KM-650MAH-E Service manual - Hoshizaki

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3. Evacuation and Recharge (R-404A) 1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both high and low-side refrigerant access 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. Open the gauge manifold valves. Never allow the oil in the vacuum pump to flow backwards. 3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity. 4) Close the low-side valve and high-side valve on the gauge manifold. 5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. See the nameplate on the icemaker for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used. 6) A liquid charge is required when charging an R-404A system (to prevent fractionation). Place the service cylinder on the scales; if the service cylinder is not equipped with a dip tube, invert the service cylinder, then place it on the scales. Open the high-side valve on the gauge manifold. 7) Allow the system to charge with liquid until the proper charge weight is met. 8) If necessary, add any remaining charge to the system through the low-side. NOTICE! To prevent compressor damage, use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side refrigerant shutoff valve with the icemaker running. 9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold hoses. 10) Cap the refrigerant access valves to prevent a possible leak. 52
B. Important Notes for Component Replacement NOTICE When replacing a component listed below, see the notes to help ensure proper operation. Component Compressor Thermostatic Expansion Valve Hot Gas Valve Liquid Line Valve (KM-515MAH-E) Fan Motor Pump Motor Thermistor Notes Install a new start capacitor, run capacitor, and start relay. • Attach the thermostatic expansion valve bulb to the suction line in the same location as the previous bulb. • The bulb should be between the 10 and 2 o'clock positions on the tube. • Secure the bulb with the clamp and holder, then insulate it. • Replace the strainer if applicable. • Use copper tube of the same diameter and length when replacing valve lines. Install a new capacitor. Install a new capacitor. • Attach the new thermistor to the suction line in the same location as the previous thermistor. • The thermistor should be at the 12 o'clock position on the tube. • Smoothly fill the recessed area of the thermistor holder with high thermal conductive type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound 10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu Silicones), or equivalent are recommended. • Secure the thermistor with the holder, then insulate it. • Be very careful to prevent damage to the leads. 53
Page 1 and 2: Hoshizaki America, Inc. Modular Cre
Page 3 and 4: IMPORTANT This manual should be rea
Page 5 and 6: Important Safety Information Throug
Page 7 and 8: I. Specifications A. KM-320MAH-E AC
Page 9 and 10: C. KM-650MAH-E AC SUPPLY VOLTAGE 22
Page 11 and 12: 2. KM-515MAH-E Main Transformer (23
Page 13 and 14: B. Sequence of Operation 1. Sequenc
Page 15 and 16: ) "G" Control Board KM-320MAH-E and
Page 17 and 18: 2. Sequence Flow Chart a) "E" Contr
Page 19 and 20: C. Control Board • A Hoshizaki ex
Page 25 and 26: ) Harvest Timer (S4 dip switch 1 &
Page 27 and 28: (2) Harvest Pump Timer, "G" Control
Page 29 and 30: III. Technical Information A. Water
Page 31 and 32: 2. Mechanical Bin Control KM-320MAH
Page 33 and 34: 2. KM-515MAH-E APPROXIMATE ICE AMBI
Page 35 and 36: IV. Service Diagnosis WARNING • T
Page 37 and 38: 5) Freeze Cycle - LED 1 is on. Comp
Page 39 and 40: B. Control Board Check Before repla
Page 41 and 42: 2. Mechanical Bin Control Check and
Page 43 and 44: D. Float Switch Check and Cleaning
Page 45 and 46: E. Thermistor Check To check thermi
Page 47 and 48: No Ice Production - Possible Cause
Page 49 and 50: 3. Low Ice Production Low Ice Produ
Page 51: 2. Brazing WARNING • R-404A itsel
Page 55 and 56: 1. Cleaning Procedure 1) Dilute 16
Page 57 and 58: B. Maintenance This icemaker must b
Page 59: VII. Disposal This icemaker contain

KM-650MAH-E Service manual - Hoshizaki

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