8 Diagnostic Testing and Troubleshooting
240 July 29, 2013, 715003794 Rev. B
You can monitor the sample heater/cooler temperature by connecting a chart
recorder to the Chart Out terminals on the rear panel of the separations
module.
Complete these tasks before you perform the test:
• Remove all carousels and vials from the sample compartment.
• Confirm that the column heater or column heater/cooler (if installed) is
not in use.
• Ensure that the sample compartment temperature is between 18 and
28 °C.
Requirement: To ensure this test’s accuracy, do not open the sample
compartment door during the test.
To perform the sample heater/cooler test:
1. In the Other Diagnostics screen, select Sample Heater/Cooler, and then
press OK.
2. In the Sample Heater/Cooler screen, press Start to begin the test.
Result: The sample heater/cooler’s temperature behaves as follows:
• Equilibrates
• Ramps down (for approximately 10 minutes)
• Stabilizes
• Returns to ambient temperature
When the test ends, the Sample Heater/Cooler screen displays the pass/fail
status and the unit’s current temperature.
Defrost sample heater/cooler function
Run the defrost sample heater/cooler function to defrost the sample
heater/cooler and monitor the temperature change as the unit warms up.
Tip: The build-up of frost degrades the cooling efficiency of the sample
heater/cooler. You should defrost the sample heater/cooler if it fails to reach
the lowest recommended setpoint at ambient conditions.
You can monitor the sample heater/cooler’s temperature by connecting a chart
recorder to the Chart Out terminals on the rear panel of the separations
module.
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