established as the "starting point". Measure blade angle at the same location on all blades and always confirm the blade being measured is at the "starting point." Place the blade shanks (item #7) into the hub sockets. If required, use the supplied spacer rings to shorten the effective blade length. NOTE: All fans are designed to utilize 1 SPACER RING PER BLADE to achieve the correct diameter. Increase or decrease the number of spacers only if overall diameter adjustment is needed for proper tip clearance. Clearance between blade tip and fan ring should not exceed 1/2% of the fan diameter or 3/4 inch. Replace the clamps and bolts (item  #5) and tighten nuts to a snug fit only Pull the blade outward (away from the hub and toward the fan ring) in a rocking motion until the blade shank (#7) flange (or spacer ring) is resting firmly against the shoulder of the hub socket. Confirm that fan blade trailing edge (thin side) is higher than the leading edge (thick side). If it is not, make the necessary adjustment by twisting the blade while it is "loose fit" to the hub. Check the direction of rotation and confirm the fan blades are installed correctly After installing all blades, mark the fan ring at the blade leading and trailing edges. Slowly rotate fan to confirm blade "tracking" is within the greater of +/- 1/4" or +/- .25% of fan diameter. If not, loosen the clamp bolts and manually adjust blade(s) until tracking is within prescribed tolerance. 7. SETTING THE BLADE ANGLE. Set the blade angle as marked on the blade. See photo 3. Note: Two people are required to correctly install blades and set angle. a. Pre-set the correct angle on the machinist's protractor. b. Place protractor on position indicated by label on fan blade. c. Observing bubble on protractor, tap the blade shank with a rubber mallet until the bubble centers. d. Using a torque wrench, carefully tighten the nuts (in an alternating pattern) to the following: 1/2" nuts to 45 ft. lbs. 5/8" nuts to 75 ft. lbs. / 3/4" nuts to 90 ft. lbs. e. Re-check the blade angle with machinist's protractor. Photo 3 Follow the above procedure for all blades. Be sure that blades are installed in opposing pairs to ensure perfect balance of the assembled unit. EXCEPTION: Fans built to API 661 Standards are shipped with all blades marked identically. In this case, any blade may be placed at any location on the hub. PLEASE NOTE: On multiple fan orders, it is essential to match blade markings. Don't mix blades with dissimilar markings on same hub. 8. INSTALLATION CHECKS. a. Re-check all bolts and centering of fan in ring. b. Check to confirm the motor, gear and sheave speeds are correct. c. "Bump" the motor to confirm fan is turning in the correct direction. d. Mark the fan ring at the blade leading and trailing edges. Slowly rotate the fan to confirm blade "tracking" is within the greater of +/- 1/4' or +/- .25% of fan diameter. 9. RUN-IN CHECK. EXTREMELY IMPORTANT After one hour run-in, recheck the blade angle with the machinist's protractor and re-torque all blade retention cap bolts to proper torque. Electric Amp draw rate should also be checked at this time.

AMARILLO CHITTOM AIRFLO
728 South Wheeling • Tulsa, OK 74104  USA
Phone: (918) 585-5638 • Fax: (918) 587-3577
E-mail: info@amarillochittom.com