Baltimore Aircoil Company Trillium Series Operating And Maintenance Instructions Manual page 18

Model
DFCV-EC9122-*
DFCV-EC9123-*
DFCV-EC9124-*
DFCV-EC9125-*
DFCV-EC9126-*
DFCV-EC9127-*
ADIABATIC PRE-COOLER SET-POINT
The operation of the adiabatic pre-cooling sections is controlled by the digital controller.
The controller should limit the start and stop to maximum 1 per day per adiabatic pre-cooling side, this to increase
the service life of the pre-cooler media. If the number of daily starts and stops exceeds 1 per day, it is
recommended that the controller's set points are adjusted. The pre-cooler can be operated to allow a higher number
of starts and stops which could reduce total annual water consumption, however, this practice will drastically
reduce the service lifetime of the adiabatic pre-cooler media.
ELECTRICAL CONNECTIONS
Check and tighten electrical contacts if required before commissioning the unit. Transport may loosen some of the
contacts, posing a risk for overheating or voltage drops. Also during operation, half-yearly checks are
recommended.
ROTATION OF FANS
Fans must rotate without obstruction in the direction indicated by arrows on the equipment.
MOTOR VOLTAGE AND CURRENT
Check the voltage and the current of all three legs of the fan motors. The current should not exceed the nameplate
rating. After prolonged shutdown the motor insulation should be checked with a Megger insulation tester prior to
restarting.
The voltage must not fluctuate more than +/-10% and the imbalance between phases must not be greater
than +/-2%.
UNUSUAL NOISE AND VIBRATIONS
Unusual noise and/or vibration are the result of malfunctioning of mechanical components or operational problems
(e.g. unwanted ice formation). If this occurs, a thorough inspection of the entire unit followed by immediate
corrective action is needed. If required, consult your local BAC Balticare representative for assistance.
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W W W . B A L T I M O R E A I R C O I L . E U
Number of fans
4 fans
6 fans
8 fans
10 fans
12 fans
14 fans
Recommended adiabatic pre-cooler water flow rates
Do not run/start the fan motor(s) when there is no heat load.
Minimum pre-cooler water flow
CAUTION
per unit
14 l/min
22 l/min
28 l/min
36 l/min
44 l/min
50 l/min