YCCS TEC2603-4 BACnet® MS/TP Networked Multi-Stage Thermostat Controllers Installation Instructions
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676292-YIM-A-0111
Wiring
When an existing thermostat controller is replaced,
remove and label the wires to identify the terminal
functions. When a TEC2603-4 Thermostat Controller is
replaced, simply remove the old screw terminal blocks
and reinsert them onto the PCB of the replacement
thermostat controller.
To wire the thermostat controller:
1.
Strip the ends of each wire 1/4 in. (6 mm) and
connect them to the appropriate screw terminals as
indicated in Figure 5.
Note:
If multiple wires are inserted into the
terminals, be sure to properly twist the wires
together prior to inserting them into the terminal
connectors.
2.
Carefully push any excess wire back into the wall.
Note:
Seal the hole in the wall with fireproof
material to prevent drafts from affecting the
ambient temperature readings.
3.
Reinsert the screw terminal blocks onto the PCB.
4.
Reattach the thermostat controller cover to the
mounting base (top side first).
5.
Use a Phillips-head screwdriver to reinstall the
security screw on the bottom of the thermostat
controller cover.
Connecting the YCCS System Bus
To connect the YCCS System Bus:
1.
Set the YCCS System Bus address of the
thermostat controller per the engineering drawings
and test for bus voltage and polarity prior to wiring
the YCCS System Bus. Use the
Com addr
parameter to set the system bus address for the
thermostat controller.
2.
Observe the polarity when connecting the bus
wires to the thermostat controller.
3.
After the bus wires are connected to the first
thermostat controller, continue in a daisy-chained
fashion to the next YCCS System Bus device.
Note:
The bus wiring must be twisted-pair lines.
Do not run the bus wiring in the same conduit as
line voltage wiring (30 VAC or above) or other
wiring that switches power to highly inductive loads
(such as contactors, coils, motors, or generators).
System Communication RS-485 serial protocol Bus
segments requires proper End-of-Line (EOL)
termination to reduce interference from signal bounce
back on the Bus segment. The system requires at least
one termination at either end of the Bus segment. The
System Manager ships with the EOL switch in the
factory default, ON (up) position. Ensure that this
device is EOL on one end of the System Bus segment.
See the
End-of-Line (EOL) Terminations
section for
more information.
The thermostat controller has automatic baud rate
detection. Do not exceed the maximum number of
devices allowed on a YCCS System bus (38 devices
total, including up to 24 TEC Series thermostat
controllers).
Be sure that the wiring terminations are set correctly
and that all communication wiring is daisy-chained with
no taps. See the
Troubleshooting
section for
information on correcting physical bus problems.
Figure 5 shows TEC2603-4 Thermostat Controller
wiring; see Figure 6 for a YCCS communication riser.
!
CAUTION: Risk of Electric Shock.
Disconnect the power supply before
making electrical connections to avoid
electric shock.
!
CAUTION: Risk of Property Damage.
Do not apply power to the system before
checking all wiring connections. Short
circuited or improperly connected wires
may result in permanent damage to the
equipment.
IMPORTANT:
Make all wiring connections in
accordance with local, national, and regional
regulations. Do not exceed the electrical ratings of
the TEC2603-4 Thermostat Controller.
