Service Manual Steelheart Series Refrigerated Kitchen Equipment Models Upright A-Series 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 manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary. CONTENTS Important Safety Information.................................................................................................. 5 I. General Information.........................
VIII. Technical Information..................................................................................................... 42 A. Electrical and Refrigerant Data.................................................................................... 42 B. Wiring Diagrams........................................................................................................... 43 1. R1A/R2A/F1A-FG/FGCL/FGCR/FS/FSJ/FSL/FSLJ/HG/HS/HSL, ......................... 43 PT1A-FG-FG/FS-FS/HS-HS.......................
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. DANGER WARNING NOTICE IMPORTANT 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 in death or serious injury.
WARNING The 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 WARNING, continued • Children should be properly supervised around the appliance. • Do not climb, stand, or hang on the appliance or doors or allow children or animals to do so. Do not climb into the appliance or allow children or animals to do so. Death or serious injury could occur or the appliance could be damaged. • Be careful not to pinch fingers when opening and closing the doors or when handling food pans.
I. General Information A. Construction Condenser Fan Motor Defrost Thermistor Evaporator Fan Motor 1.
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B.
Legend: BH-bottom heater Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater TXVH-thermostatic expansion valve heater Comp energized MH energized TXVH energized ConFM energized (R2A Models) EvapFM energized MH/BH energized (PT2A, R_2A) Power on 2-min. Comp on timer starts 5-min. minimum defrost DTh in control 2-hr cumulative compressor run or 2-hr continuous compressor run defrost timer terminates 4.
2-min. Comp on timer starts 12 Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DrH-drain heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater TXVH-thermostatic expansion valve heater CTh cools to 3°F (1.7°C) below setpoint. Factory default -2°F (-19°C) 5-min. minimum defrost DH energized Comp de-energized ConFM de-energized EvapFM de-energized CTh warms to 3°F (1.
B. Service Diagnosis Risque De Feu Ou D'Explosion 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.
NOTICE • This appliance is not intended for outdoor use. • Normal operating ambient temperature: – Refrigerators and Solid Door Freezers 45°F to 100°F (7°C to 38°C) – Glass Door Freezers 45°F to 80°F (7°C to 27°C) Operation of the appliance, for extended periods, outside of this normal temperature range may affect appliance performance. • 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. Refrigerator 5) Startup/Cool Down–MH, PH, and TXVH energize. There is a slight delay, Comp, ConFM, and EvapFM energize. On PT2A and R_2A, MH and BH also energize. Cabinet temperature appears on display and 2-hr. defrost timer starts. Note: If DTh is above 50°F (10°C) EvapFM is de-energized. a) MH Diagnosis: MH energizes at startup (except PT2A). If 115VAC is present, check amp draw of MH. If an amp reading is not present, check the continuity of MH. If defective, replace MH.
f) Glass Door Cabinet Light Diagnosis: LED(s) are activated from control module light switch. Glass door models feature lights that are controlled by the Standby/Light control button located on the control module. Press the standby/light button quickly to turn the light on or off. If LED(s) fail to turn on, check for 115VAC from CM 6 (LED) (Y) to a neutral (W). If 115VAC is not present at CM 6 (LED) (Y) to a neutral (W), replace CM.
6) Cool Down Achieved–MH and BH continues (de-energizes on PT2A and R_2A models). CTh cools to 3°F (1.7°C) below setpoint. Comp icon turns off and Comp and ConFM de-energize. EvapFM icon stays on and EvapFM continues. 60-sec. later, EvapFM icon turns off and EvapFM de‑energizes. a) Diagnosis: Confirm Comp icon turns off and Comp, ConFM, and MH (PT2A and R_2A models) de‑energize. If not, and Comp and ConFM were energized longer than 2 min., check CTh status. See "II.D. Thermistor Check.
2) Defrost Termination: DTh warms to 44°F (6.6°C). If not, confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, Comp icon turns on and Comp, ConFM, and MH (PT2A and R_2A models) energize. 15-min. temperature display timer starts. Once 15-min. temperature display timer terminates, "dEF" is replaced by cabinet temperature on display. (1) Comp energized: DTh warms to 44°F (6.6°C), confirm Comp icon turns on and Comp and ConFM energize.
2. Freezer 5) Startup/Cool Down– MH, PH, DrH, and TXVH energize. There is a slight delay, then Comp, ConFM, and EvapFM energize. Cabinet temperature appears on display and 5-hr. Comp cumulative run time defrost timer starts. a) MH and PH Diagnosis: PH and MH energize at startup. If 115VAC is present, check amp draw of PH and/or MH. If an amp reading is not present, check the continuity of PH and MH. If defective, replace PH or MH. b) DrH Diagnosis: Confirm amp draw of DrH.
f) Comp and ConFM Diagnosis: Confirm Comp and ConFM energize. If not, check for 115VAC at CM 1 (C) (V) to neutral (W). If 115VAC is not present, check CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in proper range, and 115VAC is not present at CM 1 (C) (V) to neutral (W), replace CM. If thermistor ohm reading is not in range, replace thermistor. If 115VAC is present at CM 1 (C) (V) to neutral (W), check for 115VAC at CUR (V) to neutral (W). If 115VAC is not present, check continuity of HPS.
7) Defrost–The defrost icon turns on and "dEF" is displayed during defrost. There is a 5-min. minimum defrost time and a 1-hr. maximum defrost time, and a 5-hr. defrost interval. 1a) Time-Initiated: 5-hr. cumulative Comp run or 4-hr. continuous Comp run defrost timer terminates (Comp energized more than 5 hrs.). Defrost icon turns on and "dEF" is displayed. DH energizes. Comp and EvapFM icons turn off. Comp, ConFM, and EvapFM de‑energize.
2) Defrost-Termination: DTh warms to 77°F (25°C). If not, confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, DH de‑energizes and 3-min. Comp delay timer starts. If DTh has not warmed to 77°F (25°C), check DT and DH continuity. Next, check DH amp draw. Once 3-min. Comp delay timer terminates, Comp icon turns on and Comp and ConFM energize. 4-min. EvapFM delay timer starts. Once 4-min. EvapFM delay timer terminates, defrost icon turns off, EvapFM icon turns on and EvapFM energizes.
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 at CM 2 (L) (BK) to CM 3 (N) (W).
4. Defrost Termination 9) Check that the components restart after defrost termination. Refrigerator: DTh reaches 44°F (6.6°C). EvapFM icon stays on and EvapFM continues. Comp and ConFM energize. If not, check DTh status. See "II.D. Thermistor Check." If DTh ohm reading is in proper range, and components do not energize, check for 115VAC at CM 1 (C) (V) to neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, check component continuity and replace as needed.
E. Diagnostic Tables Check for correct appliance installation per the instruction manual and proper voltage per appliance nameplate. 1. Not Cooling Not Cooling - Possible Cause 1. Power Supply a) Unplugged, off, blown fuse, tripped or defective circuit breaker. b) Loose connection. c) Not within specifications. 2. Cord and Plug On three-section model, check receptacle box cord and plug and one‑section and two-section cords and plugs. 3. Wiring a) Loose connection. b) Defective. a) Loose connection.
2. Evaporator Frozen Up Evaporator Frozen Up - Possible Cause 1. Evaporator a) Dirty. 2. Evaporator Fan Motor a) Fan blades binding. b) Defective. 3. Defrost Thermistor a) Out of position or defective. 4. Control Module a) Defective. 5. Refrigerant Charge/Refrigerant Lines a) Low. 6. Defrost Heater (freezer) a) Defective. b) Component restriction (TXV, cap tube, drier). 3. Defrost Refrigerator Defrost Fails to Initiate - Possible Cause 1.
III. Controls and Adjustments A. Control Module All models are pretested and factory set. When plugged into an electrical power supply, 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. Note: When exposed to high temperatures, a high-temperature alarm "Hi" may occur at start‑up. To silence the alarm, press and release the upper button.
2. Display Layout Cabinet Thermistor Defrost Thermistor Door Switch 3.
B. Temperature The temperature default 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)" below. 1. Default Settings a) Temperature Setpoint: Model Refrigerator Freezer Auxiliary Code All All Temperature Setpoint 38°F (3°C) -2°F (-19°C) b) Temperature Display Scale: °F. 2. Temperature Setpoint The temperature setpoint is the value for the average cabinet temperature.
C. Defrost To initiate a manual defrost, press the manual defrost button briefly. The defrost icon and "dEF" appear on the display. 1. Refrigerators Refrigerators use a time-initiated, off-cycle defrost. Defrost occurs when either the 2-hr. cumulative compressor run timer terminates or the 2-hr. continuous compressor run timer terminates. When either the 2-hr. cumulative compressor run timer or the 2-hr. continuous compressor run timer terminates, defrost begins. The 5-min.
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 and alarm icon flash with audible alarm. To silence the alarm, press and release the upper button.
E. Safety Devices and Light Control 1. Compressor External or Internal Protector 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. 2. Short-Cycle Protection There is a 2-min. minimum off-time and on-time for the compressor.
IV. 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. Component Service Information DANGER • Component parts shall be replaced with like components. • Les pièces des composants doivent être remplacées par des pièces et accessoires équivalents. NOTICE When replacing a component listed below, see the notes to help ensure proper operation. Component Compressor Notes Install a new start relay and compressor external protector. WARNING! To reduce the risk of electric shock, be sure to reconnect the compressor's ground wire.
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. Air Filter Check the air filter at least twice a month. When clogged, use warm water and a neutral cleaner to wash the filter. 2. Condenser Inspect the condenser air filter bi-weekly.
VI. Preparing the Appliance for Periods of Non-Use WARNING Prevent the doors from closing to reduce the risk of children getting trapped. NOTICE Clean the cabinet interior, door gaskets, and shelves. 1) Before shutting down the appliance, move the stored food into another refrigerator or freezer. 2) Unplug the appliance. WARNING! To reduce the risk of electric shock, do not touch the plug with damp hands.
VII. 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.
VIII. Technical Information A. Electrical and Refrigerant Data Model R1A-FG/FGCL/FGCR//HG R1A-FS/FSJ/FSL/FSLJ/HS/HSL PT1A-FG-FG/FS-FS/HS-HS R2A-FG/HG/FS/HS PT2A-FS-FS/HS-HS/FG-FG R3A-FS/HS AC Supply Voltage 5 4.6 8 9.5 115/60/1 RN1A-FS RT1A-FS-FS RN2A-FS RT2A-FS-FS F1A-FG/FS/FSL/HG/HS/HSL F2A-FG/HG/FS/HS F3A-FS/HS Amperes Refrigerant (oz.) R290 208-230/115/60/1 DT1A-HS 115/60/1 DT2A-FS/HS 115/60/1 4.9 5.3 4.6 Right 4.6 Left 6.4 4.6 8.2 5.1 9 9.5 4.1 4.2 4.1 Right 4.1 Left Freezer 2.
B. Wiring Diagrams 1. R1A/R2A/F1A-FG/FGCL/FGCR/FS/FSJ/FSL/FSLJ/HG/HS/HSL, PT1A-FG-FG/FS-FS/HS-HS * 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch. Glass Door LEDs Controlled Through Control Module Light Switch.
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4. PT2A-FG-FG/FS-FS/HS-HS * 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch. Glass Door LEDs Controlled Through Control Module Light Switch.
5. R3A-FG/FGCL/FGCR/FS/FSCL/FSCR/HS/HG 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch. Glass Door LEDs Controlled Through Control Module Light Switch.
6. F2A-FG/FS/HG/HS * 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch. Glass Door LEDs Controlled Through Control Module Light Switch.
7. F3A-FS/HS 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch.
* * 50 360±300 PSIG 249±10 PSIG Cut-out Cut-in * High-Pressure Switch 8.
9. DT2A-FS/HS Main Connection System Connection * 115 VAC 5 to 12VDC Solid Door LEDs Controlled Through Door Switch. Glass Door LEDs Controlled Through Control Module Light Switch.
