52 RT-SVX23D-EN
Trouble Shooting
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”.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other individual
who has been properly trained in handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when exposed to live electrical components
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,
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.
3. Utilizing “Method 1” or “Method 2” in the “System Status Diagnostic” section, check the
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.
4. If a System failure is indicated, recheck Steps 1 and 2. If the LED is not lit in Step 1, and 24 VAC
is present in Step 2, the RTRM has failed. Replace the RTRM.
5. If no failures are indicated, use one of the TEST mode procedures described in the “Unit Start-
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.
6. Step the system through all of the available modes, and verify operation of all outputs, controls,
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 verifying proper operation. Make the necessary repairs and proceed to Steps
7 and 8.
7. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the
power “Off” at the main power disconnect switch.
8. Refer to the individual component test procedures if other microelectronic components are
suspect.
System Status Checkout Procedure
“System Status” is checked by using one of the following two methods:
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