___________________________________________________Chapter 6 – Exhaust Fan Section, Page 6-3
Exhaust Fan – Initial Set-Up (Cont.)
Idle Fan Requirements
1.
If the fan is going to sit idle for any length of time, rotate the wheel several revolutions every three
to five days to keep a coating of grease on all internal bearing parts. Turn the wheel by hand while
greasing bearings. A clean 1/16" bead of grease must appear on each side of each bearing.
Refer to specific bearing lubricating instructions on the fan housing.
Initial Operation
After pre-operational checks, unit is ready for operation. Start the exhaust fan and check the following:
1.
There is a rotation arrow on the fan housing. Check for proper rotation.
2.
Excessive vibration.
3.
Unusual noise.
4.
Bearing noise.
5.
Improper belt alignment or tension (listen for squealing).
If a problem is discovered, immediately shut the fan off. Lock out all electrical power and check
for the cause of the problem and repair.
Exhaust Fan - Preventive Maintenance
Every six months conduct the following maintenance:
Extreme Caution: Before performing any maintenance on the exhaust fan always shut off the electrical
power to the fan by disconnect switch located on the ClearAir unit Main Electrical Panel (Refer to Figure
4-23-1). Place a sign on the Command Center or any other control that starts the exhaust fan stating
“Do Not Start Fan. Fan Maintenance In Process”.
1.
Inspect bolts and setscrews for tightness. Tighten as necessary. Worn setscrews should be
replaced immediately.
2.
Inspect belt wear and alignment. Replace worn belts with new belts and adjust alignment as
needed.
3.
Check for condition of the belts. Replace cracked, glazed or frayed belts.
4.
Check for proper deflection of the belt. The deflection of the belt is approximately 1/4 inch per
foot of center distance when firmly pressing the belt in the center. If the belt does not have the
proper deflection, adjustment is accomplished by use of adjustable motor base.
5.
Lubricate the bearings. Before lubrication, the grease nipple and immediate vicinity should be
thoroughly cleaned without the use of high pressure equipment. Completely fill the bearings with
grease or moisture-inhibiting oil. Loren Cook Company uses petroleum lubricant in a lithium base.
For best results, lubricate the bearings while turning the fan wheel. Pump grease in slowly until a
slight bead forms around the bearing seals. Excessive grease can burst seals thus reducing bearing
life. In the event the bearings cannot be seen, use no more than three injections with a hand
operated grease gun.
