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Operation and Maintenance Instructions
8. Fan Belt Adjustment” section on page 15.
9. Lubricate fan shaft bearings prior to seasonal start-up.
10. Turn the fan(s) and pump(s) by hand to insure they turn freely without obstructions.
11. Visually inspect the fan blades. Blade clearance should be approximately 10 mm (6 mm minimum)
from tip of blade to the fan cowl. The fan blades should be securely tightened to the fan hub.
12. If stagnant water remains anywhere in the system including “dead legs” in the piping, the unit must
be disinfected before the fans are energized. Please refer to ASHRAE Guideline 12-2000 and CTI
guideline WTP-148 for more information.
13. Fill the cold water basin manually up to the overflow connection.
After the unit has been energized, check the following:
1. Fill the cold water basin to the proper operating level. See “Operating Level of Cold Water Basin”
section for more details.
2. Adjust mechanical float valve to ensure continuous operation at proper water level.
3. Verify fan is rotating in proper direction.
4. Start the spray water pump and check for proper rotation as indicated by the arrow on the front
cover.
5. Measure voltage and current on all three power leads of pump and fan motor. The current must not
exceed the motor nameplate full load amp rating multiplied by the service factor.
6. Adjust bleed valve to proper flow rate. Maximum bleed off rate is 0.4 l/s per 1000 kW of heat
rejection. Consult your qualified water treatment specialist to determine the appropriate bleed rate
for your situation.
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