Chapter 7 – Maintenance
Page 7-4 TestEquity 106 & 107 Temperature Chamber
How to verify the chamber performance
These tests verify the performance of the heating, refrigeration, electrical controls, temperature
controller, and air circulation systems. The chamber should meet all published performance
specifications if all of these tests are successfully passed. These tests assume that the
Temperature Controller’s setup and tuning values have not been changed from the values as
shipped from TestEquity. Also, the Limit Controller high limit must be set to over +85°C (+88°C
would be fine), and the low limit set to below –42°C. If the chamber fails any of these tests, it
should be removed from service to prevent further damage until the cause of the problem is
determined and resolved.
1. The chamber interior should be empty and at ambient temperature, approximately +23°C.
2. Plug the chamber into a 120 VAC outlet. Turn the POWER Switch ON and the TEMP Switch OFF.
3. Set the Temperature Controller Set Point to +85.0°C and turn the TEMP Switch ON.
4. With F4 Controller: The 1A light should be ON continuously and the Controller’s 1B light should be
OFF; with F4T Controller: Left PWR bar should show 100%, Right PWR bar 0%.
5. The chamber should heat up to about +82°C and begin controlling (F4: 1A light cycles ON/OFF; F4T
Left PWR bar should show less than 100%) within approximately 8 minutes.
6. The chamber temperature should slowly increase and stabilize to +85°C. It should NOT overshoot
beyond +85°C by more than 0.5°C, and the compressor should NOT need to turn ON in order to
maintain +85°C.
7. After stabilization, the chamber should vary no more than ±0.2°C, or a total of 0.4°C.
8. Let the chamber stay at +85°C for 30 minutes.
9. After 30 minutes at +85°C, set the Temperature Controller Set Point to +23.0°C.
10. The compressor should turn ON. The chamber should cool down to about +26°C and begin
controlling (F4: 1B light cycles ON/OFF; F4T Right PWR bar shows less than 100%) within
approximately 13 minutes.
11. The chamber temperature should slowly decrease and stabilize to +23°C. It should NOT undershoot
beyond +23°C by more than 1.0°C, and the compressor should NOT need to turn OFF in order to
maintain +23°C.
12. After stabilization, the chamber should vary no more than ±0.5°C, or a total of 1.0°C.
13. Set the Temperature Controller Set Point to –40.0°C.
14. The F4 Alarm 2 light (looks like a bell with the number 2) should turn on when the chamber reaches
–35.0°C. This is an internal chamber system function, not a “fault”. There is no similar indication on
the F4T Home display.
15. The chamber should cool down from +23.0°C to –40°C within approximately 30 minutes.
16. F4: 1B light will ultimately remain OFF and the 1A light should eventually cycle ON/OFF while
maintaining –40°C. F4T: Right PWR bar will ultimately show 0% and Left PWR bar should show a
few %. The temperature should NOT undershoot beyond –40°C by more than 1.0°C, and the
compressor should NOT need to turn OFF in order to maintain –40°C.
17. After stabilization, the chamber should vary no more than ±0.2°C, or a total of 0.4°C.
18. Set the Temperature Controller Set Point to +23°C. The chamber should begin to heat up. The
compressor should turn off in 30 seconds.
19. This concludes the chamber performance verification tests.
20. Let the chamber heat up to +23°C before turning the TEMP Switch OFF.
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