J22 Power Input
J23, J24 Communi‐
Relay Outputs 1‐4
EOL Resistors 1‐4
The 301C controller requires a power range of 17‐27 Vac, 50/60 Hz
(8.64 VA), 18‐36 Vdc, 350 mA @24 Vdc (8.4 VA). Polarization is not
important in either AC or DC mode. The system must be grounded on
the transformer and a dedicated circuit breaker must be used.
Communication cables must be grounded using the shield terminal,
using twisted and shielded pair Belden 2‐24 AWG #9841 cable (or
The network cabling can extend up to 2000 feet (609 m) per channel.
Daisy‐chain the network cable with no T‐taps.
Connect the power supply to the controller (see
Wiring Details for cabling diagrams)
Connect communication cables to channels 1
Depending on the desired configuration, con‐
nect the relay cables to either N.O. or N.C. Re‐
lays 1 and 2 are commandable by either inter‐
nal events or by BACnet; relays 3 and 4 are
driven only by internal events.
Place the jumper over the Shutdown header
pins to reset or restart the system.
Place the jumper over the header pins to in‐
clude resistors to attenuate communication