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2 *Preferred inhibitors. lubricant because it contains rust and oxidation Fig. 17 — Fan Shaft, Bearings, and Fan Wheel (Typical) 23 Centering Fan Wheel — If fan and fan shaft assembly are not properly centered, blades may scrape against scroll or may create an objectionable whistling noise. It may be necessary to adjust individual fan wheels or move entire fan shaft. See the following two sections. Fan Shaft Position Adjustment — Loosen setscrew or locking collar of each fan shaft bearing. Slide shaft into correct position and replace locking collar (Fig. 18). To replace locking collar, push collar up against inner face of bearing. Turn collar in direction of fan rotation until tight, and tighten setscrew. Tightening locking collar in direction of fan rotation results in further tightening of collar should setscrew work itself loose. Fig.18—FanShaftBearing Individual Fan Wheel Adjustment — Loosen the 2 locking bolts holding fan wheel hub to shaft. See Fig. 17. Position fan wheel in center of the fan housing and tighten locking bolts. Clearance between wheel and housing should be the same on both sides. Fan Belts — Motor mounting plate and motor support angles are slotted to permit both vertical and horizontal adjustment. Adjust belt(s) for correct deflection by loosening motor plate mounting bolts, moving motor/plate assembly forward or back, and retightening bolts. Press down on belt with one finger midway between fan and motor pulleys to check deflection. For units with motor sizes up to and including 3.7 Hp (2.76 kW), correct deflection is 3.16-in. (4.8 mm) For larger motor sizes, correct deflection is 1.8-in. (3.2 mm). See Fig. 19. NOTE: The 028 and 034 size units with 60 Hz motors are shipped with an extra set of matching belts. Use the pre- installed belts or extra belts depending on the adjustable pulley setting. If complete belt replacement is required during servicing, loosen the motor plate mounting bolts (Fig. 19), move motor/plate assembly towards fan pulley, and pull belt(s) off pulleys. Reverse the procedure with new bolts and readjust deflection. Fan Rotation — Correct fan rotation with respect to fan outlet is shown in Fig. 20. To reverse the direction of rotation of a 3-phase fan motor, reverse any 2 of the power leads. Refer to the connection diagram on the inside of motor terminal box cover for proper reversing procedure of single-phase motor. Fig.19—FanMotorMounting 24 Fig.21—FanPulleyAdjustments Fig. 20 — Fan Rotation Fan Pulley Alignment — Align as follows: 1. Loosen setscrews on pulleys. 2. Align pulleys visually and tighten setscrews on fan pulley to lock it in place. 3. Use the methods shown in Fig. 21 to check proper pulley alignment. 4. If pulleys are not in correct alignment, loosen the motor holddown bolts and slide the motor axially until the pulleys are aligned. 5. Tighten motor holddown bolts. Pulley and Drive Adjustment — To obtain desired fan speed, refer to the fan motor and drive data in Tables 8A-10D and adjust fan motor pulley as follows: 1. Remove belt from fan motor pulley after loosening motor from motor base. 2. Loosen setscrew in moveable flange of pulley. Screw moveable flange toward fixed flange to increase the fan speed and away from fixed flange to reduce speed. Before tightening setscrew, make certain that setscrew is over nearest flat surface of pulley hub (Fig. 21). Increasing fan speed produces a greater load on motor. Do not exceed rated capacity of motor. Condensate Drains — Keep condensate drains free of dirt and foreign matter. Return-Air Filters — Refer to Replacing Filters section, page 39, for filter accessibility and removal. Replace with clean filters of the sizes listed in Tables 1A-1F. Chilled Water Coil Freeze Protection — Shut off water supply to unit. Remove side panel of unit and remove vent and drain plugs in top and bottom of coil header. Drain coil and blow out remaining water. Reinstall plugs and side panel. Alternative freeze protection methods follow: • Circulate hot water within the water coil’s supply main or supplementary space heating. • Close off supply lines to unit and open a union or field- supplied drain valve in the return line. IMPORTANT: Draining from return line will not completely drain water from coils. After draining as much water as possible from coils, add sufficient antifreeze to prevent residual water in the coil from freezing. • Add a sufficient quantity of non-corrosive antifreeze to the entire system to prevent all water within the system from freezing. Coil Removal — Remove unit panels and corner posts as required. Disconnect coil connections and remove fastening screws. Remove coil through end or side sections of unit. Cleaning Cooling Coil — Remove return-air filters. Remove any heavy dirt that may have accumulated on underside of coil. Coil can be cleaned more easily with a stiff brush, vacuum cleaner, or compressed air when coil is dry. If coil is wet or if water is to be used for cleaning, guard against spla...

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