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8
• The storage area should be free from ambient vibration. Excessive vibration can cause
bearing damage.
• Precautions should be taken to prevent rodents, snakes, birds, or other small animals
from nesting inside the motors. In areas where they are prevalent, precautions must
also be taken to prevent insects from gaining access to the interior of the motor.
• If not stored indoors in a controlled environment, some form of heating must be
utilized to prevent condensation from accumulating in the motor. This heating should
maintain the winding temperature at a minimum of 9ºF (-12.8ºC) above the ambient
temperature of the surrounding environment, keeping it from dropping below the dew
point where condensation could form inside the motor. If space heaters are supplied,
they should be energized. Request the required voltage and transformer capacity from
your local BAC Representative. A third option is to use an auxiliary heat source and
keep the winding warm by either convection or blowing warm air into the motor.
• Rotate the motor shaft monthly to redistribute bearing grease.
Maintenance Requirements
• Rotate all fans and motor shafts monthly by hand. Hand-turning will ensure that the
shafts and bearings are free and will redistribute grease within the bearings. Keep
hands away from pinch points such as bolts and sheaves.
• Inspect the cold water basin monthly to ensure that the drain is open and remove any
leaves or debris that may have accumulated in the cold water basin.
• Inspect axial fans prior to start-up and at least once annually to ensure that the blades
are tight and that there is no obvious corrosion between the hub and the fan blade.
• Inspect the rust preventative coating on all motor external machined surfaces
including shaft extensions monthly. If necessary, re-coat the surfaces with RUST
VETO
®
.
Start-Up Preparation After Prolonged Storage
Keep in mind that start-up procedures after long periods of storage are just as important as
pre-shutdown procedures.
• Motors should be thoroughly inspected and cleaned and restored to pre-storage
condition.
• Inspect the axial fan prior to start-up to ensure that the blades are tight and that there
is no obvious corrosion between the hub and the fan blades. Do not energize the fan
if there is obvious corrosion of fan components. Loose fan blades could result in fan
failure and possible injury or damage.
• Reinstall all fan belts, motors, door gaskets, and drain plugs (as applicable), and
remove all protective coverings.
• For units stored prior to installation, conduct rigging procedures as directed in the
unit’s
Rigging and Assembly Instructions
, available on www.BaltimoreAircoil.com or by
contacting your local BAC Representative.
• Perform an insulation test of motor windings to ensure satisfactory insulation
resistance.
• Conduct full start-up procedure as stated in the “Start-Up Procedure” on
page 4
. Be
especially thorough for cleaning and inspection prior to start-up.
• For units with the optional gear drive system, the gear box must be fully drained,
then refilled with new oil at or near the middle of the oil level sight gauge to prevent
damage. Then, follow the steps in “Initial Start-up” on
page 13
.
DANGER:
Do not perform any
service on or near the fans, motors
and drives, or inside the unit
without first ensuring that the
fans and pumps are disconnected,
locked out and tagged out.