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Problem Possible Cause Solution
Fan Does Not Run
No Power to the Fans
Cycle power on/off the unit.
Confirm that power is applied to the unit at the main disconnect.
Confirm that power is applied to each fan by checking terminals xT1, xT2, xT3 & xT4.
Check all terminals for tightness.
Check power wires at fan's housing.
Check all terminals at Modbus module for tightness.
Fan Internal Fault (For
TSDC Only)
Check the LED light on top of the fan for fault codes, refer to section 7.2 of Assembly
Instructions ECblue Basic Version UL at www.ziehl-abegg.com for more details.
Control Signal Issue
Check with a meter the control voltage at terminals -V, 10V or mA depending on control
signal.
Ensure a fan speed control signal is being sent to the unit.
Fan Spins Backwards Fan is Off/Faulty
Turn the unit off. Allow all fans to stop completely. Check all breakers and power
connections. Restart the unit and ensure all fans are operational.
Fan Does Not Respond to the
Control Signal
Communications Fault
Ensure the communications cable is connected to the controller on port J8.
Ensure the communications cable is not cut or damaged.
Ensure the communications cable is properly connected at the fan's motors.
Circuit Breaker Tripped Re-set the circuit breaker.
No Water Spray
or
Pump Does Not Run
or
Pre-Cooler Mode Doesn’t Work
Incorrect Set Point
Check the pre-cool set point on the controller, see page 41. The pump will not run if the
outside air temperature is below 40°F (4.4°C). Note: Pre-Cooler Mode will be initiated only
when outside air temperatures are above the set point.
No Water Supply
Ensure water is being supplied to the make up valve (green valve on the left).
If there is a faulty make up valve, contact your local BAC Representative for a replacement.
To check for a faulty sump float, manually raise and lower the float to ensure functionality.
Faulty Pump
Ensure the pump is receiving 120V by checking terminals 2&3 at the bottom left corner of
the control panel. For the pump to be energized, the sump needs to be filled with water and
the unit must be in Pre-Cooler Mode.
To check for a faulty drain valve, ensure the valve closes completely when unit is in Pre-
Cooler Mode.
Clogged Pump Strainer Clean the pump strainer quarterly.
Spray System Fault
Ensure that the pump's isolation valve (TSDC only) is on the open (vertical) position. See
Figure 24 on page 31.
Check for kinks or damage to the internal hoses.
Circuit Breaker Tripped Re-set the circuit breaker.
TRILLIUMSERIES™ ADIABATIC CONDENSER
Troubleshooting Guide
6
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