BAC PCT Series, Operation & Maintenance Manual

Page: 13 / 38

7
W W W . B A L T I M O R E A I R C O I L . C O M . A U
M A R 1 0 8 - 2
PCT COOLING TOWER
Detailed Component
Maintenance Procedures
COLD WATER BASIN
FAN
FAN DRIVE SYSTEM (BELT DRIVE UNITS)
FAN DRIVE SYSTEM (DIRECT DRIVE UNITS)
FAN MOTORS
FAN SHAFT BEARINGS
LOCKING COLLARS
FAN SHAFT
ACCESS DOOR
LOUVRES AND ELIMINATORS
WATER DISTRIBUTION AND HEAT TRANSFER SECTION
WATER LEVEL CONTROL
Detailed Component
Maintenance Procedures
Cold Water Basin
Water Levels
Inspection & Maintenance
Cold Water Basin
As water circulating through the cooling tower is cooled, it collects in the
cold water basin and passes through the suction strainer into the system.
Water Levels
Model Number At Overflow Level (mm) At Operating Level (mm)
All PCT models except
PCT-1111
443 343
PCT-1111 548 448
Table 1. Cold Water Basin Water Levels
• The values shown in Table 1 are relative to the base of the unit.
• The make-up valve controls the operating level, which is maintained
at the levels shown in Table 1 .
• The operating water level in the cold water basin will vary with
system thermal load (evaporation rate), the bleed rate employed,
and the make-up water supply pressure.
• Check the operating water level monthly, and readjust the float
when necessary to maintain the recommended operating level.
• Consult “Water Level Control” on Page 20 for information on how to
set and maintain basin operating level.
Inspection & Maintenance
• Inspect the cold water basin regularly. Remove trash or debris
accumulated in the basin or on the strainer.
• 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 basin as well as be a potential area for biological growth.
• When flushing the basin, leave the strainer in place to prevent the
sediment from re-entering the system.
• 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 .
WARNING:
Openings and/or
submerged obstructions may exist
in the bottom of the cold water
basin. Use caution when walking
inside this equipment.
Figure 2. Water Operating Level