Manitowoc Ice STH003 manual Procedure, Step

Page 50

PROCEDURE

Step

 

 

 

 

 

 

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Determine the ice

 

Air temp. entering condenser:

 

 

 

machine operating

 

 

 

°

 

 

°

 

 

 

 

 

conditions.

 

 

 

 

 

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”

 

19.1 - 21.7 minutes

 

 

 

 

 

 

charts for ice machine

 

 

 

 

 

 

 

 

 

 

 

 

Published freeze cycle time:

 

 

 

model being checked.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Using operating conditions

 

20-3 PSIG

 

 

 

 

 

 

 

 

 

 

from Step 1, determine

 

 

 

 

 

 

 

 

 

 

 

Published freeze cycle

 

 

 

 

 

 

published freeze cycle time

 

 

 

 

 

 

 

 

suction pressure:

 

 

 

 

 

 

 

 

 

and published freeze cycle

 

 

 

 

 

 

 

 

 

 

suction pressure.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Published Freeze Cycle Time

 

 

 

 

 

 

(minutes)

 

 

 

2B. Compare the published

 

1

5

 

10

 

15

20

 

freeze cycle time and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

published freeze cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

suction pressure. Develop a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

chart.

 

20

16

 

12

 

8

3

 

 

 

 

Published Freeze Cycle Suction

 

 

 

 

 

Pressure (psig)

 

 

 

 

 

In the example, the proper suction

 

 

 

 

 

Pressure should be approximately 16

 

 

PSIG at 5 minutes; 12 PSIG at 10

 

 

 

 

 

Minutes; etc.

 

 

 

 

 

 

 

 

 

3. Perform an actual suction

 

Manifold gauges were connected to the

pressure check at the

 

example ice machine and suction pressure

beginning, middle and end

 

readings taken as follows:

 

PSIG

of the freeze cycle. Note the

 

Beginning of Freeze cycle:

 

 

 

times at which the readings

 

 

 

30 (at

1 min.)

 

 

 

are taken.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Middle of freeze cycle:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22 (at

10 min.)

 

 

 

 

 

End of freeze cycle:

 

 

 

 

 

 

 

 

 

 

8 (at 20 min.)

 

 

 

4. Compare the actual

 

In this example, the suction pressure is

freeze cycle suction

 

considered high throughout the freeze

pressure (Step 3) to the

 

cycle. It should have been:

 

 

 

published freeze cycle time

 

Approximately 20 PSIG

 

 

 

 

 

 

and pressure comparison

 

(at 1 minute) – not 30

 

 

 

 

 

 

(Step 2B). Determine if the

 

Approximately 12 PSIG

 

 

 

 

 

 

suction pressure is high,

 

 

 

 

 

 

 

 

(at 10 minutes) – not 22

 

 

 

 

 

 

low or acceptable.

 

 

 

 

 

 

 

 

Approximately – 3 PSIG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(at 20 minutes) – not 8

 

 

 

 

 

 

50

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Contents CM050 CM Model Ice Machines Safety Notices Procedural Notices Potential Personal Injury Situation Read These Before ProceedingPersonal Injury Potential Table of Contents Liquid Line Thermistor CMS050A004 Model NumbersDrain Pump Accessories LegsManitowoc ICE Machine Cleaner and Sanitizer MODEL/SERIAL Number Location Owner Warranty Registration Card GeneralPage Manitowoc ICE, INC Installation Location of ICE MachineICE Machine Heat of Rejection Heat of Rejection Air Conditioning** PeakLeveling the ICE Machine Levelers LegsDrain Connections Water SERVICE/DRAINS Water SupplyWater Inlet Lines Drain Pump Water Supply and Drain Line SIZING/CONNECTIONSMinimum Circuit Ampacity Electrical SpecificationsElectrical Requirements Voltage Gfci RequirementsComponent Identification Water Pump Evaporator Shutter Assembly Clean Green BIN Thermostat AdjustmentPower Button Green Operational ChecksSafety Timers Cleaning the Condenser ICE Machine InspectionAIR-COOLED Condenser Interior Cleaning and Sanitizing Interior Cleaning and Sanitizing General Place CLEANING/SANITIZING ProcedurePage Cleaning Procedure Page Page Removal of Parts for Cleaning and Sanitizing TOP Cover Water Shutters ICE Chute Sump Drain Overflow Tube Water Trough Spray BAR, Water Pump and Hose Spray BAR Disassembly Removal from SERVICE/LONG Term STORAGE/WINTERIZATION General SELF-CONTAINED AIR-COOLED ICE MachinesHarvest Refrigeration System Start-UpFreeze Automatic Shut-OffEnergized Parts Chart SELF-CONTAINED ICE Machines SequenceTroubleshooting Diagnosing AN ICE Machine That will not RUNPage ICE Machine will not Harvest ICE Quality is Poor Cubes are SHALLOW, Incomplete or White Freeze Cycle is LONG, LOW ICE Production ICE Machine Runs & no ICE is Produced Freeze Harvest Cycle Psig Beginning Freeze Cycle Discharge Pressure LOW Checklist Analyzing Suction Pressure Procedure StepDischarge Pressure Suction Pressure High Checklist ProblemSuction Pressure LOW Checklist Problem Normal Operation HOT GAS ValveGeneral HOT GAS Valve Analysis Freeze cycle. If Specifications FunctionCheck Procedure No Ice on Ice on Bulb ResultFreeze Time Harvest Time Total Cycle Time Adjusting Finishing Time Additional finishing time checkLiquid Line Thermistor TEMPERATURE/RESISTANCE Chart SM50 Resistance ChartTotal System Refrigeration Charge Component Specifications Check Procedures Check Resistance OHM Values Compressor Electrical DiagnosticsSingle Phase Compressors Check Motor Windings to GroundCompressor Drawing Locked Rotor Compressor Drawing High AmpsCapacitor RelayPage Cycle Times Freeze Time + Harvest Time = Cycle Time Recycle RecoverNew Product Specifications ReclaimRefrigerant RE-USE Policy Page Refrigerant Recovery/Evacuation/Charging ConnectionsRecovery/Evacuation Charging Procedures Page System Contamination Cleanup General No symptoms or suspicion Normal Mild System Contamination Cleanup Procedure Severe System Contamination Cleanup Procedure Change the vacuum pump oilFollow normal evacuation procedures Page Using Pinch Off Tool FIG. a Pinching OFF TubingBrazing Procedures for Danfoss Solenoid Valves Do not disassemble valveMAX F 700C Liquid Line Filter Drier Control Board Wiring Diagrams Tubing Schematic Manitowoc Ice, Inc