ICE MACHINES Q-Model Service Manual

Section 7Refrigeration SystemQ420/450 SERIESSelf-Contained Air-CooledNOTE: These characteristics may vary depending onoperating conditions.Cycle TimesFreeze Time + Harvest Time = Total Cycle TimeQ420/450 SERIESSelf-Contained Water-CooledNOTE: These characteristics may vary depending onoperating conditions.Cycle TimesFreeze Time + Harvest Time = Total Cycle TimeAir Temp.EnteringCondenser°F/°CFreeze TimeWater Temperature °F/°C50/10.0 70/21.1 90/32.2HarvestTimeAir Temp.Around IceMachine°F/°CFreeze TimeWater Temperature °F/°C50/10.0 70/21.1 90/32.2HarvestTime70/21.1 9.7-11.4 10.9-12.8 12.0-14.070/21.1 9.9-11.7 11.4-13.4 12.6-14.880/26.7 10.9-12.8 12.3-14.4 13.3-15.690/32.2 12.3-14.4 14.1-16.5 15.5-18.0100/37.8 14.5-17.0 16.5-19.2 18.3-21.31-2.580/26.7 10.1-11.9 11.7-13.7 13.0-15.290/32.2 10.4-12.2 12.0-14.0 13.3-15.6100/37.8 10.6-12.5 12.3-14.4 13.7-16.01-2.5Times in minutesTimes in minutes24 Hour Ice Production24 Hour Ice ProductionAir Temp.Water Temperature °F/°CEnteringCondenser 50/10.0 70/21.1 90/32.2°F/°C70/21.1 530 480 44080/26.7 480 430 40090/32.2 430 380 350100/37.8 370 330 300Based on average ice slab weight of 4.12 - 4.75lbRegular cube derate is 7%Air Temp.Water Temperature °F/°CAround IceMachine 50/10.0 70/21.1 90/32.2°F/°C70/21.1 520 460 42080/26.7 510 450 41090/32.2 500 440 400100/37.8 490 430 390Based on average ice slab weight of 4.12 - 4.75 lb.Regular cube derate is 7%Operating PressuresAir Temp.EnteringCondenser°F/°CFreeze CycleDischargePressurePSIGSuctionPressurePSIGHarvest CycleDischargePressurePSIGSuctionPressurePSIG50/10.0 195-260 45-30 150-170 75-9070/21.1 200-260 47-33 165-180 80-10080/26.7 230-265 50-35 165-185 80-10090/32.2 260-290 55-36 190-210 90-110100/37.8 290-340 60-38 215-235 105-125110/43.3 195-260 45-30 235-255 125-140Suction pressure drops gradually throughout the freeze cycleCondenserWaterConsumptionOperating Pressures90/32.2 Air TemperatureAround Ice MachineWater Temperature °F/°C50/10.0 70/21.1 90/32.2Gal/24 hours 400 740 2400Water regulating valve set to maintain 230 PSIG discharge pressureAir Temp.Around IceMachine°F/°CFreeze CycleDischargePressurePSIGSuctionPressurePSIGHarvest CycleDischargePressurePSIGSuctionPressurePSIG50/10.0 235-245 50-35 165-180 85-10070/21.1 235-245 50-35 165-180 85-10080/26.7 235-245 50-35 165-180 85-10090/32.2 235-245 52-35 165-180 85-100100/37.8 235-245 52-35 165-185 85-100110/43.3 240-250 55-36 165-185 85-100Suction pressure drops gradually throughout the freeze cyclePart No. 80-1100-3 7-37