Koolaire STH045 8/15 Technician's Handbook page 102

4. Harvest time is longer than normal and control
board indicates safety limit #2?
(Refer to Cycle Times/Refrigerant Pressures/24
Hour Ice Production Charts).
5. Discharge line temperature is greater than 160°F
at the end of the freeze cycle? (Refer Discharge
Line Temperature Analysis)
6. Connect refrigeration manifold gauge set to the
access valves on the front of the ice machine.
Establish baseline by recording suction and
discharge pressure and freeze & harvest cycle
times. (Refer to "Freeze Cycle Refrigeration
System Operational Analysis Tables" for data
collection detail).
7. Freeze cycle Head Pressure is in the range
indicated in the cycle time/24 hour ice production
and operational pressure chart?
If the head pressure is low refer to head pressure
control valve diagnostics.
8. Freeze cycle Suction Pressure normal? 
Refer to analyzing suction pressure if suction
pressure is high or low.
9. Harvest cycle suction and discharge pressures
are lower than indicated in the cycle times/
refrigerant pressures/24 hour ice production
chart?
10. Replace Harvest Pressure Regulating solenoid.
102 Part Number STH045 8/15