Air Chiller System (ACS) and Chiller Panel Getting Started Guide for the DMA 850 Page 13
Continuous Operation
The length of time the ACS can be left running will depend on the dew point of the gas supply. The mini-
mum temperature of the internal evaporators is maintained at -130°C on the ACS-3 and -90°C for the
ACS-2. As a result, any supply with a dew point higher than this will eventually result in frost build up,
reduced gas flow, and reduced performance. If the ACS is operated for extended periods under such con-
ditions, frost accumulation may also lead to completely occluded gas transfer lines, stopping air flow and
cooling. Compressors may also shut down with increased frosting, which will lead to significantly reduced
cooling capacity and temperature control. If the supply has a pressure dew point lower than -130°C (ACS-
3) or -90°C (ACS-2), the ACS can be operated indefinitely without interruption. When used in accordance
to this guide and under normal operating conditions, the ACS should stay frost-free and be adequate for
most applications during one day of testing.
It is recommended that the unit be shut down for drying on a daily schedule. Some users may find that lon-
ger times are permissible between drying intervals. To keep the ACS frost-free, you should leave the gas
flowing through the unit after it has been powered off. See Shutting Down, Purging, and Defrosting the
ACS for more information. Extended operation without load is detrimental to the system. For this reason,
it is also advised that the ACS be shut down overnight, or during other extended periods in which it will
not be used actively.
Chiller Panel
The Chiller Panel is mounted to the side of the ACS. Each instrument temperature control system requires
its own specific Chiller panel to interface to the ACS. The Chiller Panel assembly contains all of the pneu-
matic and electronic components needed to filter, regulate, and control the compressed gas (air or nitrogen)
that is supplied to the temperature control systems.
There are different versions of the DMA chiller panels. refer to the list below to identify the model you are
using. Follow the installation instructions based on the version of the panel that you have.
• Q800 DMA Air Chiller Panel (P/N 986300.901)
• Consists of filter/dryer/regulator assembly only.
• Filter/dryer assembly is black in color.
• Compatible with DMA 850 and Q800 DMA models only.
Figure 3 Q800 DMA Chiller Panel, P/N 986300.901.
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