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Figure 13:
Maximum number of ECY-VAV devices on a daisy-chain at evenly spaced intervals
Laboratory testing conditions for the above graph are as follows:
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Distance between each VAV is evenly spaced along the entire wire length
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Transformer specification: 100VA (120/24VAC)
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Tested at room temperature with low voltage line conditions: 108VAC (50Hz)
Daisy-Chain Wiring
Use an external fuse on the 24VAC side (secondary side) of the transformer, as shown below to protect all controllers against power line spikes.
Maintain consistent polarity when connecting controllers and devices to the transformer. That is, the COM terminal of each controller and each peripheral
should be connected to the same terminal on the secondary side of the transformer.
The COM terminals of the controller are internally wired to the ground terminal of the power supply connector. Connecting a peripheral or
another controller to the same transformer without maintaining polarity between these devices will cause a short circuit.
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