Wolf AHU TE - Maintenance - Fan and Drive Belts; Fan Bearing Lubrication and Belt Tension

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3064058_201610
AHU TE
AHUW TE
Maintenance
Before undertaking maintenance work, always ensure that the system main isolator and
the repair switch(es) are OFF and locked to prevent unintentional reactivation. Activation
without the knowledge and consent of everyone working on or near the machine could
expose them to risks due to rotating and moving parts.
Always wait for the fan to run down to a complete standstill before opening inspection
doors (waiting time at least 2 minutes). The partial vacuum inside the unit could draw
in loose or slack parts when the door is opened, which could cause severe damage to
the fan. Severe or fatal injury could result if the vacuum sucks items of clothing (such
as a necktie) inside. The airstream of the fan could slam an inspection door open and
cause injury if the fan is installed on the pressure side.
Retensionthevee-beltsforthersttimeafterapproximatelyonehourinuse.Subsequently
check the belts regularly: The interval between checks depends on operating conditions,
but should not exceed 4 months.
Always replace the belts of multi-groove drives as a complete set.
Large drive motors are mounted on adjustable square sections or a motor carrier.
Totensionthevee-belt,undothexingscrewsofthesquaresectionsandundothe
locknuts on the tensioning screw. Tighten the tensioning screw until the belt is correctly
tensioned, ensuring that the vee-belt pulleys remain in perfect alignment. Tighten the
locknutsandthexingscrews.
Check that the vee-belt pulleys are in perfect alignment.
Note
Vee-belt
tensioning screw
(appliance with motor carrier)
Fansection
Fan bearings which can be lubricated must be lubricated with lithium based grease for
thersttimeafterapprox.50hoursrunandthereafterevery2500hoursrun.
Maintenance-free bearings have lifelong lubrication and bear labels to that effect.
Standard three-phase motors are maintenance-free.
In the case of special motors, always comply with the maintenance instructions issued by
the motor manufacturer.
Vee-beltdrive
Always replace the complete set of vee-belts if one or several vee-belts require
replacement on a multi-groove drive.
Never use vee-belts from different manufacturers
In a single set of vee-belts.
Check the security of the vee-belt pulleys and the clamping screws of the clamping
bushes.
Check that the vee-belts are correctly tensioned.
Vee-belts tensioned too tightly or too slack can result in fan or motor bearing
damage.
Ensure the vee-belt pulleys are correctly aligned to prevent unnecessary vee-belt wear
and unnecessary bearing loads.
Regularly check the vee-belt tension.
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