Service manual

Section 7 Refrigeration System
Part No. 80-1206-3 7-35
QDUALC/CVD1875 SERIES REMOTE AIR 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
QDUALC/CVD2075 SERIES REMOTE AIR 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.
Entering
Condenser
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
-20 to 70/
-29 to 21.1
10.8-11.6 11.9-12.7 12.8-13.7
.75-2.5
90/32.2 12.0-12.9 13.1-14.0 14.2-15.22
100/37.8 13.1-14.0 14.3-15.4 15.7-16.8
110/43.3 14.9-16.0 16.2-17.4 17.4-18.6
Times in minutes
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
-20 to 70/
-29 to 21.1
1820 1670 1560
90/32.2 1650 1530 1420
100/37.8 1530 1410 1300
110/43.3 1360 1260 1180
Based on average ice slab weight of 15.50-16.50 lb
Regular cube derate is 7%
Air Temp.
Entering
Condenser
°F/°C
Freeze Cycle Harvest Cycle
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
-20 to50/
-29 to10.0
260-215 42-22 140-185 65-85
70/21.1 275-220 42-24 150-190 70-90
80/26.7 285-250 43-25 155-195 70-95
90/32.2 310-265 44-26 160-195 70-100
100/37.8 370-300 46-28 170-200 85-115
110/43.3 395-335 50-30 180-210 90-120
Suction pressure drops gradually throughout the freeze cycle
It is normal for the head pressure control valve to fluctuate up and
down (refer to headmaster diagnostics). Depending on ambient
temperature, low event during hunting may be below published
discharge pressures.
Air Temp.
Entering
Condenser
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
-20 to 70/
-29 to 21.1
9.7-10.4 10.9-11.7 11.6-12.5
.75-2.5
90/32.2
10.1-10.8 11.3-12.1 12.0-12.9
100/37.8
10.8-11.6 12.0-12.9 12.9-13.8
110/43.3
12.0-12.9 12.5-13.4 13.9-14.9
Times in minutes
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10.0 70/21.1 90/32.2
-20 to 70/
-29 to 21.1
2000 1800 1700
90/32.2
1930 1750 1650
100/37.8
1810 1650 1550
110/43.3
1650 1590 1450
Based on average ice slab weight of 15.50-16.50 lb
Regular cube derate is 7%
Air Temp.
Entering
Condenser
°F/°C
Freeze Cycle Harvest Cycle
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
-20 to50/
-29 to10.0
260-215 38-15 130-175 50-70
70/21.1 270-220 42-16 140-185 65-85
80/26.7 280-250 45-17 160-205 65-85
90/32.2 290-255 48-17 180-210 70-85
100/37.8 320-265 52-18 180-215 75-90
110/43.3 360-300 55-19 185-220 85-100
Suction pressure drops gradually throughout the freeze cycle
It is normal for the HPC valve to fluctuate up and down (refer to
headmaster diagnostics). Depending on ambient temperature, low
event during hunting may be below published discharge pressures.
Important
CVD2075 Condensing Units
A scroll compressor must be operated for a
minimum break period of 72 hours before full ice
production capacity will be reached.