12
R
EV
.
12-21
No Display: If the liquid crystal display does not illuminate upon
turning on the chiller, the internal 12 or 24VDC power supply has
failed, the diaphragm pump has failed, or the LCD display has
failed.
Contact Sonics for a RMA number to return the unit for
replacement of the power supply, diaphragm pump, or display.
Temperature Control Poor: If no other alarms are present, poor
temperature control indicates the heat load is too great for the chiller,
the TE cooling/heating engine is not receiving power, the PID
constants have been corrupted or the chiller needs repair.
First check
the PID constant values shown section 5.2 match the factory
defaults. If not, change the values to the default values. Otherwise,
contact Sonics for technical support.
Important:
The tank level low alarm will automatically reset when
the tank is filled. The RTD, Fan and Pump failure alarms will not
reset until the system power is turned off.