Hoshizaki HR24A Service Manual
  1. Manuals
  2. Brands
  3. Hoshizaki Manuals
  4. Refrigerator
  5. HR24A
  6. Service manual

Hoshizaki HR24A Service Manual

Undercounter refrigerator
Hide thumbs Also See for HR24A:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual
Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Undercounter Refrigerator
Model
HR24A
SERVICE MANUAL
Number: 73187
Issued: 12-7-2011

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the HR24A and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Hoshizaki HR24A

Summary of Contents for Hoshizaki HR24A

  • Page 1 Hoshizaki Hoshizaki America, Inc. Undercounter Refrigerator Model HR24A SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com Number: 73187 Issued: 12-7-2011...
  • Page 2 Hoshizaki provides this manual primarily to assist qualified service technicians in the service of this appliance. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance. Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056;...

  • Page 3: Table Of Contents

    IMPORTANT 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. CONTENTS Important Safety Information ....................
  • Page 4 VI. Cleaning and Maintenance Instructions ................. 37 A. Cleaning ........................37 1. Exterior ........................37 2. Cabinet Interior ...................... 37 3. Door Gasket ......................37 4. Shelves ........................37 B. Maintenance ........................ 37 VII. Preparing the Appliance for Periods of Non-Use ............38 VIII.

  • Page 5: Important Safety Information

    Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury.
  • Page 6 WARNING, continued • This appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. •...

  • Page 7: Specifications

    Electrical and Refrigerant Data Design Pressure (PSIG) Refrigerant (oz.) Model AC Supply Voltage Amperes HIGH 134a HR24A 115/60/1 2.80 We reserve the right to make changes in specifications and design without prior notice. B. Storage Capacity and Dimensions 1. Storage Capacity...

  • Page 8: Dimensions

    Side View Additional Dimensions (mm [in.]) Model Interior Width Interior Height Interior Depth Door Stay Open Position HR24A 460 [18.11] 475 [18.70] 450/330 [17.72/13.00] 616 [24.25] We reserve the right to make changes in specifications and design without prior notice.

  • Page 9: General Information

    II. General Information A. Construction 1. HR24A Display Module/Control Board Door Switch Door Lock Door • Evaporator Fan • Evaporator Wire Shelves • Cabinet Thermistor Door Gasket • Evaporator Fan Shroud Condenser Compressor Condensate Wire Harness Drain Line Condensate Drain...

  • Page 10: Sequence Of Operation

    B. Sequence of Operation 1. Sequence Cycles and Shutdown The steps in the sequence are as outlined below. When power is supplied to CB, DM LEDs flash 3 times, then F LED turns on. Press the power button for 2 sec., the °...
  • Page 11 4. Cool Down Restart EvapFM and Comp icons are on. CTh warms to 4°F above setpoint. Comp icon turns on and Comp energizes. 3-min. Comp run timer starts. 5. Defrost Initiation EvapFM and Defrost icons are on. a) Automatic Defrost Initiation: EvapFM and Defrost icons are on. EvapFM continues. 6-hr. DT terminates.

  • Page 12: Sequence Flow Chart

    2. Sequence Flow Chart setpoint above ° setpoint above ° warms...

  • Page 13: Control Board And Display Module

    C. Control Board and Display Module • For factory default settings, see "II.H. Service Menu." • For control board check procedure, see "IV.B. Control Board Check." NOTICE • The control board and display module are fragile; handle very carefully. • The control board and display module contain integrated circuits, which are susceptible to failure due to static discharge.

  • Page 14: Control Board Layout

    1. Control Board Layout Control Board Power Supply Input (115VAC) Compressor (115VAC) Ribbon Cable Control Board Cabinet Thermistor CONTROL BOARD Door Switch (5VDC) RIBBON CABLE Evaporator Fan Motor (12VDC) DISPLAY MODULE Display Module Fig. 1 Display Module 2. Display Module Layout "+"...

  • Page 15: Cabinet Temperature

    D. Cabinet Temperature 1. Default Settings The default CT setpoint is 39°F. The default CT display scale setting is °F. NOTICE! Do not change the CT display scale from °F to °C. All temperature related values in the service menu must be changed manually if the CT display scale is changed from °F to °C.

  • Page 16: Display Module Icons

    E. Display Module Icons Display module icons inform you of energized components and if the appliance is in alarm. Display Module Icons Icon Meaning Compressor Steady: Compressor running. • Flashing: Compressor delay timer. Compressor starts within 2 min. • While adjusting cabinet temperature setpoint. For cabinet temperature setpoint adjustment, see "II.D Cabinet Temperature."...

  • Page 17: Alarm Safeties

    G. Alarm Safeties The alarms are designed to protect the appliance and the items inside. These alarms give information and warnings in the event the appliance is operating out of acceptable parameters. For all alarms except Pr1, the alarm icon turns on and the alarm code alternates with the cabinet temperature.

  • Page 18: Service Menu

    b) Clearing High and Low Temperature Alarms To clear an alarm, follow the steps below. 1) Press the "-" button for 3 sec. to enter the alarm menu. "EnS" is displayed. 2) Press the "-" or "+" button twice. After pressing the "-" or "+" button the first time, "LS" is displayed.
  • Page 19 b) Service Menu Chart Setpoint Service Menu Min. Max. Unit Factory Setting Description See r1 See r2 °C/°F 39°F Cabinet setpoint. (compressor off temperature). (see r0 for compressor on temperature). Thermistor Input (Do Not Adjust) Service Menu Min. Max. Unit Factory Setting Description °C/°F...
  • Page 20 Defrost (Do Not Adjust) Service Menu Min. Max. Unit Factory Setting Description hrs. Defrost interval: 0=no defrost Defrost type. Do not adjust. 0=electric heater 1=hot gas 2=off cycle (evaporator fan motor) °C/°F Limit for defrost if P3 = 1 or 2. min.
  • Page 21 Temperature Alarm (Do Not Adjust) Service Menu Min. Max. Unit Factory Setting Description AL alarm sensor. Do not adjust. 0=cabinet thermistor 1=evaporator thermistor °C/°F Degrees below setpoint for AL alarm when A2=1. Do not adjust. AL alarm. Do not adjust. 0=deactivated 1=A1 relative to setpoint (setpoint - A1)
  • Page 22 Evaporator Fan Motor (Do Not Adjust) Service Menu Min. Max. Unit Factory Setting Description Fan operation with door closed. Do not adjust. 0=off 1=on: see also F13, F14, and L10 2=parallel with compressor 3= dependent on F1 4=disabled when compressor is off, dependent on F1 when compressor is on.
  • Page 23 Serial Network (Do Not Adjust) Service Menu Min. Max. Unit Factory Setting Description Address (not used) Baud Rate (not used) Parity (not used)

  • Page 24: Technical Data

    III. Technical Data A. Refrigeration Circuit Left Side Perimeter Liquid Line Condenser Drier Condensate Pan Evaporator Capillary Tube Evaporator Fan Motor Compressor...

  • Page 25: Wiring Diagram

    B. Wiring Diagram 1. HR24A...

  • Page 26: Service Diagnosis

    IV. Service Diagnosis WARNING • This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Risk of electric shock. Use extreme caution and exercise safe electrical practices. •...
  • Page 27 7) Startup–EvapFM icon is on and Comp icon is flashing. EvapFM energizes. 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.
  • Page 28 c) Defrost Termination: Comp icon is on. EvapFM icon flashing. 30-min. DT terminates. 6-hr. DT starts. Comp icon turns on and Comp energizes. 2-min. EvapFM timer starts. EvapFM icon starts flashing and EvapFM de-energizes. When 2-min. EvapFM timer terminates, EvapFM icon turns steady and EvapFM energizes. Normal operation resumes.

  • Page 29: Control Board Check

    B. Control Board Check Before replacing a CB that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a neutral (W wire) to establish a good neutral connection when checking AC voltage (115VAC).

  • Page 30: Thermistor Check

    b) Defrost Termination: 30-min. DT terminates. Comp icon is on. EvapFM icon flashing. 6-hr. DT starts. Comp icon turns on and Comp energizes. 2-min. EvapFM timer starts. EvapFM icon starts flashing and EvapFM de-energizes. When 2-min. EvapFM timer terminates, EvapFM icon turns steady and EvapFM energizes. Normal operation resumes.

  • Page 31: Diagnostic Chart

    D. Diagnostic Chart Before consulting the diagnostic charts, check the following: • Check the cabinet temperature setpoint and factory default settings. For factory default settings, see "II.D. Cabinet Temperature" and "II.H. Service Menu." • Make sure the doors are not left open or opened too often and that they are sealing properly.
  • Page 32 2. Evaporator is Frozen Up Evaporator is Frozen Up - Possible Cause 1. Evaporator a) Dirty. 2. Evaporator Fan Motor a) Defective. 3. Control Board a) Defective, not operating evaporator fan motor. 4. Refrigerant/Refrigerant Lines a) Gas leak, low charge. b) Refrigerant lines restricted.

  • Page 33: Replacement Of Components

    V. Replacement of Components WARNING • This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Press the power button for 2 sec. to turn off the appliance, then unplug the power cord from the electrical outlet before servicing.

  • Page 34: Brazing

    2. Brazing WARNING • R-134a itself is not flammable at atmospheric pressure and temperatures up to 212°F (100°C). • R-134a itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-134a can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous.

  • Page 35: Important Notes For Component Replacement

    5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets the requirements of ARI Standard 700 (latest edition) be used.

  • Page 36: Door Reversal

    C. Door Reversal If you would like to reverse the door swing, follow the steps below. 1) Make sure the appliance is off and unplugged. 2) Remove the fasteners securing the top panel. See Fig. 1. Being careful not to pull on the wires to the control panel and door switch, lift off the top panel.

  • Page 37: Cleaning And Maintenance Instructions

    VI. Cleaning and Maintenance Instructions A. Cleaning WARNING • Before cleaning the appliance, turn off and unplug the appliance to prevent electric shock by unexpected entrance of water into the appliance or injury by moving parts. • Before cleaning the appliance, move all items into another refrigerator. •...

  • Page 38: Preparing The Appliance For Periods Of Non-Use

    VII. Preparing the Appliance for Periods of Non-Use When shutting down the appliance for more than one week, follow the instructions below. WARNING When preparing the appliance for long storage, prevent the door from closing to reduce the risk of children getting trapped. Leave the shelves in place so that children may not easily climb inside.

  • Page 39: Disposal

    VIII. Disposal WARNING When preparing the appliance for disposal, remove the door to reduce the risk of children getting trapped. Leave the shelves in place so that children may not easily climb inside. This appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations.

Table of Contents