Technical information

Portable Chillers UGH024/1103
6-20 TROUBLESHOOTING
Before an alarm can be reset with the acknowledge key, the
alarm condition must be cleared. To acknowledge an alarm is
press and hold the Shift button for 3 seconds.
When the temperature falls below the Low To Process
Temperature cut out, the compressor shuts off. The Alarm
light illuminates and the PLC displays "Low Temperature
Cutout". The process or recirculation pump remains running
until the Stop button is pressed.
When the To Process Temperature increases to 95°F (35°C)
the compressor shuts off. The Alarm light illuminates and the
PLC displays "High Temp Safety (Temp>95°F)". The process
pump remains running until the Stop button is pressed.
If the temperature rises above the setpoint a high temperature
deviation occurs. The degrees Fahrenheit deviation is a vari-
able from 3 to 20, adjustable on a Setup screen. If a high devi-
ation is present the Alarm light illuminates and the PLC dis-
plays "High Temperature Deviation". The alarm can be
cleared after the temperature drops below the high tempera-
ture deviation setpoint or the high deviation is changed to a
larger value and the alarm is acknowledged. Acknowledge the
alarm by pressing the Stop Chiller button.
If the low water level switch indicates a low water level, the
compressor and process pump will shut down. The "alarm"
light illuminates and the PLC indicates "Low Water Tank
Level". The process pump will remain running until the Stop
button is pressed.
If the flow switch (FS-1) detects a low flow condition, the
compressor and process pump will be shut down. The "alarm"
light illuminates and the PLC indicates "Flow Fault". The
process pump will remain running until the Stop button is
pressed.
When the refrigerant suction pressure (PT-1) goes below 28
PSIG the compressor will be shut off. The "alarm" light illu-
minates and the PLC indicates "Low Suction Pressure" for the
compressor on a single compressor system and compressor 1
on a dual compressor system. The PLC will indicate "Low
Suction Pressure 2" for compressor 2 on a dual compressor
system. The process pump will remain running until the Stop
button is pressed.
PLC CONTROL
ALARM
CONDITIONS
Low Temperature Cutout
Higm Temp Safety
(Temp >95°F)
High Temperature Deviation
Low Water Tank Level
Flow Fault
Low Suction Pressure
Low Suction Pressure 2