Service Manual Refrigerator R-290 Model RM-7-HC RM-10-HC RM-26-HC RM-45-SD-HC RM-49-HC RM-65-HC hoshizakiamerica.
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. General Information.......................
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. Indicates a hazardous situation that, if not avoided, will result in death or serious injury. Indicates a hazardous situation that, if not avoided, could result WARNING in death or serious injury. Indicates a situation that, if not avoided, could result in damage NOTICE to the appliance or property.
WARNING This appliance should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use. Failure to install, operate, and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage.
WARNING, continued • • • • • • • • • • • The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be properly supervised around the appliance. Do not climb, stand, or hang on the appliance or door or allow children or animals to do so.
I. General Information A.
EVAPORATOR FAN MOTOR EVAPORATOR 8 DISCHARGE DRIER COMPRESSOR SUCTION CAPILLARY LEGEND CONDENSER GAS FLOW CONDENSER FAN MOTOR B.
2. Cool Down Achieved CTh in control 3-min. Comp off 3-min. Comp on timer starts timer starts 9 Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor EvapFM-evaporator fan motor Defrost initiation occurs every 4-hrs. of cumulative compressor run time for 25-min 4. Defrost Comp energized ConFM energized EvapFM energized Defrost termination only by maximum time programmed 5. Defrost Termination Note: a) EvapFM de-energizes when door is opened on. b) 3-min.
2. Cool Down Achieved CTh in control 3-min. Comp off 3-min. Comp on timer starts timer starts CTh warms to 8°F (4°C) Factory default above 35.6°F (2°C) setpoint 3. Cool Down Restart 1. Startup/Cool Down 10 Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor EvapFM-evaporator fan motor Comp de-energized ConFM de-energized EvapFM energized Defrost initiation occurs every 4-hrs. of cumulative compressor run time for 25-min 4.
B. Service Diagnosis Risque De Feu Ou D'Explosion DANGER Le Frigorigène Est Inflammable • Suivre attentivement les instructions de manipulation conformément à la réglementation gouvernementale. • Ne pas utiliser d'appareils mécaniques pour dégivrer le réfrigérateur. • Ne pas perforer la tubulure contenant le frigorigène. Risque de feu ou d'explosion si la tubulure contenant le frigorigène est perforée; suivre les instructions de manutention avec soin.
NOTICE • • • • Normal operating ambient temperature range is from 60°F to 86°F (15°C to 30°C). Ventilation is required from the bottom front of the appliance. Keep this area open and clear of any obstructions. Adjacent cabinets and counter top can be installed around the appliance as long as the front grille remains unobstructed. The appliance must not be located next to ovens, grills, or other high heat producing equipment. The appliance must not be located in a corrosive environment.
1. Troubleshooting Check for correct appliance installation per the instruction manual and proper voltage per appliance nameplate. a) Not Cooling Not Cooling - Possible Cause 1. Power Supply 2. Cord and Plug a) Unplugged, off, blown fuse, tripped or defective circuit breaker. On three-section receptacle box, only top receptacles have power. b) Loose connection. c) Not within specifications. a) Loose connection. b) Defective. 3. Control Module See “ll.B.1.g) Alarm Safeties” and “ll.C.
b) Too Much Cooling Too much cooling - Possible Cause 1. Cabinet Thermistor a) Defective. c) Extreme Condensation Extreme condensation - Possible Cause 1. Cabinet Thermistor 3. Location a) Loose. b) Installed improperly. a) Do not shut completly (Defective gasket or hinges not adjusted). a) Inadequate location. 4. Environment a) High relative humidity (Over 75%). 2. Door d) Evaporator Frozen Up Evaporator Frozen Up - Possible Cause 1. Evaporator 2. Evaporator Fan Motor a) Dirty.
g) Alarm Safeties R LEDS Y G Mains Voltage on Compressor on Description Off.Voltage bad (too high or too low). Wait period. (Intelligent Time Delay). Allows neutralisation of refrigerant pressure. On. Voltage good. No wait time. Cooling demand. Defrost Period. Starts after 4 hours of accumulated compressor run time for 25 minutes. No cool demand (NCD). Voltage is bad. No cool demand (NCD). Wait is on. No cool demand (NCD). In cut-out zone. Test mode.
C. Control Module Check 1. Control Module Display. Before replacing CM that does not show a visible defect and that you suspect is bad, conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a neutral (W) to establish a good neutral connection when checking high voltages. Also, confirm there is a good power supply and neutral connection to CM: 115VAC. 2. Startup/Cool Down. 3. Check all wiring connections. Confirm the CTh is properly connected. 4.
D. Thermistor Check The cabinet thermistor is used for cabinet temperature control. Thermistor resistance varies depending on temperature. The control module monitors the thermistors to control system operation. No adjustment is required. The defrost initiation occurs every 4 hrs. of cumulative compressor run time with a maximum duration of 25-min. To check thermistor resistance, follow the steps below: 1. 2. 3. 4. 5. Unplug the appliance from the electrical outlet. Remove the control cover.
E. Temperature Setting Dial Marking 1 Cut-In/Cut-out: 47.0 39.0 Marking 2 Cut-In/Cut-out: 46.0 38.0 Marking 3 Cut-In/Cut-out: 45.0 37.0 Marking 4 Cut-In/Cut-out: 44.0 36.0 Marking 5 Cut-In/Cut-out: 43.0 35.0 Marking 6 Cut-In/Cut-out: 42.0 34.0 Marking 7 Cut-In/Cut-out: 41.0 33.0 Marking 8 Cut-In/Cut-out: 40.0 32.0 Marking 9 Cut-In/Cut-out: 39.0 31.
III. Refrigeration Circuit and Component Service Information DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Follow handling instructions carefully in compliance with U.S. government regulations. • Do not use mechanical devices to defrost. • Do not puncture refrigerant tubing. Risk of fire or explosion due to puncture of refrigerant tubing; follow handling instructions carefully. • Component parts shall be replaced with like components.
WARNING • Wear appropriate personal protective equipment (PPE) when servicing the appliance. • Technician must utilize a combustible gas leak detector at all times. • Notify everyone in the immediate area that you are working with flammable refrigerant. • Do not work on appliance in a confined space. Confirm area is well ventilated. • Identify and eliminate all possible ignition points in a 10 ft. (3 m) area around service area. • Do not use mechanical devices to defrost. • Use non-sparking tools.
A. Service for Refrigerant Lines WARNING • Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA-certified service personnel. • Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). Do not use R‑290 as a mixture with pressurized air for leak testing.
2. Brazing DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Servicing shall be done by factory authorized service personnel to minimize the risk of possible ignition due to incorrect parts or improper service. Risque De Feu Ou D'Explosion Le Frigorigène Est Inflammable • L’entretien doit être effectué par le personnel de service autorisé par le fabricant afin de minimiser les risques d’inflammation attribuables à l’installation d’une pièce inadéquate ou à la mauvaise exécution du service.
3. Evacuation 1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both high and low-side refrigerant piercing valves. IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils. 2) Turn on the vacuum pump, then open the gauge manifold valves. Never allow the oil in the vacuum pump to flow backwards.
B. Maintenance WARNING • • Unplug the appliance before performing maintenance to prevent electric shock or injury by moving parts. 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. Power Supply Connection If a plug, power cord, or receptacle is damaged, replace it. Be sure to connect the ground wire.
IV. Preparing the Appliance for Periods of Non-Use WARNING • • • When preparing the appliance for long storage, prevent the doors from closing to reduce the risk of children getting trapped. To reduce the risk of electric shock, do not touch the attachment plug with damp hands. When shutting down the appliance for more than one week, unplug the appliance. NOTICE • When preparing the appliance for long storage, clean the cabinet interior, door gaskets, and shelves. 1.
V. Disposal DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Follow handling instructions carefully in compliance with U.S. government regulations. • Do not puncture refrigerant tubing. Risk of fire or explosion due to puncture of refrigerant tubing; follow handling instructions carefully. • Dispose of properly in accordance with federal or local regulations.
VI. Technical Information We reserve the right to make changes in specifications and design without prior notice. A. Electrical and Refrigerant Data See the nameplate for electrical and refrigerant data. The nameplate is located inside the cabinet. Electrical and Refrigerant Data Design Pressure (PSIG) Refrigerant (oz.) Model AC Supply Voltage Amperes HIGH LOW R-290 RM-7-HC 115/60/1 1.4 300 120 2.3 RM-10-HC 115/60/1 1.8 293 135 1.8 RM-26-HC 115/60/1 3.2 274 115 2.5 RM-45-SD-HC 115/60/1 6.9 320 110 3.
B.
