©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide B - 2
Device Communication Problems
XR75CX
Refer to the XR75CX manual (P/N 026-1210) for more
information.
IPX-Expansion Modules
Refer to the iPro DAC manual (P/N 026-1727) for more
information.
T-stat
Touchscreen Thermostat
Refer to the T-Stat manual (P/N 026-1729) for more infor-
mation.
Refer to the Touchscreen Thermostat manual (P/N 026-
1739) for more information.
Energy Meter
Refer to the Energy Meter manual (P/N 026-1726) for more
information.
ACC
Refer to the ACC manual (P/N 026-4704) for more informa-
tion.
MRLDS
MRLDS-250
MRLDS-450
Refer to the MRLDS manual (P/N 026-1307) for more infor-
mation.
Refer to the MRLDS-250 manual (P/N 026-1315) for more
information.
Refer to the MRLDS-450 manual (P/N 026-1316) for more
information.
Mechanical Overrides
Check continuity tester - verify if the override is
showing a closure.
X Line Condensing Unit Refer to X Line AE5-1412 User Manual
I/O Network Problems
I/O board not getting power.
Check I/O board power if the green STATUS light is
ON. If not, check power wiring connections, and use
a multimeter to verify the board is getting 24VAC.
Reset power to board.
I/O board not communicat-
ing or will not come online.
Check I/O network connections:
1. Check wire polarity (positive to positive/negative
to negative).
2. Check for broken or loose wires.
Dip switches are set
incorrectly.
Check I/O board network dip switches.
Verify network ID number is not a duplicate and that
baud rate switches are set to 9600. (If switches are
wrong, make changes and then reset the controller).
Terminating resistance
jumpers are set incorrectly.
Check for proper setting of terminating resistance
jumpers. Network segment should be terminated on
the two endpoints of the daisy chain and untermina-
ted everywhere else.
Boards are not powered. Check Network/Power voltages.
SYMPTOM POSSIBLE PROBLEM SOLUTION
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