Temptek CF Series - Internal Compressor Overload; Low Process Pressure or Water Flow

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
Page: 40
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
B. Air-cooled units:
Head pressure too low. Check that entering air temperature is above 60°F. If below
60°F,ndoutreasonwhy.
C. Water-cooled units:
Head pressure too low. Adjust condenser water regulating valve to maintain 100°F -
105°F refrigerant condensing temperature*. Have a refrigeration serviceman repair the
valve or replace if defective.
 Thewaterregulatorvalveisnormallyfactorysetforproperoperation.Wheneld
adjustments are required, turn the adjusting nut on the top of the valve counter clockwise
to raise the refrigerant pressure and clockwise to lower the pressure. Adjustments should
be made only when the chiller is running at full load.
D. 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.
E. Improperly set low pressure switch. Have a refrigeration serviceman reset control or
replace if defective.
F. Restriction in the liquid line.
1. Clogged lter drier. Check for pressure or temperature drop and have drier core
replaced by a refrigeration serviceman.
2. Liquid line valve or suction valve on compressor is partially closed. Open
fully.
3. Liquid line solenoid not opening fully or leaking during off cycle. Have the
solenoid repaired or replaced if defective by a refrigeration serviceman.
4. Expansion valve plugged or inoperative. Check thermal bulb and capillary
tube for damage. Have repaired or replaced if defective by a refrigeration service
man.
4.5 COMPRESSOR SHUTS OFF ON INTERNAL OVERLOAD
A. Control does not reset. Have compressor windings and internal solid state safety
control checked by a refrigeration serviceman. Have it repaired or replace if defective.
4.6 LOW OR NO PROCESS PRESSURE OR WATER FLOW
A. Valves. Check if water valves are open.
B. Pump. Check pump for correct rotation. Check pump suction for restriction. Replace
motor if defective.
* See Temperature-Pressure
chart in Section 8.2 for
refrigerant pressure.