Distech Controls ECLYPSE ECY-VAV Installation Manual page 7

VAV Box
Damper Minimum :
>1.50" >40.00
Shaft
Sliding Grommet
Opening for
Damper Shaft
Mounting Screw
Inches Millimeters
Figure 12: Standard Mounting Method: Mounting a controller on a damper shaft
Power Wiring (ECY-VAV Model)
Voltage: 24VAC/DC; ± 15%, Class 2
For terminal block connector wiring best practices, see General Wiring Recommendations [pg. 2].
See the VAV-Smart Room Control Device Calculator available for download from our website to determine the power requirements for each ECY‑VAV
model being installed.
ECY-VAV-PoE model controllers are powered by their network connection only. See Communications Wiring [pg. 12].
This is a Class 2 Product. Use a Class 2 transformer only (rated at 100VA or less at 24VAC) to power the controller(s).
When calculating a controller's power consumption to size the 24VAC transformer, you must also add the external loads the controller is going to supply,
including the power consumption of any connected subnet modules (for example, for Allure EC-Smart-Vue sensors).
It is recommended to wire only one controller per 24VAC transformer.
If only one 24VAC transformer is available, determine the maximum number of daisy-chained VAVs that can be supplied on a single power cable sup-
plied by a 100 VA transformer, according to the controller's expected power consumption including external loads, the cable's wire gauge, and the total
cable length from the following table. Any installation condition that is outside of the parameters of the following graph should be avoided.
Daisy-chaining power to controllers is not permitted when a controller's expected power consumption including external loads is over 15VA. In this case
the controller must be connected to the 24VAC transformer in a star topology. The transformer must be installed in close proximity to the controller ac-
cording to the cable gauge and total load.
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