Manitowoc QYDUALC User Manual

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Procedure
Step
Example Using
Q1000C Model Ice Machine
1. Determine the ice
machine operating
conditions.
Air temp. entering condenser:
90°F/32.2°C
Air temp. around ice machine:
80°F/26.7°C
Water temp. entering water fill valve:
70°F/21.1°C
2A. Refer to “Cycle Time” and
“Operating Pressure”
charts for ice machine
model being checked.
Using operating
conditions from step 1,
determine published
Freeze cycle time and
published Freeze cycle
suction pressure.
11.5-12.3 minutes
Published Freeze cycle time:
52-25 psig
Published Freeze cycle suction pressure:
2B. Compare the published
Freeze cycle time and
published Freeze cycle
suction pressure. Develop
a chart.
Published Freeze Cycle Time
(minutes)
Published Freeze Cycle Suction
Pressure (psig)
In the example, the proper suction pressure
should be approximately 38 psig at 6 minutes;
34 psig at 8 minutes; etc.
3. Perform an actual suction
pressure check at the
beginning, middle and end
of the Freeze cycle. Note
the times at which the
readings are taken.
Manifold gauges were connected to the
example ice machine and suction pressure
readings taken as follows:
psig
Beginning of Freeze cycle: 59 (at 1 min.)
Middle of Freeze cycle: 48 (at 6 min.)
End of Freeze cycle: 40 (at 12 min.)
4. Compare the actual
Freeze cycle suction
pressure (step 3) to the
published Freeze cycle
time and pressure
comparison (step 2B).
Determine if the suction
pressure is high, low or
acceptable.
In this example, the suction pressure is
considered high throughout the Freeze
cycle. It should have been:
Approximately 52 psig
(at 1 minute) – not 59
Approximately 38 psig
(at 6 minutes) – not 48
Approximately 25 psig
(at 12 minutes) – not 40
124681012
52 47 43 38 34 29 25

Manitowoc QYDUALC Specifications

General

Brand	Manitowoc
Model	QYDUALC
Category	Ice Maker
Language	English