ICE MACHINES Q-Model Service Manual

Section 7Refrigeration SystemFreeze Cycle Suction Pressure High ChecklistPossible CauseCheck/CorrectImproper installation See “Installation/Visual Inspection Checklist” on Page 7-10Discharge pressureDischarge pressure is too high, and is affecting low side(See “Freeze Cycle Discharge Pressure High Checklist” on Page 7-16)Improper refrigerant chargeOverchargedWrong type of refrigerantOtherNon-Manitowoc components in systemH.P.R. solenoid leakingharvest valve stuck openTXV flooding (check bulb mounting)Defective compressorFreeze Cycle Suction Pressure Low ChecklistPossible CauseCheck/CorrectImproper installation See “Installation/Visual Inspection Checklist” on Page 7-10Discharge pressureDischarge pressure is too low, and is affecting low side(See “Freeze Cycle Discharge Pressure Low Checklist” on Page 7-16)Improper refrigerant chargeUnderchargedWrong type of refrigerantOtherNon-Manitowoc components in systemImproper water supply over evaporator (See “Water System Checklist” on page 7-10)Loss of heat transfer from tubing on back side of evaporatorRestricted/plugged liquid line drierRestricted/plugged tubing in suction side of refrigeration systemTXV starvingNOTE: Do not limit your diagnosis to only the itemslisted in the checklists.Part No. 80-1100-3 7-19