CVHE-SB-32A 12
Problem 16: Loss of Communication or Intermittent Communication between any of the
modules. (Chiller, Starter, Tracer, Circuit, Stepper, Options, Purge, etc.)
Corrective Action:
1 Verify the Chiller and CLD versions are compatible with Tracer.
2 Reference Trane CTV-CSB-90 and 92 for module compatibility numbers.
3 ICS address at CLD should match with Tracer.
4 Are the DIP switches set correctly? They should be all off for COM 3; OFF-ON-OFF for
Comm 4.
5 In the Tracer module, verify the IPC LEDs near J1 are blinking. Red LED is transmit and
should be blinking constantly showing lots of IPC action (even if not for the TCI). The green
LED is for receive and should only be blinking rapidly in a row once every 1-2 seconds which
is the IPC cycle time.
6 Verify the COM 3 LEDs near J3 are blinking. Red LED is transmit and should be blinking
showing lots of COM 3 action (even if not for the TCI). The green LED is for receive and
should only be blinking rapidly in a row once every minute which is the Tracer cycle time.
7 The Starter module or other modules are not grounded well. The IPC needs the modules to
be grounded together.
8 Go to service test menu and verify that Chiller thinks a TCI 4 is installed.
9 Look at the voltage of each line with respect to ground. A logic 0 should be .5 V or less; a
logic 1 should be 4.5 volts or more.
~ For COM 3 lines less that 1000 Ft., a 300 Ohm terminating resistor put across the two wires
is needed. Install the resistor first at the chiller end of the link.
~ Radio frequencies generated from sources like airplanes and radio towers may be inducing
noise in the communication lines. Tie matched capacitors of around 200pF at either ends or
both ends from each line to ground.
10 De-install TCI option and power up and see it self install within 10 seconds. If not, something
is wrong in TCI module.
11 De-install Tracer option and power up and see if it self installs within three minutes. If not,
something is wrong with the Tracer side.
12 Tracer option is self-installed. No need to enable it manually. If enabled manually and no
Tracer on the communication line, then a Loss of Communication with Tracer will be called. If
a Tracer is put on communication line, then communication side diagnostics are called: Loss
of Communication with Tracer.
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