Related Manuals for Hoshizaki KM1601SRH350
Summary of Contents for Hoshizaki KM1601SRH350
- Page 1 Hoshizaki Hoshizaki America, Inc. Stackable Crescent Cuber Models KM1601SRH350 KM1900SAH350 KM2100SRH350 SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com ™ Number: 73174 Issued:11-13-2009...
- Page 2 Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance. HOSHIZAKI AMERICA, INC.
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Page 3: Table Of Contents
Please retain this booklet for any further reference that may be necessary. CONTENTS I. General Information A. Construction 1. KM1601SRH350 (remote air-cooled) 2. KM1900SAH350 (air-cooled) 3. KM2100SRH350 (remote air-cooled) B. Sequence of Operation 1. One Minute Fill Cycle 2. -
Page 4: Km1601Srh350 (Remote Air-Cooled)
II. Technical Information A. Water Circuit and Refrigeration Circuit 1. KM1601SRH350 (remote air-cooled) 2. KM1900SAH350 (air-cooled) 3. KM2100SRH350 (remote air-cooled) B. Wiring Diagrams 1. KM1601SRH350 (remote air-cooled) 2. KM1900SAH350 (air-cooled) 3. KM2100SRH350 (remote air-cooled) III. Service Diagnosis A. 10-minute KM Diagnostic Procedure B. -
Page 8: Sequence Of Operation
B. Sequence of Operation The steps in the sequence are as outlined below. When power is supplied, the red "POWER OK" LED on the control board comes on. A 5-second delay occurs at startup. Note that the order of the LEDs from the outer edge of the board is 1, 4, 3, . 1. -
Page 9: Normal Harvest Cycle
5. Normal Harvest Cycle LEDs 1, 4, and are on. Comp and FMR remain energized. FMS de-energizes and the HGV and WV open. As the evaporator warms, the thermistor reaches 48°F (9°C). The control board then receives the thermistor's 3.9 kΩ signal and starts the harvest timer. -
Page 10: Sequence Flow Chart
6. Sequence Flow Chart... -
Page 11: Control Board
C. Control Board • A Hoshizaki exclusive solid-state control is employed in Stackable Crescent Cubers. • All models are pretested and factory-adjusted. CAUTION 1. Fragile, handle very carefully. . 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 before handling or replacing the board. -
Page 12: Control Board Layout
1. Control Board Layout Control Products "E" Control Board "OUTPUT TEST" Button (used to test relays on board) S4 Dip Switch "ALARM RESET" Button Backup Freeze Timer LED Connector K3 Harvest Control (thermistor) Backup Harvest Connector K4 Timer LED Open (not connected) Alarm Buzzer Microprocessor... -
Page 13: Features
2. Features a) Maximum Water Supply Period - 6 minutes The inlet water valve will be open during harvest for 6 minutes or the length of harvest whichever is shorter. b) Harvest Backup Timer and Freeze Timer The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest cycle takes more than 0 minutes to complete. -
Page 14: F) Led Lights And Audible Alarm Safeties
f) LED Lights and Audible Alarm Safeties The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. At startup, a 5 second delay occurs while the board conducts an internal timer check. A beep occurs when the control switch is moved to the "OFF" position. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. -
Page 15: Controls And Adjustments
Before changing this setting, contact Hoshizaki Technical Support at 1-800-33-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting will decrease 4 hour production. -
Page 16: C) Pump-Out Timer (S4 Dip Switch 3 & 4)
c) Pump-Out Timer (S4 dip switch 3 & 4) When a freeze cycle is completed, the pump motor stops, and the icemaker resumes operation in seconds. Then, during cycles when a pump out is called for, the pump motor drains the water tank for the time determined by the pump-out timer. The pump-out timer also acts in place of the harvest timer during cycles with a pump out. -
Page 17: F) Freeze Timer (S4 Dip Switch 9 & 10)
f) Freeze Timer (S4 dip switch 9 & 10) CAUTION Adjust to proper specification, or the unit may not operate correctly. The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze-up issues. Upon termination of the freeze timer, the control board initiates the harvest cycle. -
Page 18: Control Board Replacement
5. Control Board Replacement Before replacing a control board that does not show a visible defect and that you suspect is bad, see "II.C.4. Control Board Check Procedure." Before installing the new control board, adjust the S4 dip switches to the factory default settings. See "II.C.3.a) Default Dip Switch Settings."... -
Page 19: Float Switch Cleaning
7) Wipe down the float switch assembly's housing, shaft, float, and retainer rod and clean the inside of the rubber boot and hose with a mixture of 1 part of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) and 5 parts of warm water. Rinse the parts thoroughly with clean water. -
Page 20: Bin Control
F. Bin Control CAUTION When the ambient temperature is below 45°F (7°C), the bin control thermostat operates to stop the icemaker even if the ice storage bin is empty. When the thermostat is set in the prohibited range, the icemaker operates continuously even if the ice storage bin is filled with ice. -
Page 27: Service Diagnosis
III. Service Diagnosis A. 10-Minute KM Diagnostic Procedure The 10 minute check out procedure is basically a sequence check which can be used at unit start-up or for system diagnosis. Using this check out procedure will allow you to diagnose electrical system and component failures in approximately 10 minutes under normal operating conditions of 70°F (1°C) or warmer air and 50°F (10°C) or warmer water temperatures. - Page 28 5) Freeze Cycle – LED 1 is on. Compressor (and fan motors on remote air-cooled models) remains energized, pump motor, liquid line valve, (and self-contained fan motors on air-cooled models) energize. The inlet water valve and hot gas valve de- energize.
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Page 29: Diagnostic Charts
B. Diagnostic Charts 1. No Ice Production Problem Possible Cause Remedy [1] The icemaker will not a) Power Supply 1. Off, blown fuse, or 1. Turn on, replace, or start. tripped breaker. reset. . Loose connection. . Tighten. 3. Bad contacts. 3. - Page 30 Problem Possible Cause Remedy [1] The icemaker will not h) High Pressure Control 6. Refrigerant line or 6. Clean and replace start. (continued) (continued) components plugged. drier. 7. Condenser water 7. Check and get pressure too low or recommended off (water-cooled pressure.
- Page 31 Problem Possible Cause Remedy [3] Compressor will a) Magnetic Contactor 1. Bad contacts. 1. Check for continuity not start or stops and replace. operating. . Coil winding open. . Replace. b) Start Capacitor or Run 1. Defective. 1. Replace. Capacitor c) Internal Overload 1.
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Page 32: Evaporator Is Frozen Up
Problem Possible Cause Remedy [7] Fan motor will a) Fan Motor 1. Motor winding open. 1. Replace. not start, or is not . Bearing worn out. . Replace. operating (except 3. Wiring to fan motor. 3. Check for loose water-cooled model). connection or open, and replace. - Page 33 Problem Possible Cause Remedy [1]Freeze cycle time is c) Evaporator 1. Scaled up. 1. Clean. too long. (continued) . Damaged. . Replace. d) Spray Tubes 1. Dirty. 1. Clean. . Out of positon. . Place in position. e) Water Pump 1.
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Page 34: Low Ice Production
Problem Possible Cause Remedy []All ice formed on k) Control Board 1. Harvest timer is set 1. Adjust longer, referring evaporator does not too short. to "II.C.3. Controls and fall into bin in harvest Adjustments, b) Harvest cycle. (continued) Timer." . -
Page 35: Abnormal Ice
Problem Possible Cause Remedy [1] Freeze cycle time is m)Headmaster (C.P.R.) 1. Bypassing. 1. Replace. long. (continued) (remote condenser unit) n) Control Board 1. Float switch 1. Check and reconnect. connection loose (K5). . Defective. . Replace. See "II.C.4. Control Board Check Procedure."... -
Page 36: Other
Problem Possible Cause Remedy [] Cloudy or irregular a) Evaporator 1. Frozen up. 1. See chart . cubes. . Scaled up. . Clean 3. Damaged. 3. Replace. b) Water System 1. Water supply line too 1. Increase water line size. small;... -
Page 37: Removal And Replacement Of Components
IV. Removal and Replacement of Components IMPORTANT 1. Ensure all components, fasteners, and thumbscrews are securely in place after the equipment is serviced. . The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts. -
Page 38: Evacuation And Recharge (R-404A)
For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used. -
Page 39: Removal And Replacement Of Compressor
B. Removal and Replacement of Compressor IMPORTANT Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. Note: When replacing a compressor with a defective winding, be sure to install the new start capacitor and start relay supplied with the replacement compressor. -
Page 40: Removal And Replacement Of Expansion Valve
C. Removal and Replacement of Expansion Valve IMPORTANT Sometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. -
Page 41: Removal And Replacement Of Hot Gas Valve Or Line Valve
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve IMPORTANT 1. Always use a copper tube of the same diameter and length when replacing the hot gas valve lines; otherwise, performance may be affected. . Always install a new drier every time the sealed refrigeration system is opened. -
Page 42: Removal And Replacement Of Evaporator
E. Removal and Replacement of Evaporator IMPORTANT Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repairs or replacement have been made. 1) Turn off the power supply. ) Remove the panels and the front and top insulation. - Page 43 6) Install the new condenser assembly, then attach the side frame in its correct position. 7) Remove the drier, then place the new drier in position. 8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 9) Use an electronic leak detector or soap bubbles to check for leaks.
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Page 44: Removal And Replacement Of Condenser - Remote Model
13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 14) Close the drain valve(s). Open the condenser water supply line shut-off valve. If connected to a closed loop water supply, also open the condenser return outlet shut-off valve. -
Page 45: Removal And Replacement Of Headmaster - Remote Model
J. Adjustment of Water Regulating Valve - Water-Cooled Models The water regulating valve (also called "water regulator") is factory-adjusted. No adjustment is required under normal use. Adjust the water regulator, if necessary, using the following procedures. 1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure gauge to the high-side line of the system. -
Page 46: Removal And Replacement Of Thermistor
9) 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-404A as a mixture with pressurized air for leak testing. -
Page 47: Removal And Replacement Of Fan Motor
11) Connect the thermistor leads through the bushing of the control box to the K3 connector on the control board. CAUTION Do not cut the leads of the thermistor. 1) Replace the control box cover and the panels in their correct positions. 13) Turn on the power supply. -
Page 48: Removal And Replacement Of Pump Motor
11) Check for leaks. 1) Replace the front panel in its correct position. 13) Turn on the power supply. O. Removal and Replacement of Pump Motor 1) Turn off the power supply. ) Remove the front panel and the insulation panel. Cube Guide Separator 3) Drain the water tank by removing the cap... -
Page 49: Cleaning And Maintenance
4. Never run the icemaker when the water tank is empty. 1. Cleaning Procedure 1) KM1601SRH350: Dilute 27 fl. oz. (800 ml) of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY," (Economics Laboratory, Inc.) with 5 gal. (19 l) of warm water. - Page 50 7) In bad or severe water conditions, clean the float switch assembly as described below. Otherwise, continue to step 8. a. Disconnect the vent tube and the flush tube from the top of the float switch, then remove the float switch assembly from the mounting bracket and remove the rubber boot from the bottom of the assembly.
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Page 51: Sanitizing Procedure - Following Cleaning Procedure
2. Sanitizing Procedure - Following Cleaning Procedure 1) KM1601SRH350: Dilute 2.5 fl. oz. (74 ml or 5 tbs) of a 5.25% sodium hypochlorite solution (chlorine bleach) with 5 gal. (19 l) of warm water. KM1900SAH350 and KM2100SRH350: Dilute 3.5 fl. oz. (104 ml or 7 tbs) of a 5.25% sodium hyprochlorite solution (chlorine bleach) with 7 gal. -
Page 52: Maintenance Instructions
B. Maintenance Instructions IMPORTANT This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. 1. Stainless Steel Exterior To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up. - Page 53 55) Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring. While holding the valve open, blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out. 6) Close the drain valve(s) and replace the right side panel in its correct position.1 1.