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Manitowoc QY0374A User Manual

Manitowoc QY0374A
175 pages
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ICE MACHINES
Q
-Mode
l
Service Manual
Service Manual
Service Manual
C
2004 Manitowoc Ice, Inc.
80-1597-3
6/04

Table of Contents

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Manitowoc QY0374A Specifications

General IconGeneral
BrandManitowoc
ModelQY0374A
CategoryIce Maker
LanguageEnglish

Summary

Section 1 General Information

Model Numbers

Lists all models covered by the manual.

How to Read a Model Number

Explains the structure and meaning of model numbers.

Ice Cube Sizes

Describes the different ice cube shapes and dimensions.

Model/Serial Number Location

Details where to find the model and serial number decals.

Warranty Coverage

Outlines the terms and conditions of the product warranty.

Section 2 Installation Instructions

General

Provides general guidance for installation.

Ice Machine Dimensions

Lists physical dimensions for various ice machine models.

Ice Storage Bin Dimensions

Provides dimensions for different ice storage bin models.

Remote Condenser Dimensions

Details the physical dimensions of remote condenser units.

Location of Ice Machine

Specifies ideal placement criteria for ice machines.

Stacking Two Ice Machines on a Single Storage Bin

Instructions for safely stacking two ice machines.

Ice Machine Heat of Rejection

Provides BTU/hr heat rejection data for sizing AC equipment.

Leveling the Ice Storage Bin

Step-by-step instructions for leveling ice storage bins.

Air-Cooled Baffle

Instructions for installing the air baffle to prevent air recirculation.

Electrical Service

Covers voltage, fuse/breaker requirements, and ampacity.

Self-Contained Electrical Wiring Connections

Illustrates wiring diagrams for self-contained models.

Remote Electrical Wiring Connections

Illustrates wiring diagrams for remote condenser models.

Water Supply and Drain Requirements

Guidelines for water supply and drain connections.

WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS

Details specifications for water and drain line sizes and connections.

Remote Condenser/Line Set Installation

Covers installation procedures for remote condenser line sets.

GUIDELINES FOR ROUTING LINE SETS

Best practices for routing refrigerant lines for performance and access.

CALCULATING REMOTE CONDENSER INSTALLATION DISTANCES

Provides a formula to calculate maximum line set distances.

LENGTHENING OR REDUCING LINE SET LENGTHS

Procedures for adjusting line set lengths.

CONNECTING A LINE SET

Steps for properly connecting refrigerant line sets.

REMOTE RECEIVER SERVICE VALVE

Instructions for opening the receiver service valve.

Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers

Guidelines and warranty information for using third-party condensers.

NON-MANITOWOC MULTI-CIRCUIT CONDENSER SIZING CHART

Sizing chart for compatible multi-circuit condensers.

Installation Check List

A checklist to verify proper installation steps were completed.

Additional Checks for Remote Models

Specific checks required for remote ice machine installations.

Section 3 Maintenance

Component Identification

Diagrams showing the location of key ice machine components.

Operational Checks

Procedures for verifying proper operation and making adjustments.

HARVEST SEQUENCE WATER PURGE

Adjustment procedure for the harvest sequence water purge.

Cleaning the Condenser

Instructions for cleaning air-cooled and water-cooled condensers.

Interior Cleaning and Sanitizing

Steps for cleaning and sanitizing the ice machine interior.

CLEANING PROCEDURE

Detailed steps for cleaning the ice machine to remove mineral deposits.

SANITIZING PROCEDURE

Detailed steps for sanitizing the ice machine to remove algae or slime.

AUTOMATIC CLEANING SYSTEM (AuCS)

Information on the automatic cleaning system accessory.

Manual Start Operation

Instructions for manually starting a cleaning or sanitizing cycle.

REMOVAL OF PARTS FOR CLEANING/SANITIZING

Procedure for removing components for cleaning and sanitizing.

Water Dump Valve

Procedure for removing and cleaning the water dump valve.

Water Pump

Procedure for removing the water pump for cleaning or replacement.

Ice Thickness Probe

Procedure for removing and cleaning the ice thickness probe.

Water Level Probe

Procedure for removing and cleaning the water level probe.

Water Inlet Valve

Procedure for removing and cleaning the water inlet valve.

Water Distribution Tube

Procedure for removing and cleaning the water distribution tube.

Water Curtain

Procedure for removing and cleaning the water curtain.

Water Treatment/Filtration

Information on water filtration systems and filter replacement.

Removal from Service/Winterization

Procedures for preparing the ice machine for storage or freezing temperatures.

Section 4 Ice Machine Sequence of Operation

Self-Contained Air- and Water-Cooled

Details the operational sequence for self-contained models.

Remote Q450/Q600/Q800/Q1000/Q1300/Q1600/Q1800

Details the operational sequence for remote models.

Section 5 Water System Ice Making Sequence of Operation

INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF

Describes the initial startup and restart process.

FREEZE CYCLE

Explains the steps involved in the ice making freeze cycle.

WATER INLET VALVE SAFETY SHUT-OFF

Details the safety feature that limits water inlet valve operation time.

HARVEST CYCLE

Explains the steps involved in the ice harvesting cycle.

AUTOMATIC SHUT-OFF

Describes the conditions and process for automatic shutdown.

Section 6 Electrical System

Energized Parts Charts

Tables showing which parts are energized during different operational sequences.

Wiring Diagram Sequence of Operation

Explains operational sequences using wiring diagrams.

Freeze Sequence

Details the electrical operations during the freeze cycle.

Harvest Sequence

Details the electrical operations during the harvest cycle.

Automatic Shut-Off

Details the electrical operations during an automatic shutdown.

REMOTE MODELS

Electrical sequences specific to remote ice machine models.

Component Specifications and Diagnostics

Details specifications and diagnostic procedures for key electrical components.

MAIN FUSE

Information on the main fuse function, specifications, and checking.

BIN SWITCH

Explains the function, specifications, and checking of the bin switch.

COMPRESSOR ELECTRICAL DIAGNOSTICS

Procedures for diagnosing compressor electrical issues.

PTCR DIAGNOSTICS

Information and troubleshooting for PTCR components.

ICE/OFF/CLEAN TOGGLE SWITCH

Function, specifications, and checking procedure for the toggle switch.

CONTROL BOARD RELAYS

Details the function and specifications of control board relays.

ELECTRONIC CONTROL BOARD

Overview of the electronic control board and its indicators.

General

General information about the control boards and their transformers.

Safety Limits

Explains built-in safety limits that protect the ice machine.

Inputs

How control board inputs affect the operational sequence.

Ice Thickness Probe (Harvest Initiation)

Explains how the probe works and its role in harvest initiation.

DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY

Troubleshooting steps for ice thickness control circuit malfunctions.

Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe

Diagnosing premature harvest cycles related to the ice thickness probe.

Water Level Control Circuitry

Explains the water level probe and its role in water control.

DIAGNOSING FREEZE CYCLE POTABLE WATER LEVEL CONTROL CIRCUITRY

Troubleshooting steps for water trough overfilling during freeze cycle.

Problem: Water Will Not Run Into The Sump Trough During The Freeze Cycle

Diagnosing issues where water does not fill the trough.

Diagnosing An Ice Machine That Will Not Run

Troubleshooting guide for an ice machine that fails to start.

Section 7 Refrigeration System

Sequence of Operation

Describes the refrigeration cycle steps for self-contained models.

REMOTE MODELS

Describes the refrigeration cycle steps for remote models.

Remote Automatic Shut-Off

Explains the automatic shut-off mechanism for remote models.

Q1300/Q1600/Q1800 REFRIGERATION TUBING SCHEMATICS

Diagrams showing refrigeration tubing for specific models.

Operational Analysis (Diagnostics)

Guidance on analyzing refrigeration system issues and common misdiagnoses.

BEFORE BEGINNING SERVICE

Questions to ask before starting refrigeration system diagnostics.

ICE PRODUCTION CHECK

Procedure for checking ice production rates and conditions.

INSTALLATION/VISUAL INSPECTION CHECKLIST

Checklist for verifying proper installation and identifying issues.

WATER SYSTEM CHECKLIST

Checklist for diagnosing water system problems.

ICE FORMATION PATTERN

Analysis of ice formation patterns to diagnose refrigeration issues.

SAFETY LIMITS

Explains safety limits that protect the ice machine from component failure.

Analyzing Why Safety Limits May Stop the Ice Machine

Explains external factors that can cause safety limits to engage.

Safety Limit #1

Details the freeze time safety limit and its troubleshooting.

Safety Limit #2

Details the harvest time safety limit and its troubleshooting.

ANALYZING DISCHARGE PRESSURE DURING FREEZE OR HARVEST CYCLE

Procedure for analyzing discharge pressure readings.

ANALYZING SUCTION PRESSURE DURING FREEZE CYCLE

Procedure for analyzing suction pressure readings.

Freeze Cycle Suction Pressure High Checklist

Potential causes and checks for high suction pressure.

Freeze Cycle Suction Pressure Low Checklist

Potential causes and checks for low suction pressure.

SINGLE EXPANSION VALVE ICE MACHINES - COMPARING EVAPORATOR INLET AND OUTLET TEMPERATURES

Procedure for comparing evaporator inlet/outlet temperatures.

HARVEST VALVE TEMPERATURE CHECK

Procedure for checking harvest valve temperatures.

DISCHARGE LINE TEMPERATURE ANALYSIS

Analyzing discharge line temperature for diagnostic purposes.

HOW TO USE THE REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES

Guide on how to effectively use operational analysis tables.

REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES

Tables for diagnosing refrigeration problems based on system parameters.

HARVEST PRESSURE REGULATING (H.P.R.) SYSTEM

Explanation of the HPR system for remote models.

HPR DIAGNOSTICS

Diagnostic steps for the HPR system.

HEADMASTER CONTROL VALVE

Operation and diagnosis of the headmaster control valve.

LOW ON CHARGE VERIFICATION

Procedure to verify if the system is low on refrigerant charge.

FAN CYCLE CONTROL VS. HEADMASTER

Comparison of fan cycle control and headmaster functions.

Pressure Control Specifications and Diagnostics

Specifications and diagnostic procedures for pressure controls.

SYSTEM CONTAMINATION CLEAN-UP

Requirements for restoring contaminated refrigeration systems.

Mild System Contamination Cleanup Procedure

Steps for cleaning systems with mild contamination.

Severe System Contamination Cleanup Procedure

Steps for cleaning systems with severe contamination.

NORMAL EVACUATION PROCEDURE

Standard procedure for system evacuation.

REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE

Procedure for replacing controls without releasing refrigerant.

FILTER-DRIERS

Information on filter-driers and their importance.

TOTAL SYSTEM REFRIGERANT CHARGES

Table of refrigerant charge capacities for different models.

REFRIGERANT DEFINITIONS

Definitions of refrigerant terms like recover, recycle, and reclaim.

REFRIGERANT RE-USE POLICY

Manitowoc's policy on refrigerant reuse and approved types.

HFC REFRIGERANT QUESTIONS AND ANSWERS

Common questions and answers regarding HFC refrigerants.

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