Hoshizaki Hoshizaki America, Inc. Commercial Series Refrigerated Kitchen Equipment Models Undercounter Worktop Prep Table “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.................................................................................................. 5 I.
VI. Preparing the Appliance for Periods of Non-Use............................................................. 30 VII. Disposal.......................................................................................................................... 31 VIII. Technical Information..................................................................................................... 32 A. Electrical and Refrigerant Data.................................................................................... 32 B.
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 • The GREEN ground wire in the factory-installed power cord is connected to the appliance. If it becomes necessary to remove or replace the power cord, be sure to connect the power cord's ground wire. • 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. Alterations could result in electric shock, injury, fire, or damage to the appliance.
WARNING, continued • All foods should be wrapped in plastic film or stored in sealed containers. Otherwise foods may dry up, pass their smells onto other foods, cause frost to develop, result in poor appliance performance, or increase the likelihood of cross‑contamination. Certain dressings and food ingredients, if not stored in sealed containers, may accelerate corrosion of the evaporator, resulting in failure. • Do not store items near air outlets.
I. Construction and Refrigeration Circuit Diagram A.
B. Refrigeration Circuit Diagram 1.
2.
II. Sequence of Operation and Service Diagnosis The steps in the sequence are as outlined below. See the table for default cabinet temperature control settings. Model Default Cabinet Temperature Approximate Default Temperature Control Setting Undercounter Between 4 and 5 Refrigerator: 34°F (1°C) Worktop Freezer: -5°F (-21°C) Prep Table 6 34°F (1°C) A. Sequence of Operation Flow Chart 1.
2. Refrigerator: Prep Table Refrigerator: Prep Table Sequence Flow Chart 3. Cool Down Achieved CTh above setpoint CTh cools to setpoint CTh in control EvapFM energized CTh closed Comp energized ConFM energized EvapFM energized 4. Defrost 20 min. DT in control CTh above setpoint 2. Cool Down CTh above setpoint 1. Startup 8-hr. DT terminates 20-min. DT terminates 20-min. DT starts 8-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.
b) CRMR60(-W), CRMR72(-W) 4) Startup–EvapFM energizes. Diagnosis: Check that EvapFM energizes. If not, check voltage on EvapFM. Check EvapFM windings. Check fan blades for binding. 5) Cool Down–Temperature above setpoint. CTh closed. EvapFM continues. Comp and ConFM energize. Diagnosis: Check that EvapFM continues. Check that Comp and ConFM energize. If not, confirm that temperature is above setpoint and CTh is closed. Check both terminals of CTh (BK) to a neutral (W) for 115VAC.
HPS Activation (CRMR60 and CRMR72 Prep Table): Check continuity of HPS. If open, allow time for system pressure to equalize and HPS to reset. If HPS does not reset, replace HPS and diagnose reason for 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).
3. Freezer: All 4) Startup/Cool Down–Temperature above setpoint. CTh closed. Comp, ConFM, EvapFM, PH, and MH energize. Diagnosis: Check that Comp, ConFM, EvapFM, PH, and MH energize. If not, confirm that the appliance is not in a defrost cycle, 8-hr. DT is operating properly, temperature is above setpoint, and CTh is closed. Check voltage on 8-hr. DT. In cooling, 115VAC is present on both DT terminal #1 (BK) and DT terminal #4 (BK) to a neutral (W).
6) Defrost–Defrost Initiation: 8-hr DT terminates. DH energizes. If CTh closed, Comp, ConFM, EvapFM, PH, and MH de-energize. Defrost Termination: 20-min. DT terminates. DH de-energizes. If CTh closed, Comp, ConFM, EvapFM, PH, and MH energize. Diagnosis: Defrost Initiation: Manually advance DT cam to terminate 8-hr. DT. Confirm DH energizes and Comp, ConFM, EvapFM, PH, and MH de‑energize or remain de‑energized. If not, replace DT. If Comp, ConFM, EvapFM, PH, and MH de‑energize, check DH.
C. Diagnostic Table Before consulting the diagnostic tables, check the following: • Check the cabinet temperature control setting. See the table for default cabinet temperature control settings. Model Default Cabinet Temperature Approximate Default Temperature Control Setting Undercounter Between 4 and 5 Refrigerator: 34°F (1°C) Worktop Freezer: -5°F (-21°C) Prep Table 6 34°F (1°C) • Make sure the doors are not left open or opened too often and that they are sealing properly.
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. Evaporator Fan 5. Compressor External Protector 6. Compressor 7. Condenser 8. Evaporator 9. Refrigerant/Refrigerant Lines 10. High-Pressure Switch CRMR60 and CRMR72 prep table, CRMF48(-01)(-W)(-W01), and CRMF60(-W) b) Loose connection. c) Not within specifications. a) Loose connection. b) Defective.
3. Defrost Fails to Initiate or Terminate Defrost Fails to Initiate or Terminate - Possible Cause 1. Defrost Timer (prep table and freezer) a) Defective.
III. Controls and Adjustments A. Temperature Settings 1. Temperature Reading A thermometer with both °F and °C scales is mounted in the cabinet. See Fig. 1. 2. Cabinet Temperature The appliance features a cabinet temperature control dial. The warmest setting is 1 and the coldest setting is 7. See the table for default cabinet temperature control settings.
C. Safety Devices 1. Compressor External or Internal Protector (All Models) If combined temperature/amperage value is above the limit specified by the compressor manufacturer, the compressor protector operates independently to turn off the compressor. The compressor protector de-energizes the compressor until the temperature/amperage value returns to an acceptable level. 2.
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 "VI.A. Cleaning". A.
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. 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 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 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 When shutting down the appliance for periods of non-use, follow the instructions below. WARNING Prevent the doors from closing to reduce the risk of children getting trapped. NOTICE Clean the cabinet interior, door gaskets, and shelves. See "VI.A. Cleaning" for details. 1) Before shutting down the appliance, move the stored food into another refrigerator or freezer. 2) Unplug the appliance.
VII. Disposal When disposing of the appliance, follow the instructions below. WARNING Remove the door to reduce the risk of children getting trapped. Leave the shelves in place so that children may not easily climb inside. This 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 Design Pressure Refrigerant (PSIG) (oz.) AC Supply Model Voltage Amperes HIGH LOW 134a CRMR27(-01)(-W)(-W01)(-8)(-12M) 115/60/1 2.6 290 120 5.6 CRMF27(-01)(-W)(-W01) 115/60/1 3.4 310 120 5.0 CRMR48(-01)(-W)(-W01) 115/60/1 2.6 240 120 6.5 CRMR48 Prep Table (-8)(-12)(-12M)(-18M) 115/60/1 2.6 290 120 6.5 CRMF48(-01)(-W)(-W01) 115/60/1 6 360 140 9.2 CRMR60(-W) 115/60/1 4.
B. Wiring Diagrams 1a.
Auxiliary Code C-5(D) and Earlier EXTERNAL b) CRMR60(-W), CRMR72(-W) 34
1b.
Auxiliary Code C-5(E) and Later b) CRMR60(-W), CRMR72(-W) 36
COMP. START CAP. Comp. Start Cap. CRMR60 andCRMR72 CRMR72 Prep Table 270/324MFD CRMR60, 270/324MFD CRMR27 andCRMR48 CRMR48 Prep Table 233/280MFD CRMR27, 233/280MFD ModelMODEL * EXTERNAL START CAP. SEE TABLE Auxiliary Code C-5(D) and Earlier 300±10 PSIG 190±20 PSIG Cut-Out Cut-In * High-Pressure Switch 2a.
190±20 PSIG Cut-In 38 Comp. Start Cap. CRMR60 and CRMR72 Prep Table 270/324MFD CRMR27 and CRMR48 Prep Table 233/280MFD Model 300±10 PSIG Cut-Out * High-Pressure Switch * START CAP. SEE TABLE Auxiliary Code C-5(E) and Later 2b.
70°F±5°F (21°C±3°C) Cut-In 39 490±10 PSIG 370±20 PSIG Cut-Out Cut-In ** High-Pressure Switch 120°F±5°F (49°C±3°C) Cut-Out * Defrost Thermostat ** * Auxiliary Code C-5(D) and Earlier DBU for auxiliary code A-5(K) and earlier 3a.
70°F±5°F (21°C±3°C) Cut-In 490±10 PSIG 370±20 PSIG Cut-Out Cut-In ** High-Pressure Switch 120°F±5°F (49°C±3°C) Cut-Out * Defrost Thermostat ** * Auxiliary Code C-5(E) and Later CRMF27(-01)(-W)(-W01)-Auxiliary code C-7 and later CRMF48(-01)(-W)(-W01) & CRMF60(-W)-All 3b.
