3
• Use the “COM” terminal to connect both the grounded side of the 24VAC and the negative side of the
0-10VDC output signal circuit.
•
Connect the positive lead of the 0-10VDC output signal circuit to the “OUT” terminal.
•
The pressure transducer and the Setpoint control come from the factory con
fi
gured per the original order. See
the System Operation section below for details on changing the pressure control range.
Automation Control Unit (ACU)
:
The purpose of the ACU is to receive the 0-10VDC signal from the setpoint control and vary the output of the EC
motor accordingly. The ACU is capable of operating the motor without signal input during system balancing. It can
also be con
fi
gured to operate the motor at a pre-set output should the setpoint control signal fail for any reason.
Refer to the ACU Control Speci
fi
cation Sheet for detailed instruction on how to use the ACU.
Signal Connection:
•
Connect the positive 0-10VDC signal line from the setpoint controller to the tab marked “Signal” on the ACU.
This line corresponds with the “Y2” terminal on the setpoint controller.
• Connect the negative 0-10VDC signal line from the setpoint controller to the tab marked “Common” on the
ACU. This line corresponds with the “G0” terminal on the setpoint controller. NOTE: the “Neutral” and
“Common” tabs of the ACU are internally connected. So, if the ACU and the setpoint control in your system
are sharing a power supply, you can avoid running a wire for the negative 0-10VDC signal circuit.
Con
fi
guration and Operation:
•
Verify that the jumper on the back of the ACU is set to “Opt.”
•
The ACU comes from the factory in “startup mode.” This is intended to aide in the system balancing process.
More details on how to utilize the startup mode can be found in the ACU Control Speci
fi
cation Sheet. If you
wish to get the ACU out of startup mode, simply power cycle the ACU 5 times while there is a positive voltage
between 0.1 and 10 VDC present across the “Signal” and “Common” tabs.
Setpoint Control:
The purpose of the Setpoint control is to receive a signal from the pressure transducer, compare it to the user-de-
fi
ned setpoint, and output a signal to the ACU to make the appropriate fan output adjustment. The setpoint control
is available in two installation options. The DN33 is designed for DIN rail mounting and the IR33 is intended to be
panel mounted. The IR33 has an IP65 index of protection when properly installed in a panel. The IR33 can also be
shipped mounted in a NEMA 4 enclosure.
Installation:
•
If you have a DN33 controller, follow the applicable codes to install your unit using a standard DIN rail.
•
If you have a IR33 controller, install the unit into an enclosure with a 71mm X 29mm cutout. Or, if purchased
in a NEMA 4 enclosure, fasten the enclosure securely to a
fl
at surface.
Power and Signal Connection:
•
Refer to the diagram on the setpoint controller to locate the termination points below.
•
The setpoint controller is to be powered by 24VAC.
•
Connect the hot side of the 24VAC to “POWER SUPPLY” terminal “G”
•
Connect the grounded side of the 24VAC to “POWER SUPPLY” terminal “G0”
•
Connect the signal line from the “OUT” terminal of the pressure transducer to “+B1” on the setpoint controller.
• Connect the signal line from the “COM” terminal of the pressure transducer to “GND” on the setpoint
controller.
•
Connect the positive lead of the output signal circuit to “AO2” terminal “Y2”.
•
Connect the negative lead of the output signal circuit to “AO2” terminal “G0”.
