Contents
Number Issued
Undercounter Refrigerator Model HR24A
“A Superior Degree of Reliability”
HoshizakiHoshizaki America, Inc
Complete and detailed explanation of the problem
HOSHIZAKI AMERICA, INC 618 Highway 74 South
Peachtree City, GA
Attn Hoshizaki Technical Support Department
CONTENTS
VI. Cleaning and Maintenance Instructions
A. Cleaning
B. Maintenance
1. Exterior
Important Safety Information
WARNING, continued
I. Specifications
B. Storage Capacity and Dimensions
A. Electrical and Refrigerant Data
1. Storage Capacity
2. Dimensions
Unit mm in
II. General Information A. Construction
1. HR24A
B. Sequence of Operation
aRefrigerator
1. Startup
2. Cool Down
4. Cool Down Restart
5. Defrost Initiation
6. Defrost Termination
7. Energy Saving Mode
HR24A Sequence Flow Chart
2. Sequence Flow Chart
1. Startup
2. Cool Down
C. Control Board and Display Module
1. Control Board Layout
2. Display Module Layout
D. Cabinet Temperature
aAdjusting the Temperature Setpoint
b Manual Defrost
1. Default Settings
E. Display Module Icons
F. Control Panel Lockout
G. Alarm Safeties
a High and Low Temperature Alarm Values AH or AL
H.Service Menu
a Service Menu Access
1Enter Service Menu
2Service Menu List
b Service Menu Chart
Defrost Do Not Adjust
Service Menu
Factory Setting
Unit
Temperature Alarm Do Not Adjust
Service Menu
Factory Setting
Unit
Evaporator Fan Motor Do Not Adjust
Serial Network Do Not Adjust
Service Menu
Factory Setting
Unit
III. Technical Data A. Refrigeration Circuit
Left Side Perimeter Liquid Line Condenser Drier
Evaporator Capillary Tube Evaporator Fan Motor
Compressor
B. Wiring Diagram
1. HR24A
IV. Service Diagnosis
A.Diagnostic Procedure
2-min.Comp delay timer starts. Comp icon flashes until 2-min.Comp delay timer terminates. Diagnosis Check that CT LEDs and EvapFM icon turn on. Next, check that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC. If 5VDC is not present, check DS activation lever and DS continuity. Note DS contacts are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for 12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring connector for loose connection, EvapFM continuity, and fan blade for binding
12Energy Saving Mode
B. Control Board Check
Startup and Cool Down
10Defrost
C. Thermistor Check
D. Diagnostic Chart
1.Appliance Not Cooling
2. Evaporator is Frozen Up
3. Defrost Fails to Start or Terminate
Evaporator is Frozen Up - Possible Cause
V. Replacement of Components
A.Service for Refrigerant Lines
1.Refrigerant Recovery
2. Brazing
3.Evacuation and Recharge R-134a
B.Important Notes for Component Replacement
C. Door Reversal
A. Cleaning
B. Maintenance
VI. Cleaning and Maintenance Instructions
When shutting down the appliance for more than one week, follow the instructions below
VIII. Disposal