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Hoshizaki America, Inc.
Hoshizaki
Commercial Kitchen Equipment
Model
Refrigerated Prep Table with Raised Rail
SERVICE MANUAL
“A Superior Degree
of Reliability”
www.hoshizaki.com
Number: 73168
Issued: 8-12-2009
Revised: 5-11-2011
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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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III. Service Diagnosis ........................................................................................................... 25 A. Alarm Signals .............................................................................................................. 25 1. High Temperature Alarm (E1) ................................................................................. 27 2. Low Temperature Alarm (E2) ................................................................................. 28 3. C
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5. Door/Drawer Gaskets ............................................................................................ 59 6. Shelves (if applicable) ............................................................................................ 59 7. Drawers (if applicable) ............................................................................................ 59 B. Maintenance ................................................................................................................ 60 1. R
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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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I. Specifications A. Nameplate Ratings Design Pressure (PSIG) Refrigerant HI LO 404A Model AC Supply Voltage Amperes HPR46A(-D) 7.6 28.5 oz. HPR72A See Unit Nameplate 115/60/1 450 250 36.1 oz. HPR72A-D 13.6 HPR100A(-D) TBD TBD B. Dimensions Rail Exterior Worktop Exterior Exterior Interior Capacity Height Height Width Depth Interior Interior Interior Volume QTY of 1/6 (HE) (HW) (W) (D) Height Width Depth Model Cu. Ft. Sized Pans mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) HP
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II. General Information A. Construction This Hoshizaki unit features a cartridge-type refrigeration system that can be removed (excluding the rail evaporator). Rail Cover Rail Fan Motors and Fan Shrouds Compressor Side Panel Front Panel Receiver Tank Air Filter Drier Control Box Condenser Fan Motor Wire Cover Condenser Cabinet Evaporator Cabinet Evaporator Assembly Fan Motors Cabinet Defrost Thermistor Refrigeration Cartridge Cabinet Thermistor Defrost Thermostat Cabinet Air Duct Cabinet I
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B. Sequence of Operation The steps in the sequence are as outlined below. 1. Startup W hen the po w er s witch is in the "ON" position, the cabinet t emper atur e is displa y ed and cabinet cooling begins . W hen the po w er s witch is in the "ON" position and the r ail cooling s witch is mo v ed t o the "NORMAL" or "L O W" position, the r ail t emper atur e is displa y ed and r ail cooling begins . The "NORMAL" r ail s witch position is designed f or use when the r ail co v er is open
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(3) Both CTh and RTh reach 3.6°F (2°C) below setpoint CabFM and PH continue. RailFM continues when rail cooling switch is in the "NORMAL" position and per F9 set ting when in the "L O W" position. F or det ails , see "II.D .4.a) S witch Set tings ." C omp , C onFM, and CLL V de‑ener giz e . RLL V de-energizes for 2 seconds. RLLV energizes, then remains energized during Comp off time. 4. Cool Down Restart a) Power Switch "ON," Rail Cooling Switch "OFF" CTh warms to setpoint, the Cab
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a) Cabinet Defrost: Power Switch "ON," Rail Cooling Switch "OFF" CLLV continues, CabFM, Comp, ConFM, and PH de-energize. DH energizes and warms DTh to 49°F (9.4°C) (or the 100-minute defrost termination timer expires or DTst warms to 120°F±5°F (49°C±3°C)). When DTh reaches 49°F (9.4°C), DH de-energizes, CLLV continues and a 5 minute Comp delay timer starts. When the 5-minute Comp delay timer expires, CabFM and PH energize for 10 seconds. Comp and ConFM then energize and a 5-minute CabFM and
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C. Sequence of Operation Charts 1. Cabinet Cooling 12 Power Switch "ON," Rail Cooling Switch "OFF" Cycle Steps 1. Startup 2. Cool Down 3. Cool Down Achieved 4. Cabinet Defrost From 5 below • 2‑min ut e 2-minute Comp DTh in control Comp delay delay timer starts timer starts • 6‑hour DT CTh reaches starts 3.6°F (2°C) • 6 hour DT e xpir es , then or more resets below setpoint • 1 00‑min ut e defr ost termination timer starts CTh in control Initial startup To 5 below begins here CabFM en
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2. Cabinet and Rail Cooling 13 Power Switch "ON," Rail Cooling Switch "NORMAL" or "LOW" Position W hen in the "NORMAL" position, R ailFM oper at es contin uousl y . W hen in the "L O W" position, R ailFM oper at es contin uousl y when r ail is cooling do wn and int er mit t entl y (per F9 set ting) when r ail cool do wn is achie v ed. See "II.D .4.a) S witch Set tings" and "II.D .5. Ser vice Men u." Cycle Steps 1. Start 3. Cool Down Achieved 2. Cool Down 4. Cabinet Defrost From 6 • 2‑min u
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2. Cabinet and Rail Cooling (continued) 14 Power Switch "ON," Rail Cooling Switch "NORMAL" or "LOW" Position (continued) W hen in the "NORMAL" position, R ailFM oper at es contin uousl y . W hen in the "L O W" position, R ailFM oper at es contin uousl y when r ail is cooling do wn and int er mit t entl y (per F9 set ting) when r ail cool do wn is achie v ed. See "II.D .4.a) S witch Set tings" and "II.D .5. Ser vice Men u." 4. Cabinet Defrost • 6‑hour DT e xpir es , then r esets • 1 00‑min
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D. Control Board • A Hoshizaki e x clusiv e solid‑st at e contr ol boar d is emplo y ed in all Hoshizaki HPR46A(-D), HPR72A(-D), and HPR100A(-D) units. • All models ar e pr et est ed and f act or y set. CAUTION 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit when handling or replacing the control board. 3. Do not
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2. Control Board Layout "UP" But t on Display/Change Cabinet Setpoint Display/Change "DO WN" But t on Rail Setpoint Cabinet Temperature, Rail Temperature, Alarm Display, and Alarm Display, and Service Menu Service Menu Energy Saving Mode LED (Not used this model) "SER VICE USE ONL Y" But t on LED on for Negative Values "MANU AL DEFR OS T" b ut t on Front Board Part Number K311 Connector # 1, 2 Comp Control Relay (Brown) K341 Connector # 3, 4 Cabinet Evaporator # 1, 2
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3. Features a) LED Display and Service Lock-Out This control board uses twin LED displays to show system details and diagnostic information. For control board voltage protection, a 3A 125V fuse is incorporated into the control board circuitry. A service jumper is also provided to protect against unwanted changes to the unit's settings. This service lock-out jumper is located on the K1 51 connect or t er minals 7 and 8. See "II.D .4. C ontr ols and A djustments ." b) Compressor Short Cycle
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4. Controls and Adjustments The cabinet and rail temperatures are updated every 30 seconds. The control board is supplied with a service jumper on the K151 connector. Only the temperature setpoint and the t emper atur e scale ("F5") ma y be adjust ed with this connect or in place . T o vie w or adjust other selections , see "II.D .5. Ser vice Men u." a) Switch Settings Power Switch "OFF": Unit off (both cabinet and rail). Power Switch "ON": Cabinet temperature is displayed and cabinet cool
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c) Temperature Setpoint The temperature setpoint is the temperature setting at which the compressor turns on. The factory default temperature setpoints are 37° (3°C) for the cabinet and 33°F (1°C) for the rail (see the chart below). The temperature differential for the compressor to turn off is 3.6°F (2°C) below the temperature setpoint. The temperatures are updated every 30 seconds. If necessary, adjust the temperature setpoint as outlined below. Note: The cabinet and rail temperature set
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f) Temperature Correction Factor In cases where there is a discrepancy between the actual cabinet or rail temperature and the displayed temperature, a temperature correction factor is used to correct the displayed temperature. WARNING This unit has been factory tested with the default settings listed. Avoid using this function except to confirm that the setting is correct. If set incorrectly, the display could show an acceptable temperature even though the temperature is out of the proper
