Baltimore Aircoil Company 1500 Series Manual de Instruções de Operação e Manutenção - Página 4
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Operation and
Maintenance
INITIAL AND SEASONAL START-UP:
Prior to initial start-up or after a shut down period, the
cooling tower must be thoroughly inspected and cleaned:
1. Clean all debris, such as leaves and dirt, from inside the
tower, and the air inlet louvers.
2. Cooling Towers equipped with the optional BALANCE-
CLEAN
®
or EASY CLEAN™ Chambers should remove the
inlet strainer, clean and reinstall.
3. Drain the cold water basin (with basin strainers in place)
and flush to remove accumulated dirt.
4. Remove the suction strainer, clean and reinstall.
5. Turn the fan(s) by hand to insure rotation without
obstruction.
6. Start the fan motor(s) and check for proper fan rotation.
7. At seasonal start-up, adjust the belt tension on the
BALTIDRIVE
®
PowerTrain fan drive system. Note that at
initial start-up the tension need not be adjusted since the
drive has been properly tensioned at the factory prior to
shipment.
8. Check float operated make-up valve to be sure it is
operating freely.
9. Prior to seasonal start-up, lubricate the fan shaft
bearings. Note this is not required at initial start-up since
the fan bearings have been lubricated at the factory prior
to shipment.
10. At initial start-up or before start-up when the cold-
water sump is completely drained, fill the cold-water sump
with fresh water to the overflow level. For new installations,
initiate the biocide water treatment program at this time
(see Water Treatment Section). At seasonal start-up, and
following a shutdown period of more than 3 days, resume
the biocide treatment program or administer a shock treat-
ment of appropriate biocides prior to operating the cooling
tower fans to eliminate accumulated biological contami-
nants (see Biological Control Section).
11. Set the float on the make-up valve to shut off the valve
when the float is approximately 1/2" below the overflow
level.
12. For Series 3000 Cooling Towers, balance flow to the
CONDUIT™ Distribution System by adjusting the flow
balancing valves (by others or optionally supplied by
B.A.C.). Adjustment to the balancing valves is not required
if the unit is equipped with the optional BALANCE-CLEAN
Chamber and EASY CONNECT
Multi-cell arrangements will require flow balancing
between cells to obtain even water distribution.
13. Open the valve in the tower bleed line (by others) and
adjust bleed to the recommended rate. (See "Water
4
Treatment"– page 10.)
(continued)
®
Piping Arrangement.
14. Check the voltage and current of all three legs of the
fan motor. The current should not exceed the nameplate
rating. Note: Current should be measured during warm
ambient conditions and with a heat load on the tower. After
prolonged shutdowns, the motor insulation should
be checked with a "megger" insulation tester prior to
restarting the motor.
CAUTION: Rapid on-off cycling can cause the fan motor
to overheat. It is recommended that the controls be set to
allow a maximum of 6 on-off cycles per hour.
When using a 2-speed motor, the starter should include a
15-second time delay when switching from high speed to
low speed.
Inverter Duty Fan Motors, furnished in accordance with
NEMA Standard MG.1 Part 31 are recommended for
applications using Variable Frequency Drives for fan
motor control.
AFTER 24 HOURS:
After 24 hours of operating under load, the following
services should be performed:
1. Check the tower for any unusual noise or vibration.
2. Check the operating water level in the cold water basin.
Adjust make-up float valve if necessary.
3. Readjust the belt tension.
OPERATION:
During operation, the tower should be inspected, cleaned,
and lubricated on a regular basis. The required services
and recommended frequency for each are summarized in
Table 1 on page 3 of this bulletin.
SEASONAL SHUTDOWN:
The following services should be performed whenever the
cooling tower is to be shutdown for more than 3 days:
1. Drain the cold water basin and all piping that will be
exposed to freezing temperatures.
2. Clean and flush the CONDUIT™ Distribution System
and cold water basin with the basin strainers in place.
Leave the cold water basin drain open so rain and melting
snow will drain from the tower (for Series 3000 units with
the optional BALANCE-CLEAN
units with the optional EASY-CLEAN™ Chamber, clean and
flush the inlet strainer).
3. Clean the basin strainers and reinstall.
4. Cover the fan discharge opening to keep out dirt
and debris.
5. Lubricate the fan shaft bearings and motor base
adjusting screw.
6. Close the shutoff valve in the make-up water line (by
®
others) and drain all exposed make-up water piping.
7. Inspect the integrity of the corrosion protection system
on the steel portion of the tower. (See Corrosion
Protection, page 8.)
®
Chamber and Series 1500