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Manitowoc P Series User Manual

Manitowoc P Series
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4-5
Section 4 Maintenance
Water Dump Valve
The water dump valve normally does not require
removal for cleaning.
To determine if removal is necessary:
1. Locate the water dump valve.
2. Set the toggle switch to ICE.
3. While the ice machine is in the freeze mode,
check the dump valve’s clear plastic outlet drain
hose for leakage.
A. If the dump valve is leaking, remove,
disassemble and clean it.
B. If the dump valve is not leaking, do not
remove it. Instead, follow the “Cleaning
Procedure” on page 4-2.
Follow the procedure below to remove the dump
valve.
Dump Valve Removal
WARNING
Disconnect the electric power to the ice machine at
the electric service switch box and turn off the
water supply before proceeding.
1. If so equipped, remove the water dump valve
shield from its mounting bracket.
2. Lift and slide the coil retainer cap from the top of
the coil.
3. Note the position of the coil assembly on the
valve for assembly later. Leaving the wires
attached, lift the coil assembly off the valve body
and the enclosing tube.
4. Press down on the plastic nut on the enclosing
tube and rotate it 1/4 turn. Remove the enclosing
tube, plunger, and plastic gasket from the valve
body.
NOTE: At this point, the water dump valve can easily
be cleaned. If complete removal is desired, continue
with step 5.
Important
The plunger and the inside of the enclosing tube
must be completely dry before assembly.
NOTE: During cleaning, do not stretch, damage or
remove the spring from the plunger. If it is removed,
slide the spring’s flared end into the plunger’s slotted
top opening until the spring contacts the plunger
spring stop.
5. Remove the valve body.
6. Remove the tubing from the dump valve by
twisting the clamps off.
7. Remove the two screws securing the dump valve
and the mounting bracket.
Dump Valve Disassembly
CAP
COIL
ENCLOSING
TUBE
PLUNGER
SPRING STOP
DIAPHRAM
VALVE BODY
SPRING
PLUNGER

Table of Contents

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Manitowoc P Series Specifications

General IconGeneral
BrandManitowoc
ModelP Series
CategoryIce Maker
LanguageEnglish

Summary

Safety Notices

WARNING

Alerts to potential personal injury situations. Read statement and proceed carefully.

CAUTION

Alerts to potential machine damage situations. Read statement and proceed carefully.

Procedural Notices

Important

Highlights key information for operators and technicians for efficient procedure performance.

NOTE

Provides simple, but useful, extra information.

General Information

Model Numbers

Lists the ice machine models covered by this manual.

Accessories

Lists optional accessories available for Manitowoc ice machines.

Model and Serial Number Location

Details where to find model and serial numbers on the ice machine.

Owner Warranty Registration Card

Instructions for validating warranty coverage by returning the registration card.

Warranty Coverage

Outlines warranty terms for parts, labor, and exclusions.

Installation Instructions

General Installation Guidance

Provides guidance for qualified installers on obtaining start-up services.

Ice Machine Dimensions

Provides physical dimensions for P-520 and P-530 ice machines.

Location Criteria

Criteria for selecting appropriate locations for the ice machine and condensing unit.

Leveling the Ice Machine

Steps for properly leveling the ice machine using adjustable legs.

Electrical Service Requirements

Details electrical requirements, voltage, grounding, and circuit protection.

Water Service and Drain Connections

Guidelines for water supply, water inlet lines, and drain connections.

Water Supply and Drain Line Sizing

Specifies water temp, pressure, and fitting sizes for connections.

Refrigerant Charge Information

Details refrigerant charge for different configurations and ambient temperatures.

Four Ice Machine Installations

Procedures for adding a fourth ice machine to a system.

Line Set Installation and Routing

Information on line sets and guidelines for routing refrigerant lines.

Connecting and Modifying Line Sets

Procedures for connecting line sets and modifying lengths, with torque specs.

Installation Checklist

A checklist for all installation steps before starting the machine.

Ice Machine Operation

Component Identification

Diagrams identifying key components of the P520 and P530 models.

Ice Making Sequence of Operation

Detailed explanation of the freeze and harvest cycles of the ice machine.

Operational Checks

Checks for proper operation after initial setup or long shutdowns.

Water Level Monitoring

Information on the water level sensor, probe, and checks for damage.

Ice Thickness Check and Adjustment

How to check and adjust the ice thickness probe for optimal ice production.

Harvest Sequence Water Purge Adjustment

Adjustment for the harvest sequence water purge duration.

Maintenance Procedures

General Maintenance Overview

Overview of maintenance responsibilities and frequency recommendations.

Ice Machine Inspection

Routine inspection for leaks and proper line routing.

Exterior Cleaning

Instructions for cleaning the exterior surfaces of the ice machine.

Cleaning the Condenser

Importance and procedure for cleaning the condenser for optimal airflow.

Interior Cleaning and Sanitizing

Steps for cleaning and sanitizing the interior components of the ice machine.

Self-Cleaning and Sanitizing Procedures

Detailed steps for using the automatic self-cleaning and sanitizing features.

Removal of Parts for Cleaning

Procedures for removing components for thorough cleaning and sanitizing.

Water Dump Valve Maintenance

Determining if the water dump valve needs cleaning and removal procedures.

Water Pump and Ice Thickness Probe Removal

Procedures for removing the water pump and ice thickness probe.

Water Level Probe and Inlet Valve Maintenance

Procedures for removing water level probe and inlet valve for cleaning.

Water Distribution Tube and Curtain Cleaning

Procedure for removing and cleaning the water distribution tube and curtain.

Water Treatment and Filter Replacement

Importance of water treatment and procedure for replacing filter cartridges.

Removal from Service and Winterization

Procedures for preparing the ice machine for storage or cold environments.

Before Calling for Service

Troubleshooting Checklist

A checklist to identify common problems and their solutions before calling service.

Safety Limit Feature Explanation

Explanation of built-in safety limits that stop the machine for component protection.

Safety Limit Stand-By Mode and Restart

How the machine behaves after safety limit shutdowns and restart procedures.

Service Diagnostics

Electrical System Overview

Overview of electrical components and the ice making sequence chart.

Component Specifications and Diagnostics

Detailed specs and diagnostic procedures for key components.

Main Fuse Check

Function, specifications, and check procedure for the main fuse.

Bin Switch Operation

Function, specifications, and check procedure for the bin switch.

Ice/Off/Clean Toggle Switch

Function, specifications, and check procedure for the mode selection toggle switch.

Harvest Heater Element

Function, specifications, and check procedure for the harvest heater element.

Harvest Heater Thermostat

Function, specifications, and diagnostic procedure for the thermostat.

Low Pressure Cut-Out Control

Function, specifications, and diagnostic procedure for the LPC.

Suction Solenoid Valve

Function, specifications, and check procedure for the suction solenoid valve.

Line Set Isolation Valves

Function, specifications, and procedure for operating line set isolation valves.

Evaporator Removal Procedures

Detailed procedures for removing the evaporator assembly for P-530 and P-520.

Electronic Control Board

Diagram and general information about the electronic control board and its functions.

Safety Limit System

Explanation of built-in safety limits that protect the ice machine from component failure.

Determining Safety Limit Activation

Procedures to identify the specific safety limit that caused the machine to stop.

Analyzing Safety Limit Causes

Discusses common causes for safety limit activation and the need for technician analysis.

Safety Limit #1 Troubleshooting

Details Safety Limit #1 (freeze time) and its possible causes and corrections.

Safety Limit #2 Troubleshooting

Details Safety Limit #2 (harvest time) and its possible causes and corrections.

Safety Limit Notes and Stand-By Mode

Notes on safety limit codes, stand-by mode, and restart procedures.

Ice Thickness Probe Functionality

How the ice thickness probe works to initiate harvest and related features.

Maximum Freeze Time Safety

Information on the built-in safety timer that limits freeze cycle duration.

Ice Thickness Check and Adjustment

How to check and adjust the ice thickness probe for optimal ice production.

Diagnosing Ice Thickness Control Circuitry

Diagnostic steps for when the machine does not cycle into harvest.

Diagnosing Premature Harvest Cycles

Diagnostic steps for when the machine harvests prematurely before water contact.

Water Level Control Circuitry

Explanation of how the water level control circuit maintains water levels.

Water Inlet Valve Safety Shut-Off

The safety feature that limits water inlet valve operation time.

Diagnosing Water Trough Overfilling

Diagnostic procedure for water trough overfilling during the freeze cycle.

Diagnosing Water Not Filling Sump Trough

Diagnostic procedure for when water does not fill the sump trough during the freeze cycle.

Wiring Diagram P520/P530 Ice Machines

Electrical wiring diagram showing connections for P520/P530 ice machines.

Tubing Diagram Typical Installation

Diagram illustrating the typical refrigerant tubing installation for P520/P530 models.

24 Hour Production Charts

Charts showing ice production capacity based on ambient and water temperatures.

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