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Override Switch
The override switch bypasses the alarm signal coming from one or more fans and allows the user to regain control of the fans
using the 4-20mA speed signal. This switch should be used when waiting for a fan replacement or if one or more fans are de-
energized for any reason. If the unit must operate at higher speeds than the emergency speed, install the included fan cover
over the inoperable fan to prevent water from leaving the fan housing.
BALTIDRIVE
®
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If the unit is already in operation, while the fan is running, check for any unusual noises or vibrations.
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With the fan off and the fan motor disconnected, locked out, and tagged out, check the general condition of the fan:
Inspect for any loose or missing bolts in the fan shaft bushing, the fan hub, and the fan shaft bearing(s).
o
Check the fan blades for looseness, first by twisting the blade by hand, and then by moving the blade tip
o
forward and back. There should be no play or slippage.
Inspect each blade for excessive scale build-up that could cause vibration.
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Check each blade for any cracks. If cracks are found, the fan motor should be locked out until the fan is
o
replaced. Contact your local BAC Representative for assistance.
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Tip Clearance: Check the clearance between the tip of the blade and the fan cowl. The clearance should be between
3/16" to 1/4".
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Blade Pitch: Check to ensure that the blades are all at the same pitch. If uncertain, measure the pitch with an
inclinometer. All blades should be within 1/2° of each other.
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Rotation: Turn the fan by hand to ensure that it moves freely with no rough spots, binding, or other malfunctions that
could cause vibration or fan motor overload. While rotating the fan, check the blade tracking. All blades should track
within a 1/2" band at any single point around the cowl.
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Direction of Rotation: On initial start-up, or if the fan motor has been rewired, briefly energize the fan motors and note
the direction of rotation. Fans should rotate in the direction indicated by the arrow on the fan cowl.
Vertex™ Evaporative Condenser Operation & Maintenance Manual – Component Maintenance Procedures
Power Train
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