Figure 3: Zone bus terminal block wiring
Table 2: Zone bus daisy chaining configuration
1Terminating device on the zone bus
2Zone bus terminal block plugs
3Daisy-chained device on a zone bus segment
4Connects to the next device on the zone bus.
Note: The zone bus shield (SHD) terminal is isolated
and can be used to connect (daisy chain) the shields
for zone bus wiring.
Sensor bus terminal block
The sensor bus terminal block is a brown, removable, 4-
terminal plug that fits into a board-mounted jack.
Wire the removable sensor bus terminal block plugs
on the lower port of the dual stacked connector to the
controller, and other sensor bus devices in a daisy-chain
configuration using a 4-wire twisted, shielded cable as
shown in the following figure.
Figure 4: Sensor bus terminal block wiring
Table 3: Sensor bus daisy chaining configuration
1Terminating device on the sensor bus
2Sensor bus terminal block plug on the terminating
device
3Daisy-chained device on a sensor bus segment
4Sensor bus terminal block plug on the daisy-chained
device
5Cable shield connection
6Connects to the next device on the sensor bus.
Note: The PWR terminal supplies 15 VDC. The PWR
terminal can be used to connect (daisy chain) the 15
VDC power leads on the sensor bus.
Supply power terminal block
The 24 VAC supply power terminal block is a gray,
removable, 3-terminal plug that fits into a board-mounted
jack on the top right of the controller.
Wire the 24 VAC supply power wires from the transformer
to the HOT and COM terminals on the terminal plug, as
shown in the following figure. The middle terminal on the
supply power terminal block is not used.
Figure 5: 24 VAC Supply Power Terminal Block
Note: The supply power wire colors may be different
on transformers from other manufacturers. Refer to
the transformer manufacturer’s instructions and the
project installation drawings for wiring details.
Setting the VEC address using the
local display
To set the VEC address using the local display, complete
the following steps:
1. To access the menu, press the ENT (Enter) button.
2. Navigate to the Controller menu with the up and
down arrows, and press the ENT button.
3. In the Controller menu, navigate to Network and
press the ENT button.
4. In the Network Parameters section, navigate to
Address and press the ENT button.
The display shows the default address value.
5. Press the ENT button.
The address blinks.
6. Use the up or down arrow to increase or decrease
the address to the value you want. Press the ENT
button.
The address stops blinking and the display shows
the old address.
7. Press either the up or down arrow. The screen
refreshes to the new address.
VEC100 Generic RTU Controller, Staged Heating and Modulated Cooling Quick Start Guide2
