Chapter 7 – Maintenance
Page 7-4
TestEquity 1007H Temperature Chamber
How to Verify the Performance
(Non-controlled humidity mode)
These tests verify the performance of the heating, cascade refrigeration mode, electrical controls,
F4T/F4 Controller, and air circulation systems. The chamber should meet all published
performance specifications for non-controlled humidity conditions if all of these tests are
successfully passed. These tests assume that the F4T/F4 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 –75°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, approxi23°C.
2.
Set the F4 Controller temperature set point to +85°C. F4T Humidity button or F4 Digital
Output 2 must be Off. Turn the Master Switch ON.
3.
The Heat Light should be ON continuously and the Cool and Humidity lights should be OFF.
4.
The chamber should heat up to about +80°C and begin controlling (Heat Light cycles
ON/OFF) within 7 minutes. The chamber temperature should slowly increase and stabilize to
+85°C. It should NOT overshoot 85°C by more than a few tenths of a degree, and
the compressors should NOT need to turn ON in order to ma85°C.
5.
After stabilization, the chamber temperature should vary no more than ±0.5°C, or a total of
1°C.
6.
Let the chamber stay at +85°C for two hours.
7.
After two hours at +85°C, set the F4T/F4 Controller temperature set point to –65°C.
8.
The high-stage compressor should turn ON within a few seconds. Then, the low-stage
compressor should turn ON within approximately 30 seconds, and the Cool Light should be
ON continuously and the Heat Light should be OFF.
9.
The chamber should cool down to about –60°C and begin controlling (Cool Light cycles
ON/OFF) within 55 minutes.
10.
The chamber temperature should slowly decrease and stabilize to –65°C. It should NOT
undershoot beyond –65°C by more than a few tenths of a degree, and the compressors should
NOT need to turn OFF in order to maintain –65°C.
11.
After stabilization, the chamber temperature should vary no more than ±0.5°C, or a total of
1°C.
12.
Set the F4T/F4 Controller temperature set point to –73°C. The chamber should approach
–73°C and control (Cool Light cycles ON/OFF) within approximately 5 minutes.
13.
Set the F4T/F4 Controller temperature set point to +23°C. The chamber should begin to heat
up. The compressors should turn off within approximately 1 minute.
14.
This concludes the chamber performance verification tests.
15.
Let the chamber heat up to +23°C before turning the Master Switch OFF.
