Problem 11: Chiller Loss Of Communication With Starter And The Igv Calibrates; Problem 12: Chiller Loss Of Communication With Starter Or Circuit Loss Of Communication With Chiller Diagnostics; Problem 13: Clear Language Display Won't Go Into Demo Mode; Problem 14: Communication Diagnostic; None Or Degraded Communications - Trane CVHE Troubleshooting Manual

Problem 11: Chiller Loss of Communication with Starter and the IGV calibrates.

Corrective Action:
1 IPC to Starter module disconnected or reversed.
2 Starter module not powered up.
3 Verify that a good ground exists between all modules including the CLD that needs a
dedicated green wire ground.
Problem 12: Chiller Loss of Communication with Starter or Circuit Loss of Communication
with Chiller Diagnostics
Corrective Action:
1 The 120 VAC side of the 3KVA transformer should be grounded at only one spot and it is in
the Starter. Both the 120 VAC and the 24 VAC in the UCP should not be grounded.
2 Verify the IPC wire is shielded twisted pair between the Starter and Chiller modules and its
shield is grounded at J1-6.
3 Verify there is a dedicated ground between the remote starter and the chiller.
4 Verify that a good ground exists between all modules including the CLD that needs a
dedicated green wire ground.

Problem 13: Clear Language Display won't go into Demo mode.

Corrective Action:
1 You must press Custom report and Compressor report at the same time while the display is
showing software part number on power-up. It will not go into Demo mode if there is IPC
communication.

Problem 14: Communication diagnostic; None or Degraded Communications.

Corrective Action:
1 Starter module must have the A phase on pin 2 of J2 24 Vac
2 IPC wires must be connected
3 IPC wires must have correct (+ -) polarity on J1.
4 The TCI and CLD modules have LEDs to indicate the sending and receiving of chiller
packets. Green (RxA) is receive and should be blinking constantly. Red (TxA) is send and
blinks every 1-2 seconds.
Problem 15: Loss of Communication with Starter Diagnostics at Startup with no Inlet
Guide Vane action. Mode is "Resetting" and can move through the menus.
Corrective Action:
1 IPC to Starter module disconnected or reversed
2 Starter module not powered up.
3 Verify that a good ground exists between all modules including the CLD that needs a
dedicated green wire ground
CVHE-SB-32A 11