Service manual

6-14
Service Section 6
Q270 Cycle Times/24-Hour Ice Production Chart
SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending
on operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp. Freeze Time Harvest
Entering
Condenser
Water Temperature °
°°
°F/°
°°
°C
Time
°
°°
°F/°
°°
°C
50/10.0 70/21.1 90/32.2
70/21.1 11.0-12.6 12.8-14.7 14.5-16.5
80/26.7 11.3-12.9 13.1-15.0 14.8-16.9 1.0-2.5
90/32.2 12.6-14.3 14.8-16.9 17.0-19.3
100/37.8 14.1-16.1 17.0-19.3 19.8-22.5
1
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Water Temperature °
°°
°F/°
°°
°C
Condenser
°
°°
°F/°
°°
°C
50/10.0 70/21.1 90/32.2
70/21.1 280 245 220
80/26.7 275 240 215
90/32.2 250 215 190
100/37.8 225 190 165
1
Based on average ice slab weight of 2.44 lb. to 2.75 lb.
2
Regular cube derate is 7%
Operating Pressures
Air Temp. Freeze Cycle Harvest Cycle
Entering
Condenser
°
°°
°F/°
°°
°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 200-255 60-22 165-200 70-95
70/21.1 200-255 60-22 170-205 70-100
80/26.7 200-295 61-23 175-210 75-100
90/32.2 240-330 65-26 205-240 80-100
100/37.8 265-375 66-30 220-260 85-115
1
Suction pressure drops gradually throughout the freeze cycle
SELF-CONTAINED WATER-COOLED
NOTE: These characteristics may vary depending
on operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Air Temp. Freeze Time Harvest
Around Ice
Machine
Water Temperature °
°°
°F/°
°°
°C
Time
°
°°
°F/°
°°
°C
50/10.0 70/21.1 90/32.2
70/21.1 10.6-12.2 12.3-14.0 13.5-15.4
80/26.7 10.8-12.4 12.6-14.3 13.8-15.7 1-2.5
90/32.2 11.0-12.6 12.8-14.7 14.1-16.1
100/37.8 11.3-12.9 13.1-15.0 14.5-16.5
1
Times in minutes
24 Hour Ice Production
Air Temp.
Around Ice
Water Temperature °
°°
°F/°
°°
°C
Machine
°
°°
°F/°
°°
°C
50/10.0 70/21.1 90/32.2
70/21.1 290 255 235
80/26.7 285 250 230
90/32.2 280 245 225
100/37.8 275 240 220
1
Based on average ice slab weight of 2.44 lb. to 2.75 lb.
2
Regular cube derate is 7%
Condenser 90/32.2 Air Temperature Around Ice Machine
Water
Water Temperature °
°°
°F/°
°°
°C
Consumption 50/10.0 70/21.1 90/32.2
Gal/24 hours 240 410 2740
1
Water regulating valve set to maintain 240 PSIG discharge
pressure
Operating Pressures
Air Temp. Freeze Cycle Harvest Cycle
Around Ice
Machine
°
°°
°F/°
°°
°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10.0 235-245 24-52 175-210 80-95
70/21.1 235-245 24-54 175-210 80-95
80/26.7 235-250 24-56 175-210 80-95
90/32.2 235-255 24-58 175-210 80-95
100/37.8 235-260 24-60 175-210 80-95
1
Suction pressure drops gradually throughout the freeze cycle