Hoshizaki HR-MA Series Service Manual
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Hoshizaki HR-MA Series Service Manual

Hoshizaki HR-MA Series Service Manual

Commercial refrigerator/freezer
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COMMERCIAL REFRIGERATOR/FREEZER
SERVICE MANUAL
HR-MA series
HF-MA series
HRF-MA series
R590-1053 (022125)

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Summary of Contents for Hoshizaki HR-MA Series

  • Page 1 COMMERCIAL REFRIGERATOR/FREEZER HR-MA series HF-MA series HRF-MA series SERVICE MANUAL R590-1053 (022125)

  • Page 2: Table Of Contents

    CONTENTS PAGE I. GENERAL INFORMATION -------------------------------------------------------------------------- 1 1. SAFETY INSTRUCTIONS ------------------------------------------------------------------------- 1 2. DIMENSIONS/SPECIFICATIONS --------------------------------------------------------------- 3 [a] HR-78MA(Model Code: R590) ------------------------------------------------------------- 3 [b] HR-128MA(Model Code: R591) ------------------------------------------------------------ 4 [c] HR-148MA(Model Code: R592) ------------------------------------------------------------ 5 [d] HR-188MA(Model Code: R593) ------------------------------------------------------------ 6 [e] HF-78MA(Model Code: R594) -------------------------------------------------------------- 7 [f] HF-128MA(Model Code: R595) ------------------------------------------------------------ 8 [g] HF-148MA(Model Code: R596) ------------------------------------------------------------ 9...
  • Page 3 III. SERVICE DIAGNOSIS ----------------------------------------------------------------------------- 38 1. ERROR CODES ------------------------------------------------------------------------------------ 38 2. FLOWCHART -------------------------------------------------------------------------------------- 39 [a] HR SERIES, HRF SERIES - REFRIGERATOR -------------------------------------------- 39 [b] HF SERIES, HRF SERIES - FREEZER ----------------------------------------------------- 40 3. COMPONENTS ------------------------------------------------------------------------------------ 41 4. CONTROLLER ------------------------------------------------------------------------------------- 43 [a] SERVICING CONTROLLER ----------------------------------------------------------------- 43 [b] CHECKING THERMISTOR ------------------------------------------------------------------ 44 IV.
  • Page 4 Explanation for Model Name * * * * * Product Classification Door Type Auxiliary Mark P：Pass through HR：Refrigerator H：Half door tpye HF：Freezer L：Long door tpye L：All left door R： HRF：Refrigerator/Freezer S：Glass door tpye All right door ML：Mullion less Power Supply type E：Forced evaporation Null：Chinese Plug(220V±10% 50Hz) N：NSF...

  • Page 5: General Information

    I. GENERAL INFORMATION 1. SAFETY INSTRUCTIONS The following instructions contain important safety precautions and should be strictly observed. The terms used here are defined as follows: WARNING: There is a possibility of death or serious injury to the service person and a third party or the user due to improper service operations or defects in serviced products.
  • Page 6 cannot be located, be sure to check again for further leaks after recharging the refrigerant. Leaked refrigerant may produce a poisonous gas when coming in contact with an open flame of a gas cooking stove or a fan heater. (7) Before servicing, check the surface temperature of the refrigeration circuit to prevent a burn.

  • Page 7: Dimensions/Specifications

    2. DIMENSIONS/SPECIFICATIONS *Representative (standard) models only [a] HR-78MA(Model Code: R590)
  • Page 8 [b] HR-128MA(Model Code: R591)

  • Page 9: [C] Hr-148Ma(Model Code: R592)

    [c] HR-148MA(Model Code: R592)

  • Page 10: [D] Hr-188Ma(Model Code: R593)

    [d] HR-188MA(Model Code: R593)

  • Page 11: [E] Hf-78Ma(Model Code: R594)

    [e] HF-78MA (Model Code: R594)

  • Page 12: [F] Hf-128Ma(Model Code: R595)

    [f] HF-128MA (Model Code: R595)

  • Page 13: [G] Hf-148Ma(Model Code: R596)

    [g] HF-148MA (Model Code: R596)

  • Page 14: [H] Hf-188Ma(Model Code: R597)

    [h] HF-188MA (Model Code: R597)

  • Page 15: [I] Hrf-78Ma(Model Code: R598)

    [i] HRF-78MA (Model Code: R***)

  • Page 16: [J] Hrf-128Ma(Model Code: R599)

    [j] HRF-128MAF(Model Code: R599)

  • Page 17: [K] Hrf-148Ma(Model Code: R600)

    [k] HRF-148MAF (Model Code: R600)

  • Page 18: [L] Hrf-188Ma(Model Code: R601)

    [l] HRF-188MAF (Model Code: R601)

  • Page 19: [B] Hr-128Ma(Model Code: R591)

    II. TECHNICAL INFORMATION 1. WIRING DIAGRAM *Standard models: model names and model codes for representative models only [a] HR-78MA (Model Code: R590) [b] HR-128MA (Model Code: R591) HR-148MA (Model Code: R592)、HR-188MA (Model Code: R593) 　： FOR 6 DOOR MODELS...

  • Page 20: [C] Hf-78Ma(Model Code: R594)

    [c] HF-78MA (Model Code: R594）...

  • Page 21: [D] Hf-128Ma(Model Code: R595)

    [d] HF-128MA (Model Code: R595） HF-148MA (Model Code: R596) [e] HF-188MA (Model Code: R597)
  • Page 22 [f] HRF-78MA (Model Code: R598)

  • Page 23: [G] Hrf-128Ma(Model Code: R599)

    [g] HRF-128MAF (Model Code: R599) HRF-148MAF (Model Code: R600)

  • Page 24: [H] Hrf-188Ma(Model Code: R601)

    [h] HRF-188MAF (Model Code: R601)

  • Page 25: [F] Hrf-78Ma(Model Code: R598)

    2. REFRIGERATION CIRCUIT HR/HF Compressor Heat Exchange Evaporator Drier Compressor (Freezer) Heat Exchange HRF-78MA Evaporator Drier Compressor (Refrigerator) Heat Exchange Refrigerant: HFC-134a (HR series) (HRF refrigerator) Evaporator Drier HFC-404A (HF series) (HRF freezer) There may be exceptions for some customized models.
  • Page 26 HRF-128,148,188MAF Compressor (Refrigerator) Heat Exchange Evaporator Drier Compressor (Freezer) Heat Exchange Evaporator Drier...

  • Page 27: Electronic Controls

    3. ELECTRONIC CONTROLS [a] SET POINT TEMPERATURE (compressor OFF temperature) Heater defrost (HR series,): -6 to +12° C Heater defrost (HF series, HRF series - freezer): -23 to -7° C Average Cabinet Temperature Time Set Point Temperature Compressor [b] CABINET TEMPERATURE DIFFERENTIAL 4 K (from “set point temp”...

  • Page 28: [F] Compressor Soft Start

    [f] COMPRESSOR SOFT START 1) Startup Power ON 3 min Compressor Condenser Fan Motor Cabinet Temp Display 1 min Interior Fan Motor When the power supply is turned on, the screen shows the cabinet temperature and the interior fan motor starts up with a 1 minute delay. The compressor and condenser fan motor start up with a 3 minute delay.

  • Page 29: [H] Checking Set Point Temperature

    [h] CHECKING SET POINT TEMPERATURE Note: See “5. CONTROLLER” for the operation panel key locations. Press and hold the set key on the operation panel for 3 seconds to display “St” on the screen. Press the set key again to display the set point temperature on the screen. After 30 seconds, the screen displays the cabinet temperature again.

  • Page 30: [I] Manual Defrost

    [i] MANUAL DEFROST To start the manual defrost cycle, press the defrost/rest key for 3 seconds. The defrost indicator light on the operation panel comes on when the defrost cycle starts. [j] ERROR CODES HR series, HF series, HRF series Code Possible Cause Operation and Remedy...

  • Page 31: Timing Chart

    4. TIMING CHART [a] STARTUP - CONTROL...

  • Page 32: [B] Defrost

    [b] DEFROST Note: HF series, HRF series - freezer drain for 10 minutes, and HR series drain for 5 minutes.

  • Page 33: Indicator Lights

    5. CONTROLLER [1] Refrigeration Indicator Light [2] Defrost Indicator Light [3] Fan Indicator Light [4] Defrost dripping Indicator Light [5] Set Indicator Light [6] Defrost/Reset Key [7] Down Key [8] Up Key [9] Set Key/Menu Key Operation Panel Indicator Lights Indicator Light Symbol Status...
  • Page 34 Parameters Setting Menu Functions Setting range Default Unit Temperature set value Upper limit ～ Lower limit 4℃ -20℃ 1℃ ℃ / ℉ Administrator menu password is 55 unmodified ） Password 0.5℃～ 9.0℃ Hysteresis value 4.0℃ 4.0℃ 4.0℃ ℃ / ℉ 1 ℉～...
  • Page 35 0℃～ 50℃ 30℃ 20℃ Defrost termination HF188: HRF-R ： 12℃ ℃ / ℉ 32 ℉～ 122 ℉ temperature 20℃ 5℃ 0 ～ 60 Dripping time after defrost 0:Defrost dripping time forbidden Cabinet temperature display 0 ～ 90 HF-188:10 time delay after defrost 0 ～...
  • Page 36 Cabinet temperature upper Cabinet temperature lower limit 24℃ 85℃ 85℃ ℃ / ℉ limit alarm value alarm value ～ 185 ℉～ 85℃ Cabinet over temperature 0 ～ 60 3min alarm time delay The initial cabinet over temperature alarm time 0 ～ 60 3min delay after electrified Over temperature alarm...
  • Page 37 1、Keys operation 1）Parameter Adjustment In the status of temperature measuring and controlling, press Set key for three seconds to enter user menu, it displays the code St, then press Set key again, display the value of St. It could be modified by pressing the key When it displays the code St，press the key ，display the code Po，then press Set key, display 00，at this time, press...
  • Page 38 3.Control output 3.1Compressor Normal status When the cabinet temperature is higher than the set temperature (St) + hysteresis (C1), and finish the compressor start Min. interval, the compressors will start ； When the cabinet temperature is lower than the set temperature (St), and the continuous refrigeration running time is large than C8, the compressor will close.
  • Page 39 this time period. After finishing dripping time after defrost, it enters to the status of refrigeration cycle. Note: Defrost status display d5=0: Display cabinet temperature d5=1: Display dEF during defrost and defrost time delay, display cabinet temperature after finishing defrost time delay. d5=2: Always display dEF during defrost and defrost dripping.
  • Page 40 deviation (A9)), and cabinet over temperature alarm time delay has been finished, the digital tube will display rH, and the alarm will not be released until the temperature is lower than (set value (St)+ over temperature alarm upper deviation (A9)); When the cabinet temperature is lower than (set value (St)- over temperature alarm lower deviation(A10)) and cabinet over temperature alarm time delay has been finished, the digital tube will display rL and the alarm will not be released until the temperature is...

  • Page 41: Wiring Diagram

    Wiring Diagram...

  • Page 42: Service Diagnosis

    III. SERVICE DIAGNOSIS 1. ERROR CODES Display Error Possible Cause Reset Interior thermistor • Interior • Automatically defective thermistor circuit resets after cause is shorted, dusty removed connector Defrost thermistor • Defrost • Automatically defective thermistor circuit resets after cause is shorted, dusty removed connector...

  • Page 43: Flowchart

    2. FLOWCHART [a] HR SERIES, HRF SERIES - REFRIGERATOR PROBLEM PROBLEM POSSIBLE CAUSE (numbers corresponding to "3. COMPONENTS") No refrigeration Compressor will not start No temp indication [1] Safety Breaker [2] Controller Open circuit, connector unplugged E1 error indication [4] Interior Thermistor Abnormal resistance, bad contact No error indication [4] Interior Thermistor...

  • Page 44: [B] Hf Series, Hrf Series - Freezer

    [b] HF SERIES, HRF SERIES - FREEZER PROBLEM PROBLEM POSSIBLE CAUSE (numbers corresponding to "3. COMPONENTS") No refrigeration Compressor will not start No temp indication [1] Safety Breaker [2] Controller Open circuit, connector unplugged No error indication [4] Interior Thermistor Abnormal resistance, bad contact [7] Pressure Switch Defective...

  • Page 45: Components

    PROBLEM PROBLEM POSSIBLE CAUSE (numbers corresponding to "3. COMPONENTS") Excessive Compressor runs continuously High temp indication [4] Interior Thermistor Location refrigeration Normal temp indication [4] Interior Thermistor Abnormal resistance [2] Controller Defective Compressor stops No error indication Cold air outlet loaded Cold air inlet blocked Ambient temp too low E1 error indication...
  • Page 46 Location (plug in from evaporator back) Disconnected, replaced with interior Correct thermistor, etc Condenser Immerse in ice water to check resistance Abnormal resistance Thermistor (25 - 30k) Replace if necessary Clean/dry connector Short circuit (temp displayed as "E3") Replace Open circuit (temp displayed as "E3") Replace Abnormal noise Replace...

  • Page 47: Controller

    4. CONTROLLER [a] SERVICING CONTROLLER 1) When receiving a service call, ask the user to turn off the power supply and turn it back on after 30 seconds, while watching the unit. This will reset the controller, and in some cases normal operation will resume. 2) Keep the following in mind when servicing the controller: * Check that the unit has been earthed properly.

  • Page 48: [B] Checking Thermistor

    [b] CHECKING THERMISTOR 1) Remove the thermistor from the controller. 2) Put ice and water in a glass or other container to make 0° C water. Immerse the thermistor bulb in the water for 5 minutes (at the center of the container). 3) Use the Ω...

  • Page 49: Removal And Replacement Of Components

    IV. REMOVAL AND REPLACEMENT OF COMPONENTS 1. CONTROLLER AND THERMISTOR [a] CONTROLLER 1) Unplug the unit. 2) Loosen the screw at the rear. 3) Remove the two screws at both sides to take off the control box cover. 4) Use a precision screwdriver to remove the wiring cover and wiring.
  • Page 50 3. If the defrost thermistor color is not white, wind white vinyl tape around the thermistor as shown below for indication. Vinyl Tape Sensor (White) Terminal Side Interior Thermistor Bulb Location Defrost Thermistor Bulb Location HRF-128,148,188MAF - refrigerator HRF-78MA, 128,148,188MAF - freezer...
  • Page 51 HRF-78MA - refrigerator Defrost Thermistor Interior Thermistor...

  • Page 52: Refrigeration Circuit

    2. REFRIGERATION CIRCUIT For HRF-78MA, it is structurally difficult to replace the whole refrigeration circuit. Replace the individual parts. [a] COMPRESSOR 1) Unplug the unit. 2) Remove the front panel. 3) Remove the top panel. 4) Remove the protector cover enclosing the electrical parts. Remove the overload relay, starting relay, and other parts.

  • Page 53: [C] Evaporator

    [c] EVAPORATOR 1) Unplug the unit. 2) Remove the front panel. 3) Recover the refrigerant from the low side access valve. 4) Remove the insulation hoses on the refrigeration unit base. Disconnect the evaporator using brazing equipment. 5) Remove the air duct. 6) Disconnect the defrost heater wires.

  • Page 54: [E] Defrost Heater And Thermal Fuse

    [e] DEFROST HEATER AND THERMAL FUSE 1) Unplug the unit. 2) Disconnect the defrost heater at the back of the refrigeration unit. The defrost heater and thermal fuse are connected in series and interchangeable without any operational problems. 3) Remove the putty from the wire hole in the refrigeration unit base, and put the connector through the hole.

  • Page 55: Air Duct

    3. AIR DUCT [a] AIR DUCT 1) Remove the screws securing the air duct. 2) Hold both sides of the air duct, and pull it out towards you. The air duct for the HF series is provided with a gasket in the drain pipe and must be pulled hard to remove. 3) To prevent tension on the wires, place the removed air duct on a shelf.

  • Page 56: [B] Interior Fan Motor (Except Hrf-78Ma)

    [b] INTERIOR FAN MOTOR (Except HRF-78MA) 1) Unplug the unit. 2) Disconnect the interior fan motor connector beside the refrigeration unit. 3) Unscrew the refrigeration unit. 4) Slightly lift up the refrigeration unit, and put the interior fan motor leads inside the cabinet.

  • Page 57: [C] Interior Fan Motor (Hrf-78Ma)

    [c] INTERIOR FAN MOTOR (HRF-78MA) 1) Unplug the unit. 2) Open the door to the refrigerator. Unscrew and remove the cooling duct. 3) Unscrew and remove the interior fan motor assembly. 4) Remove the screws securing the interior fan motor to the bracket, and take off the interior fan motor.

  • Page 58: Door Parts

    4. DOOR PARTS [a] HINGE SPACER For door closing adjustment, the hinge spacers may be provided between the hinges and cabinet. When removed, the hinge spacers must be reinstalled in the correct position. When the door is replaced or the gasket is often caught in the door, order the following parts and replace the hinge spacers: Hinge Spacer 473352M01...

  • Page 59: Condenser Cleaning Pan

    5. CONDENSER CLEANING PAN The condenser is designed to allow the cleaning pan at the bottom. * Insert the cleaning pan (wastewater pan), and connect the drain hose to the drain outlet. Use the cleaning pan (A) for the 280 mm wide condenser [HR / HRF- 78/128/148/188, HF-78], and connect the cleaning pan (A) and cleaning pan (B) for the 500 mm wide condenser [HF-128/148/188].

  • Page 60: Optional Parts

    6. OPTIONAL PARTS [a] HINGE KIT The door hinges for HR-78MA, HF-78MA and HRF-78MA can be moved to the other side of the door by using the following hinge kit. Hinge Kit (R) Door Hinge (R) - Lo 375316G01 1 pc Door Hinge (R) - Up 375317G01 1 pc...

This manual is also suitable for:

Hf-ma seriesHrf-ma seriesHr-78maHr-128maHr-148maHr-188ma ... Show all

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