Starter Module - Trane RTHD Troubleshooting Manual

Starter Module

RLC-SVD05A-EN
Over/Under Voltage
1 Switch the line power off and run a separate 120 VAC control power to the
chiller controls. With the controls powered up (Chiller mode set to Stop),
measure the common mode input voltages to the Starter module as VDC and
verify they fall within the following:
Table 7. Starter Module Potential Transformer Input DC Voltages
Starter Module Input
Terminals
J5-1 with respect to ground
J5-2 with respect to ground
J5-3 with respect to ground
J5-4 with respect to ground
J5-5 with respect to ground
J5-6 with respect to ground
2 If any of the voltages are not within the acceptable range listed in Appendix A
Table 2, then disconnect all the external wires to the J5-1 to 6 terminals. Again
measure the voltages in
If the voltages all fall within the acceptable range, then there is most likely an
error in the external wiring to the Starter module potential transformer inputs.
This includes the potential transformers themselves.
If any voltage is not within the acceptable range, then there is most likely a
problem with installation of the Starter module or with the Starter module
itself. Check the four wire LLIDs bus connection to the Starter module. Check
the 24 +/- 2.4 VDC power supply input. Insure the Starter module is grounded
via the mounting screws. If installation is correct, replace the Starter module.
Minimum Acceptable DC
Voltage(VDC)
+2.45
+2.45
+2.45
+2.45
+2.45
+2.45
Table 7..
Maximum Acceptable DC
Voltage(VDC)
+2.55
+2.55
+2.55
+2.55
+2.55
+2.55
33