Hoshizaki HUF40A Service Manual Download Page 22

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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 132
Manual
Defrost

LED 123
Lit for
Negative
Values

LED 124
Temperature
and Alarm
Display

(brown) Compressor Relay

(red) Evaporator Fan Relay

(orange) Defrost Heater Relay

Relay Wiring Harness (K311)

Thermistor Wiring Harness (K151)

Front

K311 (6 pin)
Relay Wiring
Harness

K251 (5 pin)
(not used)

K101 (3 pin)
Transformer

K151 (10 pin)
Thermistor
Wiring
Harness

K361 (9 pin)
(not used)

F101
3 Amp Fuse
(not used)

Relays
(not used)

Chip Revision

Board Part
Number

Rear

(gray) Clogged 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

Summary of Contents for HUF40A

Page 1: ...odels 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 2008 SERVICE MANUAL ...

Page 2: ...i 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 pro...

Page 3: ...iagnostics 23 1 Gaining Access to Settings and Diagnostics 23 2 Temperature Display 24 a Switching the Display Between Fahrenheit and Celsius F5 24 b Adjusting the Setpoint Temperature 24 c Cabinet Temperature Correction calibration factor 25 3 Settings and Diagnostics Menu 26 a Defrost Interval F0 27 b Defrost Termination Temperature F1 27 c Setpoint Temperature Differential F2 28 d High Temperat...

Page 4: ...ry 46 2 Brazing 46 3 Evacuation and Recharge 47 B Removal and Replacement of Refrigeration Unit 48 C Removal and Replacement of Compressor 48 D Removal and Replacement of Evaporator 49 E Removal and Replacement of Capillary Tube Suction Line Assembly 51 F Removal and Replacement of Thermistors 52 G Removal and Replacement of Door Gasket 53 H Removal and Replacement of Defrost Heater 53 I Removal a...

Page 5: ...esign Pressure PSIG Refrigerant oz Model AC Supply Voltage Amperes HI LO 404A 134a HUR40A D HWR40A D 115 60 1 5 0 240 120 15 2 HUR68A D HWR68A D 115 60 1 5 0 240 120 15 2 HUR96A D HWR96A D 115 60 1 6 0 240 120 15 2 HUF40A D HWF40A D 115 60 1 5 5 450 250 14 1 HUF68A D HWF68A D 115 60 1 10 0 450 250 13 0 Model Door Opening mm Total Refrigerated Volume ft3 Total Shelf Space ft2 Hotel Pan Capacity D W...

Page 6: ...6 Units mm in 1a HUR40A D HUF40A D 1 HUR40A HUF40A ...

Page 7: ...7 2 HWR40A HWF40A Units mm in 2a HWR40A D HWF40A D ...

Page 8: ...8 3 HUR68A HUF68A Units mm in 3a HUR68A D HUF68A D ...

Page 9: ...9 4 HWR68A HWF68A Units mm in 4a HWR68A D HWF68A D ...

Page 10: ...10 5 HUR96A 5a HUR96A D Units mm in ...

Page 11: ...11 6a HWR96A D 6 HWR96A Units mm in ...

Page 12: ...ator Assembly Access Valve Low Side Cabinet Thermistor Thermal Fuse Evaporator Case Cover Evaporator Fan Motor Evaporator Defrost Heater Defrost Thermistor Evaporator Shroud Defrost Thermostat Evaporator Case II General Information A Construction Hoshizaki undercounters feature a cartridge type refrigeration unit that can be removed without taking off the top and side panels ...

Page 13: ...s on 2 Frame heater s on Q6 and later One minute after evaporator fan start up dF no longer displayed cabinet temperature displayed Board Self Check 1 Frame heater s on 2 Evaporator fan s on POWER 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 Continue as normal cycling Cycle On Cut on te...

Page 14: ... C n s a F r o t a r o p a v E r e t a e H t s o r f e D n i m 2 y a l e D t r a t S N O r e w o P e m i T s r u o h 6 e l b a t s u j d A t r a t S t s o r f e D n i m 5 y a l e D n i a r D n i m 5 y a l e D n a F r o t a c i d n I t s o r f e D n i m 1 y a l e D y a l p s i D n i m 2 N O n i M n i m 2 F F O n i M e r u t a r e p m e T n o i t a n i m r e T t s o r f e D n i m 0 6 n o i t a r u D...

Page 15: ...ter evaporator fan start up dF no longer displayed cabinet temperature displayed Board Self Check 1 Frame heater s on 2 Evaporator fan s on POWER 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 Continue as normal cycling Cycle On Cut on temperature reached Minimum 2 minutes 1 Compressor st...

Page 16: ...r o p a v E e t a e H t s o r f e D r n i m 2 y a l e D t r a t S N O r e w o P e m i T s r u o h 6 e l b a t s u j d A t r a t S t s o r f e D n i m 5 y a l e D n i a r D n i m 5 y a l e D n a F o t a c i d n I t s o r f e D r n i m 8 y a l e D y a l p s i D n i m 2 N O n i M n i m 2 F F O n i M e r u t a r e p m e T n o i t a n i m r e T t s o r f e D n i m 0 6 n o i t a r u D t s o r f e D x a ...

Page 17: ...pressor start up 1 Evaporator fan s on 2 Frame heater s on Q6 and later 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 POWER ON 2 minute Delay 1 Compressor start up 2 Condenser fan start up 3 Frame heater s on continuously 4 Evaporator fan s on continuously Cycle Off Cut out temperature reached Mini...

Page 18: ... i m 5 y a l e D n a F r o t a c i d n I t s o r f e D n i m 1 y a l e D y a l p s i D e r u t a r e p m e T n o i t a n i m r e T t s o r f e D n i m 0 6 n o i t a r u D t s o r f e D x a M t n e t t i m r e t n I n o i t a r e p O s d o i r e P F F O r o s s e r p m o C l l A t n e t t i m r e t n I n o i t a r e p O s d o i r e P F F O r o s s e r p m o C l l A TIME TEMPERATURE CONTROL CHART DU...

Page 19: ...n 2 Evaporator fan s cycles on and off POWER ON 2 minute Delay 1 Compressor start up 2 Condenser fan start up 3 Evaporator fan s on continuously Cycle Off Cut out temperature reached Minimum 2 minutes 1 Compressor off 2 Condenser fan off 3 Evaporator fan s cycles on and off Continue as normal cycling Cycle On Cut on temperature reached Minimum 2 minutes 1 Compressor start up 2 Condenser fan start ...

Page 20: ...O r e w o P e m i T s r u o h 6 e l b a t s u j d A t r a t S t s o r f e D n i m 5 y a l e D n i a r D n i m 5 y a l e D n a F r o t a c i d n I t s o r f e D n i m 8 y a l e D y a l p s i D e r u t a r e p m e T n o i t a n i m r e T t s o r f e D n i m 0 6 n o i t a r u D t s o r f e D x a M t n e t t i m r e t n I n o i t a r e p O s d o i r e P F F O r o s s e r p m o C l l A t n e t t i m r ...

Page 21: ...ield Always replace the whole board assembly if it goes bad 5 Do not short out power supply to test for voltage 6 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 Start Up Delay The start circuit of the compressor is timed such that at power up and during any compress...

Page 22: ... red Evaporator Fan Relay orange Defrost Heater Relay Relay Wiring Harness K311 Thermistor Wiring Harness K151 Front K311 6 pin Relay Wiring Harness K251 5 pin not used K101 3 pin Transformer K151 10 pin Thermistor Wiring Harness K361 9 pin not used F101 3 Amp Fuse not used Relays not used Chip Revision Board Part Number Board Part Number Rear gray Clogged Filter Sensor orange Defrost Thermistor b...

Page 23: ...ration of the unit 1 Gaining Access to Settings and Diagnostics Generally the only two settings that can change are the temperature display scale F or 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...

Page 24: ...t 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 compressor turns on To set the setpoint temperature follow the steps below 1 Press the button to display the current setpoint temper...

Page 25: ...ssing the up button The current correction calibration factor will be shown If 18 is displayed the value is 1 8 F 1 0 C See the table below for the default values 2 If it is determined through discussion with the factory that the setting needs to be changed press the up or 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 T...

Page 26: ... 0 F 36 F 2 0 2 0 C decimal is not displayed F3 High Temperature Alarm Delay Time 0 to 180 minutes in 60 minute increments 0 0 1 60 2 120 3 180 minutes 2 2 2 F4 Low Temperature Alarm Delay Time 0 or 60 minutes 0 0 1 60 minutes 1 1 1 F5 Temperature Dis play Fahrenheit or Celsius F F F F6 Alarm History Displays alarm history maximum 8 alarms NA NA NA F7 Compressor Run Time Displays run time between ...

Page 27: ...ting 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 temp...

Page 28: ...nk button for 5 seconds F0 should appear in the display window Press the MANUAL DEFROST button until F2 appears in the display window 3 Press the unmarked blank button to display the current setting the decimal between the digits is not shown Press the up or down button to increase or decrease the plus differential in 9 F increments Note Both the and values can be adjusted between 0 0 and 6 3 F in...

Page 29: ...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 e Low Temperature Alarm Delay Time F4 To change the low temperature alarm delay time follow the steps below 1 Make sure the jumper...

Page 30: ...he 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 4 To reset the alarm history...

Page 31: ...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 the chart below Continuous no period after temperature Energy Saving period after temperature Model Default Setting Refrigerator auxiliary code Q5 and ear...

Page 32: ...nds 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...

Page 33: ... Control board has terminated defrost E3 may alternate with dF instead of the temperature E4 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 Clean filter if necessary Allow time for pressure switch to react then turn power off and back on again to reset If switch trip...

Page 34: ...ror Code Priority Description ED 1 EEPROM Verification or Read Error Alarm EA 2 EEPROM Write Error Alarm E8 3 Defrost Temperature Sensor Malfunction Alarm E9 4 Clogged Filter Sensor Malfunction Alarm E4 5 High Pressure Alarm E7 6 Clogged Filter Alarm E3 7 Defrost Alarm E1 8 High Temperature Alarm E2 9 Low Temperature Alarm ...

Page 35: ... 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 Th...

Page 36: ...ngs and Diagnostics Menu 0 No delay 1 1 hour Note The low temperature alarm timer starts once the cabinet temperature drops 9 F 5 C below the setpoint temperature The 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 T...

Page 37: ...ge d High 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 ...

Page 38: ...f 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 The condenser air filter is dirty The condenser fan motor is locked or otherwise not functioning IMPORTANT If this alarm occurs frequently the compressor discharge temperature...

Page 39: ...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 thermistor...

Page 40: ...he 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 sensor exceeds the open circuit detection point equivalent to 7 6 F 22 C T...

Page 41: ... is displayed when an EEPROM write error is detected ED is displayed when an EEPROM verification or read error is detected Reset Options Replacing the control board with a functioning replacement control board will eliminate this error condition ...

Page 42: ...eplace k Compressor 1 Open windings 1 Check continuity and replace l Relay Condensing Unit 1 Bad contacts 1 Replace 2 Open coil winding 2 Check and replace 2 Compressor will not run draws current and trips on overload a Voltage 1 Too low 1 Call electrician b Start Relay 1 Bad contacts 1 Replace 2 Open coil windings 2 Replace c Compressor 1 Locked rotor 1 Replace d Start Capacitor 1 Defective 1 Che...

Page 43: ...emperature display indicator does not illuminate properly a Power Supply 1 OFF position 1 Move to ON position 2 Loose connection s 2 Tighten or reconnect 3 Failure or tripped breaker 3 Call electrician and or reset breaker b Control Board 1 Defective 1 Replace 7 Cabinet temperature too low a Setpoint and or Differential 1 Incorrect 1 Correct setting s See sections II D 2 b and II D 3 c for default...

Page 44: ...of large volumes of warm moist uncovered product 1 Cover product with plastic wrap b Location of Unit 1 Unit located near high humidity source such as fryer steamer etc 1 Relocate c Seals 1 Poor sealing around evaporator door gaskets 1 Adjust or replace d Environment 1 Extreme environment and door opening conditions 1 Adjust conditions 11 Abnormal Noise a Fasteners 1 Loose fasteners allow vibratio...

Page 45: ...stor 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 5kΩ for the cabinet and defrost thermistors and 145 to 175kΩ for the clogged filt...

Page 46: ...d 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 ...

Page 47: ...ts 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 Close the low side service manifold valve 5 ...

Page 48: ...tion 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 re...

Page 49: ...t 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 R 404A 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 ...

Page 50: ... 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 blocke...

Page 51: ...BS 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 blocke...

Page 52: ... 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 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 re...

Page 53: ...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 the evaporator case 5 Remove the connection lead wire for the defrost heater 6 Remove the two 4 8 T2 evaporator shroud screws above each end of ...

Page 54: ...e 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 4 8 T2 screw securing the bottom control box bracket to the evaporator case cover 5 Remove...

Page 55: ... 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 a defrost Use gloves when handling and avoid touching t...

Page 56: ...hol 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 2 Use clean cloth and hands for cleaning 3 Before cleaning the cabinet interior move the stored foods into another clean r...

Page 57: ...e 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 ov...

Page 58: ...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 115 60 1 Transformer Output 10V at 115V ...

Page 59: ...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 115 60 1 Transformer Output 10V at 115V ...

Page 60: ...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 115 60 1 Transformer Output 10V at 115V ...

Page 61: ...s 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 C1 HUR68A HWR68A auxiliary code Q5 and earlier 115 60 1 Transformer Output 10V at 115V ...

Page 62: ...agram 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 auxiliary code Q6 and later 115 60 1 Transformer Output 10V at 115V ...

Page 63: ...oper 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 1 Transformer Output 10V at 115V ...

Page 64: ...oper 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 1 Transformer Output 10V at 115V ...

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