Related Manuals for Hoshizaki RTC-A series
Summary of Contents for Hoshizaki RTC-A series
- Page 1 NO. T012-784 ISSUED: JUN. 26, 2009 REVISED: HOSHIZAKI UNDERCOUNTER REFRIGERATOR/FREEZER RTC-A series MODEL FTC-A series SERVICE MANUAL...
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Page 2: Table Of Contents
CONTENTS PAGE I. GENERAL INFORMATION --------------------------------------------------------------------------1 1. SAFETY INSTRUCTIONS - ------------------------------------------------------------------------1 2. DIMENSIONS/SPECIFICATIONS ---------------------------------------------------------------3 [a] RTC-120SNA -------------------------------------------------------------------------------------3 [b] RTC-120SDA -------------------------------------------------------------------------------------4 [c] RTC-150SNA -------------------------------------------------------------------------------------5 [d] RTC-150SDA -------------------------------------------------------------------------------------6 [e] RTC-180SNA -------------------------------------------------------------------------------------7 [f] RTC-180SDA -------------------------------------------------------------------------------------8 II. TECHNICAL INFORMATION - ----------------------------------------------------------------------9 1. WIRING DIAGRAM - ---------------------------------------------------------------------------------9 2. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 10 3. ELECTRONIC CONTROLS --------------------------------------------------------------------- 11 [a] SET POINT TEMPERATURE -------------------------------------------------------------- 11 [b] CABINET TEMPERATURE DIFFERENTIAL ------------------------------------------- 11 [c] DEFROST CYCLE ---------------------------------------------------------------------------- 11 [d] DEFROST COMPLETION TEMPERATURE ------------------------------------------- 11 [e] CLOGGED CONDENSER DETECTION TEMPERATURE ------------------------- 11 [f] TEMPERATURE DISPLAY CYCLE ------------------------------------------------------- 11 [g] COMPRESSOR SOFT START - ------------------------------------------------------------ 12 [h] CABINET TEMPERATURE AND TEMPERATURE DISPLAY - --------------------- 12 [] RESOLUTION ---------------------------------------------------------------------------------- 13 [j] SET POINT TEMPERATURE AND CABINET TEMPERATURE------------------- 13 [k] CHECKING AND ADJUSTING SET POINT TEMPERATURE --------------------- 13... - Page 3 III. SERVICE DIAGNOSIS - --------------------------------------------------------------------------- 25 1. FLOWCHART --------------------------------------------------------------------------------------- 25 2. SERVICE DIAGNOSIS --------------------------------------------------------------------------- 26 3. CONTROLLER BOARD - ------------------------------------------------------------------------- 28 [a] SERVICING CONTROLLER BOARD ---------------------------------------------------- 28 [b] CHECKING THERMISTOR ----------------------------------------------------------------- 29 IV. REMOVAL AND REPLACEMENT OF COMPONENTS ---------------------------------- 31 1. REFRIGERATION UNIT-------------------------------------------------------------------------- 31 2. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 31 [a] REFRIGERANT -------------------------------------------------------------------------------- 31 [b] COMPRESSOR - ------------------------------------------------------------------------------- 32 [c] EVAPORATOR AND DEFROST HEATER ---------------------------------------------- 32 [d] CONDENSER ---------------------------------------------------------------------------------- 33 3. CONTROL BOX ------------------------------------------------------------------------------------ 34 4. FAN MOTORS -------------------------------------------------------------------------------------- 34 [a] CONDENSER FAN MOTOR - --------------------------------------------------------------- 34 [b] INTERIOR FAN MOTOR -------------------------------------------------------------------- 35 5. THERMISTORS ------------------------------------------------------------------------------------ 35 [a] INTERIOR THERMISTOR ------------------------------------------------------------------ 35...
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Page 4: 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 5 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.
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Page 6: Dimensions/Specifications
2. DIMENSIONS/SPECIFICATIONS [a] RTC-120SNA... -
Page 7: [B] Rtc-120Sda
[b] RTC-120SDA... -
Page 8: [C] Rtc-150Sna
[c] RTC-150SNA... -
Page 9: [D] Rtc-150Sda
[d] RTC-150SDA... -
Page 10: [E] Rtc-180Sna
[e] RTC-180SNA... -
Page 11: [F] Rtc-180Sda
[f] RTC-180SDA... -
Page 12: Technical Information
II. TECHNICAL INFORMATION 1. WIRING DIAGRAM... -
Page 13: Refrigeration Circuit
2. REFRIGERATION CIRCUIT Refrigerant: HFC-134a (RTC series) HFC-404A (FTC series) -
Page 14: Electronic Controls
3. ELECTRONIC CONTROLS [a] SET POINT TEMPERATURE (mean temperature Set Point Temperature between compressor ON and OFF temperatures) RTC series: -6 to +12°C FTC series: -25 to -7°C Time Compressor [b] CABINET TEMPERATURE DIFFERENTIAL 3.5 K OFF temperature = Set point temp - 2.0 K ON temperature = Set point temp + 1.5 K Note: On the Controller Board only. -
Page 15: [G] Compressor Soft Start
[g] COMPRESSOR SOFT START 1) Startup Power ON 3.5 min Compressor Condenser Fan Motor Interior Fan Motor Cabinet Temp Display When the power supply is turned on, the Interior Fan Motor starts up and the Temperature Display Window shows the cabinet temperature, but the Compressor and Condenser Fan Motor start up with a 3.5 minute delay. -
Page 16: [] Resolution
[i] RESOLUTION 0.5 K ( K for temperature setting and display) [j] SET POINT TEMPERATURE AND CABINET TEMPERATURE (Compressor OFF temperature / Compressor ON temperature) Set Point Temp (°C) Cabinet Temp (°C) 10/13 9/12 8/11 7/10 Set Point Temp (°C) Cabinet Temp (°C) -1/2 Refrigerator... -
Page 17: [L] Manual Defrost
[l] MANUAL DEFROST When the two Temperature Control Buttons are pressed at the same time for 3 seconds, the refrigerator/freezer will start a manual defrost cycle. The refrigerator/freezer will start repeating automatic defrost cycles 6 hours after the Temperature Control Buttons are pressed. -
Page 18: [B] Eeprom Verify Error (Ed)
[b] EEPROM VERIFY ERROR (ED) When every value retrieved from EEPROM (IC3) for verification differs from the memory setting of the Controller Board, “ED” will be displayed. The “ED” display will automatically reset when retrieved values have been verified. The EEPROM (IC3) may be defective. Replace the Controller Board. [c] CABINET TEMPERATURE TOO HIGH (E1) When the cabinet temperature rises to the alert temperature (0 K above the set point), the High Temperature Alert Timer will start counting down from 120 minutes. -
Page 19: [D] Cabinet Temperature Too Low (E2)
[d] CABINET TEMPERATURE TOO LOW (E2) When the cabinet temperature drops to the alert temperature (5 K below the set point), the Low Temperature Alert Timer will start counting down from 60 minutes. When the Timer counts down to zero, “E2” will be displayed. If the cabinet temperature rises above the alert temperature before the Timer counts down to zero, the Timer will reset and “E2”... -
Page 20: [F] Abnormal Pressure (E4)
“dF” display Defrost starts delay ends Drain Defrost Thermistor senses Compressor 60 min Defrost Heater “dF” “E3” / ”dF” “E3” / cabinet temp Cabinet temp Temp Display Flashing “E3” Window [f] ABNORMAL PRESSURE (E4) When the Clog Thermistor senses a temperature above 70°C (RTC series) or 60°C (FTC series), the refrigerator/freezer will detect an abnormal pressure to stop the Compressor for 5 minutes. -
Page 21: [G] Condenser Clogged (E7)
[g] CONDENSER CLOGGED (E7) When the Clog Thermistor senses a temperature above 58°C (RTC series) or 55°C (FTC series) for 2 minutes, “E7” will be displayed. The “E7” display will automatically reset when the Clog Thermistor senses a temperature below the above point. The cause may be: 1) The Condenser Fan Motor is locked or defective. -
Page 22: [] Clog Thermistor Defective (E9)
Less than 0 min Short circuit error resets 0 min Short Circuit Detection (50°C) Defrost Thermistor Open circuit error resets reading Open Circuit Detection (-55°C) Cabinet temp Cabinet temp Temp Display Flashing Flashing Window “E8” “E8” [i] CLOG THERMISTOR DEFECTIVE (E9) When the Clog Thermistor senses a temperature below -22°C (open circuit) or above 86 °C for 10 minutes (short circuit), “E9”... -
Page 23: [B] Energy Saving Mode
resume the energy saving control, press and hold the downward Temperature Control Button “▼” again for 5 seconds. The decimal point reappears on the Temperature Display Window. [b] ENERGY SAVING MODE The refrigerator/freezer is under energy saving control while the Temperature Display Window indicates a decimal point. -
Page 24: Timing Chart
6. TIMING CHART [a] STANDARD MODE (RTC series) “dF” display Display Drain delay delay 5 min 5 min min Defrost thermistor reads 15°C Soft timer 3.5 min Compressor (X) Anti-fan lock 0 sec Interior Fan Motor (X3) Defrost Heater (X2) temp Interior Thermistor... -
Page 25: [B] Energy Saving Mode (Rtc SerEs)
[b] ENERGY SAVING MODE (RTC series) “dF” display Display Drain delay delay 5 min 5 min min Defrost thermistor reads 15°C Soft timer 3.5 min Compressor (X) Anti-fan lock 5 sec 50 sec 0 sec Interior Fan Motor (X3) Defrost Heater (X2) temp... -
Page 26: [C] Standard Mode (Ftc SerEs)
[c] STANDARD MODE (FTC series) “dF” display Display Drain delay delay 5 min 5 min 8 min Defrost thermistor reads 5°C Soft timer 3.5 min Compressor (X) Anti-fan lock 0 sec Interior Fan Motor (X3) Defrost Heater (X2) temp Interior Thermistor temp 5°C... -
Page 27: [D] Energy Saving Mode (Ftc SerEs)
[d] ENERGY SAVING MODE (FTC series) “dF” display Display Drain delay delay 5 min 5 min 8 min Defrost thermistor reads 5°C Soft timer 3.5 min Compressor (X) Anti-fan lock 30 sec 30 sec 0 sec Interior Fan Motor (X3) Defrost Heater (X2) temp... -
Page 28: Service Diagnosis
III. SERVICE DIAGNOSIS 1. FLOWCHART... -
Page 29: Service Diagnosis
Cabinet temperature (E) too high Interior fan motor Relay (controller board) Cabinet temperature (E2) too low Interior thermistor Relay Controller board Abnormal noise Compressor Fan motor Relay 6, 7 2. SERVICE DIAGNOSIS Chart Item Possible Cause / Check Remedy Controller Board See "3. - Page 30 Chart Item Possible Cause / Check Remedy Relay Check continuity between terminals. Replace. Press armature if any. Normally open Normally closed Armature contact contact Release ∞ Ω 0 Ω Press 0 Ω ∞ Ω Power Relay G4F-11123T G2R-1A-T Defrost Cycle See "II.
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Page 31: Controller Board
Chart Item Possible Cause / Check Remedy 5 Start Capacitor Deformed or cover damaged. Replace. Run Capacitor Leaking impregnating agent. Loose connection. Tighten. Check resistance between terminals. Replace. Acceptable if pointer moves instantly when tester is applied and gradually moves back. Not acceptable if pointer reads 0 Ω. -
Page 32: [B] Checking Thermistor
* Do not short circuit the Relay output terminal coming from the Controller Board. * To protect the pattern from damage, place the Controller Board on a flat surface. * The Thermistor leads have a thin coating and are potentially breakable. Do not tension the leads. - Page 33 T-R Curve (Clog Thermistor) Temperature (°C) T-R Curve (Interior/Defrost Thermistor) R = 6 x Exp {3390 x ( 273.15+T 273.15 Note: This curve only shows reference values and can be slightly different from actual values. Temperature (°C)
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Page 34: Removal And Replacement Of Components
IV. REMOVAL AND REPLACEMENT OF COMPONENTS WARNING Always unplug the refrigerator/freezer before replacing components. 1. REFRIGERATION UNIT 1) Open and lift up the Front Panel to release it from the Hinges on the cabinet. 2) Disconnect the connectors under the Control Box. 3) Remove the hexagon head bolt (5x6) on the front of the Refrigeration Unit Base and the two hexagon nuts (stainless steel M6) on the Evaporator Box Panel. -
Page 35: [B] Compressor
[b] COMPRESSOR 1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1. REFRIGERATION UNIT”. 2) Use a screwdriver to remove the clamp from the Terminal Cover enclosing the Compressor’s electrical parts. 3) Take off the Terminal Cover, and remove the Start Capacitor and Starting Relay. 4) Recover the refrigerant from the Access Valve, and store it in a proper container, if required by an applicable law. -
Page 36: [D] Condenser
6) Disconnect the Glass Tube Heater and Interior Fan Motor leads, and remove the Clip and Thermal Fuse. 7) Remove the two truss head tapping screws (stainless steel 4x8) securing the Heater Cover. 8) Remove the six truss head tapping screws (stainless steel 4x8) securing the Evaporator, Evaporator Cover, and Evaporator Bracket. -
Page 37: Control Box
5) Remove the two truss head tapping screws (stainless steel 4x8) securing the Condenser. 6) Disconnect the Condenser from the refrigeration circuit using brazing equipment. 7) To replace the removed parts, reverse the above removal procedure. Note: See Notes 1 - 5 for “[b] COMPRESSOR”. 3. -
Page 38: [B] Interior Fan Motor
[b] INTERIOR FAN MOTOR 1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1. REFRIGERATION UNIT”. 2) Disconnect the Interior Fan Motor leads. 3) Remove the Interior Fan Motor from the Evaporator Cover by unscrewing the four pan head machine screws with washers (stainless steel 4x30). -
Page 39: Door Gasket
6. DOOR GASKET [a] REMOVAL ) Open the Door. 2) Detach the Door Gasket from the Door Pack. [b] REPLACEMENT 1) Spray water on the Door Pack Channel with a sprayer. 2) Fit the four corners of the Door Gasket into those of the Door Pack Channel. 3) Push in each part of the Door Gasket from both sides.
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