Hoshizaki HWR68A(-D) manual

Hoshizaki “A Superior Degree of Reliability” www .hoshizaki.com Models Refrigerators HUR40A(-D) HWR40A(-D) HUR68A(-D) HWR68A(-D) HUR96A(-D) HWR96A(-D) Freezers HUF40A(-D) HWF40A(-D) HUF68A(-D) HWF68A(-D) Commercial Refrigerators & Freezers Undercounter & Worktop Series Hoshizaki America, Inc. Number: 73123 Issued: 2-4-2005 Revised: 9-30[...]

 IMPORTANT Only qualied 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 qualied service technicians in the service and maintenance of the unit. Should the [...]

3 CONTENTS I. Specications ..................................................................................................................... 5 A. Nameplate Ratings ....................................................................................................... 5 B. Dimensions ...........................................................[...]

4 4. Operating Modes ................................................................................................... 31 a) Continuous ....................................................................................................... 3 b) Energy Saving ......................................................................................[...]

5 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 in "H", refer to the table below. Model Name on Nameplate Current Name UR1-SSB HUR40A UR-SSB HUR68A UF1-SSB HUF40A UF-SSB HUF68A I. Speci?[...]

6 Units: mm (in.) 1a. HUR40A-D, HUF40A-D 1. HUR40A, HUF40A[...]

7 2. HWR40A, HWF40A Units: mm (in.) 2a. HWR40A-D, HWF40A-D[...]

8 3. HUR68A, HUF68A Units: mm (in.) 3a. HUR68A-D, HUF68A-D[...]

9 4. HWR68A, HWF68A Units: mm (in.) 4a. HWR68A-D, HWF68A-D[...]

10 5. HUR96A 5a. HUR96A-D Units: mm (in.)[...]

11 6a. HWR96A-D 6. HWR96A Units: mm (in.)[...]

1 Compressor Base Condenser Fan Motor Front Panel Evaporator Case Cover Control Box Compressor Side Panel Evaporator Case Capillary Tube/Suction Line Assembly Condenser Evaporator Assembly Access Valve (Low-Side) Cabinet Thermistor Thermal Fuse Evaporator Case Cover Evaporator Fan Motor Evaporator Defrost Heater Defrost Thermistor Evaporator Shr[...]

13 Note: 1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet thermistor." ) The defrost thermistor reads the evaporator temperature. 3) There is a ve second evaporator fan startup delay when the compressor and fan would otherwise start together. B. Sequence of Operation and Timing Charts For [...]

14 b) Timing Chart Refrigerators – Continuous Operating Mode N O F F O N O F F O F F O N O N O F F O ) + ( l a i t n e r e f f i D + t n i o p t e S ) - - ( l a i t n e r e f f i D + t n i o p t e S g n i n a e m o N N O F F O N O F F O r o t s i m r e h T t e n i b a C r o t s i m r e h T t s o r f e D o s s e r p m o C r n a F r e s n e d n o C[...]

15 2. Freezers – Continuous Operating Mode a) Sequence of Operation Note: 1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet thermistor." ) The defrost thermistor reads the evaporator temperature. 3) There is a ve second evaporator fan startup delay when the compressor and fan would otherw[...]

16 b) Timing Chart Freezers – Continuous Operating Mode N O F F O N O F F O ) + ( l a i t n e r e f f i D + t n i o p t e S ) - - ( l a i t n e r e f f i D + t n i o p t e S g n i n a e m o N F F O N O N O F F O N O F F O N O F F O o t s i m r e h T t e n i b a C r o t s i m r e h T t s o r f e D r o s s e r p m o C r n a F r e s n e d n o C n(s)[...]

17 3. Refrigerators – Energy Saving Operating Mode a) Sequence of Operation Note: 1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet thermistor." ) The defrost thermistor reads the evaporator temperature. Defrost End Defrost thermistor reaches defrost termination temperature, or defrost timer[...]

18 b) Timing Chart Refrigerators – Energy Saving Operating Mode N O F F O N O F F O ) + ( l a i t n e r e f f i D + t n i o p t e S ) - - ( l a i t n e r e f f i D + t n i o p t e S g n i n a e m o N F F O N O N O F F O N O F F O N O F F O r o t s i m r e h T t e n i b a C r o t s i m r e h T t s o r f e D o s s e r p m o C r n a F r e s n e d n [...]

19 4. Freezers – Energy Saving Operating Mode a) Sequence of Operation Note: 1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet thermistor." ) The defrost thermistor reads the evaporator temperature. Five minutes after defrost heater off 1. Compressor on . Condenser fan on Five minutes aft[...]

0 b) Timing Chart Freezers – Energy Saving Operating Mode n e h w y a l e d p u t r a t s n a f r o t a r o p a v e d n o c e s e v i F N O F F O N O F F O ) + ( l a i t n e r e f f i D + t n i o p t e S ) - - ( l a i t n e r e f f i D + t n i o p t e S g n i n a e m o N F F O N O N O F F O N O F F O N O F F O r o t s i m r e h T t e n i b a C[...]

1 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. . The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especial[...]

 2. Control Board Layout Note: Fuse at position F101 on board is not currently used. The board can function without this fuse. SW 135 Display Setpoint SW 134 Raise Setpoint SW 133 Lower Setpoint SW 131 Energy Saving/ Service Button SW 13 Manual Defrost LED 13 Lit for Negative Values LED 14 Temperature and Alarm Display (brown) Compre[...]

3 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  mi[...]

4 2. Temperature Display • Displays the cabinet temperature. The factory setting is °F. To change the display to the °C 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 tem[...]

5 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 usi[...]

6 Code Item Setting and Display Range Default Refrigerator Freezer Auxiliary Code 1 section 2 section Q5 and earlier Q6 and later F0 Defrost Interval 1 to 1 hours in 1 hour increments 6 6 6 F1 Defrost Termination Temperature Refrigerator: 59 to 68°F (15 to 0°C) in one degree increments Freezer: 41 to 68°F (5 to 0°C) in one degree in[...]

7 a) Defrost Interval (F0) 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 [...]

8 3) Press the unmarked, blank button to display the current setting. Press the up or 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 0°C) in one degree increments • Freezer: 41 to 68°F (5 t[...]

9 d) High Temperature Alarm Delay Time (F3) 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." )[...]

30 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 al[...]

31 h) Compressor Run 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. ) Press and hold both the button and the unmarked, blank button for[...]

3 Model Setpoint Temperature Off Time (seconds) On Time (seconds) Refrigerator 3 to 30°F (-5 to -1°C) 90 15 3 to 5°F (0 to 11°C) 150 15 Freezer -13 to +19°F (-5 to -7°C) 30 30 c) Automatic Corrections Made During Energy Saving Operating Mode (1) Temperature Display Correction When the unit is in energy saving mode and the evapo[...]

33 III. 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 Alarm Code Problem Notes E1 High Temperature Alarm Cabinet temperature has e[...]

34 1. Alarm Display Priority If multiple alarms occur simultaneously, only the alarm with the higher priority is displayed. Error Code Priority Description ED 1 EEPROM Verication or Read Error Alarm EA  EEPROM Write Error Alarm E8 3 Defrost Temperature Sensor Malfunction Alarm E9 4 Clogged Filter Sensor Malfunction Alarm E4 5 High Pressure Al[...]

35 2. Alarm Details and Countermeasures 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 "" ( hours). The value of x can be changed under F3 on the Settings and Diagnostics Menu. (0=No del[...]

36 b. Low Temperature Alarm (E2) If the cabinet temperature drops below the setpoint temperature by 9°F (5°C) or more for more than y minutes, "E" 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=No delay; 1=1 hour) Note: • The low temper[...]

37 c. Defrost Alarm (E3) If the defrost thermistor does not turn off in one hour after defrost begins, "E3" is displayed. When "E3" 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 Caus[...]

38 e. Clogged Filter Alarm (E7) The unit is equipped with a lter for protecting the condenser from dirt, oils, grease, etc. The lter promotes clean condenser surfaces and efcient operation and should be checked twice monthly and cleaned when necessary. The unit is also equipped with a sensor to determine if this lter is excessively dirt[...]

39 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)), "E8" is displayed. "E8" is also displayed when input from the defrost thermistor is above the defrost thermistor short circuit detection point (equivalent[...]

40 g. Clogged Filter Sensor Malfunction Alarm (E9) If the input from the clogged lter sensor is below the clogged lter sensor open circuit detection point (equivalent to -7.6°F (-°C)), "E9" is displayed. "E9" is also displayed when input from the clogged lter sensor is above the clogged lter sensor short circ[...]

41 h. Control Board Error Alarms (EA and ED) "EA" is displayed when an EEPROM write error is detected. "ED" is displayed when an EEPROM verication or read error is detected. Reset Options Replacing the control board with a functioning replacement control board will eliminate this error condition.[...]

4 B. Diagnosis Chart Problem Possible Cause Remedy [1] Compressor will not start—no current draw. a) Power Supply 1. "OFF" position. 1. Move to "ON" position. . Loose connection(s). . Tighten or reconnect. 3. Failure. 3. Call electrician. b) Cord and Plug 1. Defective. 1. Replace. c) Circuit Breaker (kitchen) 1. Tripp[...]

43 Problem Possible Cause Remedy [5] Cabinet temperature too high. a) Setpoint and/or Differential 1. Incorrect. 1. Correct setting(s). See sections "II.D..b)" and "II.D.3.c)" for defaults. b) Door 1. Not sealing, opened frequently or open for long intervals. 1. Check for sealing, check for door open at time of warm cabinet t[...]

44 Problem Possible Cause Remedy [9] Defrost cycle lasts too long. a) Defrost Thermistor 1. Defective. 1. Replace. b) Control Board 1. Defective. 1. Replace. c) Defrost 1. Not enough defrosts occurring per day. Operation in humid conditions. 1. Factory default is once every 6 hours. If coil is frosting too much, can shorten defrost interval. d) Def[...]

45 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. Clogged Filter Thermistor T-R Curve Cabinet &[...]

46 IV. Removal and Replacement of Components IMPORTANT 1. Ensure all components, fasteners, and thumbscrews are securely in place after the equipment is serviced. . 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[...]

47 1) 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 ow. ) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 t[...]

48 B. Removal and Replacement of Refrigeration Unit 1) Turn off the power supply, and unplug the unit. ) 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 hex-head M6 attachment nuts and the M5 bolt. 4) Very carefully slide out the refrigera[...]

49 1) Turn off the power supply, and unplug the unit. ) 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 hex-head M6 attachment nuts and the M5 bolt. 4) Very carefully slide out the refrigeration system. Support the evaporator as it clears [...]

50 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 4×8 T screws holding the evaporator to the evaporator bracket and provide a safe means for supporting the evaporator away from the ABS liner of the[...]

51 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 on the drier in the direction of the refrigerant ow. 1) Turn of[...]

5 F. Removal and Replacement of Thermistors 1) Turn off the power supply, and unplug the unit. ) 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 hex-head M6 attachment nuts and the M5 bolt. 4) Very carefully slide out the refrigeration [...]

53 G. 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 rst, then working toward the center at the top, bottom and sides. [...]

54 I. 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 c[...]

55 J. Removal and Replacement of Fan Motors 1) Turn off the power supply, and unplug the unit. ) 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 hex-head M6 attachment nuts and the M5 bolt. 4) Very carefully slide out the refrigeration sys[...]

56 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. . 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 wat[...]

57 5. Air Filter As the air lter becomes clogged with dirt or dust, the unit’s performance will be reduced. Do not operate the unit with the air lter removed. This will accelerate clogging of the condenser and result in failure. Check the lter at least twice each month. If it is dirty, use warm water and a neutral cleaner to wash the [...]

58 VI. Wiring Diagrams A1. HUR40A, HWR40A (auxiliary code Q5 and earlier) 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, conrm that you have the proper wiring diagram by checking against the di[...]

59 A2. HUR40A(-D), HWR40A(-D) (auxiliary code Q6 and later) 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, conrm that you have the proper wiring diagram by checking against the diagram located [...]

60 B. HUF40A(-D), HWF40A(-D) 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, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel. 115/60/[...]

61 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, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel. C1. HUR68A, HWR68A (auxiliary cod[...]

6 CAUTION Before diagnosing and/or servicing the unit, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel. 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. C2. HUR68A(-D), HWR68A(-D) (aux[...]

63 CAUTION Before diagnosing and/or servicing the unit, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel. 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. D. HUF68A(-D), HWF68A(-D) 115/60/[...]

64 CAUTION Before diagnosing and/or servicing the unit, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel. 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. E. HUR96A(-D), HWR96A(-D) 115/60/[...]