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Increase Quality Through Interaction with the Field
1. Check Housing Aesthetics and Structural Integrity
a. If you cannot see the blemish at arms length then it probably doesn't matter
otherwise apply the following.
b. Hairline scratches:
i. Top & Sides-no more than 2, at ≤ ½", on each surface.
ii. Rear & Bottom-no more than 3, at ≤ 1", on each surface.
c. Gouges:
i. Top & Sides-none
ii. Rear & Bottom-no more than 2, at ≤ ¼", on each surface.
d. Cracks:
i. No more than 2 total, at ≤ ¼", per unit.
2. If Equipped: Check that the Louver Functions Smoothly
a. Operate the actuator back and forth.
b. Assure the louvers all move together at the same time.
3. Check the Fan Speed Switch and Motor Functions
a. Must function in all three positions.
b. Test whether the fan will bind in Silent. Unplug the unit and set the switch to silent.
Plug in the unit-the fan should start up.
c. If it doesn't, first check for proper fan installation:
The fan grommet on the left is solid, has four
holding tabs, butts against the motor shaft's
brass ring and must hold in this position to
provide clearance between the fan and fan
bushing grommet. This fan grommet must be
a tight fit to the motor shaft and free of
lubricants.
The grommet on the right is tiered, has four
holding tabs and envelops and holds onto the
motor shaft's brass ring. As you can see if
this grommet is only butted against the brass
ring then the normal clearance between the
fan and fan bushing grommet shown in the
picture would be nonexistent. The reduced
clearance could cause screeching as the
grommet and fan touch.
d. Then check to see if the fan shaft and bearing are gummed up or worn:
Clean fan shaft and bearing. Apply oil to bearing assembly.
Increase Quality Through Interaction with the Field
Tune-Up
3
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