Table Of Contents - Hoshizaki Steelheart Series Service Manual

This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this booklet for any further reference that may be necessary.
Important Safety Information ................................................................................................. 4
I. Construction and Refrigeration Circuit Diagram ................................................................. 8
A. Construction .................................................................................................................. 8
B. Refrigeration Circuit Diagram ........................................................................................ 9
II. Sequence of Operation and Service Diagnosis ............................................................... 10
A. Sequence of Operation Flow Chart ............................................................................ 10
B. Service Diagnosis ....................................................................................................... 12
C. Thermistor Check ........................................................................................................ 19
D. Diagnostic Table .......................................................................................................... 20
III. Controls and Adjustments ............................................................................................. 22
A. Control Modules .......................................................................................................... 23
B. Temperature ................................................................................................................ 26
1. Default Temperature Settings ................................................................................... 26
2. Temperature Setpoint .............................................................................................. 26
3. Adjusting the Temperature Setpoint for Rail Area Cooling ....................................... 26
4a. Cabinet Temperature Control - Cabinet Control Module 4A7178-01 ...................... 27
4b. Cabinet Temperature Control - Cabinet Control Module 4A7053-01 ...................... 29
C. Manual Defrost ............................................................................................................ 31
D. Cabinet Control Alarm Safeties ................................................................................... 31
1a. Cabinet Control Module: 4A7178-01 ...................................................................... 31
1b. Cabinet Control Module: 4a7053-01 ...................................................................... 32
E. Safety Devices ............................................................................................................ 32
IV. Refrigeration Circuit and Component Service Information.............................................. 33
A. Refrigeration Circuit Service Information .................................................................... 35
1. Refrigerant Recovery ............................................................................................... 35
2. Brazing .................................................................................................................... 36
3. Evacuation ............................................................................................................... 36
B. Component Service Information .................................................................................. 38
V. Maintenance .................................................................................................................... 39
VI. Preparing the Appliance for Periods of Non-Use ............................................................ 40
VII. Disposal ......................................................................................................................... 41
VIII. Technical Information .................................................................................................... 42
A. Electrical and Refrigerant Data ................................................................................... 42
B. Wiring Diagrams .......................................................................................................... 43
IMPORTANT
CONTENTS
3