Instruction/ maintenance manual of the product HWR68A(-D) Hoshizaki
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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.
IMPORTANT Only qualied 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 qualied service technicians in the service and maintenance of the unit.
3 CONTENTS I. Specications ..................................................................................................................... 5 A. Nameplate Ratings ................................................................................
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.
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 V.
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.
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.
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.
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 .
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.
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 .
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.
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.
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.
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.
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.
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.
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.
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 D.
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.
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.
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.
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.
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.
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) .
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.
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 Verication or Read Error Alar.
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).
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.
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.
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 efcient operation and should be checked twice monthly and cleaned when necessary.
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.
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.
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 verication 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel.
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, conrm that you have the proper wiring diagram by checking against the diagram located inside the front panel.
6 CAUTION Before diagnosing and/or servicing the unit, conrm 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.
63 CAUTION Before diagnosing and/or servicing the unit, conrm 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.
64 CAUTION Before diagnosing and/or servicing the unit, conrm 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.
An important point after buying a device Hoshizaki HWR68A(-D) (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Hoshizaki HWR68A(-D) yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Hoshizaki HWR68A(-D) - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hoshizaki HWR68A(-D) you will learn all the available features of the product, as well as information on its operation. The information that you get Hoshizaki HWR68A(-D) will certainly help you make a decision on the purchase.
If you already are a holder of Hoshizaki HWR68A(-D), but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Hoshizaki HWR68A(-D).
However, one of the most important roles played by the user manual is to help in solving problems with Hoshizaki HWR68A(-D). Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hoshizaki HWR68A(-D) along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
