Air Chiller System (ACS) and Chiller Panel Getting Started Guide for the DMA 850 Page 55
NOTE: Turn the unit off by using the On/Off switch, not the Event control. The Event control only turns
off the airflow and will not allow the system to defrost.
Troubleshooting
Issue Reason Action
Compressor shuts OFF and then turns
itself back on in 3-4 minutes
Low voltage
High ambient
temperature
Dirty or blocked
condenser fins
Fan out of order
Check the voltage on the unit while it is under-
load. The voltage must be within 5% of the volt-
age listed on the serial tag on the back of the
unit.
Check room temperature and compare with the
Ambient Air Requirement listed in Installation.
Take steps to reduce this temperature if it is too
high.
Clean condenser
Check for operation of fan (you can feel the air
being drawn across the condenser). If it isn’t
working, contact TA Instruments.
Compressor fails to restart after it has
been shut off
High pressure/tem-
perature in the
refrigeration sys-
tem
Wait 45 minutes and try starting the unit again.
Gradual loss of temperature Frost build-up
inside ACS
Dirty or blocked
condenser fins
High ambient
temperature
Loss of
refrigerants
Power down the ACS (see page 52
) and purge
with dry gas overnight. If using the Combined
DHR/DMA Air Chiller Panel, check the flow
indicator ball. If the ball is at the bottom of the
U, the flow is restricted (see Figure 47
).
Clean the condenser fins.
Check room temperature and compare with the
Ambient Air Requirement listed in installation.
Take steps to reduce this temperature if it is too
high.
Call TA Instruments.
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