Power Wiring - Distech Controls ECL-VAVS Installation Manual

Figure 10: Standard Mounting Method: Mounting a controller on a damper shaft

Power Wiring

Voltage: 24VAC/DC; ± 15%, Class 2
This is a Class 2 Product. Use a Class 2 transformer only (rated at 100VA or less at 24VAC) to power the
controller(s).
The Network Guide provides extensive information and requirements for powering a controller that uses a L
be downloaded from the Distech Controls' Documentation and Resources Portal.
It is recommended to wire only one controller per 24VAC transformer.
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 module (for example, Allure™ Series Communicating Sensors).
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 figure. Any installation condition that is outside of the parameters of the following graph should be avoided.
To maximize daisy-chaining performance, the transformer should be installed as close as possible to the first VAV. If this is not possible, then use 14
AWG wire to power the first VAV which can help reduce a voltage drop at the end of the daisy-chain.
The recommended minimum peak input voltage is 27.2V
6 / 14
VAV Box
Damper Minimum :
>1.50"
Shaft
Opening for
Damper Shaft
Inches Millimeters
p
>40.00
Sliding Grommet
Mounting Screw
ON
W network for communications. It can
ORKS