Hoshizaki HR24A User's Manual
Contents
1. Lo a E Lo 4 Luo I 4 LL p M Lu LL gt gt lt OJ m 7 med 4 4 _ J X Ww 25 65 Service Diagnosis A 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 Moving parts e g fan blade can crush and cut Keep hands clear Make sure all food zones are clean after the appliance is serviced For cleaning procedures see VI A Cleaning A Diagnostic Procedure The diagnostic procedure is basically a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation and proper voltage per appliance nameplate When checking AC voltage 115VAC always choose a neutral W wire to establish a good neutral connection If the control board is in alarm see Alarm Safeties For further details see IV B Control Board Check e f the control panel is locked press and hold the button and the power button until UnL appears briefly on the display module The F and cabinet tempe2. 12 C Control Board and Display Module e For factory default settings see Service Menu For control board check procedure see 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 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 the back of the control board or display module Do not change wiring and connections Do not misconnect terminals Do not short out power supply to test for voltage Always replace the whole control board and display module assembly if it goes bad 1 Control Board Layout Control Board Power Supply Input 115VAC Compressor 115VAC Ribbon Cable Control Board CONTROL BOARD 4 Cabinet Thermistor Door Switch 5VDC RIBBON CABLE Evaporator Fan Motor 12VDC ITI DISPLAY MODULE Display Module Fig 1 2 Display Module Layout Display Module Cabinet Temperature LEDs Set Power Display
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4. 7 Evaporator Fan Moto 8 Compressor a Compressor external protector open or defective b Motor winding open c PTC relay contacts bad or coil winding open b Defective d Inefficient 11 Refrigerant Refrigerant Lines A a _ _ 31 2 Evaporator is Frozen Up Evaporator is Frozen Up Possible Cause 1 Evaporator a Dirty 2 Evaporator Fan Motor Defective a 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 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 Make sure all food zones in the appliance are clean after the appliance 15 serviced For cleaning procedures see VI A Cleaning A Service for Refrigerant Lines WARNING Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the syste
5. 1 Attach a vacuum pump to the system Be sure the high side charging hose is connected to the field installed high side access valve IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants However the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils 2 Turn on the vacuum pump then open the high side valve on the gauge manifold Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the high side valve on the gauge manifold 34 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 6 A liquid charge is recommended when charging an R 134a system Place the service cylinder on the scales if the service 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
6. 16 We NET T S 17 pP peg Il Pet 18 TUNIS Tene REI e 24 Mz c 24 25 26 leg Sie 26 B onto Board 29 C Thermistor EUR 30 D Diagnostic Chart T p 31 V Replacement of Components 33 A Service for Refrigerant 33 1 Refrigerant Recovery dd 2 PACING EOM 34 3 Evacuation and Recharge H 1948 34 B Important Notes for Component 35 527 MR RE 36 VI Cleaning and Maintenance Instructions 37 ANNO PNE EN UU 37 L EXIETIO TE E 37 2 NR 37 DOOr 2 C NN mm 37 37 einen cade oen 37 VII Preparing the Appliance for Periods of 38 to TED 39 Important Safety Information Throughout this manual notices appear to bring your attention to situations which could result in death
7. Unit Factory Setting Description hrs Defrost interval defrost 91 2 2 Defrost type Do not adjust O electric heater 1 hot gas 2 off cycle evaporator fan motor Limit for defrost P3 1 or 2 o o 99 Defrost on startup Do not adjust 1 yes Minimum time between startup and defrost Do not adjust Temperature display during defrost Do not adjust temperature 1 cabinet temperature or setpoint differential 4 F Based on cabinet temperature at defrost initiation Drip time Do not adjust Hl il ba 1 5 min Do not adjust Do not adjust Do not adjust Do not adjust A 30 32 27 30 1 Do not adjust 0 Do not adjust Minimum compressor run time before defrost if d1 1 Do not adjust 240 3 min 30 ___0 ___ Defrost initiation Do not adjust 0 00 defrost timer is cumulative power on time 1 d0 defrost timer is cumulative compressor run time 2 defrost starts when evaporator temperature lt d9 for time 40 3 based on evaporator temperature when evaporator thermistor is present 82 O O Ep 0 80 po ____ ___ 20 Temperature Alarm Do Not Adjust Unit Factory Setting AL alarm sensor Do not adjust O cabinet thermistor AL alarm Do not aduse O deactivated 1 1 relative to setpoint setpoint A1 2 absolute AL occurs at temperature 1 AH alarm Do not O deactivated
8. button once LS is displayed 3 Press the P button The alarm code is displayed 4 Press the P button again and the alarm details are displayed in 2 second increments Alarm code XX F The highest or lowest temperature during the alarm dur Alarm duration h01 Hours alarm has been engaged n15 Minutes alarm has been engaged continuance of h01 To review press the P button again To exit press the on off button twice After pressing the on off button the first time LS is displayed After pressing the on off button the second time the display returns to the alarm code display 17 b Clearing High and Low Temperature Alarms To clear an alarm follow the steps below 1 Press the button for sec to enter the alarm menu EnS is displayed 2 Press the button twice After pressing the or button the first time LS is displayed After pressing the or button the second time rLS is displayed 3 Once rLS is displayed press the P button 4 Using the or button set the display to 149 5 Press the P button The display flashes for 4 sec The alarm and display module are now deleted and clear The control board returns to normal operation Note If the cabinet temperature is out of acceptable range the procedures above only change the alarm icon A from flashing to steady for 15 minutes Once the temperature is in acceptable range the alarm clears from
9. Button Button Button Button Alarm Icon F LED Compressor Icon Defrost Icon Fig 2 Evaporator Fan Motor Icon 14 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 a Adjusting the Temperature Setpoint The CT setpoint is adjustable between 34 F and 52 F Follow the directions below to adjust the CT setpoint 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 1 Press and hold the P button until 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 min DT starts If Comp run time lt 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and 30 min DT starts During defrost the defrost icon stays o
10. 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 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 every 6 hours Cabinet temperature is displayed during defrost 1 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 2 Cool Down EvapFM icon is on and Comp icon turns steady EvapFM continues 2 min Comp delay timer terminates Comp energizes and 3 min Comp run timer starts 3 Cool Down Achieved EvapFM 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 10 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 30 min DT starts If Co
11. appliance is equipped with a NEMA 5 15 three prong grounding plug to reduce the risk of potential shock hazards It must be plugged into a properly grounded independent 3 prong wall outlet If the outlet is a 2 prong outlet it is your personal responsibility to have a qualified electrician replace it with a properly grounded independent 3 prong wall outlet Do not remove the ground prong from the power cord and do not use an adapter plug Do not use an extension cord To reduce the risk of electric shock turn off the appliance before unplugging To reduce the risk of electric shock do not touch the plug with damp hands Do not use an appliance with a damaged power cord The power cord should not be altered jerked bundled weighed down pinched or tangled Such actions could result in electric shock or fire To unplug the appliance be sure to pull the plug not the cord and do not jerk the cord Do not make any alterations to the appliance Alterations could result in electric shock injury fire or damage to the appliance A 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 Children should be properly supervised around this appliance D
12. 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 8 Cool Down EvapFM icon is on and Comp icon turns steady EvapFM continues 2 min Comp delay timer terminates Comp energizes and 3 min Comp run timer starts Diagnosis Confirm CTh is at least 4 F above setpoint Next check that Comp energizes If not check CB Comp connector for 115VAC If 115VAC is not present confirm CTh status See IV C Thermistor Check If CTh is in range and 115VAC is not present replace CB If 115VAC is present and Comp is off check Comp wire harness connections Next check Comp external protector integrated with start relay Comp start components and Comp motor winding continuity If Comp energizes and the cabinet does not cool down check for air leaks around the door gasket a restriction in the refrigeration circuit or refrigerant leak 9 Cool Down Achieved EvapFM 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 Di
13. plastic surfaces do not use the following thinner benzine alcohol petroleum soap powder polishing powder alkaline cleaner acid scouring 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 should be wiped up promptly to avoid unpleasant odors The cabinet interior should be cleaned periodically with a mild soap or detergent and warm water 3 Door Gasket Door gasket should be cleaned regularly with mild soap and warm water to remove dirt and grease 4 Shelves Remove and clean regularly B Maintenance 1 Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the condenser as required 2 Power Supply Connection If the plug or power cord is damaged replace it Be sure to connect the ground wire 37 Vil Preparing the Appliance for Periods of Non Use When shutting down the appliance for more than one week follow the instructions below A 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 no
14. 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 Pri the alarm icon turns on and the alarm code alternates with the cabinet temperature If the Pri alarm occurs only and the alarm icon A are displayed Alarm Signals Alarm Code Corrective Action Reset Details High Temperature Alarm If obvious corrections such as closing the door and cleaning the condenser do not bring temperature Cabinet temperature has exceeded the back in range see IV Service Diagnosis setpoint temperature by 10 F for more than 2 hours Automatically resets when temperature returns to normal Alarm icon flashes until reset manually Low Temperature Alarm If obvious corrections do not bring the temperature back in range see IV Service Diagnosis Cabinet temperature has remained below the setpoint temperature by 10 F for more Automatically resets when temperature returns to than 2 hours normal Alarm icon flashes until reset manually Close the door Cabinet Thermistor Malfunction Alarm Compressor and evaporator fan motor cycle 10 min on 10 min off Cabinet thermistor has failed a High and Low Temperature Alarm Values AH or AL If an AH or AL alarm occurs follow the steps below to acquire alarm details 1 Press the button for 3 sec to enter the alarm menu 5 is displayed 2 Press the
15. serious injury damage to the appliance or damage to property WARNING Indicates a hazardous situation which could result in death or serious injury NOTICE Indicates a situation which could result in damage to the appliance or property IMPORTANT Indicates important information about the use and care of the appliance A WARNING This appliance should be destined only to the use for which it has been expressly conceived Any other use should be considered improper and therefore dangerous The manufacturer cannot be held responsible for injury or damage resulting from improper incorrect and unreasonable use Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following Only qualified service technicians should install and service this appliance This appliance must be installed in accordance with applicable national state and local codes and 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
16. 1 A4 relative to setpoint setpoint A4 2 absolute AH occurs at temperature A4 Delay for AL or AH alarm to occur after temperature is below A1 or above A4 Do not adjust 240 delay after door switch closes Do not adjust 240 min 15 AH delay after door switch opens Do not adjust 15 C F A1 and A4 temperature differential Do not adjust 21 Evaporator Fan Motor Do Not Factory Settna Fan operation with door closed Do not adjust O off 1 see also 13 F14 and 10 2 parallel with compressor 3 dependent on 1 4 disabled when compressor is off dependent F1 when compressor is on Fan dude defrost Do not adjust Ozdisabled 1 enabled 2 dependent on FO Maximum fan off time when defrost thermistor used C F Fan on temperature when defrost thermistor used a everest Energy saving evaporator fan motor delay after compressor shuts off Energy saving evaporator fan motor off time Energy saving evaporator fan motor on time mma Switch and Door Alarm Do sto Seng Unit Door switch function 1 compressor and evaporator fan motor de energized 2 evaporator fan motor de energized 3 5 reserved Door switch operation open 1 normally closed 120 Door alarm time delay 1 deactivated Evaporator fan motor off time when door is open 1 until door switch engaged Sav
17. 30 min If not allow 30 min DT to terminate Confirm CTh is 4 F above setpoint After 30 min DT terminates does Comp icon turns on and Comp energize If not replace CB Legend CB control board Comp compressor CT cabinet temperature DM display module DS door switch DT defrost timer EvapFM evaporator fan motor C Thermistor Check The cabinet thermistor is used for cabinet temperature control Thermistor 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 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 then unplug the appliance 2 Remove the evaporator shroud 3 Disconnect and remove the evaporator thermistor 4 Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 min 5 Check the resistance between the wires at the thermistor connector Normal reading is within 14 0 to 19 0 If outside the normal reading replace the thermistor 6 Reconnect and replace the thermistor in its correct position 7 Replace the evaporator shroud in its correct position 8 Plug the appliance back in Press the power button for 2 sec to turn the appliance on 30 D Diagnostic Chart Bef
18. Hoshizaki America Inc Undercounter Refrigerator Model HR24A SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73187 Issued 12 7 2011 A WARNING Only qualified service technicians should install and service the appliance To obtain the name and phone number of your local Hoshizaki Certified Service Representative visit www hoshizaki com No service should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage Proper installation is the responsibility of the installer Product failure or property damage due to improper installation 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 1056 770 487 3360 E mail techsupport hoshizaki com HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication
19. MUST include the following information Model Number Serial Number Complete and detailed explanation of the problem 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 5 l PS NUS ce EOS 7 A Electrical and Refrigerant Data B Storage Capacity and Dimensions 7 1 St rage CAC NY cm 7 2 DIMENSION 8 ll General 9 tnt ee 9 B Sequence of Operation 10 1 Sequence Cycles and Shutdown 10 2 Sequence T em 12 C Control Board and Display 2 13 T Copirol Board er 14 2 Display Module Layout METH 14 D Cabinet Temperate E E AEE 15 E Display Mod le eee RAE DU Mn 16 Pe Panel sis 510
20. agnosis 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 replace CB 10 Cool Down Restart EvapFM icon is on CTh warms to 4 F above setpoint default 39 F Comp icon turns on and Comp energizes 3 min Comp run timer starts Diagnosis See step 8 above 11 Defrost EvapFM and Defrost icons are on Cabinet Temperature is Displayed a Automatic Defrost Initiation 6 hr DT terminates 30 min DT starts EvapFM continues If Comp run time 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and defrost starts Diagnosis Has 6 hr DT terminated If defrost icon is on confirm that Comp de energizes If not confirm Comp run time 3 min If Comp continues after 3 min Comp run timer terminates replace CB b Manual Defrost Initiation To initiate a manual defrost press and hold the button until the defrost icon turns 30 min DT starts EvapFM continues If Comp run time 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and defrost starts Diagnosis If defrost icon is on confirm that Comp de energizes If not confirm Comp run time gt 3 min If Comp continues after 3 min Comp run timer terminates replace CB 27 c Defrost Termin
21. ammable 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 134 can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous Do not use silver alloy or copper alloy containing arsenic 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 not use R 134a as a mixture with pressurized air for leak testing 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG NOTICE Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow 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 not use R 134a as a mixture with pressurized air for leak testing 3 Evacuation and Recharge R 134a
22. 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 activation lever and DS continuity Note DS contacts are open when DS is engaged door closed 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 10 Defrost This appliance defrosts every 6 hrs for 30 min Defrost is an off cycle defrost a Manual Defrost Initiation To initiate a manual defrost press and hold the button until the defrost icon turns on 30 min DT starts EvapFM continues If Comp run time 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and 30 min DT starts Diagnosis If defrost icon is on confirm that Comp de energizes If not confirm Comp run time 3 min If Comp continues after 3 min Comp run timer terminates replace CB 29 b 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 Diagnosis Has appliance been in defrost for
23. ation Comp icon is on EvapFM icon flashing 30 min DT terminates 6 hr DT starts Comp icon turns on and Comp energizes 2 min 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 Diagnosis Has appliance been in defrost for 30 min If not allow 30 min DT to terminate Confirm CTh is 4 F above setpoint After 30 min DT terminates does Comp icon turn on and Comp energize If not replace CB If 30 min DT terminates and Comp icon turns on but Comp does not energize check CB Comp connector for 115VAC 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 after CTh has achieved setpoint for ESM to initiate Once 20 min ESM timer terminates EvapFM operates on ESM cycle Diagnosis Confirm 20 min ESM timer terminates Check that EvapFM cycles off with Comp and operates 1 min on and 5 min off when Comp is de energized If not replace CB Legend CB control board Comp compressor CT cabinet temperature DM display module DS door switch DT defrost
24. dle to the right side of the door Place the plugs in the open handle holes on the left side of the door and in the hinge hole on the right side of the door 10 Place the door onto the lower hinge then place the upper hinge in the door and secure to the left side of the appliance 11 Make sure the door is level If not adjust the door using the slots in the hinges 12 Check that the wiring is connected and routed properly then replace the top panel in its correct position Secure the top panel Plastic Plugs Top Panel Top Panel Bracket Upper Hinge Control Panel Handle Door Switch Lower Hinge a Fig 1 Plastic Plugs 36 VI Cleaning and Maintenance Instructions A Cleaning A 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 Do not splash water directly onto the appliance This might cause short circuit electric shock corrosion or failure Before using a sanitizer such as inert soap and sodium hypochlorite chlorine bleach thoroughly read the manufacturer s instructions on its proper usage IMPORTANT To prevent damage to the
25. e Menu 7 Press the and buttons for 4 sec to exit the service menu or do not operate the display for 60 sec Display automatically switches back to normal operating mode and saves changes after 60 sec of inactivity 18 b Service Menu Chart Service Menu Min Unit Factory Setting Description r1 See r2 C F 39 F Cabinet setpoint compressor off temperature see rO for compressor on temperature Thermistor Input Do Not Adjust Service Menu Mim Mex Wn Factory Setting aj aper 0 Cabinet thermistor temperature offset 25 C F Evaporator thermistor temperature offset Decimal point for C display 1 yes Evaporator thermistor connected 1 defrost evaporator fan 2 defrost Operation Do Not Adjust Max Unit Factory Setting Temperature differential above setpoint for the compressor to turn on 2 34 F Minimum cabinet setpoint 89 Maximum cabinet setpoint Compressor Protection Do Not Adjust Unit Factory Setting 240 min 2 Compressor delay at startup and after power interruption 240 min 5 Minimum time between compressor starts min 0 8 Minimum compressor off time s 389 compressor un tme Compressor off time with defective cabinet thermistor Compressor on time with defective cabinet thermistor 19 Defrost Do Not Adjust Service Menu
26. e door alarm Energy saving activation After cabinet temperature is reached and door switch remains closed Serial Network Do Not Adjust Service Menu Min Unit Factory Setting 1 247 27 Address not used 0b oP 2 Baud Rate notused iP 2 2 Parity notused 23 Technical Data A Refrigeration Circuit Left Side Perimeter Liquid Line Evaporator Evaporator Fan Motor Compressor Condensate Pan B Wiring Diagram 1 HR24A
27. erant Data See the nameplate for electrical and refrigerant data The nameplate is located inside the cabinet Electrical and Refrigerant Data Design Pressure PSIG Refrigerant 02 AC Supply Voltage Amperes HIGH LOW 134a_ HR24A 115 60 1 360 We reserve the right to make changes in specifications and design without prior notice B Storage Capacity and Dimensions 1 Storage Capacity Storage Capacity Interior Storage Total Shelf Capacity ft Space ft HR24A We reserve the right to make changes in specifications and design without prior notice 2 Dimensions Unit mm in Top View S Front View Side View Additional Dimensions mm in Interior Width Interior Height Interior Depth Door Stay Open Position HR24A 460 18 11 475 18 70 450 330 1772 13 00 616 24 25 We reserve the right to make changes in specifications and design without prior notice General Information A Construction 1 HR24A
28. i Display Module Control Board 25 Door Switch Door Lock Door Evaporator Fan Evaporator Wire Shelves Cabinet Thermistor Evaporator Fan Shroud Door Gasket Compressor Wire Harness M Condensate Drain Line Power Cord Bm M Condensate Drain Pan Hr Drier Capillary Tube Compressor Start Relay 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 cabinet temperature and EvapFM icon turn on and EvapFM starts 2 min Comp delay timer starts Comp icon flashes during the 2 min Comp delay When the 2 min Comp delay timer terminates Comp icon turns steady and Comp starts Note EvapFM de energizes when door is opened There is a Comp delay of 2 min at startup There is a minimum Comp run time of 3 min There is a Comp delay of 2 min after a power interruption Down P Set Power Button Button Button Button F LED Evaporator Fan Motor Icon Cabinet Temperature LEDs H o HE CS Alarm Icon Compressor Icon Defrost Icon a Refrigerator The F and CT LEDs remain on throughout the sequence of operation
29. m if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do not use R 134a as a mixture with pressurized air for leak testing NOTICE Always recover the refrigerant and store 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 sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow 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 1 Refrigerant Recovery No refrigerant access valves are provided on this appliance Using proper refrigerant practices utilize a temporary tap line valve on the high side to recover the refrigerant Store the refrigerant in an approved container Do not discharge the refrigerant into the atmosphere After recovery is complete replace the tap line valve with a proper permanent access valve 33 2 Brazing A WARNING R 134a itself is not fl
30. mp run time lt 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and defrost starts b Manual Defrost Initiation EvapFM and Defrost icons are on To initiate a manual defrost press and hold the button until the defrost icon turns EvapFM continues 30 min DT starts If Comp run time lt 3 min Comp icon and Comp continue until 3 min Comp run timer terminates Once 3 min Comp run timer terminates Comp icon turns off Comp de energizes and 30 min DT starts 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 6 Defrost Termination Comp icon 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 starts DS must remain engaged without activation door open for 20 min after CTh has achieved setpoint for ESM to initiate Once 20 min ESM timer terminates EvapFM operates on ESM cycle See EvapFM ESM Cycle below Note If DS is activated door open before 20 min ESM timer termina
31. n EvapFM runs normally and CT is displayed Defrost lasts for 30 min Legend Comp compressor CT cabinet temperature DM display module DT defrost timer EvapFM evaporator fan motor E Display Module Icons Display module icons inform you of energized components and if the appliance is in alarm Display Module Icons 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 Defrost Appliance is in defrost cycle See II B a 5 Defrost for details Evaporator Fan Motor Evaporator fan motor 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 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 setpoint from being changed inadvertently To lock the control panel press and hold the button and the power button until Loc appears briefly on the display module To unlock the control panel press and hold the button and the power button until UnL appears briefly on the display module 16 G Alarm Safeties The alarms are designed to
32. o not climb stand or hang on the appliance or door or allow children or animals to do so Do not climb into the appliance or allow children or animals to do so Death or serious injury could occur or the appliance could be damaged Be careful not to pinch fingers when opening and closing the door Be careful when opening and closing the door when children are in the area Do not use combustible 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 of obstruction Do not place anything on top of the appliance Blockage of airflow could negatively affect performance and damage the equipment Do not tightly pack the cabinet Allow some space between items to ensure good air flow Also allow space between items and interior surfaces Do not store items near the air outlet They might freeze up and crack or break To prevent deformation or cracks do not spray insecticide onto the plastic parts or let them come into contact with oil To avoid damage to the gasket use only the door handle when opening and closing Specifications A Electrical and Refrig
33. ore consulting the diagnostic charts check the following Check the cabinet temperature setpoint and factory default settings For factory default settings see Cabinet Temperature and Service Menu Make sure the doors are not left open or opened too often and that they are sealing properly Make sure product is not blocking airflow and that the cabinet is not overloaded with warm or hot product Product should be allowed to cool before putting in the appliance Check for correct installation and proper voltage per appliance nameplate This appliance is approved for indoor or outdoor use Normal operating ambient temperature should be within 61 F to 95 F 16 C to 35 C The appliance should not be located next to ovens grills or other high heat producing equipment or exposed to direct sunlight 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 e 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 2 Cord and Plug 3 Wiring a Loose connection or open b Faulty 4 Power Button control board a Turned OFF b Defective 5 Control Board and Display Module a In alarm See 11 6 Alarm Safeties and IV B Control Board Check Door Switch sere ea
34. rature 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 between starting the appliance and the first defrost After the first defrost defrost can be monitored for activation every 6 hours Cabinet temperature is displayed during defrost 1 Press and hold the power button for 2 sec to turn off the appliance 3 Remove the top panel Secure the top panel to prevent it from falling over when checking voltages and CB items 4 Secure tape DS in the door closed position 5 Plug the appliance back into the electrical outlet F LED turns on Diagnosis Confirm that F LED is on If not check CB POWER connector for 115VAC If 115VAC is not present check power supply and power cord connection If 115VAC is present and F LED is not on replace CB 6 Press the power button for 2 sec to turn on the appliance 2 Unplug the appliance from the electrical outlet 26 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
35. refrigerant access valve if applicable Disconnect the gauge manifold hose 9 Cap the access valve to prevent a possible leak B Important Notes for Component Replacement NOTICE When replacing a component listed below see the notes to help ensure proper operation Compressor Install a new PTC relay WARNING To reduce the risk of electric shock be sure to reconnect the component s ground wire 35 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 Secure the top panel so that it does not interfere with the upper hinge or top panel bracket and will not fall 3 While maintaining a hold on the door remove the fasteners securing the upper hinge to the right side of the appliance Lift off the door and upper hinge 4 Remove the top panel bracket from the left side of the appliance then secure it to the right side of the appliance 5 Remove the 2 outside plastic plugs from 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 han
36. t 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 reduce the risk of electric shock do not touch the plug with damp hands 38 VIII Disposal A 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 Refrigerant must be recovered by properly certified service personnel 39
37. tes ESM timer resets and 20 min ESM timer re starts once CTh cools to setpoint again EvapFM ESM Cycle f Comp is de energized when 20 min ESM timer terminates de energizes If Comp is energized when 20 min ESM timer terminates EvapFM continues and cycles off with Comp During ESM Comp off time EvapFM operation is 1 min and 5 min off EvapFM operates on and off with Comp Legend CB control board Comp compressor CTh cabinet thermistor CT cabinet temperature DM display module DS door switch DT defrost timer ESM energy saving mode EvapFM evaporator fan motor 11 2 Sequence Flow Chart 02 51581 1504901 Aejdsip y uo suni uoo eui pue sseJd OL e e Aejap dwog e si e uiu Jo euin UNI dwog e SI e dnueis ye uiu 2 ejep dwog si eeu e uado si Joop seziBieue ep Jeuun 3 jeutqeo u 10559 5 go uiu UO uiu duo duJo2 pue uo sezifjeue Aq peuinboi seziGieue Wadena 419 Aq peunbei se yo pue uo
38. the display module and deleted from memory H Service Menu The service menu chart is provided to give information on the operation parameters of this appliance NOTICE Do not adjust Adjustments outside of the factory default settings could adversely affect safety performance component life and warranty 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 display to 19 This is the service menu password 2 Service Menu List 4 Press the P button PA is displayed Press and hold the and buttons until SP is displayed SP is the first level of the service menu SP is working setpoint 5 To view the setting value press the P button To adjust the setting value press the or button To return to the service menu list press the P button This saves the new value and returns you to the service menu list 6 Press the or button to scroll through the service menu list Press the P button to view the selected setting value Press the P button again to save the changes and return to the service menu list 3 Exit Servic
39. timer ESM energy saving mode EvapFM evaporator fan motor 28 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 Startup and Cool Down 1 Press the power button for 2 sec to turn off the appliance 2 Unplug the appliance from the electrical outlet 3 Remove the top panel Check all wiring connections Confirm that the power cord EvapFM Comp DS and CTh are all properly connected to CB and ground connection GND is properly connected to the frame 4 Secure the top panel to prevent it from falling over when checking voltages and CB items 5 Secure tape DS in the door closed position 6 Plug the appliance back in F LED turns on Diagnosis Confirm that F LED is on If not check CB POWER connector for 115VAC If 115VAC is not present check power supply and power cord connection If 115VAC is present and F LED is not on replace CB 7 Press the power button for 2 sec to turn on the appliance 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 icon replace CB 9 If F
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