Hoshizaki KM-1300MAH, KM-1300MWH, KM-1300MRH service manual Brazing

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5)Disconnect the Vacuum Pump, and attach a Refrigerant Service Cylinder to the High-side line. Remember to loosen the connection, and purge the air from the Hose. See the Nameplate for the required refrigerant charge. Hoshizaki recom- mends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.

6)A liquid charge is recommended for charging an R-404A system. Invert the service cylinder. Open the High-side, Service Manifold Valve.

7)Allow the system to charge with liquid until the pressures balance.

8)If necessary, add any remaining charge to the system through the Low-side. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the Low-side access port with the unit running.

9)Close the two Refrigerant Access Valves, and disconnect the Hoses and Service Manifold.

10)Cap the Access Valves to prevent a possible leak.

2.BRAZING

DANGER

1.Refrigerant R-404A itself is not flammable at atmospheric pressure and temperatures up to 176° F.

2.Refrigerant R-404A itself is not, explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decom- posed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous.

3.Always recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

4.Do not use silver alloy or copper alloy containing Arsenic.

5.Do not use R-404A as a mixture with pressurized air for leak testing. Refrigerant leaks can be detected by charging the unit with a little refrig- erant, raising the pressure with nitrogen and using an electronic leak detector.

Note: All brazing-connections in the Evaporator Case are clear-paint coated. Sandpaper the brazing-connections before unbrazing the components. Use a good abrasive cloth to remove paint.

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Contents KM-1300MAH KM-1300MWH KM-1300MRH Hoshizaki AMERICA, INC Contents Maintenance KM-1300MAH Air-cooled Specifications2a. KM-1300MWH Water-cooled 2b. KM-1300MWH Water-cooled Serial No. M10156D KM-1300MRH Remote air-cooled Condensing Unit URC-12F Specifications Model URC-12F II. General Information Construction KM-1300MWH Water-cooled KM-1300MRH Remote air-cooled Controller Board Features of Control Products E Controller BoardController Board SOLID-STATE ControlPage Freeze Cycle Beep every 3 sec. = High Evaporator Temperature 127 FMinute Fill Cycle Harvest CycleControl Products HOS-001A Board Sequence 1st Cycle 2nd Cycle and after with pump drain 2nd Cycle and after with no pump drain Controls and Adjustments Setting Time Setting Frequency Checking the Controller Board Page III. Technical Information KM-1300MWH Water-cooled KM-1300MRH Remote air-cooled KM-1300MAH Air-cooled and KM-1300MWH Water-cooled Wiring DiagramsCut-out 412 ±21.3 Psig Cut-in 327±21.3 Psig Timing Chart Page Performance Data Serial # L00001F to M10155C KM-1300MWH Water-cooled Serial # M10156D KM-1300MRH Remote air-cooled Problem Possible Cause Remedy IV. Service Diagnosis No ICE ProductionController Board Problem Possible Cause Remedy LOW ICE Production Evaporator is Frozen UPOthers Abnormal ICERefrigerant Recovery Service for Refrigerant LinesEvacuation and Recharge R-404A Brazing Removal and Replacement of Compressor Important Removal and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of HOT GAS Valve and Line Valve Removal and Replacement of Evaporator Important Page Page Page Removal and Replacement of Thermistor Important Removal and Replacement of FAN Motor Removal and Replacement of Pump Motor Removal and Replacement of Water ValveRemoval and Replacement of Spray Tubes Preparing the Icemaker for Long Storage VI. Maintenance and Cleaning InstructionsPage Cleaning Cleaning Procedure Sanitizing Procedure Following Cleaning Procedure Page Maintenance