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B2. Thermistor/Control Module Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualified service

personnel to reduce the risk of death, electric shock, serious injury, or fire.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• Appliance is heavy. Use care when lifting or positioning. Work in pairs when

needed to prevent injury or damage.

• Make sure all food zones are clean after the appliance is serviced.

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.

See the table for default cabinet temperature control settings.

Model

Default Cabinet Temperature
Control Setting

Approximate Default Temperature

Undercounter
Worktop

Between 4 and 5

Refrigerator: 34°F (1°C)
Freezer: -5°F (-21°C)

Prep Table

6

34°F (1°C)

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
Confirm that the appliance location meets factory requirements:

• This appliance is not intended for outdoor use. Normal operating ambient

temperature should be within 45°F to 86°F (7°C to 30°C).

• The appliance should not be located next to ovens, grills, or other high heat

producing equipment. Check CM using the steps in "II.C. Control Module Check."

Note: • When checking voltage (115VAC), always choose a white (W) neutral wire to

establish a good neutral connection.

• CM has high and low voltage protection. If off on either protection, no LED is

visible and all components are off.
High Voltage: 135VAC
Low Voltage: 90VAC

• Solid red LED for 5 sec. at startup.
• Flashing green LED: Normal operation.
• Flashing red LED: check cabinet thermistor and defrost thermistor (if applicable).
• CM has a 2 min. minimum on time and 2 min. minimum off time for Comp.

1. Service Diagnosis: All Refrigerators, Prep Tables, and Freezers

1) Unplug the appliance from the electrical outlet.
2) Remove the rear panel.

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Содержание CRMF27

Страница 1: ...Models Undercounter Worktop Prep Table Commercial Series Refrigerated Kitchen Equipment Service Manual Number 73191 Issued 9 29 2011 Revised 5 1 2017 hoshizakiamerica com...

Страница 2: ...mproper installation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance Should the reader have any questions...

Страница 3: ...ter and Work Top Freezer 11 A2 Thermistor Control Module Sequence of Operation Flow Chart 12 1 Undercounter and Work Top Refrigerator 12 2 Prep Table 13 3 Undercounter and Work Top Freezer 14 B1 Therm...

Страница 4: ...ter and Worktop Refrigerator Cabinet Thermistor Control Module 52 2a Prep Table Cabinet Thermostat Without Defrost Heater 53 2b Prep Table Cabinet Thermostat With Defrost Heater 54 2c Prep Table Cabin...

Страница 5: ...plicable national state and local codes and regulations To reduce the risk of electric shock do not touch the plug with damp hands Unplug the appliance before servicing This appliance requires an inde...

Страница 6: ...prep table models Be careful when opening and closing the doors or rail cover when children are in the area Open and close the doors and rail cover prep table models with care Opening the doors or ra...

Страница 7: ...to be adjusted to prevent items from freezing Alternatively seal ingredients and store them in a refrigerator or freezer NOTICE Protect the floor when moving the appliance to prevent damage to the fl...

Страница 8: ...Shroud Cabinet Temperature Control Dial Cabinet Thermostat Thermistor Verify Auxiliary Code in Parts List for Change Pans Rail Dividers Upper Front Upper Rear Lower Rear Lower Front Rail Cover Air Di...

Страница 9: ...ator Compressor Drier Condenser Fan Condenser Freezer and Prep Table Models Defrost Heater Defrost Safety Thermostat and Defrost Thermistor Cabinet Thermostat Bulb Capillary Tube High Pressure Switch...

Страница 10: ...stat Control Sequence of Operation Flow Chart 1 Undercounter and Work Top Refrigerator Refrigerator Sequence Flow Chart 1 Startup Cool Down 2 Cool Down Achieved CTh closed Comp energized ConFM energiz...

Страница 11: ...ost heater DTh defrost thermistor EvapFM evaporator fan motor MH mullion heater PH perimeter heater Freezer Sequence Flow Chart 1 Startup Cool Down 2 Cool Down Achieved CTh closed Comp energized ConFM...

Страница 12: ...Refrigerator Sequence Flow Chart 2 min Comp on timer starts 2 min Comp off timer starts Legend Comp compressor ConFM condenser fan motor CTh cabinet thermistor EvapFM evaporator fan motor Power on Red...

Страница 13: ...denser fan motor CTh cabinet thermistor DH defrost heater DTh defrost thermistor EvapFM evaporator fan motor Note Delays a 2 min minimum Comp on timer starts when Comp energizes b 2 min minimum Comp o...

Страница 14: ...p below 41 F 5 C 5 min min DT starts 60 min max DT starts DH energized Comp de energized ConFM de energized EvapFM de energized MH de energized PH de energized Defrost Initiation Time Temp achieved No...

Страница 15: ...he electrical outlet 2 Remove the rear panel 3 Plug the appliance back into the electrical outlet 4 Startup Cool Down Temperature above setpoint CTh closed Comp ConFM and EvapFM energize Diagnosis Con...

Страница 16: ...ient Comp HPS Activation CRMR60 and CRMR72 Prep Table Check continuity of HPS If open allow time for system pressure to equalize and HPS to reset If HPS does not reset replace HPS and diagnose reason...

Страница 17: ...FM and EvapFM For CRMF48 01 W W01 and CRMF60 W also see HPS Activation CRMF48 01 W W01 and CRMF60 W below Check voltage at Comp external protector and Comp terminals Check Comp windings Check voltage...

Страница 18: ...m DST is closed If not let DH cool then recheck DST If DST is still open replace DST Check DH amp draw and DH continuity Defrost Termination Advance DT cam to terminate DT If CTh closed confirm Comp C...

Страница 19: ...34 F 1 C The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation and proper voltage per nameplate...

Страница 20: ...at CM C 1 brown BR wire to neutral W wire If 115VAC is not present replace CM If 115VAC is present check HPS continuity if applicable See f HPS Activation below Comp If 115VAC is present check Comp ex...

Страница 21: ...te When DTh is above 50 F on Prep Tables or above 41 F on Freezers defrost will not initiate and 6 hr DT resets and starts once DTh temperature cools below 50 F on Prep Tables and cools below 41 F on...

Страница 22: ...de energize DH energizes EvapFM continues b Freezer Check that Comp ConFM PH MH and EvapFM de energize DH energizes 1 TD If Comp and ConFM continue wait 1 to 2 min and make several more attempts of m...

Страница 23: ...ConFM and EvapFM de energized check for 115VAC between DT 2 R and neutral W If 115VAC is not present between DT 4 BK or BR and neutral W or between DT 2 R and neutral W DT switch internal defective R...

Страница 24: ...reezers check for 115VAC at CM 1 C BR to neutral W If 115VAC is not present replace CM If 115VAC is present and Comp energized and ConFM did not check ConFM blades for binding and motor winding contin...

Страница 25: ...er DTh warms to 45 F 7 C or 50 F 10 C DH de energizes Confirm continuity of DTh Replace as needed If DTh is good and DH continues after DTh achieves 45 F 7 C or 50 F 10 C replace CM Legend Comp compre...

Страница 26: ...e nameplate This appliance is not intended for outdoor use Normal operating ambient temperature Undercounter and Worktop 45 F to 100 F 7 C to 38 C Prep Table 45 F to 86 F 7 C to 30 C The appliance sho...

Страница 27: ...ontacts 11 Thermostatic Expansion Valve not adjustable CRMF48 01 W W01 auxiliary codes A 5 and B 5 a Defective 2 Evaporator is Frozen Up Evaporator is Frozen Up Possible Cause 1 Evaporator a Dirty 2 E...

Страница 28: ...efrost timer terminates 1 Undercounter and Worktop Refrigerators Off cycle defrost between run cycles III Controls and Adjustments A Temperature Settings 1 Temperature Reading A thermometer with both...

Страница 29: ...ow the steps below 1 Make sure the appliance is unplugged then remove the rear panel See Fig 2 2 Rotate the defrost timer cam clockwise until it clicks When the appliance is plugged in it will start a...

Страница 30: ...he high side of the appliance exceeds Hoshizaki specifications the high pressure switch activates and interrupts the compressor circuit de energizing the compressor until the pressure returns to an ac...

Страница 31: ...store it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 minutes when replacing or servicing parts The Polyol Ester POE oi...

Страница 32: ...ow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an...

Страница 33: ...em to charge with liquid until the proper charge weight is met 8 Close the high side valve on the gauge manifold then close the refrigerant access valve if applicable Disconnect the gauge manifold hos...

Страница 34: ...ly open position and remove the upper hinge bracket inner screw See Fig 5 3 Slide the upper hinge bracket out from under the outer screw and remove the door WARNING Keep away from upper hinge bracket...

Страница 35: ...cap and filler screws on the opposite side of the door Upper Hinge Bracket Door Screw Washer Filler Cap Door Spring Cartridge Filler Screws Thrust Washers Screws Filler Screws Filler Cap Door Spring C...

Страница 36: ...cap is not reusable 13 Remove the upper hinge bracket screws from the new location and apply Loctite Threadlocker Blue 242 or 243 to the threads Next start the upper hinge bracket outer screw into the...

Страница 37: ...n D Door Drawer Location Reversal The appliance is provided with a cabinet design which after being delivered to the installation location permits changing of the drawer and door locations To change t...

Страница 38: ...e rear and front of the drawer while removing it WARNING Be sure to close the safety clips when reinstalling the drawer 3 Remove the 4 horizontal mullion screws then cut the horizontal mullion silicon...

Страница 39: ...Right Front Hex Bolts Left Drawer Frame Right Drawer Frame Right Drawer Frame Left Rear Hex Bolts Left Front Hex Bolts Left Drawer Frame Left Rear Bracket Left Front Bracket Right Rear Bracket Right F...

Страница 40: ...ation and secure it Place the filler screw in the former center rear drawer frame bracket hole Fig 20 Center Rear Drawer Frame Bracket Center Rear Drawer Frame Bracket New Center Rear Drawer Frame Bra...

Страница 41: ...he door to the fully open position and remove the upper hinge bracket inner screw See Fig 24 10 Slide the upper hinge bracket out from under the outer screw and remove the door WARNING Keep away from...

Страница 42: ...2 or 243 to the threads Next start the upper hinge bracket outer screw into the appliance Rotate a few threads into the appliance do not tighten the screw See Fig 26 Fig 26 Upper Hinge Bracket Outer S...

Страница 43: ...Relocation 20 Place the left rear bracket in place on the center rear drawer frame bracket with hex bolts removed in step 4 Leave loose do not tighten at this time See Fig 36 21 Place the left front b...

Страница 44: ...Bracket Lip Left Front Bracket Lip Right Drawer Frame Relocation 23 Place the right rear bracket in place on the right side panel with the hex bolts removed in step 4 Leave loose do not tighten at thi...

Страница 45: ...right rear bracket and tighten then align under the right front bracket and tighten See Fig 32 Note Be sure the right drawer frame is under both the right rear bracket lip and right front bracket lip...

Страница 46: ...and secure with screws removed in step 3 27 Place a bead of food grade silicone down the 2 outside vertical gaps between the mullion and appliance See Fig 33 Fig 33 Horizontal Mullion Silicone Locati...

Страница 47: ...9 Make sure all gaskets are making good contact Using a flashlight check that there are no openings around all gaskets 30 Unlock the casters and move the appliance back into its original position Lock...

Страница 48: ...ING Prevent the doors from closing to reduce the risk of children getting trapped NOTICE Clean the cabinet interior door gaskets and shelves 1 Before shutting down the appliance move the stored food i...

Страница 49: ...e risk of children getting trapped Leave the shelves in place so that children may not easily climb inside This appliance contains refrigerant and must be disposed of in accordance with applicable nat...

Страница 50: ...G05 and Later 4 7 360 140 7 CRMR60 Undercounter and Worktop 115 60 1 4 2 290 120 8 CRMR60 Prep Table and Mega Top F 7 and Earlier 115 60 1 6 360 140 10 3 CRMR60 Prep Table and Mega Top F 8 and Later...

Страница 51: ...51 B Wiring Diagrams 1a Undercounter and Worktop Refrigerator Cabinet Thermostat CRMR27 and CRMR48 Auxiliary Code C 6 and Later CRMR27 DBU for auxiliary code A 5 K and earlier...

Страница 52: ...52 1b Undercounter and Worktop Refrigerator Cabinet Thermistor Control Module...

Страница 53: ...53 2a Prep Table Cabinet Thermostat Without Defrost Heater High Pressure Switch Cut Out 300 10 PSIG Cut In 190 20 PSIG...

Страница 54: ...54 2b Prep Table Cabinet Thermostat With Defrost Heater High Pressure Switch Cut Out 300 10 PSIG Cut In 190 20 PSIG Defrost Thermostat Cut Out 120 F 5 F 49 C 3 C Cut In 70 F 5 F 21 C 3 C...

Страница 55: ...55 2c Prep Table Cabinet Thermistor Control Module Defrost Thermostat Cut Out 120 F 5 F 49 C 3 C Cut In 70 F 5 F 21 C 3 C High Pressure Switch Cut Out 300 10 PSIG Cut In 190 20 PSIG...

Страница 56: ...ter and Work Top Freezer Cabinet Thermostat Defrost Thermostat Cut Out 120 F 5 F 49 C 3 C Cut In 70 F 5 F 21 C 3 C DBU for auxiliary code A 5 K and earlier High Pressure Switch Cut Out 300 10 PSIG Cut...

Страница 57: ...3b Undercounter and Work Top Freezer Cabinet Thermistor Control Module High Pressure Switch Cut Out 300 10 PSIG Cut In 190 20 PSIG Defrost Thermostat Cut Out 120 F 5 F 49 C 3 C Cut In 70 F 5 F 21 C 3...

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