Instruction/ maintenance manual of the product KM-501MAH Hoshizaki
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1 Hoshizaki “A Superior Degree of Reliability” www .hoshizaki.com Models KM-501MAH KM-501MWH KM-501MRH Modular Crescent Cuber Hoshizaki America, Inc.
2 IMPOR T ANT Only qualified ser vice technicians should attempt to ser vice or maintain this icemaker . No such ser vice or maintenance should be under taken until the technician has thoroughly read this Ser vice Manual.
3 Please re vie w this manual. It should be read carefully bef ore the icemak er is ser viced or maintenance operations are perf or med. Only qualified ser vice technicians should ser vice and maintain the icemaker . This manual should be made a v ailab le to the technician prior to ser vice or maintenance.
4 III. T echnical Inf or mation ...................................................................................................... 23 A. W ater Circuit and Refr igeration Circuit ....................................................................
5 AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 13 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP.
6 2. KM-501MWH (water-cooled) Note: We reserve the right to make changes in specifications and design without prior notice. AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 10 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP.
7 3. KM-501MRH (remote air-cooled) Note: We reserve the right to make changes in specifications and design without prior notice. AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 15 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP.
8 B. Condensing Unit 1. URC-6F 24" (610 mm.) 23-1/32" (585 mm.) 19-11/16" (500 mm.) 18-1/8" (460 mm.) 20-15/32" (520 mm.) 21-15/16" (557 mm.) 7/8" DIA. HOLE (23 mm. DIA.) 6-5/16" (160 mm.) 2-15/16" (75 mm.) 18-1/8" (460 mm.
9 SPECIFICA TIONS MODEL: URC-6F Galvaniz ed Steel 21-15/16" x 15-11/16" x 17-7/8" (557 x 398 x 453.8 mm.) R404A 1 lb . 2 oz. (505 g) Net 61 lbs. (28 kg) Shipping 68 lbs. (31 kg) One Shot Couplings (P ar ker) P er manent Connection Air-cooled Condensing Pressure Regulator Min.
10 II. General Information A. Construction 1. KM-501MAH (air-cooled) Spr a y T ubes W ater Supply Inlet Control Switch Condenser Hot Gas V alve Expansion V alve F an Motor C o n d e n s e r Compressor.
11 2. KM-501MWH (water-cooled) Spra y T ubes W ater Supply Inlet Control Switch W ater Regulator Expansion V alve Hot Gas V alve Compressor Float Switch Drier W ater Pump Control Box Bin Control Ther .
12 3. KM-501MRH (remote air-cooled) Spra y T ubes W ater Supply Inlet Control Switch Junction Bo x Expansion V alve Receiv er T ank Compressor Float Switch Drier W ater Pump Hot Gas V alv e Line V alv.
13 B. Sequence of Operation The steps in the sequence are as outlined below . When po wer is supplied, a 5 second dela y occurs at star tup . Note that the order of the LEDs from the outer edge of the board is 1, 4, 3, 2. 1. One Minute Fill Cycle LED 4 is on.
14 KM-501MAH, KM-501MWH, KM-501MRH Sequence Flow Chart and Component Operation 1. One Minute Fill Cycle 2. Har vest Cycle 3. Freez e Cycle 4. Pump-Out Cycle Cycle Steps WV Energized F/S open F/S closed Comp energized HGV energized FMR energized WV continues Thermistor temp reaches 48°F (9°C) (3.
15 C. Control Boar d • A HOSHIZAKI e xclusiv e solid-state control is emplo yed in KM-501MAH, KM-501MWH and KM-501MRH Modular Crescent Cubers. • All models are pretested and f actor y-adjusted.
16 Control Boar d P ar t Number 2A1410-01 (f actor y); 2A1410-02 (service) T ype HOS-001A (Control Products - 10 Pin) Contr ol Pr oducts "E" Contr ol Boar d 1.
17 2. Features a) Maximum W ater Supply P eriod – 6 minutes Inlet water v alve opening, in the harvest cycle , is limited by the harvest timer . The water v alv e cannot remain open longer than the maximum period. The w ater v alv e can close in less than six minutes if the harvest cycle is completed.
18 f) LED Lights and A udible Alarm Saf eties The red LED indicates proper control v oltage and will remain on unless a control v oltage problem occurs . At star tup a 5 second delay occurs while the board conducts an internal timer check. A shor t beep occurs when the power s witch is tur ned OFF .
19 3. Controls and Adjustments a) Default Dip Switch Settings The dip s witch is f actor y-adjusted to the follo wing positions: Dip Switch No . 1 2 3 4 5 6 7 8 9 10 KM-501MAH OFF ON OFF OFF ON ON OFF.
20 c) Harvest Timer (dip switch 1 & 2) The har v est timer star ts counting when the ther mistor reads 48°F (9°C) at the e v aporator outlet. No adjustment is required under nor mal use, as the harvest timer is adjusted to the suitable position.
21 e) Pump-Out Frequency Contr ol (dip s witch 5 & 6) The pump motor drains the w ater tank at the frequency set b y the pump-out frequency control. The pump-out frequency control is f actor y-adjusted to drain the w ater tank e very 10 cycles, and no adjustment is required.
22 4. Control Boar d Chec k Procedure Bef ore replacing a control board that does not sho w a visible def ect and that you suspect is bad, alwa ys conduct the f ollowing chec k procedure.
23 III. T echnical Inf ormation A. W ater Cir cuit and Refrigeration Circuit 1. KM-501MAH (air-cooled).
24 2. KM-501MWH (water-cooled).
25 3. KM-501MRH (remote air-cooled).
26 B. Wiring Diagrams 1. KM-501MAH (air-cooled) and KM-501MWH (water -cooled) * Pressure Switch Air-Cooled Model W ater-Cooled Model Cut-out 412± 21 PSIG 384± 21 PSIG Cut-in 327±21 PSIG 284±21 PSI.
27 2. KM-501MRH (remote air-cooled) * * Pressure Switch Cut-out 412± 21 PSIG Cut-in 327±21 PSIG 0.
28 C. Timing Chart *1 The icemaker does not complete a harvest cycle in the first 2 or 3 min utes. See "II.C .3. Controls and Adjustments.".
29 *1 The pump motor waits f or 2 seconds before starting a pump-out drain cycle. See "II.C.3. Controls and Adjustments." *2 The icemaker does not complete a harvest cycle in the first 2 or 3 min utes. See "II.C .3. Controls and Adjustments.
30 70/21 498 226 474 215 433 197 80/27 480 218 442 201 397 180 90/32 474 215 416 189 372 169 lbs./day kg./da y 100/38 463 210 406 184 332 150 70/21 80/27 90/32 watts 100/38 70/21 245 0.93 199 0.75 177 0.67 80/27 210 0.79 139 0.53 139 0.53 90/32 199 0.
31 2. KM-501MWH (water-cooled) Note: 1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used f or ref erence only . 2. W e reser v e the right to make changes in specifications and design without prior notice.
32 3. KM-501MRH (remote air-cooled) Note: 1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used f or ref erence only . 2. W e reser v e the right to make changes in specifications and design without prior notice.
33 IV . Service Diagnosis A. 10-Minute KM Diagnostic Pr ocedure The 10 minute chec k out procedure is basically a sequence chec k which can be used at unit star t-up or for system diagnosis .
34 freeze with the float s witch remov ed, replace the board. Note: Nor mal freeze cycle will last 20 to 40 min utes depending on model and conditions.
35 Prob lem P ossible Cause Remedy 3. Ambient or condenser water temper ature too warm. 3. Reduce temperature. 4. Refrigerant ov ercharged. 4. Recharge. 5. F an not operating. (e xcept water-cooled model) 5. See char t 1.[6] 6. Refrigerant line or components plugged.
36 Prob lem P ossible Cause Remedy m) Interlock Switch Open (Cleaning V alve) 1. Misaligned. 1. Realign. 2. Bad contacts. 2. Check f or continuity and replace. n) W ash Switch 1. W ASH position. 1. Mov e to ICE position. 2. Bad contacts. 2. Check and replace .
37 Prob lem P ossible Cause Remedy 2. Clogged. 2. Clean. 3. Pump out check v alv e leaking by . 3. Check assemb ly and clean. d) Pump Motor 1. Motor winding opened. 1. Replace. 2. Bearing wor n out. 2. Replace. 3. Wiring to pump motor . 3. Check f or loose connection or open, and replace.
38 2. Evaporator is Fr ozen Up Prob lem P ossible Cause Remedy [1] F reeze cycle time is too long. a) Float Switch 1. Leads shor t-circuit or def ectiv e s witch. 1. Check and replace . 2. Float does not mov e freely . 2. Clean or replace. b) Inlet Water V alve 1.
39 Prob lem P ossible Cause Remedy g) W ater Supply Line 1. T oo small; requires 3/8" OD line dedicated per machine. 1. Increase water line size . h) W ater Filter 1. Flow rate too small. 1. Replace with filter that has larger flow r ate. 3. Low Ice Pr oduction Prob lem P ossible Cause Remedy [1] F reeze cycle time is long.
40 Prob lem P ossible Cause Remedy 2. Mounting pad out of position. 2. Reinstall. d) Refrigerant Lines 1. Rub or touch other lines or surf aces. 1. Replace. [3] Ice in storage bin often melts. a) Drain Line(s) 1. Plugged. 1. Clean. b) Icemaker and Bin 1.
41 V . Remo v al and Replacement of Components IMPOR T ANT Ensure all components, f asteners and thumbscrews are securely in place after the equipment is ser viced. IMPOR T ANT 1. The P oly ol Ester (POE) oils used in R-404A units can absorb moisture quickly .
42 8) If necessar y , add any remaining charge to the system through the lo w-side. Use a throttling v alv e or liquid dispensing de vice to add the remaining liquid charge through the low-side access por t with the unit running. 9) Close the two refrigerant access v alv es , and disconnect the hoses and ser vice manif old.
43 4) Remov e the ter minal cov er on the compressor , and disconnect the compressor wiring. 5) Remov e the discharge and suction pipes using brazing equipment. 6) Remov e the hold-down bolts, w ashers and r ubber grommets . 7) Slide and remov e the compressor .
44 E. Remov al and Replacement of Expansion V alve IMPOR T ANT Sometimes moisture in the refrigeration circuit e xceeds the drier capacity and freezes up at the e xpansion valv e. Alwa ys install a new drier ev er y time the sealed refrigeration system is opened.
45 1) T ur n off the power supply . 2) Remov e the panels. 3) Recov er the refr igerant and store it in an appro v ed container . 4) Remov e the screw and the solenoid. 5) Disconnect the hot gas v alv e or line v alv e using brazing equipment. 6) Install the new v alve .
46 10) Ev acuate the system, and charge it with refrigerant. For air-cooled and w ater-cooled models, see the nameplate f or the required refr igerant charge . For remote air-cooled models, see the charge label in the machine compar tment. 11) Replace the remov ed par ts in the re verse order of which the y were remov ed.
47 2) Fiv e minutes after a freez e cycle star ts, confirm that the ther mometer reads 104°F to 115°F (40°C to 46°C). If it does not, rotate the adjustment screw b y using a flat blade screwdriv er until the temperature is in the proper r ange. See Fig.
48 10) Replace the panels in their correct positions. 11) T ur n on the power supply . K. Remov al and Replacement of Thermistor IMPOR T ANT 1. F ragile , handle v er y carefully .
49 L. Remov al and Replacement of Fan Motor Note: When replacing a fan motor with def ective winding, it is recommended that a ne w capacitor be installed. 1) T ur n off the power supply . 2) Remov e the panels. 3) Remov e the junction box co ver from the remote condenser unit (remote air-cooled model).
50 7) Remov e the closed end connectors from the pump motor leads. 8) Remov e the screw attaching the pump motor assemb ly to the base, then remo ve the pump motor assembly . 9) Remov e the screw attaching the pump motor to the pump motor brac ket. 10) Remov e the screws attaching the pump housing to the pump motor .
51 VI. Cleaning and Maintenance Instructions IMPOR T ANT Ensure all components, f asteners and thumbscrews are securely in place after any maintenance or cleaning is done to the equipment. A. Cleaning and Sanitizing Procedures W ARNING 1. HOSHIZAKI recommends cleaning this unit at least once a year .
52 1. Cleaning Procedure 1) Dilute appro ximately 16 fl. oz. of the recommended cleaner Hoshizaki "Scale A wa y" or "LIME-A-W A Y" (Economics Laborator y , Inc.) with 3 gal. of water . 2) Remov e all ice from the ev aporator and the storage bin.
53 20) Remov e the front panel, and fully open the cleaning valv e. 21) Mov e the control switch to the "W ASH" position. 22) Replace the front panel in its correct position. 23) T ur n on the power supply to rinse off the cleaning solution.
54 2. Storage Bin and Scoop • W ash y our hands bef ore remo ving ice. Use the plastic scoop provided (Accessory). • The storage bin is f or ice use only . Do not store anything else in the bin. • K eep the scoop clean. Clean it by using a neutr al cleaner and rinse thoroughly .
55 2. Remov e the water from the potab le water supply line: 1) Remov e the front panel (except w ater-cooled model). 2) Mov e the control switch on the control bo x to the "OFF" position. 3) W ait 3 minutes . 4) Close the potable w ater supply line shut-off valv e and open the potable water supply line drain v alve .
An important point after buying a device Hoshizaki KM-501MAH (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Hoshizaki KM-501MAH yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Hoshizaki KM-501MAH - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hoshizaki KM-501MAH you will learn all the available features of the product, as well as information on its operation. The information that you get Hoshizaki KM-501MAH will certainly help you make a decision on the purchase.
If you already are a holder of Hoshizaki KM-501MAH, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Hoshizaki KM-501MAH.
However, one of the most important roles played by the user manual is to help in solving problems with Hoshizaki KM-501MAH. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hoshizaki KM-501MAH along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
