MAINTENANCE PROCEDURES
7
If there is evidence of biofilms the system, including piping should
be drained, flushed and cleaned of slimes and other organic
contamination. Refill system with water and apply biocide shock
treatment. Check pH value and functionality of ongoing biocide
treatment.
HEAT TRANSFER SECTION
The inspection procedure is as follows:
1. Shut off fan(s) and pump(s).
2. Remove the eliminators and access doors.
3. Inspect the coil/wet deck surface for
- obstructions
- damages
- corrosion
- fouling
4. After inspection, install eliminators and access doors and start
pump(s) and fan(s).
Remove any obstructions from heat transfer section(s).
Any damages or corroded areas need to be repaired. Call your local
BAC Balticare representative for assistance.
Minor fouling can usually be removed chemically or by temporary
changes to the water treatment programme. Contact your water
treatment supplier for advice. Major fouling requires cleaning and
flushing according to the CLEANING PROCEDURES (See page 9).
Regular checking of the total aerobic bacteria count (TAB) and
maintaining it within acceptable levels are the key to prevent
fouling.
DRIFT ELIMINATORS
The inspection procedure is as follows :
1. With fan(s) and pump(s) running visually check for areas with
excessive drift loss.
2. Shut off fan(s) and pump(s) and visually check eliminators for
- obstructions
- damages
- cleanliness
- proper fit
3. If any of the above problems have been observed, stop fan(s)
and pump(s) and remove eliminators.
4. Clean eliminators from debris and foreign matter. Remove dirt
and obstructions. Replace damaged or ineffective eliminators.
5. Install eliminators and ensure they fit tightly with no gaps.
!
DO NOT STEP ON ELIMINATORS.
WATER DISTRIBUTION
The inspection procedure is as follows :
1. Shut off the fan(s), but leave the pump(s) running.
2. Check and adjust spray pressure, if required.
(not applicable for coil models with standard pumps)
3. Remove the eliminators.
4. Check to see if the nozzles are producing the spray pattern
shown in figures below
5. Clean water distribution from dirt and debris. Ensure spray
branches and nozzles are in place and clean. Replace damaged
or missing nozzles.
6. Install eliminators and ensure they fit tightly with no gaps.
7. Start fan(s) and pump(s).
FAN SHAFT
The exposed areas of the fan shaft are coated with a soft seal for
added corrosion protection. It is recommended that the coating be
inspected for continuity quarterly or at least every 6 months. Any
signs of surface corrosion must be treated. This involves:
1. Removal of the protective coating with a suitable cleaning
medium
2. The removal of any surface corrosion with emery cloth
3. The re-coating of the shaft with soft seal.
FAN MOTOR
During operation it is required to clean the outside surface of the
motor at least every 6 months (or more often depending on site
conditions) to ensure proper motor cooling. Do not wash down the
motor unless it is IP 66 rated. On a quarterly or six monthly basis
check:
- Electric connections
- Motor protection devices
- Check amp draw
- Motor bearings for noise/overheating
- Motor holding bolts
- External surface of motor for corrosion
ELECTRIC WATER LEVEL CONTROL PACKAGE (OPTION)
The electric water level control package (optional) maintains a
constant water level in the cold water sump independent of cooling
load changes and water supply pressure variations. Ensure every six
months that all components (valve, float switches) are operational
and clean.
FAN SHAFT BEARINGS
The fan shaft is supported by ball bearings (see Figure below).
Lubrication
Figure 6: Nozzle Spray Distribution Type Cooling Tower
Figure 7: Nozzle Spray Distribution Type Closed Circuit Cooling Tower or
Condensor
