Manitowoc Marine Q 1000, Service Technician'S Handbook

Page: 120 / 179

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HPR DIAGNOSTICS
Steps 1 through 4 can be quickly verified without
attaching a manifold gauge set or thermometer.
All questions must have a yes answer to continue
the diagnostic procedure.
1. Liquid line warm?
(Body temperature is normal)
If liquid line is warmer or cooler than body
temperature, refer to headmaster diagnostics.
2. Ice fill pattern normal?
Refer to “Ice Formation Pattern” if ice fill is not
normal.
3. Freeze time normal?
(Refer to Cycle Times/Refrigerant Pressures/24
Hour Ice Production Charts)
Shorter freeze cycles - Refer to headmaster
diagnostics.
Longer freeze cycles - Refer to water system
checklist, then refer to Refrigeration Diagnostic
Procedures.
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)
Connect refrigeration manifold gauge set to the
access valves on the front of the ice machine, and
a thermometer thermocouple on the discharge line
within 6" of the compressor (insulate
thermocouple).
Establish baseline by recording suction and
discharge pressure, discharge line temperature
and freeze & harvest cycle times. (Refer to
“ Refrigeration System Operational Analysis
Tables ” for data collection detail).