6
Start-up
Prior to seasonal start-up, lubricate the motor
base adjusting screw (see
Figure 2
) and the
fan shaft bearings. At initial
start-up, no bearing lubrication is
required since the bearings are factory
lubricated prior to shipment.
• Apply RUST VETO
®
to steel shafts.
• Fill the cold water basin with fresh water
to the overflow level via the make-up
valve.
• Set the make-up valve float so the water shuts off at the operating level see
Table 1
on
).
• Execute one of the following biocide treatment programs while operating the
circulating pump and prior to operating the unit fan(s):
–
Resume treatment with the biocide that was used prior to shutdown. Operate the
pump only while maintaining the maximum recommended biocide residual for a
sufficient duration (residual and time will vary with the biocide) as recommended
by the water treatment supplier. Start the fan only after this treatment period is
completed.
–
Check the pH of the circulating water and, if necessary, adjust it to 7.0 - 7.6 pH.
Then, running the pump only, treat the system with sodium hypochlorite to maintain
a level of 4 to 5 mg/l (ppm) free chlorine (as Cl
2
) over a six hour period. Test kits for
measuring the free residual of chlorine are commercially available. Start the fan only
after this treatment period is completed.
• Start the unit pump and check for the proper rotation indicated by the arrow on the
pump cover.
• On installations where the unit pump was not furnished by BAC, a globe valve should
be installed in the pump discharge line and the pump flow rate adjusted to the correct
water flow and pressure (2 psig at spray header connection).
• 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.
• Inspect the nozzles and heat transfer section as described in “Water Distribution
System” on
.
• Verify proper fan tip clearance. Refer to Fan “Inspection & Maintenance” on
Page 11
.
• Open the valve in the unit bleed line, and adjust the bleed by closing or opening the
valve until desired bleed rate is reached.
• For initial start-up, bump fan motor(s) and note the direction of rotation. Start the
fan motor(s) and check for proper fan rotation. The fan 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 the BALTIGUARD™ Fan System, BALTIGUARD PLUS™ Fan System or two speed
motors: check that the starter incorporates a 15 second time delay when switching
from high to low speed.
• Check the operation of the vibration cutout switch (
see Page 40
).
• Once the unit is operating, check the current and voltage of all three phases (legs)
of the fan motor with a heat load on the unit under warm ambient conditions. The
current must not exceed the nameplate ratings.
• For units with VFDs, see
.
• For units with the optional Electric Water Level Control, see
.
Figure 2.
Adjustable Motor Base on Dual Air Intake FXV3/CXVT
NOTICE:
Spray pressure greater
than 10.0 psig may cause damage
to the distribution system.
NOTICE:
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.
After 24 hours of operation
under thermal load, perform the
following services:
9
Check the unit for any unusual
noises or vibrations.
9
Check the operating water
level in the cold water basins.
9
Adjust the make-up valve if
necessary.
9
Check the belt tension and
readjust if necessary.
9
Inspect the spray nozzles and
heat transfer section.
