Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24Pipes valves and fittings should be inspected for leaks cracks or scaling. Spray nozzles should be inspected for scale buildup. Obstructed nozzles should be cleaned or replaced. Coil surfaces should be kept clean and free of foreign matter. Fins can be cleaned with warm water with mild detergent and a soft brush. If using commercially available fin cleaners ensure that they are compatible with both copper and aluminum. Grills and fan guards should also be kept clean and free of excessive dust or buildup. Fan motors should be checked at regular intervals for bearing damage. Fan motor running currents should be measured and recorded to check for abnormalities. Waterglycol process fluid should be sampled and analyzed annually before the onset of freezing weather to ensure proper freeze protection. Spray pipes should be drained or heat traced and insulated to prevent pipe bursts in freezing weather. Troubleshooting After turning on power to the VIRGA III nothing happens. The display on the controller does not light up. Ensure that the controller circuit breaker is on. Ensure that transformer fuses are intact. Check that the voltage between controller power terminals 120 and COM is 120 V. If the controller is still not receiving power check for loose wire connections. The fans turn on before the water temperature is at the set point. They turn on even when the process is not running. Depending on the siting of the cooling tower the temperature sensor may be exposed to heat from sources outside the system. For example a thermocouple in direct sunlight on a black asphalt rooftop may read slightly higher than the process water. In this case NIMBUS recommends insulating the thermowell such as with foam insulation wrap. The temperature controller does not read exactly 32F when submerged in ice water. If the reading error is less than 2F there is no cause for alarm. If the reading error is more than 5F ensure that all wire connections between the sensor and controller are secure and ensure that the cable insulation is intact inside the tower. If no other problems are present the sensor may have been damaged and should be replaced. Questions Call 844-NIMBUS3. 5