Temptek BG-N4 Series, Instruction Manual

Page: 44 / 76

BG-N4 Glycol Chiller
Page: 44
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
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. Capacity control device held in unloaded state. Check digital unloading or hot gas
bypass solenoid valve for proper operation.
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 filter. Check filter 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 specific flow and
pressure at the maximum run load amp draw of the motor. Too much flow
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 field repairable. It can be easily removed and
replaced or repaired if a problem occurs.
C. All control instruments used in these water chillers are covered by the machine’s
warranty. Proprietary “tailor made” instrument are manufactured specifically by
our affiliated company Advantage Electronics.
Typical chilled
water sensor
probe with 2
pole connector.