Air Chiller System (ACS) and Chiller Panel Getting Started Guide for the DMA 850 Page 48
Starting the ACS
NOTE: Do not turn off the unit and immediately turn it back on. After the compressor has shut down,
allow 45 minutes for the internal pressures to equalize before restarting the unit.
1 Turn the Quarter-Turn Valve to the ON position (parallel to the line).
2 Adjust the Inlet Pressure Regulator to 100 psi.
3 Adjust the Bypass valve flow: Open the valve by turning the manual knob on the back of the ACS to
allow air flow to dry out the line. Noise level will increase with increased flow rate. Allow the dry gas
to purge through the ACS for 10–15 minutes before powering on the ACS. This will ensure that the ACS
internal tubing is free of moisture, which, if present, could freeze when the ACS is turned on.
Figure 46 Bypass valve.
NOTE: This is only for drying the internal tubing of the ACS before and after use. The bypass purge will
be turned off automatically when the ACS is powered on and will turn on automatically when the ACS is
powered off. See Shutting Down, Purging, and Defrosting the ACS
for more information.
4 Turn the power switch on the front of the Air Chiller to the On position. Wait 60 minutes before operating
the system. The built-in timer will not allow flow through the ACS until all the stages have started. See
Internal Timer
for more information.
NOTE: Before turning the unit on for the first time, make sure the full length of the transfer hose has been
above the top of the ACS unit for more than 24 hours.
5 After mounting the sample, slide the appropriate ACS Clamp Screen over the clamp. See Figure 31
and
Figure 32
.
6 Close the DMA 850 furnace and set a temperature of 25°C from the touchscreen. Ensure that ACS is
selected as the cooling accessory. Cool gas will start flowing through the furnace as soon as the internal
timer condition is satisfied.
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