BAC PCT Series Operation & Maintenance Manual page 10

WARNING: Check to ensure the
controls for the fan motor are set
to allow a maximum of six on-off
cycles per hour to prevent
motor overload.
CAUTION: Pressure greater than
69 kPa may cause damage to
the distribution system.
After 24 hours of operation
under thermal load, perform the
following services:
9
Check the unit for any
unusual noise or vibrations.
9
Check the operating water
level in the cold water basin.
9
Adjust make-up valve if
necessary.
9
Check the belt tension and
readjust if necessary.
9
Inspect the spray nozzles
and heat transfer section.
M A R 1 0 8 - 2
4
W W W . B A L T I M O R E A I R C O I L . C O M . A U
Start-up
• Prior to seasonal start-up, lubricate the motor base adjusting
screw(s) and fan shaft bearings. At initial start-up, no bearing
lubrication is required since the bearings are factory lubricated prior
to the shipment.
• Apply RUST VETO to steel shafts.
®
• Fill the cold water basin with fresh water up to the overflow level via
the make-up valve.
– Water Treatment for New Installations: Initiate the biocide water
treatment program at this time.
– Water Treatment for Seasonal Start-up or after a Shutdown
period in excess of three days: Resume the biocide treatment
program or administer a shock treatment of appropriate biocides
prior to operating the cooling tower fans. This will eliminate
accumulated biological contaminants.
• Set the make-up valve float so the water shuts off at the overflow level.
• Start the system pump.
• Adjust the system flow rate to the design rate. Open the supply
valve slowly until the design flow is reached, based on the pressure
in the distribution system.
• Check that the float operated make-up valve is operating freely.
Closely monitor water level and adjust as necessary during the first
24 hours of operation.
• For multicell arrangements, balance flow between the cells to obtain
even water distribution.
• Check the nozzle spray pattern as described in "Water Distribution
System and Heat Transfer System" on Page 18.
• Open the valve in the tower bleed line, and adjust the bleed by
closing or opening the valve.
• Verify fan tip clearance is between 3mm and 13mm.
• For initial start-up, bump the fan motor and note the direction of
rotation. Start the fan motor(s) and verify proper fan rotation without
obstruction. The fan(s) should rotate in the direction indicated by
the arrow on the fan cowl.
• Run the fan in manual mode for several minutes to check for any
unusual noise or vibrations.
• For a 2-speed motor, check to ensure the starter includes 15 second
time delay when switching from high speed to low speed.
• Check the operation of the optional vibration cutout switch.
• Once the cooling tower is operating, check the current and the
voltage of all three phases (legs) of the fan motor with a heat load
on the tower under warm ambient conditions. The current must not
exceed the nameplate ratings.