ICE MACHINES Q-Model Service Manual

Refrigeration System Section 7EVAPORATORHEATEXCHANGEREXPANSION VALVECOMPRESSORSTRAINERHARVEST SOLENOID VALVECHECK VALVEREMOTECONDENSERLIQUIDLINESOLENOIDVALVEDRIERRECEIVERSERVICEVALVEHARVEST PRESSUREREGULATING VALVEH.P.R. SOLENOIDVALVEHEADPRESSURECONTROLVALVERBCHECK VALVECRECEIVERHIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPORSV1567Figure 7-4. Remote Harvest Cycle (Models Q450/Q600/Q800/Q1000)Harvest Cycle Refrigeration SequenceHot gas flows through the energized harvest valve,heating the evaporator. The harvest valve is sized toallow the proper amount of hot gas into the evaporator.This specific harvest valve sizing, along with the harvestpressure regulating (H.P.R.) system, assures properheat transfer, without the hot gas condensing to liquidand slugging the compressor.The harvest pressure regulating (H.P.R.) valve helpsmaintain the suction pressure during the harvest cycle.(See “H.P.R. System” on Page 7-27.)7-4 Part No. 80-1100-3