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MK Series Portable Chiller : Air-Cooled : HE INSTRUMENT
when the unit is operating at 100% cooling capacity. Constant
foam or bubbles indicate a loss of freon.
G.
Check to see if the condensing media is too cold. On air condensed
units, the ambient air at the condenser intake must be at least 60°F.
If this is not possible, a damper control assembly package may be
required.
4.9
WATER LEVEL
A.
The automatic make up solenoid valve will open and fill the
reservoir. If the solenoid is activated but the reservoir is not filling
check the solenoid for proper operation.
B.
If the automatic makeup is not being used, manually fill the unit.
Use the indicator light to determine when the reservoir is properly
filled.
4.10
FREEZESTAT
A.
The freezestat sensor bulb is located at the evaporator water outlet
port. If the water out temperature of the evaporator reaches the
freezestat setting the switch will open and stop the refrigeration
compressor.
B.
Check for restricted water flow and add a bypass line if necessary.
C.
The setpoint is adjusted too low for the safety switch settings.
D.
The freezestat is adjusted incorrectly or is defective.
4.11
OIL PRESSURE
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.
4.12
CRANKCASE HEATER
A.
If the crankcase heater is not drawing current during the
compressor off cycle, check for a defective crankcase heater,
defective fuses or defective interlock on the compressor starter.
B.
Scroll compressors do not have a crankcase heater.
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
Page: 42
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