Air Chiller System (ACS) and Chiller Panel Getting Started Guide for the DMA 850 Page 52
Shutting Down, Purging, and Defrosting the ACS
1 Close the DMA 850 furnace.
2 Turn the power switch on the front of the Air Chiller to the Off position.
NOTE: It is important to power off the ACS regularly and purge with dry gas for a period of time, typi-
cally over-night. This prevents build-up of frost inside the ACS, which can slowly degrade the perfor-
mance of the Chiller or even stop operation entirely. It is recommended to power off the Chiller daily when
the ACS is used continually. Some users with exceptionally dry supply air will find that less frequent dry-
ing intervals are acceptable, possibly allowing up to a week to pass between drying cycles.
NOTE: The ACS is equipped with a normally open solenoid valve that purges the Chiller with dry gas
when turned off. This is to help prevent frosting within the ACS while it is still cold. It is best to leave the
purge gas on for a minimum of 2 hours to allow the ACS to come up to room temperature. An overnight
purge of the ACS with dry air is recommended for optimum operation.
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.
CAUTION: Do not move the flexible line when it is cold, always warm the system to ambient
(+20°C) before making any adjustments to the placement of the delivery line.
MISE EN GARDE: Ne pas déplacer la ligne flexible quand il fait froid, toujours réchauffer le sys-
tème à la température ambiante (20°C) avant de faire des ajustements à la placement de la ligne de
livraison.
Disconnecting the ACS to Use on Another Instrument
1 Follow the instructions above for Shutting Down, Purging, and Defrosting the ACS .
2 Allow the ACS to reach room temperature and dry overnight.
3 Make sure that the ACS and DMA 850 are shut down and not powered on.
4 Turn the Inlet Quarter-Turn Valve to OFF (perpendicular to the line).
5 Disconnect the event cable from the DMA 850 and ACS and replace with the jumper cable (see Figure
27). Store the event cable for future use.
6 Carefully disconnect the insulated hose from the DMA 850.
Relocating the ACS
1 Follow the instructions above for Shutting Down, Purging, and Defrosting the ACS . Make sure the ACS
is shut down and not powered on.
2 Allow the ACS coils to warm up to room temperature. This can be determined by monitoring the
temperature of the air from the ACS in the DMA 850.
3 Turn the Inlet Quarter-Turn Valve to OFF (perpendicular to the line).
4 Disconnect the Event cable from the ACS and replace it with the jumper cable. See Figure 27. Store the
Event cable for future use.
5 Carefully disconnect the insulated hose from the DMA 850.
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