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Titan Central Chillers
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 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 (process, evaporator and standby)
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
OIL PRESSURE (not on all models)
A.
This switch must be manually reset after the problem is resolved.
B.
Check for low oil level in the compressor crankcase or insufficient compressor warm up
before start-up.
C.
Defective crankcase heater, internal compressor damage causing the compressor to
pump too much oil through the system, defective oil pump, or plugged pick up screen
in compressor oil sump. Note: Only semi-hermetic compressors 15-30 tons have an oil
pressure safety switch.
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: service@AdvantageEngineering.com
Typical chilled
water sensor
probe with 2
pole connector.
Page: 55
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