Troubleshooting - Trane TC*150-301 Installation Operation & Maintenance

Troubleshooting

ReliaTel Control
The RTRM has the ability to provide the service personnel with some unit diagnostics and system
status information.
Before turning the main power disconnect switch "Off" , follow the steps below to check the ReliaTel
Refrigeration Module (RTRM). All diagnostics & system status information stored in the RTRM will
be lost when the main power is turned "Off" .
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this section of the manual
could result in exposure to electrical, mechanical or other potential safety hazards. Always refer
to the safety warnings provided throughout this manual concerning these procedures. When
possible, disconnect all electrical power including remote disconnects before servicing. Follow
proper lockout/ tagout procedures to ensure the power can not be inadvertently energized.
When necessary to work with live electrical components, have a qualified licensed electrician or
other individual who has been trained in handling live electrical components perform these
tasks. Failure to follow all of the recommended safety warnings provided, could result in death
or serious injury.
To prevent injury or death from electrocution, it is the responsibility of the technician to recognize
this hazard and use extreme care when performing service procedures with the electrical power
energized.
1. Verify that the Liteport LED on the RTRM is burning continuously. If the LED is lit, go to Step 3.
2. If the LED is not lit, verify that 24 VAC is presence between J1-1 and J1-2. If 24 VAC is present,
3. Utilizing "Method 1" or "Method 2" in the "System Status Checkout Procedure, check the
4. If a System failure is indicated, recheck Steps 1 and 2. If the LED is not lit in Step 1, and 24 VAC
5. If no failures are indicated, use one of the TEST mode procedures described in the "Unit Start-
6. Step the system through all of the available modes, and verify operation of all outputs, controls,
7. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the
8. Refer to the individual component test procedures if other microelectronic components are
48
WARNING
proceed to Step 3.
If 24 VAC is not present, check the unit main power supply, check transformer (TNS1). Proceed
to Step 3 if necessary.
following:
System status
Heating status
Cooling status
If a System failure is indicated, proceed to Step 4. If no failures are indicated, proceed to Step 5.
is present in Step 2, the RTRM has failed. Replace the RTRM.
Up" section to start the unit. This procedure will allow you to check all of the RTRM outputs, and
all of the external controls (relays, contactors, etc.) that the RTRM outputs energize, for each
respective mode. Proceed to Step 6.
and modes. If a problem in operation is noted in any mode, you may leave the system in that
mode for up to one hour while troubleshooting. Refer to the sequence of operations for each
mode, to assist in verifyingproper operation. Make the necessary repairs and proceed to Steps
7 and 8.
power "Off" at the main power disconnect switch.
suspect.
RT-SVX25C-EN