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Hoshizaki KML-451MAH Service Manual

Hoshizaki KML-451MAH
77 pages
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Hoshizaki
“A Superior Degree
of Reliability”
www.hoshizaki.com
Models
KMD-460MAH, MWH
KMD-530MAH, MWH, MRH
KML-250MAH, MWH
KML-351MAH, MWH
KML-451MAH, MWH
KML-631MAH, MWH, MRH
Modular Crescent Cuber with
"G" Control Board
Hoshizaki America, Inc.
SERVICE MANUAL
Number: 73205
Issued: 5-7-2015

Table of Contents

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Hoshizaki KML-451MAH Specifications

General IconGeneral
Condenser TypeAir-Cooled
RefrigerantR-404A
TypeModular Ice Maker
Ice TypeCrescent
Power Supply115V/60Hz/1Ph
Storage CapacityNot applicable (modular unit)

Summary

Important Safety Information

Construction and Water/Refrigeration Circuit Diagram

Construction

Description of the physical components and assembly of the icemaker.

Water/Refrigeration Circuit Diagram

Schematic representation of the icemaker's water and refrigeration circuits.

Sequence of Operation and Service Diagnosis

Sequence of Operation Flow Chart

Visual representation of the icemaker's operational cycles.

Service Diagnosis

Troubleshooting steps and diagnostic procedures for icemaker faults.

Control Board Check

Thermostatic Bin Control Check

Procedure to test the thermostatic bin control switch for proper operation.

Mechanical Bin Control Check and Cleaning

How to check and clean the mechanical bin control switch.

Float Switch Check and Cleaning

Float Switch Check

Steps to verify the float switch's continuity and operation.

Float Switch Cleaning

Instructions for cleaning the icemaker's float switch.

Thermistor Check

Diagnostic Tables

No Ice Production

List of potential causes for the icemaker not producing ice.

Freeze-Up

List of potential causes for the icemaker freezing up.

Low Ice Production

List of potential causes for reduced icemaker production.

Controls and Adjustments

Control Board Layout

Diagram showing the layout and components of the 'G' control board.

LED Lights and Audible Alarm Safeties

Explanation of control board LEDs and audible alarm indicators.

Settings and Adjustments

Details on default dip switch settings for various models and functions.

Harvest Timer (S4 dip switch 1 & 2)

Explanation of the harvest timer settings and their effect on operation.

Pump-Out Timer (S4 dip switch 3 & 4)

Explanation of pump-out timer settings and drain cycle duration.

Pump-Out Frequency Control (S4 dip switch 5 & 6)

Configuration for how often pump-out cycles occur.

Harvest Pump Timer Operation (S4 dip switch 7)

Operation details for the harvest pump timer setting.

Freeze Timer (S4 dip switch 9 & 10)

Setting the maximum freeze time to prevent issues.

Float Switch Selector (S5 dip switch 1)

Function of the S5 dip switch for float switch selection.

Refill Counter, Program Selector (S5 dip switch 2, 3, and 5)

Function of S5 dip switches for refill counter and program selection.

Switches

Control Switch

Details on the three positions of the control switch: OFF, ICE, SERVICE.

Service Switch

Operation of the service switch positions: DRAIN, CIRCULATE, WASH.

Refrigeration Circuit and Component Service Information

Refrigeration Circuit Service Information

Guidelines and warnings for servicing the refrigeration circuit.

Brazing

Procedure and safety precautions for brazing refrigeration components.

Evacuation and Recharge (R-404A)

Steps for evacuating and recharging the R-404A refrigeration system.

Component Service Information

Water Regulating Valve Adjustment (water-cooled model)

Procedure for adjusting the water regulating valve on water-cooled models.

Maintenance

Preparing the Appliance for Periods of Non-Use

Remove the water from the icemaker water line

Steps to remove water from the icemaker's internal water lines.

Drain the water tank

Procedure to drain the icemaker's water tank.

On water-cooled model, remove the water from the water-cooled condenser

Procedure to remove water from the condenser on water-cooled models.

Disposal

Technical Information

Specification and Performance Data Sheets

Detailed performance data including ice production, consumption, and pressures.

KMD-460MAH

Specification and performance data for the KMD-460MAH model.

KMD-460MWH

Specification and performance data for the KMD-460MWH model.

KMD-530MAH

Specification and performance data for the KMD-530MAH model.

KMD-530MWH

Specification and performance data for the KMD-530MWH model.

KMD-530MRH

Specification and performance data for the KMD-530MRH model.

KML-250MAH

Specification and performance data for the KML-250MAH model.

KML-250MWH

Specification and performance data for the KML-250MWH model.

KML-351MAH

Specification and performance data for the KML-351MAH model.

KML-351MWH

Specification and performance data for the KML-351MWH model.

KML-451MAH

Specification and performance data for the KML-451MAH model.

KML-451MWH

Specification and performance data for the KML-451MWH model.

KML-631MAH

Specification and performance data for the KML-631MAH model.

KML-631MWH

Specification and performance data for the KML-631MWH model.

KML-631MRH

Specification and performance data for the KML-631MRH model.

Wiring Diagrams

Operation with Thermostatic Bin Control and without Harvest Pump Timer

Wiring for models using thermostatic bin control and no harvest pump timer.

Harvest Pump Timer Operation with Thermostatic or Mechanical Bin Control

Wiring for models with harvest pump timer and bin control.

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