Temptek CF Series - Inadequate Cooling Capacity; Sensor Troubleshooting; Coolant Pump Issues; Chiller Controller Problems

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
Page: 41
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
C. Filters.Checklterinthechilledwatercircuitandcleanifnecessary.
D. Pressure switch (or ow switch). Readjust or replace if defective.
E. Fuses and wiring. Have electrician check the fuses and wiring.
4.7 COOLING CAPACITY INADEQUATE
A. Low refrigerant charge. Check for adequate refrigerant charge (bubbles or misty
sight glass indicates low charge). If charge is low, have system checked for leaks and
recharged by a refrigeration serviceman.
B. Hot-gas bypass valve stuck open. Have repaired or replace if defective by a
refrigeration serviceman.
C. Expansion valve plugged or inoperative. Check thermal bulb and capillary tube for
damage. Have repaired or replaced if defective by a refrigeration serviceman.
D. Plugged lter.Checklterinchilledwatercircuitandclean.
E. Air in system. Purge air.
4.8 SENSOR
A. The sensor is a solid state temperature transducer which converts
temperature input to proportional current output.
B. To quickly test for a defective probe, switch connections between the
defective probe and a probe known to be working properly. A defective
sensor will display a “---” in the display window on the instrument control.
Please note that “---” will also display when process temperatures are
above 100°F.
4.9 COOLANT PUMP
A. Thecentrifugalpumpisdesignedtooperateataspecicowandpressureatthe
maximumrunloadampdrawofthemotor.Toomuchowcanoverloadthemotorand
cause the overload circuit to open and stop the pump.
B. If the overload trips, check for electrical shorts, loose wires, or blown fuses. If these check
OK, reset the overload circuit and restart the chiller.
4.10 CHILLER CONTROLLER
A. The control instrument is used for all normal set ups, diagnostics, temperature readout
and operational information. It contains the software and electronic components which
operate the control instrument.
B. Thecontrolinstrumentisnoteldrepairable.Itcanbeeasilyremovedandreplacedor
repaired if a problem occurs.
Typical chilled
water sensor
probe with 2
pole connector.