Manitowoc-ice MARINE MODEL S1800 Manuel d'utilisateur télécharger pdf (Page 86)

100

Refrigeration System Section 7

7-20

Part Number 80-1634-3

Cycle Time/24 Hour Ice Production/

Refrigerant Pressure Charts

These charts are used as guidelines to verify correct ice

machine operation.

Accurate collection of data is essential to obtain the

correct diagnosis.

• Refer to “OPERATIONAL ANALYSIS TABLE” for the

list of data that must be collected for refrigeration

diagnostics. This list includes: before beginning

service, ice production check, installation/visual

inspection, water system checklist, ice formation

pattern, safety limits, comparing evaporator inlet/

outlet temperatures, discharge and suction pressure

analysis.

• Ice production checks that are within 10% of the

chart are considered normal. This is due to variances

in water and air temperature. Actual temperatures

will seldom match the chart exactly.

• Zero out manifold gauge set before obtaining

pressure readings to avoid misdiagnosis.

• Discharge and suction pressure are highest at the

beginning of the cycle. Suction pressure will drop

throughout the cycle. Verify the pressures are within

the range indicated.

• Record beginning of freeze cycle suction pressure

one minute after water pump energizes.

• Regular cube production derate is 7%

• 50Hz production derate is 7%

• 50Hz regular cube total production derate is 14%

S1800 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time

Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 8.5-9.4 9.2-10.1 10.7-11.8

.75-2.00

80/26.7 8.5-9.4 9.3-10.3 10.9-12.0

90/32.2 8.6-9.4 9.4-10.4 11.1-12.2

100/37.8 8.7-9.6 9.6-10.5 11.2-12.3

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1870 1750 1530

80/26.7 1870 1730 1510

90/32.2 1860 1710 1490

100/37.8 1830 1690 1470

Based on average ice slab weight of 13- 14.125 lb

Condenser

Water

Consumption

Air Temperature / Water Temperature °F

77/59 90/70 110/90

Gal / per

100 lbs of ice

95 155 510

Water regulating valve set to maintain 240 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0

225-235 40-24 140-160 60-80

70/21.1 225-275 45-26 155-175 60-85

80/26.7 230-295 45-28 160-180 70-90

90/32.2 255-320 46-29 170-195 80-100

100/37.8 290-360 48-30 190-215 95-115

110/43.3 325-400 49-30 225-250 110-130

Suction pressure drops gradually throughout the freeze cycle

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 99 100

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Manitowoc-ice MARINE MODEL S1800 Manuel d'utilisateur Page 86

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