Hoshizaki FTC-120MDA Service Manual Download Page 45

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IV. REMOVAL AND REPLACEMENT OF COMPONENTS

WARNING

Always unplug the unit or turn off the main power supply before replacing

components.

1. REFRIGERATION CIRCUIT

[a] REFRIGERANT

Refrigerant R134a used for this unit is not flammable or poisonous itself. It also provides

remarkably lower pressure than ammonia or similar substances at the same condensing

temperatures.

[b] COMPRESSOR

1) Remove the hexagon head bolt at the bottom of the front panel, and take off the front

panel.

2) Recover the refrigerant from the access valve, and store it in a proper container, if

required by an applicable law.

3) Remove the screws securing the condenser to the refrigeration unit base and the

shroud (condenser cover) to the cabinet, and pull out the condenser about 200 mm to

the front.

Front Panel

Control Box

Earth Wire

Hex Head Bolt

Unit Side Panel

Window Panel

Summary of Contents for FTC-120MDA

Page 1: ...NO T069 838 ISSUED MAY 31 2011 REVISED JUN 16 2014 HOSHIZAKI UNDERCOUNTER REFRIGERATOR FREEZER SERVICE MANUAL MODEL RTC M_A series FTC M_A series ...

Page 2: ...c FTC 150MDA FTC 180MNA FTC 180MDA 17 2 REFRIGERATION CIRCUIT 18 a RTC SERIES 18 b FTC SERIES 19 3 ELECTRONIC CONTROLS 20 a SET POINT TEMPERATURE 20 b CABINET TEMPERATURE DIFFERENTIAL 20 c DEFROST CYCLE 20 d DEFROST TERMINATION TEMPERATURE 20 e TEMPERATURE DISPLAY 20 f COMPRESSOR SOFT START 21 g HIGH PRESSURE SWITCH 21 h CHECKING SET POINT TEMPERATURE 22 i MANUAL DEFROST 22 j ERROR CODES 22 4 TIMI...

Page 3: ... CIRCUIT 42 a REFRIGERANT 42 b COMPRESSOR 42 c CONDENSER 44 d DRIER 44 e EVAPORATOR 44 2 ELECTRICAL PARTS 45 a CONDENSER FAN MOTOR 45 b INTERIOR FAN MOTOR 46 c DEFROST HEATER THERMAL FUSE 47 d INTERIOR THERMISTOR DEFROST THERMISTOR 48 e CONTROLLER 49 f FUSE 49 g FORCED DRAIN WATER EVAPORATION PAN 49 3 DOOR GASKET 50 a REMOVAL 50 b REPLACEMENT 50 ...

Page 4: ...eaning be sure to unplug the unit or disconnect the main power supply before servicing the unit to prevent electric shocks 3 If the unit must be energized for inspection of the electric circuit use rubber gloves to avoid contact with any live parts resulting in electric shocks 4 Keep the following in mind when servicing the refrigeration circuit 1 Be sure to recover the refrigerant Do not discharg...

Page 5: ...hocks 4 Be sure to replace damaged or deteriorated power cords and lead wires to prevent fire heat or electric shocks 5 Cut off lead wires must be bound using closed end connectors or the like with their closed ends up to avoid entrance of moisture that could lead to electric leaks or fire 6 After servicing always use a megohmmeter 500V DC to check for the insulation resistance of at least 1 megoh...

Page 6: ...3 2 DIMENSIONS SPECIFICATIONS a RTC 120MNA ...

Page 7: ...4 b RTC 120MDA ...

Page 8: ...5 c RTC 150MNA ...

Page 9: ...6 d RTC 150MDA ...

Page 10: ...7 e RTC 180MNA ...

Page 11: ...8 f RTC 180MDA ...

Page 12: ...9 g FTC 120MNA ...

Page 13: ...10 h FTC 120MDA ...

Page 14: ...11 i FTC 150MNA ...

Page 15: ...12 j FTC 150MDA ...

Page 16: ...13 k FTC 180MNA ...

Page 17: ...14 l FTC 180MDA ...

Page 18: ...15 II TECHNICAL INFORMATION 1 WIRING DIAGRAM a RTC SERIES ...

Page 19: ...16 b FTC 120MNA FTC 120MDA FTC 150MNA ...

Page 20: ...17 c FTC 150MDA FTC 180MNA FTC 180MDA ...

Page 21: ...18 2 REFRIGERATION CIRCUIT a RTC SERIES Refrigerant HFC 134a Interior Fan Motor Evaporator Heat Exchange Compressor Drier Capillary Tube Condenser Condenser Fan Motor ...

Page 22: ...19 b FTC SERIES Refrigerant HFC 404A Interior Fan Motor Evaporator Heat Exchange Compressor Drier Capillary Tube Condenser Condenser Fan Motor Pressure Switch ...

Page 23: ...Accordingly the average cabinet temperature will be around the set point temperature 2 C c DEFROST CYCLE The unit automatically defrosts the evaporator 3 hours RTC series or 6 hours FTC series after the refrigeration starts The defrost indicator light on the operation panel comes on when the defrost cycle starts d DEFROST TERMINATION TEMPERATURE Off cycle defrost RTC series 5 C Heater defrost FTC ...

Page 24: ...al Control Power ON 3 min Compressor Condenser Fan Motor Cabinet Temp Display Interior Fan Motor RTC ON OFF ON OFF 1 min Interior Fan Motor FTC ON OFF 3 min 3 min Compressor Condenser Fan Motor Interior Thermistor Set Point 4K ON OFF Set Point When the compressor turns off during normal control it has a mandatory 3 minute delay before startup For example if the compressor turns off by its thermist...

Page 25: ... E1 Cabinet sensor interior thermistor error Compressor shuts down Press any key to stop beep When troubleshooting is over system recalculates compressor delay time See III 1 ERROR CODES for further details E2 Evaporator defrost thermistor error Defrost termination temperature is invalid Press any key to stop beep See III 1 ERROR CODES for further details FTC series Code Possible Cause Operation a...

Page 26: ... Compressor Condenser Fan Motor RTC series Interior Fan Motor Interior Thermistor Temp Set Point Temp 4 K Set Point Temp FTC series 1 min Interior Fan Motor Interior Thermistor Temp Set Point Temp 4 K Set Point Temp 1 Standby at Startup Only temperature indication is available for 3 min not a sign of failure ...

Page 27: ...splay Temp FTC series Heater defrost Frame Heater Compressor Condenser Fan Motor Interior Fan Motor Defrost Heater Detects end of cycle 20 C Defrost Interior Thermistor Temp Defrost Drain Until Thermistor detects 5 min 5 min 8 min Temp Display Temp dF Temp Forced drain water evaporation model only Power Supply Evaporation Pan Heater 60 C OFF Evaporation Pan Thermostat 45 C ON Interior FM Display d...

Page 28: ...k function 55 NC F02 Temperature value setting 2 to 12 1 C F03 Temperature return difference setting 1 to 15 4 C F04 Delay time of compressor startup 1 to 15 3 min F05 Cabinet temperature calibration 5 to 5 1 C F06 Maximum defrost time 1 to 60 60 min F07 Defrost cycle 1 to 30 6 30 min F08 Defrost termination temperature 20 to 30 5 C F09 Whether activate evaporator sensor or not 00 inactivate 01 ac...

Page 29: ...sor 2 After entering the menu setting status press the up or down key to choose the desired menu item from F01 to F09 3 After choosing the desired menu item press the set key to set parameter value Press the up or down key to adjust parameter value and then repress the set key to go back to the menu setting status 4 Under the setting status press the defrost reset key or perform no operation for 3...

Page 30: ...mperature is invalid Wiring Diagram 6 alarm code E1 with the buzzer doing nothing close the compressor when the troubleshooting is over system will recalculate the compressor delay time When the door trip alarms the controller will flashing indicate the alarm code E2 with the buzzer ringing after running the time of F5 Alarm code Reason Output mode E1 Cabinet sensor error Close the compressor when...

Page 31: ...sec Enter administrator setting Down Check menu item Calibrate parameter Down 3 sec Fast forward menu item Quickly calibrate parameter Up Upload copy key Check menu item Calibrate parameter Up 3 sec See Note Start stop forced refrigeration Fast rewind menu item Quickly calibrate parameter Defrost 3 sec Start stop manual defrost Up Down 10 sec Lock key operation Note Do not use Up 3 sec in normal m...

Page 32: ...al display of room temp It 1 Defrost start temp SEt 2 Display set point dEF 3 Display dF dEF Display delay after defrosting dAd 0 to 255 min 18 Display delay time after defrosting Fdt 0 to 255 min 5 Draining time after defrost dPo y 0 Immediately n 1 Later n Defrost cycle at initial startup dAF 0 to 24 hrs 0 Defrost delay after forced refrigeration FnC C N Start stop with compressor OFF when defro...

Page 33: ...Compressor delay time exceeds the set delay time b Under non defrost mode the room temperature is higher than the set point temperature return difference c Forced refrigeration starts when the room temperature is higher than the set point temperature d In defrost cycle Stop condition Compressor relay opens when any of the following conditions is met a Room temperature is lower than the set point t...

Page 34: ...larm temperature limit and the set alarm delay time runs out LED displays HHH when the room temperature exceeds the upper limit of measured temperature or the thermistor short circuits and runs out of the thermistor error delay time LED displays LLL when the room temperature is lower than the lower limit of measured temperature or the thermistor short circuits and runs out of the thermistor error ...

Page 35: ...ls Warning Prohibit using the machine under the environment of over damp high temp strong electromagnetism interference or strong corrosion Notices 1 The power supply should conform to the voltage value indicated in the instruction and make sure the power supply steady 2 To avoid the possible interference the sensor down lead and power wire should be kept a distance Size 1 Product size 75 34 5 85m...

Page 36: ...eset HHH Interior thermistor defective Repeats starting and stopping operation at certain interval Interior thermistor circuit shorted dusty connector Automatically resets after cause is removed LLL Repeats starting and stopping operation at certain interval Interior thermistor circuit open connector unplugged Automatically resets after cause is removed HHH With 6 down key pressed Defrost thermist...

Page 37: ... load too large Door gap 4 Interior Thermistor Location 9 Interior Fan Motor Open circuit defective 2 Controller Defective 13 Refrigeration Circuit Capillary drier 14 Refrigerant Leak 8 Condenser Fan Motor Locked open circuit 7 Compressor Defective Poor refrigeration Slow refrigeration Set point is reached Interior overloaded Set point is not reached See Compressor runs with no refrigeration above...

Page 38: ...energized Open circuit Frame heater is energized Duty ratio too high Forced drain water evaporation models only Water leak from Drain water is not evaporated Evaporation pan heater 17 Evaporation Pan Heater Open circuit bottom is not energized 16 Thermostat Open circuit defective 11 Thermal Fuse Blown out ...

Page 39: ...cancellation 0 5 second No button defrost cycle starts automatically operation See II 5 b No error indication Ambient temp too high Condensing capacity insufficient Heat source ventilation 15 Air Filter Clogged Internal load too large Door gap 4 Interior Thermistor Location 9 Interior Fan Motor Open circuit defective 2 Controller Defective 13 Refrigeration Circuit Capillary drier 14 Refrigerant Le...

Page 40: ...too low LLL HHH error indication 4 Interior Thermistor Open circuit defective Normal condition See III 1 Abnormal noise 7 Compressor 8 Condenser Fan Motor 9 Interior Fan Motor Condensation Frame heater is not energized Open circuit Frame heater is energized Duty ratio too high Forced drain water evaporation models only Water leak from Drain water is not evaporated Evaporation pan heater is not 17 ...

Page 41: ... Disconnected replaced with interior thermistor etc Abnormal resistance Immerse in ice water to check resistance 25 30k Replace if necessary RTC series Short circuit temp displayed as E2 Clean dry connector Replace Open circuit temp displayed as E2 Replace FTC series Short circuit temp displayed as HHH Clean dry connector Replace Open circuit temp displayed as LLL Replace 6 Pressure Switch Open ci...

Page 42: ...uum Replace drier at same time 14 Refrigerant Leak Discharge pressure Low Locate leakage and replace Suction pressure Low Replace drier at same time Compressor discharge pipe will not heat up Compressor suction pipe will not cool down Note Low side leak requires drying after Check with leak detector welding 15 Air Filter Clogged Clean Air Cooled Condenser Dirty fins 16 Drain Hose Without trap stru...

Page 43: ...arth before servicing Electrostatic discharge will cause severe damage to the controller The controller and thermistor can be replaced separately Do not drop the controller on the floor The thermistor and pressure switch leads have a thin coating and are potentially breakable Do not tension the leads The connectors must not be subjected to tension to prevent disconnection or breakage After servici...

Page 44: ... container 3 Use the Ω range of the tester to measure the resistance between the thermistors 4 If the measured resistance is not within 25 30 kΩ standard 27 kΩ replace the thermistor see the T R curve below T R Curve Interior Defrost Thermistor The graph shows reference values only and may differ from actual values 0 10 20 30 40 50 60 70 80 90 100 110 120 40 30 20 10 0 10 20 30 40 50 60 70 80 Temp...

Page 45: ...ubstances at the same condensing temperatures b COMPRESSOR 1 Remove the hexagon head bolt at the bottom of the front panel and take off the front panel 2 Recover the refrigerant from the access valve and store it in a proper container if required by an applicable law 3 Remove the screws securing the condenser to the refrigeration unit base and the shroud condenser cover to the cabinet and pull out...

Page 46: ... Remove the bolts securing the compressor 10 To replace the removed parts reverse the above removal procedure Note 1 To recharge the refrigerant install a stop valve in the access line 2 Evacuation time must be at least 1 hour 3 To prevent oxidation braze the pipes with nitrogen gas flowing 4 Check for gas leaks remove flux and oxide film and apply anti corrosion treatment 5 While brazing use a we...

Page 47: ...quipment Use a wet towel to protect any flammable materials from burner flame 4 To replace the removed parts reverse the above removal procedure Note 1 See Notes 1 5 for b COMPRESSOR 2 After brazing wait for the drier to cool down before securing it to the shroud e EVAPORATOR 1 Remove the front panel 2 Unscrew the top and bottom of the control box to remove the control box 3 Remove the unit side p...

Page 48: ...r from the heat exchanger use a wet towel to protect the wires from burner flame 2 ELECTRICAL PARTS a CONDENSER FAN MOTOR 1 Pull out the condenser and condenser fan motor assembly according to steps 1 through 4 of b COMPRESSOR 2 Disconnect the condenser fan motor leads 3 Remove the screws securing the condenser fan motor to the bracket and take off the condenser fan motor 4 To replace the removed ...

Page 49: ...ole from inside and outside the cabinet 5 Remove the interior fan motor assembly 6 Remove the screws securing the interior fan motor to the bracket and take off the interior fan motor 7 To replace the removed parts reverse the above removal procedure Heat Exchanger Compressor Shroud Condenser Cover Condenser Condenser Fan Motor Exhaust Duct Interior Fan Motor Intake Duct Evaporator Evaporator Cove...

Page 50: ...ter and thermal fuse with the heater cover and bracket from the evaporator 6 Bend the heater holder on the heater cover to remove the defrost heater from the heater cover Take off the clip to remove the thermal fuse 7 Pull the leads out of the wire through hole to remove the defrost heater or thermal fuse 8 To replace the removed parts reverse the above removal procedure Evaporator Exhaust Duct Th...

Page 51: ...or Pull the thermistor clip off the evaporator to remove the defrost thermistor 6 To replace the removed parts reverse the above removal procedure Evaporator Plastic Clamp Interior Thermistor Thermistor Clip Defrost Thermistor Note 1 After servicing insert new insulations into the wire through hole from inside and outside the cabinet Do not reuse the removed insulations 2 Be careful not to contact...

Page 52: ...er and turn it counterclockwise 3 Remove the fuse from the fuse holder 4 To replace the removed parts reverse the above procedure g FORCED DRAIN WATER EVAPORATION PAN Forced drain water evaporation model only 1 Remove the front panel 2 Remove the side panel of the refrigeration unit 3 Disconnect the connector at the end of the evaporation pan lead wire 4 Put the evaporation pan lead wire and conne...

Page 53: ...g the door gasket check every part for tightness and security Sprayer Door Gasket Door Liner Door Liner Channel Door Replacement of the door or door gasket may cause a gap between the cabinet and the gasket To correct this gap slightly heat the gasket with a drier To avoid melting the gasket 1 Keep the drier at least 100 mm away from the gasket 2 Move the drier up and down to heat the entire gap N...

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