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1. 3 HUR68A HUF68A Units mm in INTERNAL VOLUME 18 8 FT 142 3 DOOR STOP POSITION 1109 eT 56 DOOR STAY OPEN ANGLE 1052 CLEAR DOOR OPENING MEASURES 554 8W 616 2 220in 24 1442 2 56 8 860 8 22 6 821 9 32 3 gt 760 8 1728 NS 68 2 80 z 570 2 3 22 5 le 375 me m 8 VE 8128 32 3a HUR68A D HUF68A D DRAWER CARTRIDGE SIZED FOR A MAXIMUM OF FOUR 1 1 PANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 mm LENGTH 20 7 8 530 225 mm 604 8 CABINET FRONT E um 5 1 1 SIZE SES m HOTEL PAN 5 4 NIS Six Bl 524 16 9 2087 M TYPICAL HOTEL PAN FOR REFERENCE ONLY 1 11 1 82 7608 3 2 30 821 6542 6542 32 3 ke 7 524 25 8 25 8 55 01 es 5 cem t4 4 5 mim mis M T 4 HWR68A HWF68A 1014 2
2. 440 1 440 2 ues 330 330 Jojeaipu 430 3 4 330 6 N 330 uey 330 105594 4 2 yUIodjas 10514194 19014 jenuejeyiq JUIodjas Jojsiuuau 15604901 uoneuruue 3304 C Control Board A Hoshizaki exclusive solid state control board is employed in all Hoshizaki refrigerators and freezers All models are pretested and factory adjusted CAUTION 1 Fragile handle very carefully 2 The control board contains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the unit when handling or replacing the board Do not touch the electronic devices on the board or the back of the board to prevent damage to the board Do not attempt to repair the board in the field Always replace the whole board assembly if it goes bad Do not short out power supply to test for voltage Keep the thermistor leads clogged filter sensor leads and pressure switch leads at least 1 5 away from high voltage leads AC 100 volts or more to protect against electrical noise 1
3. Units mm in INTERNAL VOLUME 18 8 FT DOOR STOP POSITION 110 1423 DOOR STAY OPEN ANGLE 1059 487 1 55 ma CLEAR DOOR OPENING MEASURES ul 5548 x 616 2H 220in x 2437 38 n S E T 1683 8 226 663 1728 5298 5493 gt 760 8 25 6 25 6 8 68 25 6 959 Nes 30 E T H 5702 225 an EIE 3 T T x 9 0 7 8128 f 0 62 4a HWR68A D HWF68A D CABINET FRONT ois SE 5 4 g ajo 8 al 0 ols 5 lt gt 6542 6542 25 8 25 8 c cm gt mim 6 BEER d DRAWER CARTRIDGE SIZED FOR A MAXIMUM OF FOUR 1 1 PANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 mm LENGTH 20 7 8 530 225 mm 604 8 1 1 SIZE HOTEL PAN 2087 TYPICAL HOTEL FOR REFERENCE ONLY 760 8 G0 821 32 3 2 88 5 HUR96A Units mm in 860 8 1423 187 1 5 9 7 4 ale xn 1 N INTERNAL
4. 40 h Control Board Error Alarms EA and elio 41 B Diagnosis S rcl RM 42 Thermistor Cheese m EU 45 IV Removal and Replacement of Components 46 Service for Refrigerant c 46 1 Refrigerant RECOVETY NI TT 46 2 Brazing UU UU 46 3 Eva c ation and re 47 B Removal and Replacement of Refrigeration 48 C Removal and Replacement of Compressor 48 D Removal and Replacement of 49 E Removal and Replacement of Capillary Tube Suction Line Assembly 51 F Removal and Replacement of Thermistors 52 Removal and Replacement of Door Gasket 53 Removal and Replacement of Defrost ne 53 Removal and Replacement of Control 54 J Removal and Replacement of Fan anpra on 55 Door Re Hinging and Drawer Conversion 04004400 0 55 V Cleaning and Maintenance 56 aR 56 57 UM II
5. a defrost Use gloves when handling and avoid touching the glass directly Also prevent heaters from touching other parts 6 Remove the eight 4x8 T2 screws attaching the shroud to the evaporator unit and remove the shroud Remove the defrost thermistor if necessary to remove the shroud 7 Remove the four 4x12 T2 evaporator fan motor attachment screws and remove the evaporator fan motor 8 Install the new fan motor and return the refrigeration unit to its proper position in the reverse order of the removal procedure 9 Plug in the unit and turn on the power supply K Door Re Hinging and Drawer Conversion Contact your local Hoshizaki distributor or Hoshizaki Technical Support 1 800 233 1940 if door reversing or drawer conversion is desired 55 V Cleaning and Maintenance Instructions WARNING 1 Do not splash water directly onto the unit This might cause short circuit electric shock corrosion or failure 2 When cleaning or inspecting the unit turn off the power switch and unplug the unit or disconnect the main power source to prevent electric shock by unexpected entrance of water into the unit or injury by any moving parts 3 To prevent frostbite do not touch foods or containers especially metallic in the freezer compartment with damp hands 4 Before using a sanitizer such as inert soap and sodium hypochlorite thoroughly read the manufacturer s instructions on the proper usage and amount IMPORTANT
6. 10 SM ulis E 11 NR 11 Il General Information 12 tcc 12 B Sequence of Operation and Timing 5 1 1 Refrigerators Continuous Operating Mode 13 2 Freezers Continuous Operating Mode aree ctn ne 15 3 Refrigerators Energy Saving Operating 17 4 Freezers Energy Saving Operating Mode 19 C als 21 12212 0 00 8 E 21 Board M 22 and 23 1 Gaining Access to Settings and 2 23 2 lemperatur Display cede 24 a Switching the Display Between Fahrenheit and Celsius F5 24 b Adjusting the Setpoint Temperature 24 Cabinet Temperature Correction calibration 25 3 Settings and Diagnostics Menu d 26 a Delrgst Interval BO 62626000 27 b Defrost Termination Te
7. both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 6 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete 30 h Compressor Time F7 To display the compressor run time between the two most recent defrosts follow the steps below 1 Make sure the jumper is removed between the connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this feature 2 Press and hold both the button and the unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F7 appears in the display window 3 Press the 9 unmarked blank button to display the run time The number displayed indicates what percent of the time the compressor was running 4 Press the MANUAL DEFROST button to return to the menu screen Press and hold both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 5 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete 4 Operating Modes Hoshizaki undercounters and worktops feature two operating modes energy saving and continuous Always use the default setting of your unit To determine the default setting of your unit see
8. 1 To prevent damage to the painted or 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 a chlorine bleach such as sodium hypochlorite on the stainless steel surfaces Use clean cloth and hands for cleaning Before cleaning the cabinet interior move the stored foods into another clean refrigerator freezer A Cleaning 1 Stainless Steel Exterior Wipe the exterior occasionally with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up 2 Stainless Steel Interior Spills should be wiped up promptly to avoid unpleasant odors The cabinet interior should be cleaned periodically with a mild soap or detergent 3 Gaskets Gaskets should be cleaned regularly with mild soap and water to remove dirt and grease 4 Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the unit as required 56 5 Air Filter As the air filter becomes clogged with dirt or dust the unit s performance will be reduced Do not operate the unit with the air filter removed This will accelerate clogging of the condenser and result in failure Check the filter at least twice each month If it is dirty use warm water and a neutral cleaner to wash the filter To
9. 404 or R 134a as a mixture with pressurized air for leak testing 12 Insulate the entire suction line between the compressor and evaporator case 13 Evacuate the system and charge it with refrigerant see the nameplate for the required refrigerant charge 14 Return the refrigeration unit to its proper position in the reverse order of the removal procedure 15 Plug in the unit and turn on the power supply 51 F Removal and Replacement of Thermistors 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration system Support the evaporator as it clears the evaporator case For the remainder of the procedure see the appropriate section below Cabinet Thermistor 5 Cut the cable tie holding the cabinet thermistor to the bracket attached to the fan motor side of the evaporator shroud Remove the thermistor 6 Remove the thermistor wire connection below the control box 7 Install the new thermistor and return the refrigeration unit to its proper position in the reverse order of the removal procedure 8 Plug in the unit and turn on the power supply Defrost Thermistor 5 The defrost thermistor element is secured to the top of the evaporator with aluminum tape and the wire i
10. amp 2 Compressor will not run draws b Start Relay UR Compressor runs a Voltage and Refrigerant Line or 1 Plugged or restricted 1 Clean and replace drier Clean Component and replace capillary tube heat exchanger assembly d Condenser Fan Motor 1 Failed 1 Replace e Refrigerant 1 Overcharged 1 Evacuate and recharge system condenser ventilation Cabinet temperature too high compressor Control Board 1 Defective 1 Replace will not start 42 Possible Cause 5 Cabinet a Setpoint and or 1 Incorrect 1 Correct setting s temperature too Differential See sections II D 2 b and high 11 0 3 for defaults b Door 1 Not sealing opened Check for sealing check for frequently or open for door open at time of warm long intervals cabinet temperature Defrost Defrost time See 8 Evaporator does insufficient to remove not defrost completely frost Operation in humid conditions source interior or redistributing food product setpoint temperature 6 Cabinet a Power Supply 1 Mave to ON position display 3 Failure or Tipped 3 Call electrician and or reset indicator does breaker breaker not illuminate b Control Board 1 Defective 1 Replace properly Cabinet a Setpoint and or 1 Incorrect 1 Correct setting s temperature too Differential See sections Il D 2 b a
11. see D 2 a Switching the Display Between Fahrenheit and Celsius F5 g Alarm History F6 To view the alarm history follow the steps below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Diagnostics 2 Press and hold both the button and the unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F6 appears in the display window 3 Press the unmarked blank button to display the alarm history The alarms will be displayed in reverse chronological order newest to oldest up to 8 alarms When is displayed you have reached the end of the alarm history and the display will begin again Note The alarms are as follows Alarm Code Description __ __ High Temperature Alarm 22 Low Temperature Alarm Defrost Alarm 0 High Pressure Alarm Clogged Filter Alarm Defrost Temperature Sensor Malfunction Alarm Clogged Filter Sensor Malfunction Alarm EEPROM Write Error Alarm ED EEPROM Verification or Read Error Alarm E1 E2 E3 4 7 E8 E9 EA ED 4 To reset the alarm history press and hold both the e unmarked blank button and the MANUAL DEFROST button for 5 seconds 5 Press the MANUAL DEFROST button to return to the menu screen Press and hold
12. 4x8 T2 screws attaching the shrouds to the evaporator unit and remove the shrouds Remove the defrost thermistor if necessary to remove the shrouds 10 Remove the evaporator and drier 11 Place the new evaporator and new drier in position 12 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION 1 Care must be taken to ensure that the capillary tube is not blocked or contaminated during this process 2 Ensure that the capillary tube extends inside the mating tubing 1 to 1 3 8 25 to 35 mm 13 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 404A or R 134a as a mixture with pressurized air for leak testing 14 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 15 Replace the removed parts in the reverse order of which they were removed 16 Replace the front panel and all other guards in their correct positions 17 Plug in the unit and turn on the power supply 50 E Removal and Replacement of Capillary Tube Suction Line Assembly IMPORTANT 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
13. Filter Sensor orange Defrost Thermistor black Cabinet Thermistor ___ white Jumper Wire limits access to settings and diagnostics menu not present on all units light blue High Pressure Switch N A 22 D Settings and Diagnostics Various settings and diagnostic information can be controlled via the display panel The display panel is located behind the front panel To open the front panel grip the outer edge of the panel near the top and bottom and pull it open This permits access to the display panel and control box The unit has a 2 minute startup delay To bypass the startup delay move the power switch to the OFF position Then press and hold the up arrow key while moving the power switch to the ON position Follow the instructions and warnings below and on the display panel for safe and efficient operation of the unit 1 Gaining Access to Settings and Diagnostics Generally the only two settings that can change are the temperature display scale F C and the temperature setpoint The restriction to these two settings is achieved by the presence of a jumper between connector K151 pins 7 and 8 on the control board To access other settings the jumper must be removed To see if the jumper is present press and hold both the button and the unmarked blank button for 5 seconds If F5 appears in the display window the jumper is present and must be removed in order
14. If this alarm occurs frequently the compressor discharge temperature is consistently too high Note f the unit is turned off and then back on while the alarm code is displayed the alarm may be reset even if the filter is not yet clean However the alarm will recur once the compressor discharge temperature reaches 136 4 F 58 C Timer Start 2 min High Clogged Filter Alarm Reset Clogged Filter Alarm Temperature 136 4 F 58 C Low Cabinet Temperature Display E7 Blinking 38 f Defrost Temperature Sensor Malfunction Alarm E8 If input from the defrost thermistor is below the defrost open circuit detection point equivalent to 67 F 55 C is displayed 8 is also displayed when input from the defrost thermistor is above the defrost thermistor short circuit detection point equivalent to 122 F 50 for 10 minutes or more Note f this alarm appears first make sure that the sensor is properly connected A short circuit will not be detected during the first hour after power is turned on However a short circuit can be detected immediately by turning on the power while pressing the button In this case E8 will be displayed immediately if a short circuit is detected A short circuit will not be detected during defrost or fan delay Reset Options The alarm automatically resets when one of the following conditions is met The input from the defrost thermist
15. Operation Cycle Off Cut out temperature reached 2 minute Delay Minimum 2 minutes 1 Compressor start up 1 Compressor off 2 Condenser fan start up 2 Condenser fan off 3 Frame heater s on 3 Frame heater s continuously cycle on and off 4 Evaporator fan s on Q6 and later continuously 4 Evaporator fan s cycles on and off Board Self Check 1 Frame heater s on continuously Q5 and earlier Frame heater s cycle on and off Q6 and later 2 Evaporator fan s cycles on and off Cycle On Cut on temperature reached Defrost End Minimum 2 minutes Defrost thermistor 1 Compressor start up reaches defrost 2 Condenser fan start up Defrost Start termination temperature 3 Frame heater s on Preprogrammed time interval or defrost timer reaches continuously 1 Compressor off 1 hour 4 Evaporator fan s on 2 Frame heater s off Q6 and later Defrost heater off continuously 3 Evaporator fan s off 4 Condenser fan off 5 Defrost heater on Continue as 6 dF displayed normal cycling Five minutes after Five minutes after One minute after evaporator defrost heater off compressor start up fan start up dF no longer 1 Compressor on 1 Evaporator fan s on displayed cabinet temperature 2 Condenser fan on 2 Frame heater s displayed on Q6 and later Note 1 Cut on cut off and cabinet temperature are read by the same sensor called the cabinet thermistor 2 The defrost thermistor reads the ev
16. Start Up Delay The start circuit of the compressor is timed such that at power up and during any compressor off time there will be at least a 2 minute delay before the compressor will start This delay is controlled through the control board To bypass the startup delay move the power switch to the OFF position Then press and hold the up arrow key while moving the power switch to the ON position Note The compressor must run a minimum of three minutes during each run cycle 21 2 Control Board Layout Rear Front K311 6 pin SW 135 SW 134 SW 133 Relay Wiring Tees Part Display Raise Lower Harness Setpoint Setpoint Setpoint LED 123 Lit for Negative Values Board Part Number SW 132 Manual hib Revisi Chip Revision Defrost K251 5 pin not used LED 124 SW 131 Temperature Energy Saving K101 3 pin Display 21 Transformer Butt utton K151 10 pin Thermistor Wiring Harness Relays F101 K361 9 pin Fuse used Note Fuse at position F101 on board is not currently used The board can function without this fuse Relay Wiring Harness K311 Z brown Compressor Relay 654321 T T x red Evaporator Fan Relay orange Defrost Heater Relay Thermistor Wiring Harness K151 gray Clogged
17. below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Diagnostics 2 Press and hold both the button and the unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F2 appears in the display window 3 Press the e unmarked blank button to display the current setting the decimal between the digits is not shown Press the down button to increase decrease the plus differential in 9 F increments Note Both the and values can be adjusted between 0 0 and 6 3 F in 9 F increments 0 0 to 3 5 C in 5 C increments You cannot set both and to 0 0 4 Press the Q unmarked blank button to save the setting and move to the minus differential setting 5 Press the down button to increase decrease the minus differential in 9F increments Note Both values can be adjusted between 0 0 and 6 3 F in 9 F increments 0 0 to 3 5 C in 5 C increments You cannot set both and to 0 0 6 Press the e unmarked blank button to save the minus setting The minus sign will turn off and the display will change to the plus differential setting 7 Press the MANUAL DEFROST button to return to the menu screen Press and hold
18. both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 8 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete 28 d High Temperature Alarm Delay Time To change the high temperature alarm delay time follow the steps below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Diagnostics 2 Press and hold both the button and the Q unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F3 appears in the display window 3 Press the unmarked blank button to display the current setting Press the down button to increase or decrease the high temperature alarm delay time Note The time can be adjusted between 0 and 180 minutes in 60 minute increments The display corresponds to time as follows Display Detection Time 2 10 3 18 4 Press the unmarked blank button to save the setting 5 Press the MANUAL DEFROST button to return to the menu screen Press and hold both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 6 If a
19. on the drier in the direction of the refrigerant flow 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration system Support the evaporator as it clears the evaporator case 5 Recover the refrigerant and store it in an approved container 6 Remove the insulation on the suction line 7 Remove the four 4x8 T2 screws holding the evaporator to the evaporator bracket and provide a safe means for supporting the evaporator away from the ABS liner of the evaporator case cover Protect any wiring from damage due to the brazing torch 8 Remove the capillary tube suction line assembly and drier 9 Place the new capillary tube suction line assembly and new drier in position 10 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 psig CAUTION 1 Care must be taken to ensure that the capillary tube is not blocked or contaminated during this process 2 Ensure that the capillary tube extends inside the mating tubing 1 to 1 3 8 25 to 35 mm 11 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
20. the chart below __________ Default Setting Refrigerator auxiliary code Q5 and earlier Continuous Operating Mode Refrigerator auxiliary code Q6 and later Energy Saving Operating Mode Continuous Operating Mode Energy Saving Operating Mode To determine the operating mode your unit is in look at the unit s cabinet temperature display If a period does not appear after the temperature the unit is in continuous operating mode If a period appears after the temperature the unit is in energy saving operating mode To switch between operating modes press and hold the e unmarked blank button for 5 seconds Note It takes 5 seconds for this setting to be saved Once saved the setting you made will be remembered even if the power is turned off Continuous Energy Saving no period after temperature period after temperature 31 a Continuous The evaporator fan runs constantly except in defrost The frame heaters are on continuously b Energy Saving The evaporator fan runs when the compressor is on but only intermittently when the compressor is off The frame heaters cycle on and off with the evaporator fan for refrigerators auxiliary code Q6 and later but are on continuously for refrigerators auxiliary code Q5 and earlier and all freezers Intermittent fan operation saves energy by reducing heat leak especially around the gasket and by extending compressor off time Fan on off time is dependent on the setpoi
21. the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration system Support the evaporator as it clears the evaporator case 5 Remove the connection lead wire for the defrost heater 6 Remove the two 4x8 T2 evaporator shroud screws above each end of the defrost heater 7 Carefully remove the defrost heater by twisting the ends together and removing the ends from the slots in the shroud 8 Return the refrigeration unit to its proper position in the reverse order of the removal procedure 9 Plug in the unit and turn on the power supply CAUTION Be careful when handling both the old and new defrost heaters The heaters are sheathed in glass tubes and can possibly cause cuts if broken Heater will also be hot after a defrost Use gloves when handling Avoid touching the glass directly hold the heaters by the ends 53 Removal and Replacement of Control Board IMPORTANT When receiving a service call please ask the customer to turn the power off then turn it back on and monitor the condition for awhile Even if the control board malfunctions for some reason it may resume normal operation after the power is turned off once CAUTION 1 Fragile handle very carefully 2 The control board c
22. to access other settings If FO is displayed no jumper is present and all settings are unrestricted and accessible See the rest of this section for details about each setting Note If there is no input for 60 seconds the display will revert to normal TEMPERATURE SETTING Push SET Point Button to display the current set point temperature e Hold down SET Point Button and press Temperature Control Button or Y until Temperature Display TEMP CONTROL Window shows the desired temperature setting buttons temperature TEMP display window blank button DEFROST MDEFROST e Temperature Display Window shows during defrost cycle MANUAL DEFROST Hold down Manual Defrost Button for 5 seconds to start defrost cycle CODE DISPLAY MANUAL e Temperature Display Window flashes alternately between one of the error codes from E1 to E9 and cabinet temperature in case of trouble D E F RO ST E1 Cabinet temperature too high button Doar s left open Warm or hot foods inside Installed near high heat producing equipment E7 Condenser clogged or ambient temperature too high Air Filter clogged Installed near high heat producing equipment an eror code other than or E7 is displayed contact an authorized Hoshizaki service company EHOW ERROR CODE E1 Automatically resets when a proper cabinet temperature is resumed E7 Afte
23. to make sure that the switches and buttons line up appropriately on the display panel and that they operate 12 Replace all panels and guards 13 Plug in the unit and turn on the power supply 54 4 Removal and Replacement of Fan Motors 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration system Support the evaporator as it clears the evaporator case For the remainder of the procedure see the appropriate section below Condenser Fan Motor 5 Disconnect the lead wire to the condenser fan motor 6 Remove the two 5x10 condenser fan motor bracket attachment bolts and remove the condenser fan motor assembly 7 Remove the fan motor from the attachment base and remove the fan blade from the fan motor 8 Install the new fan motor and return the refrigeration unit to its proper position in the reverse order of the removal procedure 9 Plug in the unit and turn on the power supply Evaporator Fan Motor 5 Disconnect the lead wire to the evaporator fan motor CAUTION Be careful when handling the evaporator shroud assembly This assembly includes a defrost heater sheathed in a glass tube This sheathing can be easily damaged and may also cause cuts if broken Heater will also be hot after
24. 04 113 122 15 10 5 0 5 10 15 20 25 30 35 40 45 50 Temperature F 40 22 4 14 32 50 68 86 40 30 20 10 0 10 20 30 Temperature To check a thermistor s resistance follow the steps below 1 Disconnect the connector for the thermistor in question under the control box and behind the wire guard 2 Remove the thermistor See IV F Removal and Replacement of Thermistors 3 Immerse the thermistor sensor portion in a glass or cup containing ice and water for 2 or 3 minutes 4 Check for a resistance between thermistor leads Normal reading is from 5 to 6 5kO for the cabinet and defrost thermistors 145 to 175 for the clogged filter sensor Replace the thermistor if it exceeds the normal reading 45 IV Removal and Replacement of Components IMPORTANT 1 Ensure all components fasteners and thumbscrews are securely in place after the equipment is serviced 2 The Polyol Ester POE oils used in all units can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts 3 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 4 Do not leave the system open for longer than 15 minutes when replacing or servicing parts A Service for Refrigerant Lines WARNING Use an e
25. 24 3in 22 6 821 ER 6495 6495 6495 2 EE 95 8 E 2 25 6 25 6 25 6 80 5702 SS 24 3 22 5 3 em 1 wale i 8 al r 9 9 9 T s Joo 828 5 62 6a HWR96A D DRAWER CARTRIDGE SIZED FOR A MAXIMUM OF FOUR 1 1 PANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 LENGTH 20 7 8 530225 mm 604 8 CABINET FRONT ue 55 11 SIZE e zm 22 5 E HOTEL gt g 4 16 SIN 152 4 AIS 2 5135 Aa 6 2087 20 2 TYPICAL HOTEL FOR REFERENCE ONLY 1 1 82 760 8 G2 80 6542 6542 6542 258 25 8 258 cm 5 ele e E 5 11 Il General Information A Construction Hoshizaki undercounters feature a cartridge type refrigeration unit that can be removed without taking off the top and side panels Front Panel Evaporator Assembly Evaporator Case AT Evaporator Case Cover Control Box Side Panel gt A Access Valve Low Side 2 Compressor Condenser Capillary Tube Suction Condenser Fan Motor Line Assembly Compressor Base Evaporator Case Cover Thermal Fuse Defrost Thermostat Defrost Thermistor Evaporator Shroud Defrost Heater Cabinet Thermistor Evaporato
26. 51 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 61 C2 HUR68A D HWR68A D auxiliary code Q6 and later WIRE COLOR CODE 3 PRONG PLUG N lt 115 60 1 gt x aK LIGHTBLUE WIR Transformer Output 10V at 115V gast CONTROL BOARD 1 Note Jumper color white between pins 7 and 8 of connector 151 not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 62 D HUF68A D HWF68A D 3 PRONG 15 WIRE COLOR CODE CAP PLUG PBR BROWN WHITE 2 BLACK 0 RANGE Wo uu qe BK men epe IP PIN SAM ARKBLUE WR WR 5 REDUNDANT CE VIOLET i es Tw ELLOW Wenn GHTB REDUNDANT d be I lt mii zo gt lt Y 25 Ox 0000 meme TORN Transformer Output 10V at 115V B CONTROL BOARD 1151 5 losl 0 lou o Note Jumper color whi
27. ANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 mm LENGTH 20 7 8 530 225 mm 604 8 1 SIZE 3016 HOTEL PAN 4 16 a 2087 TYPICAL HOTEL FOR REFERENCE ONLY 12 88 82 760 8 G2 30 gt 821 32 3 Te s 524 623 2 1 q 2 HWR40A HWF40A Units mm in INTERNAL VOLUME 8 5 FT 2a HWR40A D HWF40A D 1476 7 58 1 STROKE 304 8 12 0 637 654 2 25 8 CABINET FRONT 4423 DOOR STOP POSITION 110 59 DOOR STAY OPEN ANGLE 1059 CLEAR DOOR OPENING MEASURES als 554 8W x 616 2H 220in 24 31 58 8 AE N Ne N Sy 226 1 821 9 323 6495 9 32 3 Ee 3 25 6 760 8 nig Se 507 Sls 73 1 mn Er 5702 E ale 22 5 lt ale alm d BB 1 1 1 9 2 8128 DRAWER CARTRIDGE SIZED FOR MAXIMUM OF FOUR 1 1 PANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 mm LENGTH 20 7 8 530 225 mm 604 8 1A SIZE HOTEL PAN 4 16 452 4 9 2087 TYPICAL HOTEL 5 FOR REFERENCE ONLY 82 760 8 3 2 30 821 32 3 52 4 24
28. Hoshizaki America Inc Commercial Refrigerators amp Freezers Undercounter amp Worktop Series Models Refrigerators HUR40A D HWR40A D HUR68A D HWR68A D HUR96A D HWR96A D Freezers HUF40A D HWF40A D HUF68A D HWF68A D SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73123 Issued 2 4 2005 Revised 9 30 2008 IMPORTANT Only qualified service technicians should attempt to service or maintain this unit No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the unit Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the Hoshizaki Technical Support Department for assistance HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Phone 1 800 233 1940 Technical Support 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport hoshizaki com Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and detailed explanation of the problem ENERGY STAR Products earning th
29. ROST button to scroll through the menu and the unmarked blank button at any point to view the current setting Press the MANUAL DEFROST button to return to the menu screen Auxiliary Code Q5and Q6and Code Setting and Display Range Defrost Termination Refrigerator 59 to 68 F 15 to 20 C in Temperature one degree increments 59 59 41 Freezer 41 to 68 F 5 to 20 one degree increments F2 Setpoint 0 to 6 3 F in increments of 9 F Temperature 0 to 3 5 C in increments of 5 C 0 2 0 0 2 0 Differential 2 5 C 2 0 C 3 5 C 2 0 C upper and lower decimal decimal decimal decimal is not is not is not is not displayed displayed displayed displayed High Temperature 0 to 180 minutes in 60 minute a Alarm Delay Time 020 1 60 minutes D __ lal NN alarms M E RAE MEM Time recent defrosts NAE d 26 a Defrost Interval This unit is preset at the factory to defrost once every 6 hours for general conditions However if it is determined that this interval does not suit actual conditions the interval can be changed To change the defrost interval follow the steps below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Dia
30. RTANT 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 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 49 4 Very carefully slide out the refrigeration system Support the evaporator as it clears the evaporator case 5 Recover the refrigerant and store it in an approved container 6 Remove the four 4x8 T2 screws holding the evaporator to the evaporator bracket and provide a safe means for supporting the evaporator away from the ABS liner of the evaporator case cover 7 Remove the thermistors and thermal fuse Protect any wiring from damage due to the brazing torch 8 Remove the insulation tubing and disconnect the evaporator inlet and outlet tubing CAUTION Be careful when handling the evaporator shroud assembly This assembly includes a defrost heater sheathed in a glass tube This sheathing can be easily damaged and may also cause cuts if broken Heater will also be hot after a defrost Use gloves when handling and avoid touching the glass directly Also prevent heaters from touching other parts 9 Remove the six
31. VOLUME 29 1 FT DOOR STOP POSITION 110 DOOR STAY OPEN ANGLE 1059 CLEAR DOOR OPENING MEASURES m 554 8W x 616 2H 22 0 243in Ad 226 821 9 32 3 2433 6495 6495 6495 BO 95 8 25 6 25 6 25 9 rp I 74 8 9 8128 82 5a HUR96A D DRAWER CARTRIDGE SIZED FOR A MAXIMUM OF FOUR 1 1 PANS SEE SKETCH BELOW WIDTH 12 7 8 327 025 mm LENGTH 20 7 8 530 225 mm 604 8 CABINET FRONT 19 88 sls A 5 un sm 4A SIZE 25 E MIN mr HOTEL PAN as y oq anja 4 16 RIN BIN ol 5135 152 4 20 2 9 m TYPICAL HOTEL PAN FOR REFERENCE ONLY 82 7608 3 2 30 821 6542 6542 6542 524 323 25 8 25 8 25 8 1 5 3 ls mim 333 13 1 10 6 HWR96A Units mm in Le gy 1423 187 1 5 6 74 qe Ri INTERNAL VOLUME 291 FT DOOR STOP POSITION 110 DOOR STAY OPEN ANGLE 105 CLEAR DOOR OPENING MEASURES 554 8W x 6162H 22 0in x
32. an s 32 Ill Service Diagnosis A Alarm Codes If an error occurs the alarm code and cabinet temperature are displayed in 1 second intervals See the table below for a general description of the problem then see the rest of this section for detailed instructions Alarm Signals AlarmCode Problem Notes 7 High Temperature Alarm Cabinet temperature has exceeded set temperature by 14 4 F 10 C for more than x hours The default value of x is 2 2 hours Low Temperature Alarm Cabinet temperature has remained below setpoint by 9 F 5 C for more than y hours The default value of y is 1 1 hour Defrost Alarm Defrost has taken longer than 1 hour Control board has terminated defrost High Pressure Alarm Compressor discharge pressure is outside normal operating range Pressure switch has been triggered 5 or more times in 1 hour Condenser filter may need cleaning Clogged Filter Alarm Condenser temperature is outside of normal operating range Condenser filter needs cleaning Defrost Temperature Sensor Malfunction Alarm Defrost temperature sensor has failed Clogged Filter Sensor Malfunction Alarm Clogged filter sensor has failed EEPROM Write Error Alarm Control board is defective EEPROM Verification or Read Error Alarm Control board is defective 33 When temperature returns to setpoint range alarm code E1 will clear The value of x can be changed under F3 on th
33. aporator as it clears the evaporator case 5 Recover the refrigerant and store it in an approved container 6 Remove the terminal cover on the compressor and disconnect the compressor wiring 7 Remove the discharge process and suction pipes 8 Remove the hold down bolts washers rubber grommets and sleeves 9 Remove the compressor Unpack the new compressor Attach the rubber grommets and sleeves of the prior compressor 10 Place the new compressor in position and secure it using the bolts and washers 1 Remove the drier then place the new drier in position 12 Remove the plugs from the suction discharge and process pipes 13 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 14 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 404 or R 134a as a mixture with pressurized air for leak testing 15 Evacuate the system and charge it with refrigerant see the nameplate for the required refrigerant charge 16 Connect the terminals then replace the terminal cover in its correct position 17 Return the refrigeration unit to its proper position in the reverse order of the removal procedure 18 Plug in the unit and turn on the power supply D Removal and Replacement of Evaporator IMPO
34. aporator temperature 17 NO uejs Ue pue uaym Aejap meys JojeJode4 e puooes ueis 150494 9 4 Jaye pue 90 pue Aejaq unu uoneung 5 Xen uiui 09 gt 440 40889 4 1 4 09 440 40889 4 ej q juegyiuuoju epquea 440 uw uiu 2 uiu 2 Chart Refrigerators Energy Saving Operating Mode iming b T 330 330 1 60490 330 JojeaH 160 901 330 6 330 uey 330 1055944 2 ienueJeyiq 1uodies 10 51419 1 1015149 1 eunjejeduue 180 90 4 Freezers Energy Saving Operating Mode a Sequence of Operation POWER ON Board Self Check 2 minute Delay Cycle Off Cut out 1 Frame heater s on 1 Compressor start up temperature reached 2 Evaporator fan s 2 Condenser fan start up Minimum 2 minutes cycles on and off 3 Evaporator fan s on 1 Compressor off continuously 2 Cond
35. ature or defrost 1 Compressor off timer reaches 1 hour 2 Evaporator fan s off Defrost heater 3 Condenser fan off 4 Defrost heater on 5 displayed Five minutes after Eight minutes after evaporator compressor start up fan start up dF no longer 1 Evaporator fan s on displayed cabinet temperature 2 Condenser fan on Note displayed 1 Cut on cut off and cabinet temperature are read by the same sensor called the cabinet thermistor 2 The defrost thermistor reads the evaporator temperature 3 There is a five second evaporator fan startup delay when the compressor and fan would otherwise start together 15 NO eiqeisnfpy 121 180494 9 lt 9 1 330 330 Aejaq 10 uiu 8 430 Jo9jeaH 150901 uoneunq 1504jeq uiui 09 gt Aejaq ue4 8 330 330 Aeq i 440 uws 330 10569 4 9 3049 10 51 19 1 1 9014 1urodies ing Chart Freezers Continuous Operating Mode iming b T 3 1sojjeq 3 Refrigerators Energy Saving Operating Mode a Sequence of
36. avoid damaging the air filter do not use water hotter than 104 F 40 C The filter is located behind the front panel This filter can be removed by opening the front panel and lifting the filter away from the condenser Reinstall the filter after cleaning 6 Shelves Remove and clean regularly 7 Drawers On units with drawers the drawers can be removed for cleaning either individually or as an entire assembly To remove an individual drawer first remove all food product from the drawer Pull the drawer out to its fully extended position and lift up on the handle to disengage the drawer Before removing the drawer carefully support the rear and front of the drawer and then slowly remove it from the cabinet To remove the drawer frame assembly first remove the drawers and then remove the fasteners in the thermal break and in the rear of the cabinet Carefully slide the frame out of the cabinet making sure not to damage the thermal break Reinstall in the reverse order making sure not to overtighten the screws in the thermal break To remove the drawer slide center slide containing rollers for cleaning rotate the top of the slide away from the frame while the slide is completely inside the cabinet Drawer slides do not require lubrication but slides should be kept clean and free of food Note Drawer slides are dishwasher safe B Maintenance 1 Air Filter The air filter promotes clean condenser surfaces and efficient unit
37. e Settings and Diagnostics Menu 0 delay 1 1 hour 222 hours 3 3 hours When temperature returns to setpoint range alarm code E2 will clear The value of y can be changed under F4 on the Settings and Diagnostics Menu 0 delay 1 hour E3 may alternate with dF instead of the temperature Clean filter if necessary Allow time for pressure switch to react then turn power off and back on again to reset If switch trips 5 times in 1 hour and the above steps do not clear alarm code see the procedure contained in this section Clean filter Allow time for sensor to react then turn power off and back on again to reset After replacing sensor alarm will reset After replacing sensor alarm will reset After replacing the control board alarm will reset After replacing the control board alarm will reset 1 Alarm Display Priority If multiple alarms occur simultaneously only the alarm with the higher priority is displayed EEPROM Verification or Read Error Alarm 2 EEPROM Write Error Alarm 3 Defrost Temperature Sensor Malfunction Alarm ED 1 EMES E9 4 Clogged Filter Sensor Malfunction Alarm ___ Ez 8 Clogged Filter Alarm 7 Defrost Alarm E amp E 8 High Temperature Alarm ED EA E8 E9 4 5 High Pressure Alarm E7 i 1 2 Low Temperature Alarm 34 2 Alarm Details and Countermeasur
38. e ENERGY STAR prevent greenhouse gas emissions by meeting strict energy efficiency guidelines set by the U S Environmental Protection Agency and the U S Department of Energy Several models of Hoshizaki undercounters have earned the ENERGY STAR To easily determine if your unit has earned the ENERGY STAR see the nameplate attached to the right wall on the inside of the cabinet ENERGY STAR 2 Please review this manual It should be read carefully before the unit is serviced or maintenance operations are performed Only qualified service technicians should service and maintain the unit This manual should be made available to the technician prior to service or maintenance CONTENTS 5 Nameplate Ratings B 1 HUR40A 6 03 0 11 Pp 6 2 HWR40A ce 7 2 HWR40A D FAW Ur NE 7 3 HURG68A ERREUR T UU S 8 68 al i NT 8 4 HWR68A 9 4a HWR68A D 5 9 Mr RENT 10 lic D
39. e for any defrost manual or auto to be initiated b Defrost Termination Temperature F1 To change the defrost termination temperature follow the steps below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Diagnostics 2 Press and hold both the button and the Q unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F1 appears in the display window 27 3 Press the unmarked blank button to display the current setting Press the down button to increase or decrease the defrost termination temperature Note The defrost termination temperatures can be adjusted within the following ranges Refrigerator 59 to 68 F 15 to 20 C in one degree increments Freezer 41 to 68 F 5 to 20 in one degree increments 4 Press the e unmarked blank button to save the setting 5 Press the MANUAL DEFROST button to return to the menu screen Press and hold both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 6 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete c Setpoint Temperature Differential F2 To change the differential follow the steps
40. enser fan off 3 Evaporator fan s cycles on and off Cycle On Cut on temperature reached Minimum 2 minutes 1 Compressor start up 2 Condenser fan start up Defrost Start 3 Evaporator fan s on Preprogrammed time interval continuously 1 Compressor off 2 Evaporator fan s off 3 Condenser fan off Continue as 4 Defrost heater on normal cycling 5 dF displayed Defrost End Defrost thermistor reaches defrost termination temperature or defrost timer reaches 1 hour Defrost heater off Five minutes after Five minutes after Eight minutes after evaporator defrost heater off compressor start up fan start up dF no longer 1 Compressor on 1 Evaporator fan s on displayed cabinet temperature 2 Condenser fan on displayed Note 1 Cut on cut off and cabinet temperature are read by the same sensor called the cabinet thermistor 2 The defrost thermistor reads the evaporator temperature 19 Chart Freezers Energy Saving Operating Mode iming b T 5 pue uaym dn yejs 10 0 puooes Aejdsiq uiu 8 5 440 10889 4 E Aejaq uiu uiu Hes 150494 9 uoneung 1soJjeq uiui 09 gt NO
41. ensor exceeds the open circuit detection point equivalent to 7 6 F 22 The input from the clogged filter sensor drops below the short circuit detection point equivalent to 186 8 F 86 C A functioning clogged filter sensor gray is installed Possible Causes Trouble with the clogged filter sensor gray Timer Start Timer Start Under 10 min p d Short Circuit Error Reset Short Circuit Detection Point 186 8 F 86 Open Circuit Error Reset Open Circuit Detection Point 7 6 F 22 C E9 i Blinking Blinking Cabinet Temperature Cabinet Temperature Display Display 40 Temperature Display h Control Board Error Alarms EA and ED EA is displayed when an EEPROM write error is detected ED is displayed when EEPROM verification or read error is detected Reset Options Replacing the control board with a functioning replacement control board will eliminate this error condition 41 B Diagnosis Chart 1 Compressor Supply 1 Move to ON position Circuit Breaker 1 Tripped 1 Check and reset Call kitchen electrician if breaker trips repeatedly eJ Wiring to Control Board 422 g High Pressure Switch 2 Has operated 5 or 2 Determine why pressure more times in one switch is activated hour E4 should be displayed Compressor Overload 1 Defective Contacts 1 Replace open Relay Condensing
42. es a High Temperature Alarm E1 If the cabinet temperature exceeds the setpoint temperature by 14 4 F 8 C or more for more than x hours E1 is displayed The default value of x is 2 2 hours The value of x can be changed under on the Settings and Diagnostics Menu 0 delay 1 1 2 2 3 3 hours Note After the machine has been turned off and then turned back on the high temperature alarm feature is not active until the cabinet temperature reaches the lower setpoint temperature differential The high temperature alarm feature operates even during defrost Reset Options The alarm will automatically reset once the cabinet temperature reaches the lower setpoint temperature differential Possible Causes The door is opened frequently or is not completely closed Trouble with the compressor or a gas leak Trouble with the cabinet thermistor black 5 High Temp _ Power On 120 minutes Alarm Reset High Temp Alarm Timer 120 minutes High Temp Alarm Timer Under 120 minutes High Temperature Alarm Temperature 14 4 F 8 C above setpoint temperature Upper Setpoint Temperature Differential Setpoint Temperature Lower Setpoint Temperature Differential Total Differential 1 High Temp i Alarm Reset Cabinet Temperature Display Blinking Temperature Display 35 b Low Temperature Alarm E2 If the cabinet temperature drops below the setpoint temperature by 9 F 5 or m
43. essor turns on To set the setpoint temperature follow the steps below 1 Press the button to display the current setpoint temperature 2 To change the setpoint press and hold the button while pressing the down button to raise or lower the setpoint Mods Allowable Setpoint Range Default Refrigerator auxiliary code Q5 and earlier 421 to 53 6 to 4 12 Refrigerator auxiliary code Q6 and later Freezer Door 18 to 19 25 to 7 Freezer Drawer vas doro 3 After 10 seconds the new setpoint will be saved automatically Note For refrigerators the temperature differential for the compressor to turn off is 4 5 F 2 5 C for auxiliary code Q5 and earlier and 3 6 F 2 0 C for auxiliary code Q6 and later For 1 section freezers it is 6 3 F 3 5 and for 2 section freezers it is 3 6 F 2 0 C 24 c Cabinet Temperature Correction calibration factor In cases where there is a discrepancy between the actual cabinet center temperature and the displayed temperature for a particular model a calibration factor is used to correct the displayed temperature WARNING This unit has been factory tested with the default settings listed Avoid using this function except to confirm that the setting is correct If set incorrectly the display could show an acceptable temperature even though the temperature is out of the proper range This value should o
44. f large 1 Cover product with plastic water overflow volumes of warm wrap moist uncovered product b Location of Unit 1 Unit located near high 1 Relocate humidity source such as fryer steamer etc 1 Poor sealing around 1 Adjust or replace evaporator door gaskets d Environment 1 Extreme environment 1 Adjust conditions and door opening conditions 11 Abnormal Noise a Fasteners 1 Loose fasteners allow 1 Tighten fasteners vibration of part b Compressor 1 Problem with mount 1 Properly mount compressor Replace any missing grommets 2 Floodback to 2 Check for signs of floodback compressor to compressor Evacuate and recharge if necessary c Fan 44 C Thermistor Check A thermistor semiconductor is used for the cabinet control sensor and defrost termination sensor The resistance varies depending on temperature No adjustment is required If necessary check for resistance between thermistor leads and visually check the thermistor mounting emperature Resistance Cabinet Defrost Thermistors Clogged Filter Thermistor C N A 160 n i Cabinet amp Defrost Thermistor T R Curve Clogged Filter Thermistor T R Curve Rz 6xExp 3390x 7L 17 This curve is for reference only 0 TER 5 14 23 32 41 50 59 68 77 86 95 1
45. gnostics 2 Press and hold both the button and the unmarked blank button for 5 seconds If FO is not displayed press the MANUAL DEFROST button until FO appears in the display window 3 Press the unmarked blank button to display the current setting default 6 Press the down button to increase decrease the number of hours between each defrost The interval can be from 1 to 12 hours in increments of 1 hour 4 Press the e unmarked blank button to save the setting 5 Press the MANUAL DEFROST button to return to the menu screen Press and hold both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 6 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete Note The defrost is a heated defrost and therefore has a tendency to raise cabinet temperature When the unit goes into defrost during energy saving mode evaporator fan s and or perimeter frame heaters will turn off Cabinet temperature is not displayed during defrost dF is displayed in its place The change in the defrost setting will take effect immediately The next defrost will take place after the newly set time interval has elapsed Initiating a manual defrost will restart the defrost timer The evaporator temperature must be below the defrost completion temperatur
46. h Pressure Alarm E4 In order to protect the compressor if the discharge pressure reaches a preset value outside the normal operating range a switch will temporarily stop the compressor At another preset pressure the compressor will attempt to restart If the switch is triggered 5 or more times in one hour E4 will be displayed Reset Options To reset the alarm turn the unit off and then back on Possible Causes The condenser air filter is dirty There is blockage or contamination inside the capillary tube or elsewhere in the refrigeration circuit The condenser fan motor is locked or otherwise not functioning 37 e Clogged Filter Alarm E7 The unit is equipped with a filter for protecting the condenser from dirt oils grease etc The filter promotes clean condenser surfaces and efficient operation and should be checked twice monthly and cleaned when necessary The unit is also equipped with a sensor to determine if this filter is excessively dirty If the unit detects that the condenser filter is excessively dirty by sensing a temperature at the condenser outlet of at least 136 4 F 58 C for over 2 minutes E7 will be displayed Reset Options After cleaning the filter the alarm will automatically reset once the temperature at the condenser outlet drops below 136 4 F 58 C Possible Causes e The condenser air filter is dirty The condenser fan motor is locked or otherwise not functioning IMPORTANT
47. herwise start together 13 Chart Refrigerators Continuous Operating Mode iming b NO 5 15048 Q1 sJnou 9 lt pue 90 pue Aeldsiq 31 04 Xen uiu 09 gt ue4 uiui Aejeq 440 yes 1 E uiu z NO 330 330 Joje2ipu 3soJjeg NO 330 JojeoH 1soJjog NO 430 S ueJ s ue4 10 3 T 330 uey 330 JosseJduio 2 NO 1utodies 40jsiuuau JOUIqeD jenuejeyiq Julodjag 40jsiuuoau 1soJjeg einjejeduie uoneuiuue 2 Freezers Continuous Operating Mode a Sequence of Operation POWER ON Board Self Check 1 Frame heater s on 2 Evaporator fan s on Cycle On Cut on temperature reached Minimum 2 minutes 1 Compressor start up 2 Condenser fan start up Continue as normal cycling Five minutes after defrost heater off 1 Compressor on 2 minute delay Cycle Off Cut out 1 Compressor start up temperature reached 2 Condenser fan start up Minimum 2 minutes 1 Compressor off 2 Condenser fan off Defrost end Defrost thermistor reaches defrost Defrost Start termination Preprogrammed time interval temper
48. in Model Name on Current Nameplate Name UR1 SSB HUR40A refer to the table below UR2 SSB HUR68A UF1 SSB HUF40A UF2 SSB HUF68A B Dimensions Door Opening mm Total Refrigerated Total Shelf Hotel Pan Width Height Volume ft Space ft Capacity D HURAOA D HWR40A D 8 5 76 4 HUF40A D HWF40A D D HUR68A D HWR68A D HUF68A D HWF68A D D HUR96A D HWR96A 1 HUR40A HUF40A Units mm in 860 8 1023 40 3 1 570 2 22 5 G xL QU Yl say 14422 568 6212 245 HUR40A D HUF40A D INTERNAL VOLUME 8 5 DOOR STOP POSITION 110 DOOR STAY OPEN ANGLE 105 1 FRONT 13 1 NO Ow NIS y Xe Slew lt ojs NI lt 9 1 654 2 25 8 B cm fke m m ep E m m 3 1 CLEAR DOOR OPENING MEASURES 554 8W x 616 2 22 x 243in N Ss s EN 226 2 821 9 32 3 6495 B 2508 30 25 6 al WS m 7 gt E se as 3 8 F Y 8128 32 DRAWER CARTRIDGE SIZED FOR A MAXIMUM OF FOUR 1 1 P
49. jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete e Low Temperature Alarm Delay Time F4 To change the low temperature alarm delay time follow the steps below 1 Make sure the jumper is removed between connector K151 pins 7 and 8 on the control board Otherwise you will not be able to access this setting For details see D 1 Gaining Access to Settings and Diagnostics 2 Press and hold both the button and the unmarked blank button for 5 seconds FO should appear in the display window Press the MANUAL DEFROST button until F4 appears in the display window 3 Press the e unmarked blank button to display the current setting Press the down button to increase or decrease the low temperature alarm delay time Note The time can be or 60 minutes The display corresponds to time as follows Display Detection Time minutes 1 60 29 4 Press the unmarked blank button to save the setting 5 Press the MANUAL DEFROST button to return to the menu screen Press and hold both the button and the unmarked blank button for 5 seconds to exit the setting mode and return to the temperature display 6 If a jumper was present between connector K151 pins 7 and 8 reconnect it after all setting and diagnostic work is complete f Temperature Display Scale F5 For information about switching the display between F and C
50. lectronic 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 404A or R 134a as a mixture with pressurized air for leak testing 1 Refrigerant Recovery The undercounter unit is provided with a refrigerant access valve Using proper refrigerant practices recover the refrigerant from the access valve and store it in an approved container Do not discharge the refrigerant into the atmosphere 2 Brazing WARNING 1 R 404A and R 134a are not flammable at atmospheric pressure and temperatures up to 176 F 80 C 2 R 404A and R 134a themselves are not explosive or poisonous However when exposed to high temperatures open flames these refrigerants can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous 3 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 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 404A or R 134a as a mixture with pressurized air for leak testing 46 1 Always install a new drier every time the sealed refrigeration
51. m 58 A1 HUR40A 40 auxiliary code Q5 and 58 A2 HUR40A D HWR40A D auxiliary code and later 59 HWF40A D 60 C1 HUR68A HWR68A auxiliary code Q5 and earlier 61 C2 HUR68A D HWR68A D auxiliary code and later 62 D HUF68A D HWIPOSA D 63 E HBRSBACD HWRBBA ER Errata 64 l Specifications A Nameplate Ratings Design Pressure Refrigerant E Model AC Supply Voltage Amperes LO 404A 134a HURAOACD HWR40A D 115 601 50 240 120 152 HUR68A D HWR68ACD 115 601 50 240 120 152 HUR96A D 96 115 601 60 240 120 152 HUF40A D 115 601 55 450 250 141 HUF68A D HWF68A D 185 601 100 450 250 130 Undercounter Model Names The undercounter models covered in this service manual initially had different model names If you have a unit with an auxiliary code of N 6 and a serial number ending
52. mperature rrr nono 27 Setpoint Temperature Differential 2 28 d High Temperature Alarm Delay Time 29 Low Temperature Alarm Delay Time 4 29 f Temperature Display Scale FS 30 o FAIA History 30 h Compressor Run Time F7 31 Z Operalidg gan 31 32 D 540110 32 Automatic Corrections Made During Energy Saving Operating Mode 32 Frame TAC ANC ate a 32 Service 33 Po D 33 1 Alarm Display a dria pa Kec 34 2 Alarm Details and Countermeasures 35 a High Temperature Alarm xara roa 35 b Low Temperature Alarm 2 36 C D frost Alarm E3 37 d High Pressure Alarm E asses 37 6 Clogged Filler Alarm reaa 38 f Defrost Temperature Sensor Malfunction Alarm E8 39 g Clogged Filter Sensor Malfunction Alarm 9
53. nd low Il D 3 c for defaults b Frozen Food 1 Frozen food recently 1 Allow time for unit to return to placed in refrigerator setpoint temperature Thermistor 1 Defective 1 Check and replace d Compressor Relay 1 Defective contacts 1 Replace welded e Control Board 1 Defective 1 Replace Evaporator does 5 Thermistor 1 Defective 1 Check and replace not defrost b Defrost 1 Not enough defrosts 1 Factory default is once every completely occurring per day 6 hours If coil is frosting too Operation in humid much can shorten defrost conditions interval Defrost Heaters 1 Defective 1 Replace heaters d Safety Defrost 1 Defective turning off 1 Replace safety defrost Thermostat heaters prematurely thermostat or fused open e Defrost Heater 1 Blown 1 Determine why fuse blew Temperature Fuse Replace fuse 43 Possible Cause 9 Defrost cycle a Defrost Thermistor 1 Defective 1 Replace lasts too long b Control Board 1 Defective 1 Replace Defrost 1 Not enough defrosts 1 Factory default is once every occurring per day 6 hours If coil is frosting too Operation in humid much can shorten defrost conditions interval d Defrost Heater 1 Defective 1 Replace heaters e Safety Defrost 1 Defective turning off 1 Replace safety defrost Thermostat heaters prematurely thermostat or fused open 10 Condensate a Cabinet Contents 1 Loading o
54. nly be changed after consulting with the factory To view the current value follow the steps below 1 Turn the power on while pressing the up button The current correction calibration factor will be shown If 18 is displayed the value is 1 8 F 1 0 See the table below for the default values Cabinet Temperature Correction Calibration Factor BDefalt _______ Setting Range Section 2 Section 3 Section 00 0 0 6 3 6 F Refrigerator 22 2 9 9 to 9 9 F in 0 9 F increments 00 0 0 0 2 0 9 5 to 9 5 in 0 5 1 8 F 45 4 5 F Freezer 25 2 5 C 2 If itis determined through discussion with the factory that the setting needs to be changed press the down button to increase or decrease the value 3 Press the button to save the new value 4 Turn the power off and then back on The unit will start running with the new value Example Setpoint Temperature 37 F 3 C When the average cabinet temperature is 5 4 F 3 0 higher than the thermistor detected temperature change the correction calibration factor to 5 4 F 3 0 nae Cabinet Temperature 37 F Thermistor 3 C Detected Temperature 25 3 Settings and Diagnostics Menu To gain access to the settings see II D 1 Gaining Access to Settings and Diagnostics Once inside this menu press the MANUAL DEF
55. nt temperature Off Time OnTime Setpoint Temperature seconds seconds 23 to 30 F 5 to 0 ml uml 25 to c Automatic Corrections Made During Energy Saving Operating Mode 1 Temperature Display Correction When the unit is in energy saving mode and the evaporator fan shuts off the temperature at the cabinet thermistor drops due to its close proximity to the evaporator Therefore the temperature at the cabinet thermistor does not accurately reflect the true cabinet temperature To compensate for this the cabinet temperature registered at compressor shutoff is displayed for 120 seconds after shutoff when in energy saving mode After 120 seconds the cabinet temperature plus 1 8 F 1 C will be displayed Once the compressor turns back on the display will return to the normal display 2 Temperature Differential Correction During energy saving mode the cabinet temperature tends to be higher than during normal operation because the evaporator fan operates only intermittently when the compressor is off The upper setpoint differential for turning the compressor on is automatically adjusted to compensate E Perimeter Frame Heater This unit is equipped with a perimeter frame heater This prevents the formation of condensate on the front frame of the unit under high humidity conditions Note On refrigerators with auxiliary code Q6 and later perimeter frame heater s operate together with the evaporator f
56. ontains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the unit when handling or replacing the board Do not touch the electronic devices on the board or the back of the board to prevent damage to the board Do not attempt to repair the board in the field Always replace the whole board assembly if it goes bad Do not short out power supply to test for voltage Keep the thermistor leads clogged filter sensor leads and pressure switch leads at least 1 5 away from high voltage leads AC 100 volts or more to protect against electrical noise 1 Turn off power and unplug the unit 2 Remove the front panel 3 Remove the wire guard then remove all wiring connections at the bottom of the control box 4 Remove the control box by loosening the 4x8 T2 screw securing the bottom control box bracket to the evaporator case cover 5 Remove the three 4x8 T2 screws from the control box top and bottom then carefully remove the control box cover 6 Unhook all wiring connections to the control board 7 Remove the control board by carefully removing the four 4x8 T2 attachment screws 8 Identify the part number and software revision of the new board and make sure it is interchangeable with the old board 9 Install the new board in the control box taking care not to damage it 10 Hook all wiring connections back to the control board 11 Check
57. operation by removing dirt and grease from circulating air The filter should be checked monthly and cleaned when necessary as described in A 5 Air Filter All other maintenance or service on this unit should be performed in accordance with the Hoshizaki Service Manual by a qualified service technician 57 VI Wiring Diagrams HUR40A HWR40A auxiliary code Q5 and earlier AMP WIRE COLOR CODE CAP PLUG N ui lt 115 601 gt VIAL WR WR IGHTBLUE WIR TE RED Note Jumper color white between pins 7 and 8 of connector K151 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 58 A2 HUR40A D HWR40A D auxiliary code Q6 and later WIRE COLOR CODE BROWN 3 PRONG WHITE 15 AMP CAP PLUG N L C 115 60 1 gt 5 BK Transformer Output 10V at 115V Katt CONTROL BOARD 19 km 1191 Note Jumper color white between pins 7 and 8 of connector K151 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm tha
58. or exceeds the open circuit detection point equivalent to 67 F 55 The input from the defrost thermistor drops below the short circuit detection point equivalent to 122 F 50 A functioning defrost thermistor orange is installed Possible Causes Trouble with the defrost thermistor orange Timer Start Timer Start Under 10 min Short Circuit Error Reset Short Circuit Detection Point 122 F 50 Open Circuit Error Reset Open Circuit Detection Point 67 55 Es Blinking Blinking Cabinet Temperature Cabinet Temperature Display i Temperature Display Display 39 9 Clogged Filter Sensor Malfunction Alarm E9 If the input from the clogged filter sensor is below the clogged filter sensor open circuit detection point equivalent to 7 6 F 22 C E9 is displayed E9 is also displayed when input from the clogged filter sensor is above the clogged filter sensor short circuit detection point equivalent to 186 8 F 86 C for 10 minutes or more Note f this alarm appears first make sure that the sensor is properly connected A short circuit can be detected immediately by turning on the power while pressing the button In this case E9 will be displayed immediately if a short circuit is detected Reset Options The alarm automatically resets when one of the following conditions is met The input from the clogged filter s
59. ore for more than y minutes E2 is displayed The default value of y is 1 1 hour The value of y can be changed under F4 on the Settings and Diagnostics Menu 0 delay 1 1 hour Note The low temperature alarm timer starts once the cabinet temperature drops 9 F 5 C below the setpoint temperature low temperature alarm feature operates even during defrost Reset Options The alarm will automatically reset once the cabinet temperature reaches the upper setpoint temperature differential Possible Causes Ambient temperature is low Trouble with the cabinet thermistor black Low Temp Power on Total Differential Alarm Reset Upper Setpoint Temperature Differential Setpoint Temperature Lower Setpoint Temperature Differential Low Temperature Alarm Temperature 9 F 5 C below setpoint temperature Under 60 minutes 60 min Low Temp Alarm Timer Reset i i 2 Blinkin Temperature Display Cabinet Temperature Display g 36 c Defrost Alarm If the defrost thermistor does not turn off in one hour after defrost begins is displayed When ES is displayed the next step in the defrost termination process drain fan delay defrost display delay begins Reset Options To reset the alarm turn the unit off and then back on Possible Causes Trouble with the defrost heater The temperature fuse is blown Trouble with the defrost thermistor orange d Hig
60. r Case B Sequence of Operation and Timing Charts For details on operating modes see 1 0 4 Operating Modes 1 Refrigerators Continuous Operating Mode a Sequence of Operation POWER ON Board Self Check 1 Frame heater s on 2 Evaporator fan s on 2 minute Delay 1 Compressor start up 2 Condenser fan start up Cycle Off Cut out temperature reached Minimum 2 minutes 1 Compressor off 2 Condenser fan off Defrost End Defrost thermistor reaches defrost termination temperature or defrost timer reaches 1 hour Defrost heater off Cycle On Cut on temperature reached Minimum 2 minutes 1 Compressor start up 2 Condenser fan start up Defrost Start Preprogrammed time interval 1 Compressor off 2 Evaporator fan s off 3 Frame heater s off Q6 and later 4 Condenser fan off 5 Defrost heater on 6 dF displayed Continue as normal cycling Five minutes after defrost heater off 1 Compressor on 2 Condenser fan on One minute after evaporator fan start up dF no longer displayed cabinet temperature displayed Five minutes after compressor start up 1 Evaporator fan s on 2 Frame heater s on Q6 and later Note 1 Cut on cut off and cabinet temperature are read by the same sensor called the cabinet thermistor 2 The defrost thermistor reads the evaporator temperature 3 There is a five second evaporator fan startup delay when the compressor and fan would ot
61. r checks and corrections turn power supply off and back on again If the error code still appears contact an authorized Hoshizaki service company WARNING connect rain power 2 Temperature Display Displays the cabinet temperature The factory setting is F To change the display to the scale see a Switching the Display Between Fahrenheit and Celsius F5 below The cabinet temperature is updated every 30 seconds During defrost dF is displayed in place of the cabinet temperature a Switching the Display Between Fahrenheit and Celsius F5 The factory setting is F To change the display to C follow the steps below 1 Press and hold both the button and the unmarked blank button for 5 seconds F5 appears in the display window If FO is displayed press the MANUAL DEFROST button until F5 appears 2 Press the unmarked blank button to display the current setting default F Press the down button to switch to Press the e unmarked blank button again to save the setting 3 Press and hold both the button and the unmarked blank button for 5 seconds The cabinet temperature will be displayed using the newly saved temperature scale 4 Affix the C label supplied with the unit to the display panel covering F but not the display window b Adjusting the Setpoint Temperature The setpoint temperature is the temperature at which the compr
62. s secured with a cable tie Remove each with care 6 Remove the thermistor wire connection below the control box 7 Install the new thermistor and return the refrigeration unit to its proper position in the reverse order of the removal procedure 8 Plug in the unit and turn on the power supply Clogged Filter Thermistor sensor 5 The thermistor element is secured to the condenser outlet pipe with aluminum tape and the wire is secured with a cable tie Remove each with care 6 Remove the thermistor wire connection below the control box 7 Install the new thermistor and return the refrigeration unit to its proper position in the reverse order of the removal procedure 8 Plug in the unit and turn on the power supply 52 Removal and Replacement of Door Gasket Remove old gasket by pulling it directly out of the vinyl gasket retainer Thoroughly clean the gasket area with mild soap and water prior to installing the new gasket The new gasket should be installed by assembling it at the corners first then working toward the center at the top bottom and sides The arrow shaped portion of the gasket should be firmly seated in the retainer groove for proper assembly This can be checked by lifting the edge of the gasket and observing the engagement CAUTION In order to get a proper gasket fit it is important not to stretch gasket material during assembly H Removal and Replacement of Defrost Heater 1 Turn off
63. se the low side service manifold valve 5 Turn off the vacuum pump Disconnect the vacuum pump hose 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 ARI Standard No 700 latest edition be used 6 A liquid charge is required for charging an R 404A system and optional for charging an R 134a system Invert the service cylinder and place it on scales Open the low side service manifold valve IMPORTANT In order to prevent compressor damage use caution in charging large quantities of liquid into the low side 7 Allow the system to charge with liquid until the proper charge weight is met 8 Close the refrigerant service cylinder access valve and disconnect the hose Close the service manifold valve and disconnect the low side hose 9 Cap the access valve to prevent a possible leak 47 B Removal and Replacement of Refrigeration Unit 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration unit Support the evaporator as it clears the evaporator case 5 Replace the removed parts in
64. 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 2 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Note Because the pipes in the evaporator case are specially coated to resist corrosion itis important to make connections outside the evaporator case when possible If itis necessary to braze inside the evaporator case use sandpaper to remove the coating from the brazing connections before unbrazing the components 3 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 404 or R 134a as a mixture with pressurized air for leak testing 3 Evacuation and Recharge 1 Attach a vacuum pump to the system using the low 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 Open the low side service manifold valve 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 Clo
65. t you have the proper wiring diagram by checking against the diagram located inside the front panel 59 HUF40A D HWF40A D 3 PRONG 15 AP PLUG N 115 60 1 20 rn C c2 rn OWN HITE LACK 0 ORANGE IP PIN co ii lt c zu 20 imal gt lt BU DARKBLUE VIOLET YELLOW __ GHTBLUE TE RED lt lt LBU W R j Transformer Output 10V at 115V K251 Kio CONTROL BOARD Note Jumper color white between pins 7 and 8 of connector K151 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 60 C1 HUR68A HWR68A auxiliary code Q5 and earlier PAM WIRE COLOR CODE CAP PLUG N L go ox 115 60 1 Kw X 4 PERIETER aurium HEATER USE wn WR WR REMO RERERATR Ld AS LBU LIGHTBLUE 1 BLACK REFRIGERATOR Y REDUNDANT W R WHITE RED Bi 43 lt 9 a x 5 Note Jumper color white between pins 7 and 8 of connector K1
66. te between pins 7 and 8 of connector K151 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 63 E HUR96A D HWR96A D WIRE COLOR CODE 3 PRONG BR BROWN PLUG N L POWER SWITCH 115 60 1 63 Transformer Output 10V at 115V 89594 251 CONTROL BOARD Note Jumper color white between pins 7 and 8 of connector K151 may not be present on all units but this will not adversely affect performance CAUTION Before diagnosing and or servicing the unit confirm that you have the proper wiring diagram by checking against the diagram located inside the front panel 64
67. the reverse order of which they were removed 6 Replace the front panel and all other guards in their correct positions 7 Plug in the unit and turn on the power supply CAUTION 1 To avoid a gas leak be sure to prevent the refrigeration piping from coming into contact with the body when taking out and returning the refrigeration unit to its original position 2 Do not let the fan motor or high pressure pipe touch wires Refrigeration Unit Front Panel C Removal and Replacement of Compressor IMPORTANT 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 Note When replacing a compressor with a defective winding be sure to install a new start capacitor overload and start relay Due to the ability of the POE oil in the compressor to absorb moisture quickly the compressor must not be opened more than 15 minutes for replacement or service Do not mix lubricants of different compressors even if both are charged with the same type of refrigerant except when they use the same lubricant 48 1 Turn off the power supply and unplug the unit 2 Remove the front panel then remove the wire guard located below the display panel 3 Unhook the wiring connectors at the control box then remove the two hexhead M6 attachment nuts and the M5 bolt 4 Very carefully slide out the refrigeration system Support the ev

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