Hoshizaki Hoshizaki America, Inc. Commercial Series Refrigerated Kitchen Equipment Models Reach-In S-Series “A Superior Degree of Reliability” SERVICE MANUAL www.hoshizaki.
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.................................................................................................. 4 I. General Information.........................
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.
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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 Comp Cumulative Run 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.
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 is at or below 32°F (0°C) and 4-hr. cumulative Comp run timer terminates 4.
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.
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). 1. Refrigerator 7) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display. Comp, ConFM, EvapFM, and MH energize. a) EvapFM Diagnosis: Confirm EvapFM energizes.
is energized but Comp is not, give time for Comp internal protector to cool and reset. Next, check Comp start capacitor, start relay, and Comp motor windings. If Comp does not start, replace Comp. 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.
2. Freezer 7) Startup/Cool Down– MH and PH energize. There is a slight delay, then Comp, ConFM, and EvapFM energize. Cabinet temperature appears on display. Once DTh cools to 32°F (0°C), 4-hr. Comp cumulative run timer starts. a) MH and PH Diagnosis: Confirm MH and PH energize. Check for 115VAC at MH and PH. If 115VAC is not present, confirm power supply and continuity of power switch. If 115VAC is present, check amp draw of MH and PH. If an amp reading is not present, check continuity of MH or PH.
e) 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. If HPS does not reset, see "e) HPS Activation" below.
2a) Temperature/Time Initiated Defrost-Termination: (1) DTh warms to 59°F (15°C). Defrost icon, "dEF," MH, and PH continue. DH and DrH de‑energize. 3-min. Comp delay timer starts, 7-min. EvapFM delay timer starts, and 18-min. temperature display delay timer starts. (2) 3-min. Comp delay timer terminates. "dEF," MH, and PH continue. Defrost icon turns off and Comp icon turns on and Comp and ConFM energize. (3) 4 min. later, 7-min. EvapFM delay timer terminates. Comp, ConFM, "dEF," MH, and PH continue.
(3) 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. (4) EvapFM Diagnosis: Confirm EvapFM de-energizes. If not, check for 115VAC at CM F5 (Y or W/BU) to neutral (W). If 115VAC is present, replace CM.
2b) Manually Initiated Defrost-Termination: Has DTh warmed to 59°F (15°C)? If not yet confirmed, 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 59°F (15°C), check DT and DH continuity. Next, check DH amp draw. (1) 3-min. Comp/ConFM 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, and EvapFM 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.
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. 8. Defrost Thermostat (freezer) a) Defective. b) Component restriction (TXV, cap tube, drier). 3.
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 Setting: Refrigerator: 36°F (2°C). Freezer: -4°F (-20°C). b) Temperature Display Scale: °F. 2. Temperature Setpoint The temperature setpoint is the value for the average cabinet temperature. The temperature differential for the compressor to turn on and off is ±3°F (±1.7°C) of the temperature setpoint.
C. Defrost To initiate a manual defrost, press the manual defrost button briefly. The defrost icon and "dEF" appear in the display. 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.
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-FGY(-FS)(-FSL)(-HS)(-HSL) CF1S-FGY(-FS)(-FSL)(-HS)(-HSL) CR2S-FS(-HS) CR2S-FGY CF2S-FS(-HS) CF2S-FGY CR3S-FS(-HS) CF3S-FS(-HS) AC Supply Voltage 115/60/1 115/60/1 208-230/115/60/1 Design Pressure (PSIG) Amperes HIGH LOW 4 240 120 9 450 250 7 240 120 6.2 11 450 250 9.8 12 16 240 450 120 250 Refrigerant (oz.) 134a 404A 11 7.
B. Wiring Diagrams 1.
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8. CR3S-FS/HS Receptacle Box Connection Power Cord Receptacle Box Top Receptacle To 2-Section System Top Receptacle 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.
