Glycol Chillers : BC Series with MG Control Instrument
Page: 48
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: [email protected]
The water regulator valve is normally factory set for proper operation. When field
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 limit setting. Reset control to proper value. Have a
refrigeration serviceman reset control or replace if defective.
F.
Restriction in the liquid line.
1.
Clogged filter 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 bulb and/or tube 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.
C.
Filters. Check filter in the chilled water circuit and clean if necessary.
D.
Pressure switch (or flow 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.
