FloAire Demand Control Ventilation System - Manual (Page 9)

A0023662
May 2014 Rev.5
9
Low Voltage Wiring
Low voltage field wiring consists of Duct and Room Temperature sensors, ECM motors, 0-10VDC output,
24VDC input, or Modbus communication over CAT-5 cables for HMI(s) and remote equipment.
Additionally, panels can be ordered with Building Management Options. Refer to the Building
Management Owner’s Manual, if equipped, for low voltage building management wiring requirements.
Low voltage wiring must be run on the left hand side and directly terminated on the terminals located on
the ECPM03 board.
WARNING: Low voltage wires should never be run together with high voltage wires.
1- Room temperature sensor(s): For all installations, at least 1 room temperature sensor must be
installed in a safe location, free of influence from external heat sources. It should be indicative of the
average kitchen temperature away from the appliances. 2-wire 18 AWG thermistor cable must be
used. The room temperature sensor shall be wired according to the installation wiring schematic,
terminals
“T1A” and ”T1B”.
2- Duct temperature sensors: For all installations excluding a single hood with factory risers and a
hood mounted panel, duct mounted temperature sensors will need to be wired in the field. 2-wire 18
AWG plenum rated thermistor cable must be used. The temperature sensor should be wired to
terminal blocks as indicated on the installation wiring schematic.
3- HMI is connected to the ECPM03 board through a CAT-5 cable. The HMI has two RJ-45 connectors
connected together for Modbus. The HMI connects to port J4 or J5 (RJ-45) of the ECPM03 board.
The other RJ-45 port of the HMI will typically be occupied by a RJ-45 end-of-line terminator (Part #
EOL120A).
4- Two end-of-line terminators (Part # EOL120A) are included in each panel. They are typically
plugged in at the factory on J3 and either on port J4 or in the back of the first HMI. If another HMI or
other equipment need to connect to a port occupied by an end-of-line terminator, it shall be removed
and place on the HMI or equipment that became connected at the end of the Modbus network.
5- If other pieces of equipment such as PCU Advanced Filter Monitoring (AFM) are connected to this
panel, a cat-5 cable will also be used to run the Modbus communication between these devices. The
cable would be plugged in port J3 of the ECPM03 board. The end-of-line terminators should then be
relocated from J3 to the PCU AFM module.