ICE MACHINES Q-Model Service Manual

Refrigeration System Section 7Q280 SERIESSelf-Contained Air-CooledNOTE: These characteristics may vary depending onoperating conditions.Cycle TimesFreeze Time + Harvest Time = Total Cycle TimeQ280 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 10.6-12.5 11.8-13.8 12.6-14.770/21.1 10.6-12.5 12.0-14.1 12.3-14.480/26.7 11.5-13.5 12.8-15.0 13.8-16.190/32.2 12.6-14.7 14.1-16.5 15.2-17.8100/37.8 14.5-16.9 16.5-19.3 18.0-21.01.0-2.580/26.7 10.8-12.7 12.3-14.4 13.8-16.190/32.2 11.0-13.0 12.6-14.7 14.1-16.5100/37.8 11.3-13.2 12.8-15.0 14.5-16.91-2.5Times 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/°C70/21.1 290 265 25080/26.7 270 245 23090/32.2 250 225 210100/37.8 220 195 180Based on average ice slab weight of 2.44 - 2.81 lbRegular cube derate is 7%Operating PressuresAir Temp.EnteringCondenser°F/°CFreeze CycleDischargePressurePSIGSuctionPressurePSIGHarvest CycleDischargePressurePSIGSuctionPressurePSIG50/10.0 195-250 60-20 150-190 70-9070/21.1 195-250 60-20 150-190 70-9080/26.7 220-280 60-26 180-220 70-9090/32.2 250-310 66-30 190-220 80-100100/37.8 280-350 70-32 220-250 80-110110/43.3 310-390 85-40 250-270 80-120Suction pressure drops gradually throughout the freeze cycleAir Temp.Water Temperature °F/°CAround IceMachine 50/10.0 70/21.1 90/32.2°F/°C70/21.1 290 260 25580/26.7 285 255 23090/32.2 280 250 225100/37.8 275 245 220Based on average ice slab weight of 2.44 - 2.81 lbRegular cube derate is 7%CondenserWaterConsumptionOperating Pressures90/32.2 Air TemperatureAround Ice MachineWater Temperature °F/°C50/10.0 70/21.1 90/32.2Gal/24 hours 250 490 3400Water regulating valve set to maintain 230 PSIG discharge pressureAir Temp.AroundIceMachine°F/°CFreeze CycleDischargePressurePSIGSuctionPressurePSIGHarvest CycleDischargePressurePSIGSuctionPressurePSIG50/10.0 225-235 60-28 190-200 75-9070/21.1 225-235 60-28 190-200 80-9080/26.7 225-240 60-28 190-200 80-9090/32.2 225-245 62-28 190-200 80-90100/37.8 225-250 62-30 190-200 80-90110/43.3 225-260 64-32 195-205 80-95Suction pressure drops gradually throughout the freeze cycle7-34 Part No. 80-1100-3