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Hoshizaki America, Inc.
Hoshizaki
Commercial Series
Refrigerated Kitchen Equipment
Models
Reach-In B-Series
SERVICE MANUAL
“A Superior Degree
of Reliability”
www.hoshizaki.com
Number: 73183
Issued: 3-23-2011
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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. Should th
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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 ............................................................................
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D. Diagnostic Chart ......................................................................................................... 35 1. Unit Not Cooling ..................................................................................................... 35 2. Evaporator is Frozen Up ........................................................................................ 36 3. Defrost Fails to Terminate ...................................................................................... 36 V. Repl
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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. WARNING This unit should be destined only to the use for which it has been expres
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• 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. •
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I. Specifications A. Nameplate Ratings Design Pressure (PSIG) Refrigerant (oz.) AC Supply Model Voltage Amperes HIGH LOW 134a 404A CR1B-FS/HS 4 240 120 11 - CF1B-FS/HS 9 450 250 - 8 115/60/1 CR2B-FS/HS 7 240 120 12 - CF2B-FS/HS 11 450 250 - 17 1-Section 11 CR3B-FS/HS 115/60/1 9 240 120 - 2-Section 12 1-Section 8 CF3B-FS/HS 208-230/115/60/1 16 450 250 - 2-Section 17 See the nameplate for electrical and refrigeration specifications. The nameplate is located inside the cabinet. Note: We reserve
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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) One 698.5 579 Section (27.5) (22.8) Two 1397 1920.5 852.9 593.7 1513.6 713.3/710.3 651.3 Section (55) (75.61) (33.58) (23.37) (59.59) (28.08/27.96) (25.64) Three 2108.2 593.7 579 Section (83) (23.37) (22.8) Front View Side View Interior View Additional Dimensions Door St
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II. General Information A. Construction 1. One Section Condenser Fan Motor Thermostatic Expansion Valve Compressor Condenser Control Box Control Module Front Panel Power Cord Float Switch for Door Lock Condensate Pump Condensate Pump Power Switch Door Reservoir Display Module Cover Reservoir Light Door Switch Door Gasket • Evaporator • Cabinet Thermistor • Defrost Thermistor • Evaporator Fan Shroud Model Shown: CR1B-FS Models CR1B-FS/HS and CF1B-FS/HS 9
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2. Two Section Thermostatic Expansion Valve Condenser Fan Motor Compressor Condenser Power Switch Front Panel Control Box Control Module Float Switch Door Switch Reservoir Cover Door Lock Condensate Pump Reservoir Power Cord Light Display Module Door Switch Door Latch Door Door Gasket • Evaporator • Cabinet Thermistor • Defrost Thermistor • Evaporator Fan Shroud Model Shown: CR2B-HS Models CR2B-FS/HS and CF2B-FS/HS 10
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3. Three Section Receptacle Box Top Receptacles Have Power Control Lower Receptacles Do Not Module Condensate Control Box Pump Thermostatic Expansion Valve Thermostatic Expansion Valve Condenser Fan Motor Condenser Fan Motor Condenser Condenser Control Box Reservoir Front Panel Cover Compressor Float Switch Power Switch Door Switch Door Lock Power Cords Control Door Lock Power Module Switch Reservoir Condensate Display Pump Module Light Power Cord CR3B-FS/HS Display Module Power Cord
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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. There is a 2-minute minimum Comp on time
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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 displa
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2. Sequence Flow Charts a) Refrigerator 14 Refrigerator Sequence Flow Chart 2. Cool Down Achieved 1. Startup/Cool Down 4. Defrost 5. Defrost Termination 3. Cool Down Restart CTh warms DTh cools to DTh warms to CTh cools 40°F (4.4°C) to 3°F (1.7°C) to 3°F (1.7°C) 8.6°F (-13°C) Slight below setpoint. above Delay at 2-min. temperature display Factory default setpoint Startup delay timer starts 36°F (2°C) CTh in control DTh in control 2-min. Comp on 2-min. Comp off timer starts timer start
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b) Freezer 15 Freezer Sequence Flow Chart 1. Startup/Cool Down 2. Cool Down Achieved 4. Defrost 5. Defrost Termination 3. Cool Down Restart DTh is at or below 32°F (0°C) DTh warms to 59°F (15°C) CTh cools to and 4-hour cumulative Comp DTh reaches 32°F (0°C), 3-min. Comp delay timer starts 3°F (1.7°C) CTh warms run timer terminates then 4-hour cumulative (EvapFM starts with Comp on manual below setpoint. to 3°F (1.7°C) Slight Comp run timer starts defrost restart) Factory default above
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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 butt
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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 (3.7°C), and the comp
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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. Control Module Layout Freezer Control Module Refrigerator Control Module To Display Module To Display Module Display Cable Display Cable Defrost Thermistor Defrost Thermistor Cabinet Thermistor Cabinet Thermistor F6 Evaporator Fan Motor (black)
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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. Alarm Signals Alarm Code Problem Corrective Action/Reset Details Cabinet Thermistor Malfun
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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. • If the condenser fan motor is operating and the compressor is off, it is most like
