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installation <br /> BLOWER ADJUSTMENTS 6. Retighten motor sheave set screw, replace belt and <br /> Following electrical connections, check blower rotation to retighten motor base.Adjust belt tension adjusting screw <br /> assure blow-through heating. If necessary, interchange wir- such that there is 3/4"belt deflection when pressed with <br /> ing to reverse blower rotation.Start blower motor and check 5 pounds of force midway between the blower and motor <br /> blower sheave RPM with a hand-held or strobe-type tach- sheaves (see Figure 6a). Since the belt tension will <br /> ometer. RPM should check out with the speeds listed in decrease dramatically after an initial run-In period, it <br /> Performance Data shown on pages 18 and 19 according to is necessary to periodically re-check the tension to assure <br /> the job specifications.A single-speed motor with an adjusta- continual proper belt adjustment. <br /> ble motor sheave is supplied with these units. if blower fan 7. Check to make certain motor pulley and blower sheave <br /> speed changes are required,adjust motor sheave as follows: are aligned. Re-align if necessary. <br /> 1. Shut-off power before making blower speed adjust- 8. Re-check blower RPM after adjustment. <br /> ments.Refer to Determining Blower Speed on page 7 and <br /> to Blower Drive Selection on pages 18 and 19 to deter- NOTE: Do not fire unit until blower adjustment has been <br /> mine proper blower RPM. made or unit may cycle on limit(overheat) control. <br /> 2. Loosen motor base and take belt off of motor sheave. 9. Check motor amps. Do not exceed amps'shown on <br /> 3. Loosen set screw on outer side of adjustable motor motor nameplate.Slow blower if necessary. <br /> sheave (see Figure 6). 10. Check air temperature rise across unit.Check tempera- <br /> ture rise against values shown in Performance Tables on <br /> 4. To reduce the speed of the blower, turn outer side of pages 18 and 19 to assure actual desired air flow is being <br /> motor sheave counterclockwise. achieved. <br /> 5. To increase the speed of the blower,turn outer side of 11. If adjustments are required, recheck motor amps after <br /> motor sheave clockwise. final blower speed adjustment. <br /> TOWARD MOTOR SET SCREWS <br /> i <br /> O <br /> k <br /> i <br /> DEFLECTION <br /> 16 WITH 5#FORCE <br /> ADJUSTABLE HALF O <br /> OF SHEAVE <br /> Figure 6 Figure 6a <br /> Motor Sheave Adjustment Belt Tension Adjustment <br /> Page 8 <br />