Hoshizaki KM-420MWJ Service Manual

Name: Hoshizaki KM-420MWJ
Brand: Hoshizaki
Rating: 4 (1 reviews)

89 pages

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Models

KM-350MAJ, MWJ

KM-420MAJ, MWJ, MRJZ

KM-520MAJ, MWJ, MRJ(Z)

KM-660MAJ, MWJ, MRJ(Z)

Modular Crescent Cuber

Service Manual

Number: 73230

Issued: 10-29-2018

Revised: 11-7-2023

hoshizakiamerica.com

Table of Contents3
Important Safety Information5
Construction and Water/Refrigeration Circuit Diagrams7
Construction7
Air-Cooled Models (MAJ)7
Water-Cooled Models (MWJ)8
Remote Models (MRJ, MRJZ )9
Water/Refrigeration Circuit Diagrams10
Air-Cooled Models (MAJ)10
Water-Cooled Models (MWJ)11
Remote Models (MRJ, MRJZ)12
Sequence of Operation and Service Diagnosis13
Sequence of Operation Flow Charts13
Operation Flow Chart13
Shutdown Flow Chart14
Service Diagnosis15
K Control Board (2A8242-02) with Ultrasonic bin Control15
K Control Board (2A8242-02) with Mechanical bin Control22
K+ Control Board (2A9678-01) with Ultrasonic bin Control29
Control Board Check36
Bin Control Check, Adjustment, and Cleaning38
Float Switch Check and Cleaning44
Thermistor Check46
Control Switch46
Mode Switch46
Diagnostic Tables47
Freeze-Up Check List51
Controls and Adjustments52
Control Board Layout53
K Control Board (2A8242-02)53
K+ Control Board (2A9678-01)54
LED Lights and Audible Alarm Safeties55
K Control Board (2A8242-02)55
K+ Control Board (2A9678-01)56
Settings and Adjustments57
Default Dip Switch Settings57
Harvest Time (S4 Dip Switch 1 & 2)58
Pump-Out Time/Harvest Time During Pump-Out (S4 Dip Switch 3 & 4)58
Pump-Out Frequency Control (S4 Dip Switch 5)59
Harvest Pump Time (Harvest Assist) (S4 Dip Switch 6)59
Harvest Pump Time (Harvest Assist (S4 Dip Switch 7)60
Factory Use (S4 Dip Switch 8)60
Freeze Timer (S4 Dip Switch 9 & 10)60
Float Switch Selector (S5 Dip Switch 1)61
Refill Counter (S5 Dip Switch 2 and 3)61
Minimum Harvest Time (S5 Dip Switch 4)61
Anti-Slush (S5 Dip Switch 5)62
Refrigeration Circuit and Component Service Information63
Refrigeration Circuit Service Information63
Refrigeration Circuit Service Information66
Component Service Information69
Water Regulating Valve Adjustment (Water-Cooled Model)69
Maintenance70
Preparing the Appliance for Periods of Non-Use71
Disposal73
Technical Information74
Specification and Performance Data Sheets74
Km-350Maj74
Km-350Mwj75
Km-420Maj76
Km-420Mwj77
KM-420MRJZ with URC-5FZ78
Km-520Maj79
Km-520Mwj80
KM-520MRJ with URC-5F81
KM-520MRJZ with URC-5FZ82
Km-660Maj83
Km-660Mwj84
KM-660MRJ with URC-5F85
KM-660MRJZ with URC-5FZ86
Wiring Diagrams87
K Control Board (2A8242-02) with Ultrasonic bin Control87
K Control Board (2A8242-02) with Mechanical bin Control88
K+ Control Board (2A9678-01) with Ultrasonic bin Control89

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Hoshizaki KM-420MWJ Specifications

General

Brand	Hoshizaki
Model	KM-420MWJ
Category	Ice Maker
Language	English

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