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