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11
CAUTION:
Openings and/or
submerged obstructions may exist
in the bottom of the cold water
basin. Use caution when walking
inside this equipment.
• Quarterly, or more often if necessary, drain, clean, and flush the entire cold water basin
with fresh water. This will remove the sediment, which can collect in the basin during
operation. If not removed, sediment can become corrosive and cause deterioration of
the protective finish of metallic basins.
–
When flushing the basin, leave the strainer in place to prevent the sediment from re-
entering the spray pump.
–
Remove the strainer after the basin has been flushed.
–
Clean and replace the strainer before refilling the basin with fresh water.
• Adjust the float to maintain the design operating level. See
Table 1
.
• Verify combined inlet shield retainers are compressed to engage the combined inlet
shields (CIS). This will prevent the CIS from separating from the unit during high winds.
Fan
The PT2 Cooling Tower uses axial fan(s). Thoroughly inspect the fan(s) for damaged or
deteriorated fan blades and replace the fan(s) as required.
Inspection & Maintenance
• If the unit is already in operation, while the fan is running, check for any unusual noises
or vibrations from a safe distance.
• 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).
–
Check the fan blades for looseness, first by twisting the blade by hand, and then by
moving the blade tip up and down. There should be no play or slippage.
–
Inspect each blade for excessive scale build-up that could cause vibration.
–
Check each blade for any cracks. If cracks are found, the fan motor should be locked
out until the fan is replaced. Contact your local BAC Representative for assistance.
•
Tip Clearance:
Check the clearance between the tip of the blade and the fan cowl. The
clearance should be between 1/8” and 1/2”.
•
Drain Holes
: On hollow blades, the drain hole in the blade tip should be unobstructed.
Tip: Use a piece of wire to probe the hole.
•
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.
•
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.
•
Direction of Rotation:
On initial start-up, or if the fan motor has been rewired, briefly
energize the fan motor and note the direction of rotation. It should rotate in the
direction indicated by the arrow on the fan cowl. On units with independent fan motors,
check the rotation of each fan.
•
Operation:
On initial start-up, run the fan in the manual mode for several minutes, and
check for any unusual noises or vibrations from a safe distance.
Detailed Component
Maintenance
Procedures
Cold Water Basin
Water Levels
Inspection & Maintenance
Fan
Inspection & Maintenance
DANGER:
Rotating equipment
will cause severe personal injury
or death to persons who come in
contact. Do not perform any service,
maintenance or inspection on or
near the fans, motors, and drives,
or inside the unit without first
ensuring that the fan and pump
motors are disconnected, locked
out, and tagged out.
NOTICE:
Ensure the controls for
the fan motor are set to allow a
maximum of six on-off cycles per
hour to prevent motor overload.
