Hoshizaki HR24A Service Manual Download Page 1

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Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Model
HR24A

Undercounter Refrigerator

Hoshizaki America, Inc.

Number: 73187

Issued: 12-7-2011

SERVICE MANUAL

Summary of Contents for HR24A

Page 1: ...Hoshizaki A Superior Degree of Reliability www hoshizaki com Model HR24A Undercounter Refrigerator Hoshizaki America Inc Number 73187 Issued 12 7 2011 SERVICE MANUAL ...

Page 2: ...tallation is not covered under warranty 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...

Page 3: ...chnical Data 24 A Refrigeration Circuit 24 B Wiring Diagram 25 IV Service Diagnosis 26 A Diagnostic Procedure 26 B Control Board Check 29 C Thermistor Check 30 D Diagnostic Chart 31 V Replacement of Components 33 A Service for Refrigerant Lines 33 1 Refrigerant Recovery 33 2 Brazing 34 3 Evacuation and Recharge R 134a 34 B Important Notes for Component Replacement 35 C Door Reversal 36 IMPORTANT T...

Page 4: ...leaning 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 Disposal 39 ...

Page 5: ... regulations This appliance requires an independent power supply of proper capacity See the nameplate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuse damage to existing wiring or component failure This could lead to heat generation or fire THIS APPLIANCE MUST BE GROUNDED This appliance is equipped with a NEMA 5 ...

Page 6: ...le spray or place volatile or flammable substances near the appliance They might catch fire Keep the area around the appliance clean Dirt dust or insects in the appliance could cause harm to individuals or damage to the appliance NOTICE Protect the floor when moving the appliance to prevent damage to the floor Keep ventilation openings in the appliance enclosure or in the built in structure clear ...

Page 7: ...e Amperes Design Pressure PSIG Refrigerant oz HIGH LOW 134a HR24A 115 60 1 4 360 120 2 80 We reserve the right to make changes in specifications and design without prior notice B Storage Capacity and Dimensions 1 Storage Capacity Storage Capacity Model Interior Storage Capacity ft3 Total Shelf Space ft2 HR24A 3 67 2 26 We reserve the right to make changes in specifications and design without prior...

Page 8: ... 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: ...Control Board Condenser Door Door Gasket Start Relay Door Switch Compressor Condensate Drain Pan Power Cord Evaporator Fan Evaporator Cabinet Thermistor Evaporator Fan Shroud Door Lock Drier Capillary Tube Compressor Wire Harness Condensate Drain Line Wire Shelves ...

Page 10: ... appliance uses a time initiated time terminated Comp off cycle defrost The factory default defrost setting is once every 6 hours for 30 min 6 hr defrost timer starts the very first time CB is energized factory testing Defrost time is cumulative power on time therefore time may vary between starting the appliance and the first defrost After the first defrost defrost can be monitored for activation...

Page 11: ... is on EvapFM icon flashing 30 min DT terminates 6 hr DT starts Comp icon turns on and Comp energizes 3 min Comp run timer starts 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 7 Energy Saving Mode ESM initiates during periods of inactivity Once CTh cools to setpoint 20 min ESM timer sta...

Page 12: ...min There is a Comp delay of 2 min after a power interruption To initiate manual defrost press and hold the button until the defrost icon turns on the display module Defrost lasts 30 min Power on EvapFM continues Comp de energized EvapFM energized 3 min Comp run timer starts 30 min DT terminates 6 hr DT starts 2 Cool Down CTh 4 F above setpoint 2 min Comp delay Comp icon flashes during Comp delay ...

Page 13: ... susceptible to failure due to static discharge It is especially important to touch the metal part of the appliance before handling or replacing the control board and display module Do not touch the electronic devices on the control board and display module or the back of the control board or display module Do not change wiring and connections Do not misconnect terminals Do not short out power sup...

Page 14: ...AC Cabinet Thermistor Door Switch 5VDC Evaporator Fan Motor 12VDC Control Board Display Module Ribbon Cable Display Module Control Board Compressor Icon Display Defrost Icon Evaporator Fan Motor Icon Power Button P Set Button Up Button Down Button Alarm Icon C F F LED Cabinet Temperature LEDs Fig 2 2 Display Module Layout ...

Page 15: ... Comp icon flashes on DM 2 Press the or button until the desired value is displayed 3 Press the P button to save the new CT setpoint and return to the CT display If no button is pressed for 15 sec after selecting the new CT setpoint DM returns to CT display and the new CT setpoint is saved b Manual Defrost To initiate a manual defrost press and hold the button until the defrost icon turns on 30 mi...

Page 16: ... is running Evaporator fan motor de energizes when door is open During energy saving mode evaporator fan motor cycles with compressor When compressor is de energized evaporator fan motor cycles 1 min on and 5 min off Alarm Appliance is in alarm See II G Alarm Safeties for details F Control Panel Lockout The control panel can be locked to help prevent the appliance from being turned off or the setp...

Page 17: ... corrections do not bring the temperature back in range see IV Service Diagnosis Automatically resets when temperature returns to normal Alarm icon flashes until reset manually Ld Door Open Close the door Pr1 Cabinet Thermistor Malfunction Alarm Cabinet thermistor has failed Compressor and evaporator fan motor cycle 10 min on 10 min off a High and Low Temperature Alarm Values AH or AL If an AH or ...

Page 18: ...arranty coverage Note If the display module panel is locked press and hold the button and the power button until UnL appears briefly on the display module a Service Menu Access 1 Enter Service Menu 1 Make sure the appliance is plugged into the electrical outlet and power is on 2 Press and hold the and buttons until PA is displayed 3 Press the P button 0 is displayed Using the button set the displa...

Page 19: ...ion Do Not Adjust Service Menu Min Max Unit Factory Setting Description r0 0 15 C F 4 F Temperature differential above setpoint for the compressor to turn on r1 99 r2 C F 34 F Minimum cabinet setpoint r2 r1 99 C F 52 F Maximum cabinet setpoint r3 0 1 0 Locked setpoint 0 no 1 yes r4 0 99 C F 0 Energy saving and overcooling Do not adjust r5 0 99 C F 0 r6 0 240 min 30 Compressor Protection Do Not Adj...

Page 20: ...binet temperature 1 cabinet temperature or setpoint differential 4 F Based on cabinet temperature at defrost initiation d7 0 15 min 0 Drip time Do not adjust d8 0 3 0 Defrost initiation Do not adjust 0 d0 defrost timer is cumulative power on time 1 d0 defrost timer is cumulative compressor run time 2 defrost starts when evaporator temperature d9 for time d0 3 based on evaporator temperature when e...

Page 21: ...erature A1 A4 99 99 C F 10 Degrees above setpoint for AH alarm when A5 1 Do not adjust A5 0 2 1 AH alarm Do not adjust 0 deactivated 1 A4 relative to setpoint setpoint A4 2 absolute AH occurs at temperature A4 A6 0 240 min 120 AH delay after startup Do not adjust A7 0 240 min 120 Delay for AL or AH alarm to occur after temperature is below A1 or above A4 Do not adjust A8 0 240 min 15 AH delay afte...

Page 22: ... 4 F1 differential F9 0 240 sec 0 Energy saving evaporator fan motor delay after compressor shuts off F13 0 240 min 5 Energy saving evaporator fan motor off time F14 0 240 min 1 Energy saving evaporator fan motor on time Door Switch and Door Alarm Do Not Adjust Service Menu Min Max Unit Factory Setting Description L0 0 5 2 Door switch function 1 compressor and evaporator fan motor de energized 2 e...

Page 23: ...23 Serial Network Do Not Adjust Service Menu Min Max Unit Factory Setting Description LA 1 247 247 Address not used Lb 0 3 2 Baud Rate not used LP 0 2 2 Parity not used ...

Page 24: ...24 III Technical Data A Refrigeration Circuit Evaporator Capillary Tube Compressor Drier Condenser Left Side Perimeter Liquid Line Condensate Pan Evaporator Fan Motor ...

Page 25: ...25 B Wiring Diagram 1 HR24A ...

Page 26: ... on the display module The F and cabinet temperature LEDs remain on throughout the sequence of operation This appliance uses a time initiated time terminated Comp off cycle defrost The factory default defrost setting is once every 6 hours for 30 min 6 hr defrost timer starts the very first time CB is energized during factory testing Defrost time is cumulative power on time therefore time may vary ...

Page 27: ...FM icon is on CTh cools to setpoint default 39 F EvapFM continues If Comp run time 3 min Comp icon turns off and Comp de energizes If Comp run time 3 min Comp continues until 3 min Comp run timer terminates then Comp icon turns off and Comp de energizes Diagnosis If CTh is in range and Comp does not de energize confirm Comp run time 3 min If Comp continues after 3 min Comp run timer terminates rep...

Page 28: ...If 115VAC is not present replace CB If 115VAC is present and Comp is off check Comp wire harness connections Comp external protector integrated with start relay Comp start components and Comp motor winding continuity 12 Energy Saving Mode ESM initiates during periods of inactivity Once CTh cools to setpoint 20 min ESM timer starts DS must remain engaged without activation door open for 20 min afte...

Page 29: ...nce 8 Check that CT LEDs and EvapFM icon turn on If not check for 115VAC at the POWER connector on CB If 115VAC is not present check power cord and power supply If 115VAC is present and DM is not on F and CT LEDs and EvapFM icon replace CB 9 If F and CT LEDs are on but EvapFM icon is not confirm DS is engaged pushed in contacts open Check across DS for 5VDC If 5VDC is not present check DS activati...

Page 30: ...resistance varies depending on temperature The control board monitors the resistance to control system operation No adjustment is required In the event the cabinet thermistor reading is out of range Pr1 alarm the compressor operates on a fixed time basis of 10 min on and 10 min off To check thermistor resistance follow the steps below 1 Press the power button for 2 sec to turn the appliance off th...

Page 31: ...The appliance must have a minimum of 1 3 cm clearance at bottom and top Air must be able to circulate freely under behind and above the appliance Check the control board using the steps in IV B Control Board Check 1 Appliance Not Cooling Appliance Not Cooling Possible Cause 1 Power Supply a Unplugged off blown fuse or tripped or defective breaker b Loose connection c Not within specifications 2 Co...

Page 32: ...aporator 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 3 Defrost Fails to Start or Terminate Defrost Fails to Start or Terminate Possible Cause 1 Control Board a Defective ...

Page 33: ...ore it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 min when replacing or servicing parts The Polyol Ester POE oils used in R 134a appliances can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts Always install a new drier every time the se...

Page 34: ...row on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do n...

Page 35: ...cylinder is not equipped with a dip tube invert the service cylinder then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 Close the high side valve on the gauge manifold then close the refrigerant access valve if applicable Disconnect the gauge manifold hose 9 Cap the access valve to prevent a po...

Page 36: ...the lower left side of the appliance 6 Remove the lower hinge from the right side of the appliance then secure it to the left side of the appliance 7 Place the 2 plastic plugs in the holes on the lower right side of the appliance 8 Remove the plastic plugs and the handle from the door 9 Secure the handle to the right side of the door Place the plugs in the open handle holes on the left side of the...

Page 37: ...uring pad and especially those strong cleaners for use on a ventilating fan or a cooking range Also to prevent corrosion do not use sodium hypochlorite chlorine bleach on the stainless steel surfaces Use a clean cloth for cleaning 1 Exterior Wipe the exterior occasionally with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt buildup 2 Cabinet Interior Spills...

Page 38: ...pped Leave the shelves in place so that children may not easily climb inside IMPORTANT When preparing the appliance for long storage clean the cabinet interior door gaskets and shelves See VI A Cleaning for details 1 Before shutting down the appliance move all items into another refrigerator 2 Press and hold the power button for 2 sec to turn off the appliance 3 Unplug the appliance WARNING To red...

Page 39: ...f 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 Refrigerant must be recovered by properly certified service personnel ...

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