Instruction/ maintenance manual of the product KMD-700MWH Hoshizaki
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™ SER VICE MANUAL KMD-700MAH KMD-700MWH KMD-700MRH KMD-900MAH KMD-900MWH KMD-900MRH MODULAR CRESCENT CUBER R eliability is a beautiful thing TM ITEM #: 73107 REVISED: July 28, 2006 ISSUED: June 2, 2.
2 Only qualified service technicians should attempt to service or maintain this icemaker. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual.
3 Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or maintenance.
4 3. Timing Char t ............................................................................................................... 4 4 4. P erf or mance Data .............................................................................................
5 I. Specifications 1. KMD-700MAH We reserve the right to make changes in specifications and design without prior notice. A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA GE 13. 5 A ( 5 Mi n. Freez e A T 104°F / W T 80°F) MI N I MU M C I R C U I T AMP AC I T Y 14 .
6 2. KMD-700MWH We reserve the right to make changes in specifications and design without prior notice. A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA G E 12 A ( 5 M i n. F reez e A T 104°F / W T 80°F) MI N I MU M C I R C U I T A MPA C I T Y 1 2.
7 We reserve the right to make changes in specifications and design without prior notice. 3. KMD-700MRH A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA G E 13 A ( 5 M i n. F reez e A T 104°F / W T 80°F ) MI N I MU M C I R C U I T A MPA C I T Y 1 3.
8 4. KMD-900MAH We reserve the right to make changes in specifications and design without prior notice. A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA G E 15 A ( 5 M i n. F reez e A T 104°F / W T 80°F ) MI N I MU M C I R C U I T A MPA C I T Y 1 5.
9 5. KMD-900MWH We reserve the right to make changes in specifications and design without prior notice. A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA G E 14 A ( 5 M i n. F reez e A T 104°F / W T 80°F ) MI N I MU M C I R C U I T A MPA C I T Y 1 4.
10 6. KMD-900MRH A C S UPP LY V OLT A GE 208-230 / 60/ 1 (3 wire w i t h neut ral f or 115V ) A M P E RA G E 14 A ( 5 M i n. F reez e A T 104°F / W T 80°F ) MI N I MU M C I R C U I T A MPA C I T Y 1 4.65 A MAX I MU M FUSE SI Z E 25 A APPR O X I M AT E I C E PR O D U C T I O N Amb ie n t W AT ER T EMP.
11 7. Condensing Unit URC-12F.
12 Specifications MODEL: URC-12F EXTERIOR DIMENSIONS (W x D x H) REFRIGERANT CHARGE URC-12F WEIGHT CONNECTIONS REFRIGERANT ELECTRICAL CONDENSER HEAD PRESSURE CONTROL AMBIENT CONDITION Galvanized Steel 35 - 11/16” x 15-11/16” x 21-15/16” (907.2 x 398 x 557.
13 II. General Information 1. Construction [a] KMD-700MAH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER CONDENSER FAN MOTOR CONDENSER JUNCTION BOX HOT GAS VALVE WATER SUP.
14 [b] KMD-700MWH WATER REGULATOR CONDENSER CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE.
15 [c] KMD-700MRH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER RECEIVER TANK JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE LINE VALVE.
16 [d] KMD-900MAH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER CONDENSER FAN MOTOR CONDENSER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE.
17 [e] KMD-900MWH WATER REGULATOR CONDENSER CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE.
18 [f] KMD-900MRH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER RECEIVER TANK JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE LINE VALVE.
19 2. Controller Board [a] Solid-State Control 1) A HOSHIZAKI exclusive solid-state control is employed in KMD Modular Crescent Cubers. 2) A printed circuit board (hereafter called “controller board”) includes a stable and high quality control system.
20 2) Defrost Timer The defrost cycle starts when the float switch opens and completes the freeze cycle. But the defrost timer does not start counting until the thermistor senses 48°F at the evaporator outlet.
21 The green LEDs 1-4 represent the corresponding relays and energize and sequence 5 seconds from initial startup as follows: {LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV} The built in safeties shut down the unit and have alarms as follows: The Output Test switch “S3” provides a relay sequence test.
22 (Control Products HOS-001A Board) The application switch located between relay X3 & X4 must be set to match the original board application. Place this switch in the ALP position if there is no white wire supplied to the K1 connector. If there is a white wire, place the switch in the C position.
23 [c] Sequence 1st Cycle 1. Unit energized and control switch to “ICE” position. Water supply cycle starts. 2. After 1 minute, defrost cycle starts. 3. Thermistor reads 48°F. Defrost timer starts counting. IMPORTANT Water valve opening is limited to 6 minutes.
24 2nd Cycle and after with pump drain IMPORTANT Freeze cycle time is limited to 60 minutes even if float switch does not open. 1. Float switch opens and signals to complete freeze cycle. Drain timer starts counting. 2. Drain timer stops counting. Pump drain is completed 3.
25 2nd Cycle and after with no pump drain IMPORTANT Freeze cycle time is limited to 60 minutes even if float switch does not open. 1. Float switch opens and signals to complete freeze cycle. 2. Thermistor reads 48°F. Defrost timer starts counting. IMPORTANT Water valve opening is limited to 6 minutes.
26 Switch Nos. 9 and 10: Used for adjustment of freeze timer. The freeze timer determines maximum freeze cycle time. Upon termination of freeze timer, machine initiates the harvest cycle. After 2 consecutive timer terminations, machine will shut down, possibly indicating a problem.
27 1) Defrost Control A thermistor (semiconductor) is used for a defrost control sensor. The resistance varies depending on the suction line temperatures. The thermistor detects the temperature of the evaporator outlet to start the defrost timer. No adjustment is required.
28 3) Drain Timer The drain timer is factory-adjusted, and no adjustment is required. SETTING TIME Dip Switch Dip Switch No. 3 No. 4 T1 T2 OFF OFF 10 seconds 150 seconds ON OFF 10 seconds 180 seconds .
29 6) Bin Control 5) Freeze Timer CA UTION Adjust to proper specification, or the unit may not operate correctly. Two new dip switches numbered 9 and 10 have been added to the improved “E” board to better prevent possible freeze ups. These settings come factory set to the default setting of 60 min.
30 (iv) After step (iii), de-energize the unit and confirm that the defrost timer is in the minimum position. Disconnect the resistor from the controller board, and energize the unit. After the 1 minute water supply cycle, the defrost cycle starts. Reconnect a 1.
31 3. Mechanical Bin Control [a] Proximity Switch 1) This machine uses a lever-actuated proximity switch (hereafter called “mechanical bin control”) to control the ice level in the storage bin. [b] Explanation of Operation 1) The startup and shutdown of the ice machine is controlled via the controller board.
32 [c] Troubleshooting 1) Machine will not start (i) Move dip switch no. 7 to the “OFF” position. If the machine starts up within a few seconds, the bin control is the likely problem. If the machine does not start up, refer to section “IV. Service Diagnosis” to verify that non-bin control related issues are resolved.
33 III. T echnical Inf ormation 1. W ater Circuit and Refrigerant Cir cuit [a] KMD-700MAH and KMD-900MAH * Note: KMD-900M_H models have two expansion valves.
34 [b] KMD-700MWH and KMD-900MWH * Note: KMD-900M_H models have two expansion valves..
35 [c] KMD-700MRH and KMD-900MRH * Note: KMD-900M_H models have two expansion valves..
36 2. Wiring Diagrams [a1] KMD-700MAH and KMD-700MWH (auxiliary code R-0 and earlier) Note: Pressure Switch MAH Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0 21 0 MWH Cut-out 384 ± PSIG Cut-in 284 .
37 [a2] KMD-700MAH and KMD-700MWH (auxiliary code R-1 and later) Note: Pressure Switch MAH Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0 21 0 MWH Cut-out 384 ± PSIG Cut-in 284 ± 21 PSIG.
38 [b1] KMD-700MRH (auxiliary code R-0 and earlier) Note: Pressure Switch Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0.
39 [b2] KMD-700MRH (auxiliary code R-1 and later) Note: Pressure Switch Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0.
40 [c1] KMD-900MAH and KMD-900MWH (auxiliary code R-0 and earlier) Note: Pressure Switch MAH Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0 21 0 MWH Cut-out 384 ± PSIG Cut-in 284 ± 21 PSIG.
41 [c2] KMD-900MAH and KMD-900MWH (auxiliary code R-1 and later) Note: Pressure Switch MAH Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0 21 0 MWH Cut-out 384 ± PSIG Cut-in 284 ± 21 PSIG.
42 Note: Pressure Switch Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0 [d1] KMD-900MRH (auxiliary code R-0 and earlier).
43 [d2] KMD-900MRH (auxiliary code R-1 and later) Note: Pressure Switch Cut-out 412 ± PSIG Cut-in 327 ± 21 PSIG 21 0.
44 3. Timing Chart Note: *1 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See “II. 2. [d] Controls and Adjustments.” *2 The bin control will only shut off the ice mac.
45 Note: *1 The pump motor waits for 2 seconds before starting a drain cycle. See “II. 2. [d] Controls and Adjustments.” *2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes.
46 4. P erformance Data [a] KMD-700MAH Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for reference only. We reserve the right to make changes in specifications and design without prior notice. 70/ 21 696 316 650 295 593 269 80/ 27 661 300 589 267 536 243 90/ 32 650 295 539 244 483 219 lb s.
47 [b] KMD-700MWH 70/ 21 701 318 675 306 634 288 80/ 27 681 309 640 290 597 271 90/ 32 675 306 611 277 569 258 lb s./da y kg ./d a y 100/ 38 665 302 601 2 73 530 240 70/ 21 80/ 27 90/ 32 wat t s 100/ 38 70/ 21 676 2. 56 715 2. 71 915 3. 46 80/ 27 706 2.
48 [c] KMD-700MRH 70/ 21 730 331 715 324 655 297 80/ 27 719 326 696 316 614 278 90/ 32 715 324 679 308 605 275 lb s./da y kg ./d a y 100/ 38 690 313 662 3 00 538 244 70/ 21 80/ 27 90/ 32 wat t s 100/ 38 70/ 21 385 1. 46 336 1. 27 303 1. 15 80/ 27 348 1.
49 [d] KMD-900MAH 70/ 21 875 397 842 382 767 348 80/ 27 850 386 799 362 706 320 90/ 32 842 382 763 346 676 307 lb s./da y kg ./d a y 100/ 38 817 370 743 3 37 596 270 70/ 21 80/ 27 90/ 32 wat t s 100/ 38 70/ 21 507 1. 92 436 1. 65 390 1. 48 80/ 27 453 1.
50 [e] KMD-900MWH 70/ 21 886 402 859 390 816 370 80/ 27 865 392 823 373 777 352 90/ 32 859 390 793 360 747 339 lb s./da y kg ./d a y 100/ 38 848 385 782 3 55 705 320 70/ 21 80/ 27 90/ 32 wat t s 100/ 38 70/ 21 978 3. 70 1023 3. 87 1260 4. 77 80/ 27 1013 3.
51 [f] KMD-900MRH 70/ 21 906 411 878 398 814 369 80/ 27 885 401 842 382 763 346 90/ 32 878 398 812 368 737 335 lb s./da y kg ./d a y 100/ 38 857 389 795 3 60 669 303 70/ 21 80/ 27 90/ 32 wat t s 100/ 38 70/ 21 465 1. 76 407 1. 54 372 1. 41 80/ 27 421 1.
52 IV . Ser vice Diagnosis 1. No Ice Production Pr ob le m Po s s ible C a us e R e m e d y [ 1] a) Power S uppl y 1. OF F po s i t i on. 1. M ov e t o O N pos i t i on. 2. Loos e c onnec t i on. 2. Ti ght en. 3. B ad c ont ac t s . 3. Chec k f or c ont i nui t y a nd repl ac e.
53 P ro bl em P ossi bl e Cause Remed y [ 1] Cont i nued f rom prev i ous page. l) C o ntr o ll e r Bo a r d 1 . D e fe ctive . 1 . Se e "II.2 [e ] C h e c kin g th e Cont rol l er B oard. " m) 1. O F F Po s iti o n 1 . Mo ve to O N po s iti o n .
54 Pr ob le m Po s s ible C a us e R e m e d y [ 3] Cont i nued f rom prev i ous page. h ) C o n tr o ll e r Bo a r d 1 . D e fe ctive . 1 . Se e "II.2 [e ] C h e ck i n g th e Cont rol l er B oard. " i ) Wat e r Regul at or [ Wat er - c o ol ed m odel onl y ] 1.
55 2. Evaporator is Frozen Up Pr ob le m Po s s ible C a us e R e m e d y [ 1 ] a) F l oat S wi t c h 1. Leads s hort -c i rc u it or d e fe ct ive sw it ch . 1. Chec k and re pla c e. 2. Fl oat does not m ov e fr e e ly. 2. Cl ean o r repl ac e . b) Wat er S ol enoi d V alv e 1.
56 4. Abnormal Ice 5. Other 3. Low Ice Production P ro bl em P o ssi bl e Cause Rem edy [1 ] a ) b) [2 ] H ar vest cycle ti me is l ong. a) S ee c hart 1. [ 3] an d c h ec k hi gh pres s ure c ont rol and wat er regulat or. S ee c hart 2. [ 1] an d c h ec k f l oat s wi t c h, wat er s ol enoi d v al v e and c ont rol ler board.
57 V . Remo val and Replacement of Components IMPOR T ANT 1. 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. 2. Always install a new filter drier every time the sealed refrigeration system is opened.
58 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 recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No.
59 3. Removal and Replacement of Compressor IMPORT ANT 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.
60 15) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the charge label in the machine compartment. 16) Connect the terminals, and replace the terminal cover in its correct position.
61 4. Removal and Replacement of Drier IMPORT ANT 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. 1) Turn off the power supply. 2) Remove the panels.
62 3) Recover the refrigerant and store it in an approved container. 4) Remove the insulation and the expansion valve bulb on the suction line. 5) Remove the expansion valve cover, and disconnect the expansion valve using brazing equipment. 6) Braze the new expansion valve, with nitrogen gas flowing at a pressure of 3-4 PSIG.
63 IMPOR T ANT 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. 1) Turn off the power supply. 2) Remove the panels. 3) Recover the refrigerant and store it in an approved container.
64 7. Removal and Replacement of Evaporator IMPOR T ANT 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.
65 8. Remo val and Replacement of W ater Regulating V alve (W ater-Cooled Model Only) IMPOR T ANT 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.
66 9. Adjustment of W ater Regulating V alve (W ater -Cooled Model Only) The water regulating valve (also called “water regulator”) is factory-adjusted. No adjust- ment is required under normal use. Adjust the water regulator, if necessary, using the following procedures.
67 10. Removal and Replacement of Condensing Pressure Regulator (C.P .R.) (Remote Air-Cooled Model Onl y) IMPORT ANT 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.
68 11. Remo val and Replacement of Thermistor CA UTION 1. Fragile, handle very carefully. 2. Always use a recommended sealant (high thermal conductive type), Model KE4560RTV manufactured by Shinetsu Silicone, Part Code 60Y000-11, or Part Code 4A0683-01 equivalent.
69 Min. 4-3/4" Liquid Bypass Flow 10) Secure the insulation using the plastic cable ties. 11) Connect the thermistor leads through the bushing of the control box to the K3 connector on the controller board. Note: Do not cut the leads of the thermistor while installing it.
70 13. Remo val and Replacement of W ater V alve 1) Turn off the power supply. 2) Close the water supply line shut-off valve. 3) Remove the front panel. 4) Remove the valve outlet tubing by releasing the clamp. 5) Remove the bracket from the unit. 6) Remove the fitting nut and water valve.
71 8) Remove the closed end connectors from the pump motor leads. 9) Remove the two screws and the pump motor bracket. 10) Remove the pump housing, and check the impeller. 11) If the impeller is defective, install a new impeller. 12) Install the new motor or new parts, and replace the removed parts in the reverse order of which they were removed.
72 16. Removal and Replacement of Bin Control 1) Turn off the power supply. 2) Remove the front panel and top panel. 3) Remove the two thumbscrews securing the switch cover. 4) Lift the bin control assembly out of the icemaker. 5) Lift off the insulation, then remove the two thumbscrews attaching the bin control to the switch cover.
73 VI. Cleaning and Maintenance Instructions 1. Preparing the Icemaker for Long Storage IMPOR T ANT When shutting off the icemaker for an extended time, drain out all water from the water line and remove the ice from the storage bin. The storage bin should be cleaned and dried.
74 [2] Remove the water from the potable water supply line: 1) Remove the front panel. (Except water-cooled models) 2) Move the control switch on the control box to the “OFF” position. 3) Wait 3 minutes. 4) Close the potable water supply line shut-off valve and open the potable water supply line drain valve.
75 Fig. 5 T op View Drain Plug W ater Shield Overflow Cap Overflow Pipe Cube Guide (A) Cube Guide (B).
76 2. Cleaning Instructions W ARNING 1. HOSHIZAKI recommends cleaning this unit at least once a year. More frequent cleaning, however, may be required in some existing water conditions. 2. To prevent injury to individuals and damage to the icemaker, do not use ammonia type cleaners.
77 Note: To remove cubes on the evaporator, turn off the power supply and turn it back on after 3 minutes. The defrost cycle starts and the cubes will be removed from the evaporator.
78 19) Turn on the power supply to fill the water tank with water. 20) Turn off the power supply after 3 minutes. 21) Remove the front panel, and fully open the cleaning valve. 22) Move the control switch to the “WASH” position. 23) Replace the front panel in its correct position.
79 [b] Sanitizing Procedure - Following Cleaning Procedure 1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with water (Add approxi- mately 1.25 fl. oz. to 2.5 gal. of water). 2) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and pulling it toward you.
80 3. Maintenance IMPOR T ANT 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.
An important point after buying a device Hoshizaki KMD-700MWH (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 KMD-700MWH 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 KMD-700MWH - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hoshizaki KMD-700MWH you will learn all the available features of the product, as well as information on its operation. The information that you get Hoshizaki KMD-700MWH will certainly help you make a decision on the purchase.
If you already are a holder of Hoshizaki KMD-700MWH, 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 KMD-700MWH.
However, one of the most important roles played by the user manual is to help in solving problems with Hoshizaki KMD-700MWH. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hoshizaki KMD-700MWH 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
