Distech Controls ECB-VAV - Page 67

LonWorks Communication Bus Fundamentals
Network Guide 65
Figure 39: Power wiring - 24VDC: Maintain Consistent Polarity with all Controllers' Power Connections
Figure 40: Power Wiring example
Contr oll er 2
Contr oll er 1
24V AC/DC
24 V C OM
Fuse: 4 A Max .
Fast Acting
OPTIONAL : Connect to Electrical System
Gr ound - At Power Supply Only
24V AC/DC
24 V C OM
24 VD C
24 VAC
AC Power
Source
24 / 120 / 208 /
240 / 277 / 347 /
480 VAC, 1Ø, 2-
Wire plus Ground
24V COM
24V AC/DC
BACnet Device
Power Supply
Fuse: 4A Max.
Fast Acting
C
RC
BACnet Thermostat
24 VAC/COM
to Ground –
At Transformer
Only
(OPTIONAL)
Maintain consistent
polarity when connecting
controllers and devices to
the transformer.
The 24V COM / C
terminals of all devices
must be connected to the
power supply bus that is
grounded.
24V COM
24V AC/DC
BACnet Device
GND
24V COM
24V AC/DC
BACnet Device
GND
Ground connection
is isolated from
24V COM
(OPTIONAL)