ICE MACHINES Q-Model Service Manual

Refrigeration System Section 73. Extremely Thin at Evaporator InletThere is no ice, or a considerable lack of ice formationon the intlet of the evaporator (tubing inlet). Examples:The ice at the outlet of the evaporator reaches 1/8" toinitiate a harvest, but there is no ice formation at all onthe intlet of the evaporator.OUTLET5. No Ice FormationThe ice machine operates for an extended period, butthere is no ice formation at all on the evaporator.ImportantThe Q1300 Q1600 and Q1800 model machineshave left and right expansion valves and separateevaporator circuits. These circuits operateindependently from each other. Therefore, one mayoperate properly while the other is malfunctioning.Example: If the left expansion valve is starving, itmay not affect the ice formation pattern on the entireright side of the evaporator.ICEOUTLETOUTLETINLETINLETINLETSV1575SV1571Figure 7-9. Extremely Thin Ice Formation atEvaporator InletFigure 7-11. Q1300/Q1600/Q1800 Evaporator Tubing4. Spotty Ice FormationThere are small sections on the evaporator where thereis no ice formation. This could be a single corner, or asingle spot in the middle of the evaporator. This isgenerally caused by loss of heat transfer from the tubingon the back side of the evaporator.OUTLETICEINLETSV1577Figure 7-10. Spotty Ice Formation7-12 Part No. 80-1100-3