Manitowoc UG065A Technician's Handbook

50
Procedure
Step
Example Using UG040A Model Ice
Machine
1. Determine the ice
machine operating
conditions.
Air temp. entering condenser:
32°C
Water temp. entering water fill valve:
21°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.
39.28 minutes
Published Freeze cycle time:
2.92 to2.2 bar
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 (bar)
In the example, the proper suction pressure
should be approximately 2.92 bar at 1 minute;
2.56bar at 20 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:
Beginning of Freeze cycle:5bar (at 1 min.)
Middle of Freeze cycle:4 bar (at 20 min.)
End of Freeze cycle:3 bar (at 40 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 2.92 bar
(at 1 minute) – not 5 bar
Approximately 2.56 bar
(at 20 minutes) – not 4 bar
Approximately 2.2 bar
(at 40 minutes) – not 3 bar
20
2.56
140
2.92
2.2

Manitowoc UG065A Specifications

General

Brand	Manitowoc
Model	UG065A
Category	Ice Maker
Language	English