Manitowoc J250 - Section 7 - Refrigeration System; Refrigeration Sequence of Operation; Refrigeration System Diagnostics and Analysis

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Table of Contents (cont.)

Section 7 - Refrigeration System

Sequence of Operation

Self-Contained Air- or Water-Cooled Models...............................................................................................7-1

Remote Models ..............................................................................................................................................7-3

J1300/J1800 Refrigeration Tubing Schematics..............................................................................................7-6

Operational Analysis (Diagnostics)

General ...........................................................................................................................................................7-8

Before Beginning Service...............................................................................................................................7-9

Ice Production Check .....................................................................................................................................7-9

Installation/Visual Inspection Checklist.......................................................................................................7-10

Water System Checklist ...............................................................................................................................7-10

Ice Formation Pattern...................................................................................................................................7-11

Safety Limits ................................................................................................................................................7-13

Hot Gas Valve Temperature Check..............................................................................................................7-17

Single Expansion Valve Ice Machines - Comparing Evaporator Inlet and Outlet Temperatures................7-18

Analyzing Discharge Pressure During Freeze or Harvest Cycle

Procedure................................................................................................................................................7-19

Freeze Cycle Discharge Pressure High Checklist ..................................................................................7-19

Freeze Cycle Discharge Pressure Low Checklist...................................................................................7-19

Analyzing Suction Pressure During Freeze Cycle

Procedure................................................................................................................................................7-20

Freeze Cycle Suction Pressure High Checklist......................................................................................7-21

Freeze Cycle Suction Pressure Low Checklist.......................................................................................7-21

How to Use the Refrigeration System Operational Analysis Tables............................................................7-22

Refrigeration System Operational Analysis Tables

Single TXV ............................................................................................................................................7-24

Dual TXV...............................................................................................................................................7-25

Remotes Only

Harvest Pressure Regulating (H.P.R.) System .......................................................................................7-26

Headmaster Control Valve.....................................................................................................................7-28