Manitowoc J250 Service Manual

Also see for J-1300: Use and care manual Installation instructions

Contents

Manitowoc J250 Service Manual Manual pdf 108 page image

Section 7 Refrigeration System7-3REMOTE MODELSRemote Pre-Chill and Freeze Cycle (Models J450/J600/J800/J1000)Prechill Refrigeration SequenceNo water flows over the evaporator during theprechill. The refrigerant absorbs heat (picked upduring the harvest cycle) from the evaporators. Thesuction pressure decreases during the prechill.Freeze Cycle Refrigeration SequenceThe refrigerant absorbs heat from the water runningover the evaporator surface. The suction pressuregradually drops as ice forms.The headmaster control valve maintains dischargepressure in cold ambient temperatures. (See“Headmaster Control Valve” on page 7-28.)SV1566EVAPORATORHEATEXCHANGEREXPANSIONVALVEHOT GASSOLENOID VALVESTRAINERREMOTECONDENSERRECEIVERSERVICE VALVECOMPRESSORDRIERHIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE VAPORLOW PRESSURE LIQUIDLIQUID LINESOLENOIDVALVERECEIVERCHECK VALVECHECK VALVEHARVESTPRESSUREREGULATINGVALVE HARVESTPRESSUREREGULATINGSOLENOID VALVEHEADPRESSURECONTROLVALVECBR