Hoshizaki SafeTemp FH1-AAC Service Manual
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Hoshizaki SafeTemp FH1-AAC Service Manual

Hoshizaki SafeTemp FH1-AAC Service Manual

Commercial refrigerators & freezers
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Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Commercial Refrigerators & Freezers
Models
SafeTemp
®
SERVICE MANUAL
Number: 73096
Issued: 10-9-2000
Revised: 3-7-2007

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Summary of Contents for Hoshizaki SafeTemp FH1-AAC

  • Page 1 Hoshizaki America, Inc. “A Superior Degree of Reliability” www.hoshizaki.com Commercial Refrigerators & Freezers Models SafeTemp ® SERVICE MANUAL Number: 73096 Issued: 10-9-2000 Revised: 3-7-2007...
  • Page 2 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.

  • Page 3: Table Of Contents

    4. RH3-AAC(-HD) ... 8 II. General Information ... 9 A. Sequence of Operation and Timing Charts ... 9 1. Refrigerator ... 9 . Freezer ... 11 B. Control Module ... 13 1. Settings and Adjustments..13 . Service Menu ... 14 C.
  • Page 4 V. Cleaning Instructions ... 3 VI. Wiring Diagrams ... 33 A. RH1-AAC(-HD) ... 33 B. RH-AAC(-HD) ... 34 C. RH3-AAC(-HD) ... 35 D1. FH1-AAC(-HD) (auxiliary code P-7 and earlier) ... 36 D. FH1-AAC(-HD) (auxiliary code P-8 and later) ... 37 E1.

  • Page 5: Specifications

    I. Specifications A. Nameplate Ratings RH1-AAC / RH1-AAC-HD FH1-AAC / FH1-AAC-HD RH-AAC / RH-AAC-HD FH-AAC / FH-AAC-HD RH3-AAC / RH3-AAC-HD RH1-AAC-W B. Dimensions 1. Notes for All Units 1) Units shipped with 4" casters ) Optional legs have 5.4 mm (1 in.) height adjustment RH1-AAC / FH1-AAC RH1-AAC-HD / FH1-AAC-HD RH-AAC / FH-AAC...

  • Page 6: Rh1-Aac(-Hd), Fh1-Aac(-Hd)

    2. RH1-AAC(-HD), FH1-AAC(-HD) mm (in.) * Shown with optional 6" legs; 4" casters are standard...

  • Page 7: Rh-Aac(-Hd), Fh-Aac(-Hd)

    3. RH2-AAC(-HD), FH2-AAC(-HD) mm (in.) * Shown with optional 6" legs; 4" casters are standard...

  • Page 8: Rh3-Aac(-Hd)

    4. RH3-AAC(-HD) mm (in.) * Shown with optional 6" legs; 4" casters are standard...

  • Page 9: General Information

    II. General Information A. Sequence of Operation and Timing Charts 1. Refrigerator a) Sequence of Operation POWER ON 1. Frame heaters on . Evaporator fan on Cycle On (Cut-on temperature reached) [Minimum .0 minutes] 1. Compressor on . Condenser fan on Note: 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  minute delay before the compressor will start.
  • Page 10 b) Timing Chart For Refrigerator...

  • Page 11: Freezer

    2. Freezer a) Sequence of Operation POWER ON Initiate Defrost 1. Compressor off . Evaporator fan off 3. Condenser fan off 4. Defrost heater on 5. "dEF" displayed 6. Frame heaters on Cycle On (Cut-on temperature reached) [Minimum .0 minutes] 1.
  • Page 12 Timing Chart For Freezer...

  • Page 13: Control Module

    B. Control Module The control module for -AAC models is located on the face of the refrigeration circuit, behind the front panel. To open the front panel, swing the bottom of the panel up and allow the panel hinges to catch securely on the side panel frames in the locked position; the control module can then be accessed.

  • Page 14: Service Menu

    Next display is the minimum allowable setpoint (from the setpoint menu). Indicates that the minimum allowable setpoint is 37°F. Next display is for calibration of the thermistor. Do not adjust, unless replacing thermistors. WARNING Indication Default Refrigerator Freezer -5°F -6°F 55°F 8°F 37°F -10°F...
  • Page 15 WARNING: This value should be adjusted only after consulting with the factory. Next display after these is the maximum allowable time for a defrost. The freezer’s target is to terminate before this value is reached. This value is a safety. (Freezer Only) Indicates that the maximum time for a defrost is 60 minutes.

  • Page 16: Thermistors

    C. Thermistors Thermistors (semiconductors) are used for cabinet temperature control and defrost termination. The resistance varies depending on temperature. No adjustment is required. If necessary, check for resistance between thermistor leads and visually check the thermistor mounting. 1. Cabinet Thermistor (SEN1: white and black leads) This temperature reading can be identified by looking at the temperature shown on the display.

  • Page 17: Compressor Protector

    D. Compressor Protector When a combined temperature/amperage value is above the limit specified by the compressor manufacturer, a protector will operate independently, turning off the compressor. The compressor will restart when this protector has reset. Note: 1. Compressor protector resets automatically. .

  • Page 18: Service Diagnosis

    III. Service Diagnosis A. Diagnosis Chart Problem Possible Cause [1] Compressor will a) Power Supply not start—no current draw. b) Cord and Plug c) Ground Fault Circuit Interrupter d) Transformer e) Wiring to Control Module 1. Loose connection. f) High Pressure Switch g) Thermistor h) Control Module i) Compressor Overload...
  • Page 19 Problem Possible Cause [5] Cabinet temperature a) Setpoint too high. b) Door c) Defrost d) Refrigerant e) Fan Motor f) Air Filter g) Condenser h) Thermistor i) Control Module [6] Cabinet temperature a) Control Module display indicator does not illuminate properly. [7] Cabinet temperature a) Thermistor too low.
  • Page 20 Problem Possible Cause [10] Condensate a) Cabinet Contents water overflow. b) Location of Unit c) Seals d) Environment [11] Abnormal Noise a) Fasteners b) Compressor c) Fan d) Relay Remedy 1. Loading of large 1. Cover product with plastic volumes of warm, moist, wrap.

  • Page 21: Removal And Replacement Of Components

    IV. Removal and Replacement of Components 1. Ensure all components, fasteners and thumbscrews are securely in place after the equipment is serviced. . The Polyol Ester (POE) oils used in R-134a and R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.

  • Page 22: Evacuation And Recharge [R-134A, R-404A]

    5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high- side line. 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. 700-88 be used.

  • Page 23: Removal And Replacement Of Compressor

    B. Removal and Replacement of Compressor 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.

  • Page 24: Removal And Replacement Of Expansion Valve

    C. Removal and Replacement of Expansion Valve Sometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at the expansion valve. 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.

  • Page 25: Removal And Replacement Of Evaporator

    D. Removal and Replacement of Evaporator 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.

  • Page 26: Removal And Replacement Of Door Closure Spring

    F. Removal and Replacement of Door Closure Spring Wear eye protection and use caution when removing the tension screw (step 3). 1) Open the front panel assembly to gain access to the upper hinge brackets. ) Remove the bushing cover from the top of the spring cartridge assembly. Hinge Washer Bushing Cover Spring Cartridge...

  • Page 27: Door Re-Hinging

    G. Door Re-Hinging The door on any unit is reversible as shown below. Depending on the model and door configuration, instructions for re-hinging the door(s) will vary. Instructions for re-hinging are provided in the kits listed below. Convert Right to Left Left to Right Right to Left Left to Right...

  • Page 28: Removal And Replacement Of Control Module

    H. Removal and Replacement of Control Module 1. Both thermistors, cabinet and defrost, must be replaced with the ones supplied by the factory with the replacement control module. . Thermistors are factory calibrated to the new control module. No control module calibration is needed.

  • Page 29: Removal And Replacement Of Thermistors

    I. Removal and Replacement of Thermistors When replacing a faulty thermistor, it is necessary to: a) Verify the control module calibration. b) Replace both the cabinet and defrost thermistors. 1) Unplug the unit from the electrical outlet. ) Remove the panels and the top cover over the evaporator. 3) Open the control box cover.
  • Page 30 3. Calibrate Control Module 15) Make a note of the display temperature. 16) Enter the menu for the control module by pressing the down arrow button and the "°F" button at the same time and release. The display should now read "dIF." Press the "°F" button until it reads "CAL"...
  • Page 31 8) Tie the excess thermistor wire length together and place it behind the control box. 9) Connect all wiring to the control module. Be sure wires are not touching at the terminal block connection. 30) Replace all parts and panels in their correct positions. 31) Plug the unit back in.

  • Page 32: Cleaning Instructions

    V. Cleaning Instructions 1. 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. Interior Spills should be wiped up promptly to avoid unpleasant odors. The cabinet interior should be cleaned periodically with a mild soap or detergent.

  • Page 33: Wiring Diagrams

    VI. Wiring Diagrams A. RH1-AAC(-HD) Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover. CAUTION...

  • Page 34: Rh-Aac(-Hd)

    B. RH2-AAC(-HD) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

  • Page 35: Rh3-Aac(-Hd)

    C. RH3-AAC(-HD) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

  • Page 36: D1. Fh1-Aac(-Hd) (Auxiliary Code P-7 And Earlier)

    D1. FH1-AAC(-HD) (auxiliary code P-7 and earlier) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

  • Page 37: D. Fh1-Aac(-Hd) (Auxiliary Code P-8 And Later)

    D2. FH1-AAC(-HD) (auxiliary code P-8 and later) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

  • Page 38: E1. Fh-Aac(-Hd) (Auxiliary Code P-5 And Earlier)

    E1. FH2-AAC(-HD) (auxiliary code P-5 and earlier) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

  • Page 39: E. Fh-Aac(-Hd) (Auxiliary Code P-6 And Later)

    E2. FH2-AAC(-HD) (auxiliary code P-6 and later) CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.
  • Page 40 F. RH1-AAC-W CAUTION Before diagnosing and/or servicing the unit, confirm that you have the proper wiring diagram by checking against the diagram located on the evaporator case cover.

This manual is also suitable for:

Safetemp fh1-aac-hdSafetemp fh2-aacSafetemp fh2-aac-hdSafetemp rh1-aacSafetemp rh1-aac-hdSafetemp rh2-aac-hd ... Show all

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