Distech Controls ECx-400 Series - Page 13

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Typical Air Handling Unit Application Wiring Diagram
ECx-400
CoolHeat
Return Air Temperature
10kΩ type II
Supply Air Temperature
10kΩ type II
Mixed Air Temperature
10kΩ type II
Supply Air Humidity
2-wire, 4-20mA
Supply Fan State
Digital contact
Return Fan State
Digital contact
Damper
Return Air Humidity
2-wire, 4-20mA
CT CT
0-10
VDC
~
+
-
0-10
VDC
~
+
-
Humidifier
A2 A1 A2 A1
To
Supply
Fan
Starter
To
Return
Fan
Starter
0-10
VDC
~
+
-
Transformer
24VAC
Fuse: 4A Max.
Fast Acting
Electrical
System
Ground
Data Bus Shields: Twist together
and Isolate with electrical tape
From ECB-600 or ECL-600
To Next ECx-400
Sub-Network
*
* 249 ohm resistor built-in for inputs configured as 4-20mA
0-10
VDC
~
+
-
Figure13: Typical Power and Network Connections