Hoshizaki Hoshizaki America, Inc. Commercial Series Refrigerated Kitchen Equipment Models Refrigerated Prep Table with Raised Rail Refrigerated Equipment Stand “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 booklet carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information.................................................................................................. 4 I.
Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, 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 • Do not use an appliance 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 appliance, be sure to pull the plug, not the cord, and do not jerk the cord. • Do not splash, pour, or spray water directly onto or into the appliance. This might cause short circuit, electric shock, corrosion, or failure. • Do not make any alterations to the appliance.
WARNING, continued CPT Models • Do not throw anything onto the shelves or load any single shelf with more than 120 lb. (54.5 kg) of product. They might fall off and cause injury. • Do not load any single drawer with more than 150 lb. (68 kg) of product. Depending on the weight of product in the drawers, secure the unit as necessary to prevent it from overturning. Do not open more than one drawer at a time. • The entire rail must always be covered by rail dividers and pans.
NOTICE • Protect the floor when moving the appliance to prevent damage to the floor. • Keep ventilation openings, in the appliance enclosure or in the built-in structure, clear of obstruction. The factory-installed rear bumpers must be in place to ensure proper rear clearance. Blockage of airflow could negatively affect performance and damage the appliance. • To prevent deformation or cracks, do not spray insecticide onto the plastic parts or let them come into contact with oil.
I. Construction and Refrigeration Circuit Diagram A. Construction 1.
2.
B. Refrigeration Circuit Diagram 1.
Startup 2-min. Comp off timer starts DTh in control 11 Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DTh-defrost thermistor EvapFM-evaporator fan motor a) 2-min. minimum Comp on timer starts when Comp energizes. b) 2-min. minimum Comp off timer starts when Comp de-energizes. c) 5-min. minimum defrost time. d) 1-hr. maximum defrost time. e) "dEF" displayed during defrost.
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.
CRES Factory Default Temperature Settings: a) Setpoint: 35°F (2°C). b) Display Scale: °F. For further details, see "III. Controls and Adjustments." Note: There is a minimum 2-min. Comp on time and 2-min. Comp off time. 1) Unplug the appliance from the electrical outlet. 2) Remove the front panel. 3) Plug the appliance back into the electrical outlet. 4) Confirm 115VAC at CM L2 (BK or BR) to neutral (W).
6) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues. Comp and ConFM de‑energize. Diagnosis: Confirm Comp and ConFM de‑energize. If not, and Comp and ConFM were energized longer than 2 min., check CTh status. See "II.C. Thermistor Check." If CTh ohm reading is in range and Comp and ConFM were energized longer than 2 min., check for 115VAC at CM C1 (BR or BK) to neutral (W). If 115VAC is present, replace CM. 7) Defrost– 6-hr.
(3) Comp/ConFM/CRES EvapFM Diagnosis: Confirm Comp, ConFM, and EvapFM de‑energize. If not, check for 115VAC at CM C1 (BR or BK) to neutral (W). If 115VAC is present, replace CM. (4) CPT EvapFM Diagnosis: Confirm EvapFM de-energizes. If not, check for 115VAC at CM F5 (DBU) to neutral (W). If 115VAC is present, replace CM. 2) Defrost-Termination: There is a 5 min. minimum defrost time and a 1 hr. maximum defrost time. Has 5-min. minimum defrost timer terminated? Confirm DTh status. See "II.C.
C. Thermistor Check The cabinet thermistor is used for cabinet temperature control and the defrost thermistor is used for defrost cycle initiation (39°F (3.8°C), defrost termination (41°F (5°C), and EvapFM initiation after defrost (36°F (2°C) or lower). Thermistor resistance varies depending on temperature. The control module monitors the thermistors to control system operation. No adjustment is required. To check thermistor resistance, follow the steps below. 1) Unplug the appliance.
D. Diagnostic Table Check for correct appliance installation per the instruction manual and proper voltage per appliance nameplate. 1. Appliance Not Cooling Appliance Not Cooling - Possible Cause 1. Power Supply a) Unplugged, blown fuse, or tripped or defective circuit breaker. 2. Power Cord and Plug 3. Wiring 4. Control Module See "III.D. Alarm Safeties." 5. Compressor External Protector 6. Compressor 7. Condenser 8. Evaporator Fan 9. Evaporator 10. Refrigerant/Refrigerant Lines 11.
2. Evaporator is Frozen Up Evaporator is Frozen Up - Possible Cause 1. Evaporator a) Dirty. 2. Evaporator Fan Motor 3. Defrost Thermistor 4. Control Module a) Defective. b) Fan blade binding. c) Defrost thermistor defective. d) Control module defective. a) Out of position or defective. a) Defective. 5. Refrigerant Charge/Refrigerant Lines a) Low. b) Component restriction (cap tube, drier). 6. Defrost Heater 7. Defrost Timer a) Defective. a) Defective. 8. Defrost Safety Thermostat a) Defective. 3.
III. Controls and Adjustments A. Control Module When the power cord is plugged in there is a slight delay, then the current cabinet temperature is displayed. From the control module, the cabinet setpoint and temperature display scale can be changed. All models are pretested and factory set. NOTICE • The control module is fragile, handle very carefully. • Do not change wiring and connections. Never misconnect terminals. • Do not short out power supply to test for voltage. 1.
3. Control Module Rear Layout Defrost Thermistor Fig. 2 Cabinet Thermistor 4.
B. Temperature The default temperature 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)." 1. Default Temperature Settings a) CPT Setpoint: 32°F (0°C). b) CRES Setpoint: 35°F (2°C). c) 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.
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.
IV. Refrigeration Circuit and Component Service Information WARNING • This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • To reduce the risk of electric shock, do not touch the plug with damp hands. • Unplug the appliance from the electrical outlet before servicing. • Make sure all food zones in the appliance are clean after the appliance is serviced. For cleaning procedures, see the instruction manual.
2. Brazing WARNING • R-134a itself is not flammable at atmospheric pressure and temperatures up to 212°F (100°C). • R-134a itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-134a 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 the requirements of ARI Standard 700 (latest edition) be used. 6) A liquid charge is recommended when charging an R-134a system.
C. CPT Door Reversal This appliance is provided with a cabinet design which, after being delivered to the installation location, permits changing of the door swing from left to right or right to left. To change the door swing, follow the steps below. Example shows change from right hinged to left hinged. WARNING • Wear eye protection when reversing the doors. • Keep fingers away from edge of upper hinge bracket. Spring cartridge can cause the upper hinge bracket to move suddenly with extreme force.
7) Remove the filler cap, filler screws, and spring cartridge. See Fig. 7. Leave the thrust‑washers in place on the spring cartridge. NOTICE! Spring cartridge may be difficult to remove. Be careful not to damage the finish. Screws Filler Cap Thrust-Washers Filler Screws Fig. 7 Spring Cartridge Door 8) Clear material from the spring cartridge hole to allow for spring cartridge installation. Reinstall the filler cap, filler screws, and spring cartridge on the opposite side of the door. See Fig. 8.
9) Make sure the thrust-washers are in place on the spring cartridge, then install the upper hinge bracket onto the spring cartridge. See Fig. 9. The upper hinge bracket should be canted out towards the center as shown with the screw holes towards the back of the appliance. 10) Remove the filler cap and nylon bearing from the bottom of the door. See Fig. 10. Reinstall on the opposite side. Screw Washer Screw Holes Upper Hinge Bracket Thrust-Washers Door Filler Cap Fig. 9 Fig.
V. Maintenance The maintenance schedule below is a guideline. More frequent maintenance may be required depending on the appliance's environment, and local sanitation regulations. WARNING • 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 plug with damp hands. • Before servicing: Move all foods into another clean refrigerator or freezer.
VI. Preparing the Appliance for Periods of Non-Use When shutting down the appliance for more than one week, follow the instructions below. WARNING When preparing the appliance for long storage, prevent the doors/drawers from closing to reduce the risk of children getting trapped. NOTICE When preparing the appliance for long storage, clean the appliance. See the instruction manual for cleaning details. 1) Before shutting down the appliance, move all foods into another clean refrigerator or freezer.
VII. Disposal When disposing of the appliance, follow the instructions below. WARNING When preparing the appliance for disposal, remove the doors/drawers 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 CPT46(-D) CPT67(-D), CPT93(-D) CRES36 CRES49 CRES72 CRES85 CRES98 Design Pressure Refrigerant (PSIG) (oz.) AC Supply Voltage Amperes HIGH LOW 134a 115/60/1 3.7 290 120 6.5 115/60/1 5.5 290 120 11.6 115/60/1 4.3 330 120 8.5 115/60/1 3.7 330 120 8.5 115/60/1 4.3 330 120 8.5 115/60/1 4.3 330 120 8.5 115/60/1 4.3 330 120 8.5 See the nameplate for electrical and refrigeration specifications. The nameplate is located inside the cabinet.
70°F±5°F (21°C±3°C) Cut-in 33 300±10 PSIG 190±20 PSIG Cut-out Cut-in * High-Pressure Switch 120°F±5°F (49°C±3°C) Cut-out ** Defrost Thermostat * Yellow (Y) CPT67 Auxiliary Code D-5(B) and Earlier CPT67(-D) & CPT93(-D) ** CPT67(-D) & CPT93(-D) B. Wiring Diagrams 1.
300±10 PSIG 190±20 PSIG Cut-out Cut-in * High-Pressure Switch * ** 120°F±5°F (49°C±3°C) 70°F±5°F (21°C±3°C) Cut-out Cut-in ** Defrost Safety Thermostat EVAPORATOR FAN MOTOR (CRES49) EVAPORATOR FAN MOTOR (CRES72, CRES85, CRES98) 2.
