Hoshizaki Hoshizaki America, Inc. Commercial Series Refrigerated Kitchen Equipment Models Reach-In B-Series “A Superior Degree of Reliability” SERVICE MANUAL www.hoshizaki.
IMPORTANT Only qualified service technicians should install, service, and maintain the unit. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, component life, and warranty coverage. Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the unit.
IMPORTANT This manual should be read carefully before the unit is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the unit. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information............................................................................................
D. Diagnostic Chart.......................................................................................................... 35 1. Unit Not Cooling...................................................................................................... 35 2. Evaporator is Frozen Up......................................................................................... 36 3. Defrost Fails to Terminate....................................................................................... 36 V.
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 unit. WARNING Indicates a hazardous situation which could result in death or serious injury. CAUTION Indicates a situation which could result in damage to the unit. IMPORTANT Indicates important information about the use and care of the unit.
• Make sure the power switch is in the "OFF" position before plugging in or unplugging the unit to reduce the risk of electric shock. • Do not use a unit with a damaged power cord. The power cord should not be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could result in electric shock or fire. To unplug the unit, be sure to pull the plug, not the cord, and do not jerk the cord. Before unplugging a 4-prong plug, rotate the plug counter-clockwise to unlock it.
I. Specifications A. Nameplate Ratings Model CR1B-FS/HS CF1B-FS/HS CR2B-FS/HS CF2B-FS/HS CR3B-FS/HS AC Supply Voltage 115/60/1 Design Pressure (PSIG) Amperes HIGH LOW 4 240 120 9 450 250 7 240 120 11 450 250 115/60/1 CF3B-FS/HS 208-230/115/60/1 9 16 240 450 120 Refrigerant (oz.) 134a 404A 11 8 12 17 1-Section 11 2-Section 12 - - 1-Section 8 2-Section 17 250 See the nameplate for electrical and refrigeration specifications. The nameplate is located inside the cabinet.
2. One Section/Two Section/Three Section Unit: mm (in.) Top View Door Exterior Exterior Opening Door Opening Door Exterior Height Depth Door Opening Height Height Swing Model Width (W) (H) (D) Width (DW) (DH) (DHU/DHL) (DS) Front View Model One Section Two Section Three Section One Section 698.5 (27.5) Two Section 1397 (55) Three Section 2108.2 (83) 579 (22.8) 1920.5 (75.61) 852.9 (33.58) 593.7 (23.37) 1513.6 (59.59) 713.3/710.3 651.3 (28.08/27.96) (25.64) 593.7 579 (23.37) (22.
II. General Information A. Construction 1.
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B. Sequence of Operation 1. Sequence Cycles and Shutdown The steps in the sequence are as outlined below. Note: 1. There is a slight delay at startup. 2. When power is turned on, the 2-hour high-temperature alarm timer is bypassed. Therefore, a high-temperature alarm can occur at startup. To silence the alarm, press and release the upper button. Alarm clears once temperature is within factory parameters. For details, see "II.D.2. Alarm Safeties." 3.
b) Freezer 1. Startup/Cool Down MH and PH energize. There is a slight delay before cabinet temperature or high‑temperature alarm (Hi) appears on DM and Comp, ConFM, and EvapFM energize. 2. Cool Down Achieved CM monitors cooling of the cabinet via CTh. CTh cools to 3°F (1.7°C) below setpoint. EvapFM, MH, and PH continue. Comp and ConFM de-energize. 3. Cool Down Restart CTh warms to 3°F (1.7°C) above setpoint. EvapFM, MH, and PH continue. Comp and ConFM energize. 4. Defrost "dEF" is displayed during defrost.
CTh in control 2-min. Comp on timer starts 14 2-min. Comp off timer starts CTh cools to 3°F (1.7°C) below setpoint. Factory default 36°F (2°C) DTh in control DTh cools to 8.6°F (-13°C) EvapFM energized MH energized Comp de-energized ConFM de-energized CTh warms to 3°F (1.7°C) above setpoint 4. Defrost Comp energized ConFM energized EvapFM energized MH energized delay timer starts 2-min. temperature display DTh warms to 40°F (4.4°C) 5.
Comp energized ConFM energized EvapFM energized MH energized PH energized 2-min. Comp on timer starts Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater MH energized PH energized Power on Slight Delay at Startup CTh cools to 3°F (1.7°C) below setpoint.
C. Display Module 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. For further details, see "II.C.2. Controls and Adjustments." Note: When power is turned on, the 2-hour high-temperature alarm timer is bypassed. Therefore, a high-temperature alarm can occur at startup. To silence the alarm, press and release the upper button.
2. Controls and Adjustments a) Default Settings 1. Temperature Setting: Refrigerator: 36°F (2°C). Freezer: -4°F (-20°C). 2. Temperature Display Scale: F. b) 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. For example, for a refrigerator temperature setpoint of 36°F (2°C), the compressor comes on at 39°F (3.
D. Control Module All models are pretested and factory set. CAUTION 1. The control module is fragile, handle very carefully. 2. Do not change wiring and connections. Never misconnect terminals. 3. Do not short out power supply to test for voltage. 1.
2. Alarm Safeties Alarm signals are designed to protect the unit and food product. These alarms give information or warnings in the event the unit 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. Compressor Overload, Short Cycle Protection, and High-Pressure Switch 1. Compressor External or Internal Overload If combined temperature/amperage value is above the limit specified by the compressor manufacturer, the compressor overload operates independently to turn off the compressor. The compressor overload de-energizes the compressor until the temperature/amperage value returns to an acceptable level.
III. Technical Data A.
B. Wiring Diagrams 1.
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5. CR3B-FS/HS Receptacle Box Connection Note: Only the top receptacles have power. 6. CF3B-FS/HS Receptacle Box Connection Note: Only the top receptacles have power.
IV. Service Diagnosis WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices. 3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear. 4. Make sure all food zones are clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning Instructions." A.
1. Refrigerator 7) Startup/Cool Down–EvapFM and MH energize. There is a slight delay, then Comp and ConFM energize and cabinet temperature or high-temperature alarm (Hi) appears on DM. a) Startup Diagnosis: Check that EvapFM energize. If not, confirm that the door(s) are closed and DS contacts are closed. Check EvapFM blades for binding. Next, check for 115VAC at DSR terminals 7 and 8. If 115VAC is not present, check DS continuity.
8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM and MH continue. Comp and ConFM de‑energize. Diagnosis: If Comp and ConFM do not de-energize, confirm CTh status. See "IV.C. Thermistor Check." If CTh ohm reading is in range and Comp and ConFM do not de-energize, CM is defective and must be replaced. 9) Defrost Temperature-Initiated Defrost: DTh cools to 8.6°F (-13°C). EvapFM and MH continue. Comp and ConFM de-energize. Defrost Termination: DTh warms to 40°F (4.4°C).
2. Freezer 7) Startup/Cool Down–MH and PH energize. There is a slight delay, then Comp, ConFM, and EvapFM energize and cabinet temperature or high-temperature alarm (Hi) appears on DM. Once DTh reaches 32°F (0°C), 4-hour Comp cumulative run timer starts. a) Startup Diagnosis: Check that EvapFM energize. If not, confirm that the door(s) are closed and DS contacts are closed. Check EvapFM blades for binding. Next, check for 115VAC at DSR terminals 7 and 8. If 115VAC is not present, check DS continuity.
c) HPS Activation: Confirm ConFM is energized and fan blade turns freely. Check that the condenser coil is not clogged or restricted. Check that there are no restrictions in the refrigeration circuit (drier, TXV). Confirm that the location meets factory requirements: • This unit is not intended for outdoor use. Normal operating ambient temperature should be within 45°F to 100°F (7°C to 38°C). • The unit should not be located next to ovens, grills, or other high heat producing equipment.
Defrost Termination: Has DTh warmed to 59°F (15°C)? If not yet confirmed, confirm DTh status. See "IV.C. Thermistor Check." If DTh is good but defrost termination temperature is not reached, confirm DH amp draw and continuity. If DTh is good and defrost termination temperature is reached, DH de‑energizes and 3 delay timers start. 3-minute Comp delay timer terminates: Have Comp and ConFM energized after DH is de-energized for 3 minutes? If not, check for 115VAC between CM C1 and CM N5.
B. Control Module Check Before replacing a control module that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a white (W) neutral wire to establish a good neutral connection when checking high voltages. Also, confirm that there is a good neutral connection to the control module terminal N5. Alarm Reset: To silence the alarm, press and release the upper or lower button with power on.
"IV.A.2.9) Defrost" and "IV.C. Thermistor Check." If components fail to start, control module must be replaced. C. Thermistor Check In the event the cabinet thermistor reading is out of range (E1 alarm), the compressor operates on a fixed time basis of 5-minutes on and 5-minutes off. In the event the refrigerator defrost thermistor reading is out of range (E2 alarm), defrost initiation occurs every 4-hours of cumulative compressor run time and terminates on 20-minute minimum defrost timer.
D. Diagnostic Chart Before consulting the diagnostic charts, check the following: • Check the setpoint. For factory default settings, see "II.C.2.a) Default Settings." • Make sure the doors are not left open or opened too often and that they are sealing properly. • Make sure the cabinet is not overloaded with warm or hot product or product blocking airflow. Product should be allowed to cool before putting in the unit. • Check for correct installation and proper voltage per unit nameplate.
Unit Not Cooling - Possible Cause 11. Compressor Overload a) Dirty condenser. b) Condenser fan not operating. c) Defective. 12. Compressor a) Defective. 13. Condenser a) Dirty. 14. Evaporator See "2. Evaporator is Frozen Up." 15. Refrigerant/Refrigerant Lines a) Clogged or frozen. a) Gas leak. b) Refrigerant lines restricted. 2. Evaporator is Frozen Up Evaporator is Frozen Up - Possible Cause 1. Evaporator a) Dirty. 2. Evaporator Fan a) Not operating. 3.
V. Replacement of Components WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Move the power switch to the "OFF" position, then unplug the unit from the electrical outlet before servicing. 3. Make sure all food zones in the icemaker and storage bin are clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning and Maintenance Instructions." A.
2. Brazing WARNING 1. R-134a and R-404A themselves are not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. 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. 3. Do not use silver alloy or copper alloy containing arsenic. 4. Use an electronic leak detector or soap bubbles to check for leaks.
4) Close the low-side valve and high-side valve on the gauge manifold. 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.
B. Important Notes for Component Replacement CAUTION 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 compressor overload (compressor overload is integrated with the start relay on refrigerators; internal on 1-section freezers; external on 2-section freezers).
VI. Cleaning and Maintenance Instructions A. Cleaning WARNING 1. Before cleaning the unit, move the power switch to the "OFF" position and unplug the unit to prevent electric shock by unexpected entrance of water into the unit or injury by moving parts. 2. Before cleaning the unit, move all foods into another clean refrigerator or freezer. 3. Do not splash water directly onto the unit. This might cause short circuit, electric shock, corrosion, or failure. 4.
C. Shutdown and Long Storage WARNING 1. When preparing the unit for long storage, prevent the doors from closing to reduce the risk of children getting trapped. 2. To reduce the risk of electric shock, do not touch the attachment plug or power switch with damp hands. 3. 115V Units: To unplug the unit, be sure to pull the plug and do not jerk the power cord. It could be damaged and cause fire or electric shock. 4.
