20
Bond the torn section back together. Avoid getting the silicone on the outer or wearing portion of the
seal. This can cause excess drag. Plan to replace the damaged seal as soon as possible.
5.6 INSPECTING THE FANS
1. Turn off the unit before you check the fans. After you turn the unit off, wait three minutes to allow the
fans to stop spinning.
Keep your hands away from the fans while the unit is turned on.
Turn off the power, using the disconnect or circuit breaker,
before you inspect the fans. Follow standard lockout tag-out
procedures.
2. Supply fan. If the supply fan is still spinning even slowly, DO NOT TOUCH IT UNTIL IT HAS
COMPLETELY STOPPED. The fan wheel is heavy and has a lot of inertia. The fan should spin
easily. The bearings should not make noise and the inlet cone should not contact the fan blade.
There should be no free play when you try to move the motor shaft side-to-side. A motor with stiff or
gritty bearings must be replaced. The motor should be greased every other year using a lithium-
based grease such as Shell Alvania R3 or equivalent as follows. With the unit shut off, wipe off the
grease fitting and apply a small amount of grease. Close the door and run the unit for a few minutes.
Shut the unit off again and allow the fan to stop. Apply a small additional amount of grease. Applying
all of the grease at once can result in grease getting inside the motor housing through the inner seal
and causing premature motor failure. Applying too much grease can result in the bearing overheating
and premature motor failure.
3. Reactivation fan. This fan should also spin easily. The bearings should not make noise. There should
be no free play when you try to move the motor shaft side-to-side. A motor with stiff or gritty bearings
must be replaced. The motor should be greased every other year using a lithium-based grease such
as Shell Alvania R3 or equivalent as follows. With the unit shut off, wipe off the grease fitting and
apply a small amount of grease. Close the door and run the unit for a few minutes. Shut the unit off
again and allow the fan to stop. Apply a small additional amount of grease. Applying all of the grease
at once can result in grease getting inside the motor housing through the inner seal and causing
premature motor failure. Applying too much grease can result in the bearing overheating and
premature motor failure. The fan bearings should be greased every other year in a manner the same
as the motor. The belts should be free of visible signs of wear or cracking. The belt tension should
allow 1/2” of play with a force exerted with one finger half way between the pulleys.
4. Condenser fan(s). The condenser fans are propeller-type and are located on the end of the unit. The
condenser fan should spin easily. The condenser fan is permanently lubricated.
5.7 INSPECTING THE WHEEL DRIVE MOTOR AND BELT
1. The drive motor is located inside the cassette.
2. Check the belt for signs of stiffness or cracking. Replace it if necessary (see 5.11).
5.8 INSPECTING THE ROLLER WHEELS
1. The HoneyCombe
®
wheel is supported on four rollers.
2. Each pair of rollers is supported by a shaft that sits in a support bracket. Each roller should have a
small side-to-side play on the shaft.
3. If the rollers become worn, excessive play may develop. This can cause uneven support of the
HoneyCombe
®
wheel. Inspect the rollers and check for signs of wear. Only the front rollers can be
seen without removal of the wheel. Normally, if the front rollers are in good condition, the back rollers
will be the same and it is not necessary to remove the wheel to inspect them. Replace all rollers if
To Next Page
Loading...
