Service Manual Commercial Series Refrigerated Kitchen Equipment Models Upright S-Series hoshizakiamerica.
WARNING Only qualified service technicians should install and service the appliance. To obtain the name and phone number of your local Hoshizaki Certified Service Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage.
IMPORTANT This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary. CONTENTS Important Safety Information.................................................................................................. 5 I. General Information.........................
VIII. Technical Information..................................................................................................... 50 A. Electrical and Refrigerant Data.................................................................................... 50 B. Wiring Diagrams........................................................................................................... 51 1. CR1S-FS/FSL/HS/HSL Auxiliary Code E-5 and Earlier.......................................... 51 2.
Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, or damage to the appliance or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury. NOTICE Indicates a situation which could result in damage to the appliance or property. IMPORTANT Indicates important information about the use and care of the appliance.
WARNING, continued For 208-230VAC Models • THE APPLIANCE MUST BE GROUNDED: The appliance is equipped with a NEMA L14-20 four-prong locking, grounding plug to reduce the risk of potential shock hazards. It must be plugged into a properly grounded, independent 4-prong wall outlet. If the outlet is a 3-prong outlet or a 4-prong non‑locking outlet, it is your personal responsibility to have a qualified electrician replace it with a properly grounded, independent 4-prong locking wall outlet.
WARNING, continued • Do not place anything on top of the appliance. Foreign objects or moisture could enter the appliance and result in electric shock or fire. • The appliance is designed only for temporary storage of food. Employ sanitary methods. Use for any other purposes (for example, storage of chemicals or medical supplies such as vaccine and serum) could cause deterioration of stored items. • Do not block air inlets or outlets, otherwise cooling performance may be reduced.
I. General Information A. Construction 1.
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CTh in control 2-min. Comp on timer starts Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DTh-defrost thermistor EvapFM-evaporator fan motor EvapFM energized Comp de-energized ConFM de-energized 20-min. minimum defrost 2-hr defrost timer terminates 4. Defrost DTh in control a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models. b) 2-min. minimum Comp on timer starts when Comp energizes. c) 2-min.
Power on 12 Comp energized ConFM energized EvapFM energized 2-min. Comp on timer starts Comp de-energized ConFM de-energized EvapFM de-energized 20-min. minimum defrost 2-hr defrost timer terminates 4. Defrost Comp energized ConFM energized EvapFM energized DTh in control DTh warms to 44°F (6.6°C) or 1-hr maximum defrost timer terminates 5. Defrost Termination a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models. b) 2-min.
Comp energized ConFM energized EvapFM energized MH energized PH energized 2-min. Comp on timer starts CTh cools to 3°F (1.7°C) below setpoint. Factory default -4°F (-20°C) DTh in control DH energized DrH energized MH energized PH energized Comp de-energized ConFM de-energized EvapFM de-energized CTh warms to 3°F (1.7°C) above setpoint DTh warms to 59°F (15°C) 5.
2-min. Comp on timer starts 14 Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DrH-drain heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater CTh cools to 3°F (1.7°C) below setpoint. Factory default -4°F (-20°C) DTh in control DH energized DrH energized Comp de-energized ConFM de-energized EvapFM de-energized MH de-energized PH de-energized CTh warms to 3°F (1.7°C) above setpoint 5-hr.
B. 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. • Make sure all food zones are clean after the appliance is serviced. NOTICE • This appliance is not intended for outdoor use.
1) Move the power switch to the "OFF" position. 2) Unplug the appliance from the electrical outlet. 3) Remove the control box cover. 4) Plug the appliance back into the electrical outlet. 5) Move the power switch to the "ON" position. 6) Confirm 115VAC at the power switch. On 3-section models, also confirm proper supply voltage at the receptacle box (115VAC for refrigerator/208‑230VAC for freezer). 1a.
d) Comp and ConFM Diagnosis: Confirm Comp and ConFM energize. If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If 115VAC is present at CM C1 (R or V) to neutral (W), check for 115VAC at CR #0 (GY or P) to CR #1 (W). If 115VAC is not present, check continuity of HPS. If open, allow time for HPS to reset (cut out: 300±10 PSIG, cut in: 190±20 PSIG).
Defrost Diagnosis: 1a) Time-Initiation: 2-hr. defrost timer terminates. (1) CM Diagnosis: Confirm defrost icon turns on, "dEF" is displayed, and Comp icon turns off. If not, replace CM. (2) Comp and ConFM Diagnosis: Confirm Comp and ConFM de‑energize. If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is present, replace CM. If 115VAC is not present and Comp and ConFM continue, check CR #6 (R) to neutral (W). If 115VAC is present, replace CR.
1b. Refrigerator: Auxiliary Code F-7 and Later 7) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display. Comp, ConFM, EvapFM, and MH energize. 2-hr. defrost timer starts. a) EvapFM Diagnosis: Confirm EvapFM energizes. If not, confirm doors are closed and DS engaged. Next, check for 115VAC at DSR #8 (GY) to #7 (W). If 115VAC is not present, check DS continuity. If DS is engaged and contacts are open, replace DS.
d) Comp and ConFM Diagnosis: Confirm Comp and ConFM energize. If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If 115VAC is present at CM C1 (R or V) to neutral (W), check for 115VAC at CR #0 (GY or P) to CR #1 (W). If 115VAC is not present, check continuity of HPS. If open, allow time for HPS to reset (cut out: 300±10 PSIG, cut in: 190±20 PSIG).
Defrost Diagnosis: 1a) Time-Initiation: 2-hr. defrost timer terminates. (1) CM Diagnosis: Confirm defrost icon turns on, "dEF" is displayed, and Comp and EvapFM icons turn off. If not, replace CM. (2) Comp and ConFM Diagnosis: Confirm Comp and ConFM de‑energize. If not, check for 115VAC at CM C1 (V) to neutral (W). If 115VAC is present, replace CM. If 115VAC is not present and Comp and ConFM continue, check CR #6 (R) to neutral (W). If 115VAC is present, replace CR.
2a. Freezer: Auxiliary Code F-7 and Earlier 7) Startup/Cool Down–Lights, DrH, MH, and PH energize. There is a slight delay, then Comp, ConFM, and EvapFM energize. Cabinet temperature appears on display and 4-hr. Comp cumulative run time defrost timer starts. a) Cabinet Light FGY (FGYCR & FGYCL) Diagnosis: Open the door confirm CLS is in the ON position. If not, move CLS to the ON position. CLS turns on. If CLS does not turn on, check for 115VAC at both CLS (BK) wires to neutral (W).
f) Comp and ConFM Diagnosis: Confirm Comp and ConFM energize. If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If not in range, replace DTh. If 115VAC is present at CM C1 (R or V) to neutral (W), check for 115VAC at CR #0 (GY or P) to CR #1 (W). If 115VAC is not present, check continuity of HPS.
9) Defrost–The defrost icon turns on and "dEF" is displayed during defrost. There is a 5-min. minimum defrost time and a 1-hr. maximum defrost time. 1a) Time-Initiated: 4-hr. cumulative Comp run time defrost timer starts. Once 4-hr. cumulative Comp run time defrost timer terminates (Comp energized more than 4 hrs.). 1b) Manually-Initiated: To initiate a manual defrost, press the manual defrost button on display. Defrost icon turns on and "dEF" is displayed. DH energizes.
(3) Comp and ConFM Diagnosis: Confirm Comp and ConFM de‑energize. If not, check for 115VAC at CR #6 (R) to neutral (W). If 115VAC is present, replace CR. (4) EvapFM Diagnosis: Confirm EvapFM de-energizes. If not, check for 115VAC at DSR 4 (DBU) to neutral (W). If 115VAC is present, replace DSR. 2a) Time-Initiated Defrost-Termination: DTh warms to 59°F (15°C). If not, confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, DH de‑energizes and 3 delay timers start.
Comp and ConFM: Check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If 115VAC is present, check for 115VAC at CR #4 (BK) to neutral (W) and CR #6 (R) to neutral (W). If 115VAC is present at CR #4 (BK) to neutral (W) but not at CR #6 (R) to neutral (W), replace CR.
2b. Freezer: Auxiliary Code F-8 and Later 7) Startup/Cool Down–Lights and DrH energize. There is a slight delay, then Comp, ConFM, EvapFM, MH, and PH energize. Cabinet temperature appears on display and 5-hr. Comp cumulative run time defrost timer starts. a) Cabinet Light FGE (FGECR & FGECL) Diagnosis: Open the door confirm CLS is in the ON position. If not, move CLS to the ON position. LEDs turn on.
If Comp external protector does not reset, replace Comp external protector. If 115VAC is present, check run capacitor, start capacitor, start relay, and Comp motor windings. If ConFM is not energized, check ConFM fan blades for binding and motor winding continuity. If Comp and ConFM are energized and the cabinet does not cool down, check for a restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant charge. See nameplate for correct charge amount.
9) Defrost–The defrost icon turns on and "dEF" is displayed during defrost. There is a 5-min. minimum defrost time and a 1-hr. maximum defrost time. 1a) Time-Initiated: 5-hr. cumulative Comp run time defrost timer starts. Once 5-hr. cumulative Comp run time defrost timer terminates (Comp energized more than 5 hrs.). 1b) Manually-Initiated: To initiate a manual defrost, press the manual defrost button on display. Defrost icon turns on and "dEF" is displayed. DH energizes.
(4) EvapFM Diagnosis: Confirm EvapFM de-energizes. If not, check for 115VAC at DSR 4 (DBU) to neutral (W). If 115VAC is present, replace DSR. 2a) Time-Initiated Defrost-Termination: DTh warmes to 45°F (7.2°C). If not, confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, DH de‑energizes and 3 delay timers start. If DTh has not warmed to 45°F (7.2°C), check DT and DH continuity. Next, check DH amp draw. (1) 3-min. Comp delay timer terminates: 3 min.
2b) Manually-Initiated Defrost-Termination: Has DTh warmed to 45°F (7.2°C)? If not, confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, DH de‑energizes and 2 delay timers start. If DTh has not warmed to 45°F (7.2°C), check DT and DH continuity. Next, check DH amp draw. (1) 3-min. Comp and EvapFM delay timers terminate: 3 min. after DH de‑energizes, confirm defrost icon turns off, Comp and EvapFM icons turn on, and Comp, ConFM, EvapFM, MH, and PH energize.
C. Control Module Check 1. Control Module Display Before replacing CM that does not show a visible defect and that you suspect is bad, conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a neutral (W) to establish a good neutral connection when checking high voltages. Also, confirm there is a good power supply and neutral connection to CM: 115VAC at CM L2 (BK) to CM N3 (W). Alarm Reset: To silence the alarm, press and release the up button with power on.
4. Defrost Termination 10) Check that the components restart after defrost termination. Refrigerator: a) Auxiliary Code F-6 and Earlier: DTh reaches 40°F (4.4°C) Comp and ConFM (CM C1 (R or V)) energize. If not, check DTh status. See "II.D.Thermistor Check." If DTh ohm reading is in proper range, and components do not energize, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, check component continuity and replace as needed.
D. Thermistor Check The cabinet thermistor is used for cabinet temperature control and the defrost thermistor is used for defrost cycle initiation and termination. Thermistor resistance varies depending on temperature. The control module monitors the thermistors to control system operation. No adjustment is required. In the event the cabinet thermistor reading is out of range (E1 alarm), the compressor operates on a fixed time basis of 5-min. on and 5-min. off.
E. Diagnostic Tables Check for correct appliance installation per the instruction manual and proper voltage per appliance nameplate. 1. Not Cooling Not Cooling - Possible Cause 1. Power Supply a) Unplugged, off, blown fuse, tripped or defective circuit breaker. On three‑section receptacle box, only top receptacles have power. b) Loose connection. c) Not within specifications. 2. Cord and Plug On three-section model, check receptacle box cord and plug and one‑section and two-section cords and plugs. 3.
2. Evaporator Frozen Up Evaporator Frozen Up - Possible Cause 1. Evaporator a) Dirty. 2. Evaporator Fan Motor a) Fan blades binding. b) Defective. 3. Defrost Thermistor a) Out of position or defective. 4. Control Module a) Defective. 5. Compressor Relay a) Defective. 6. Refrigerant Charge/Refrigerant Lines a) Low. 7. Defrost Heater (freezer) a) Defective. b) Component restriction (TXV, cap tube, drier). 3. Defrost Refrigerator Defrost Fails to Initiate - Possible Cause 1.
III. Controls and Adjustments A. Control Module All models are pretested and factory set. When the power switch is moved to the "ON" position there is a slight delay, then the current cabinet temperature is displayed. From the display module, the cabinet setpoint and temperature display scale can be changed. Note: When exposed to high temperatures, a high-temperature alarm "Hi" may occur at start‑up. To silence the alarm, press and release the upper button.
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B. Temperature The temperature default scale is °F, but it can be changed to read °C. To change, see "III.B.3. Changing the Temperature Display Scale (°F or °C)" below. 1. Default Settings a) Temperature Setpoint: Model Refrigerator Freezer Auxiliary Code Temperature Setpoint F-6 and Earlier 36°F (2°C) F-7 and Later 33°F (1°C) All -4°F (-20°C) b) Temperature Display Scale: °F. 2. Temperature Setpoint The temperature setpoint is the value for the average cabinet temperature.
C. Defrost To initiate a manual defrost, press the manual defrost button briefly. The defrost icon and "dEF" appear in the display. 1. Refrigerators Refrigerators use a time-initiated, off-cycle defrost and defrost once every 2 hours. As soon as power is turned on the 2-hr. defrost timer starts. Once the 2-hr. defrost timer terminates, defrost begins. When the defrost thermistor warms to 44°F (6.6°C), defrost terminates. The minimum defrost time is 20 minutes and the maximum defrost time is 1 hour.
D. Alarm Safeties Alarm signals are designed to protect the appliance and food product. These alarms give information or warnings in the event the appliance is operating out of acceptable parameters. Should one of the alarms occur, follow the instructions in the table below to address the alarm. The alarm code flashes once every second with audible alarm. To silence the alarm, press and release the upper button.
E. Safety Devices 1. Compressor External or Internal Protector If combined temperature/amperage value is above the limit specified by the compressor manufacturer, the compressor external or internal protector operates independently to turn off the compressor. The compressor external or internal protector de-energizes the compressor until the temperature/amperage value returns to an acceptable level.
IV. Replacement of Components 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. • Move the power switch to the "OFF" position, then unplug the appliance from the electrical outlet before servicing. • Make sure all food zones in the appliance are clean after the appliance is serviced. A.
2. Brazing WARNING • R-134a and R-404A themselves are not flammable at atmospheric pressure and temperatures up to 176°F (80°C). • R-134a and R-404A themselves are not explosive or poisonous. However, when exposed to high temperatures (open flames), R-134a and R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous. • Do not use silver alloy or copper alloy containing arsenic. • Use an electronic leak detector or soap bubbles to check for leaks.
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. 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 700 (latest edition) be used. 6) A liquid charge is required when charging an R-404A system (to prevent fractionation) and optional when charging an R-134a system.
B. Important Notes for Component Replacement NOTICE • When replacing a component listed below, see the notes to help ensure proper operation. Component Notes Compressor Install a new start relay, start capacitor, and external protector (on 2-section freezers only). Compressor, Evaporator Fan Motor, Condenser Fan Motor WARNING! To reduce the risk of electric shock, be sure to reconnect the component's ground wire.
V. Maintenance WARNING • Move the power switch to the "OFF" position and unplug the appliance before performing maintenance to prevent electric shock or injury by moving parts. To reduce the risk of electric shock, do not touch the power switch or plug with damp hands. • Before performing maintenance, move all foods into another clean refrigerator or freezer. 1. Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the condenser as required. 2.
VI. Preparing the Appliance for Periods of Non-Use WARNING • When preparing the appliance for long storage, prevent the doors from closing to reduce the risk of children getting trapped. • To reduce the risk of electric shock, do not touch the attachment plug or power switch with damp hands. • When shutting down the appliance for more than one week, move the power switch to the "OFF" position and unplug the appliance. • Do not plug in/unplug the appliance to start/stop operation.
VII. Disposal WARNING When preparing the appliance for disposal, remove the door to reduce the risk of children getting trapped. Leave the shelves in place so that children may not easily climb inside. The appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations. Refrigerant must be recovered by properly certified service personnel.
VIII. Technical Information A. Electrical and Refrigerant Data Model CR1S-FGE/FGECL/FGECR/FGY/ FGYCL/FGYCR/FS/FSL/HS/HSL CF1S-FGE/FGY/FS/FSL/HS/HSL CR2S-FS/HS CR2S-FGE CR2S-FGY CF2S-FS/HS CF2S-FGE CF2S-FGY CR3S-FS/HS CF3S-FS/HS AC Supply Voltage Design Pressure (PSIG) Amperes HIGH LOW 115/60/1 Refrigerant (oz.) 134a 404A 4 240 120 11 - 9 7 7 6.2 450 250 12 7.5 - 240 120 14 - 450 250 - 17 120 1-Section 11 2-Section 12 - - 1-Section 8 2-Section 17 11 9.
B. Wiring Diagrams 1.
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11. CR3S-FS/HS Receptacle Box Connection Power Cord Receptacle Box Top Receptacle Top Receptacle To 2-Section System To 1-Section System Note: Only the top receptacles have power. Power Cord Receptacle Box Top Receptacle Top Receptacle To 2-Section System To 1-Section System Note: Only the top receptacles have power.
