Hoshizaki F-450MAH User Manual

Hoshizaki “A Superior Degree of Reliability” www.hoshizaki.com Models F-450MAH(-C) Modular Flaker Hoshizaki America, Inc. SERVICE MANUAL Issued: 8-

10Fig. 3EDOCTRAP10-503734LEDOM10C441AA2HGNITARzH06/05CAV421T.ces51±062T.ces22±093T.ces54±0514Tsselro.ces15T%07±.ces7.66T%07±.ces7.6

11Functions of Terminals1) Terminals 1, 2Power supply AC 24V.2) Terminals 3, 4Control X1 (GM) and X2 (CM) Relays.When closed, energize X1 (GM) in 1 se

12III. Technical Information1. Water Circuit and Refrigeration Circuit

132. Wiring Diagram[a] F-450MAH

14[b] F-450MAH-C

153. Sequence of Electrical Circuit[a] When power switch is moved to “ON” position and flush switch to “ICE” position,water starts to be supplied to r

16[b] When reservoir has been filled, gear motor starts immediately.

17[c] Compressor starts about 60 sec. after gear motor starts.

18[d] Bin control operates, and about 6 sec. later, compressor and gear motor stopsimultaneously.

19[e] Low water (except water-cooled model).

2IMPORTANTOnly qualified service technicians should install, service, and maintain theicemaker. No service or maintenance should be undertaken until t

20[f] When flush switch is moved to “FLUSH” position, flush water valve opens andflushes reservoir and evaporator.

21[g] When flush timer operates (for 21 min. every 12 hours), flush water valve opensand flushes reservoir and evaporator.

22[h] When 208-230V are supplied to circuit protect relay, it protects the circuit from beingmiswired. If the power supply is properly connected, the

23[i] When pressure switch opens, power supply to the control board is cut off causing thecompressor and gear motor to turn off immediately.

24[j] When input voltage is too low (less than 70%) gear motor fuse (1.5A) is blown causing compressor and gear motor to turn off immediately

25Miswiring. Circuit Protect Relay operates.Proper wiring. The unit starts.BIN CONTROLOFF ON1. CIRCUIT PROTECTRELAY2. WATER LEVEL3.

261. CIRCUIT PROTECTRELAY2. WATER LEVEL3. FLOATSWITCHUPPERLOWER4. WATER CONTROLRELAY5. CONTROL WATERVALVE6. FLUSH TIMER7. FLUSH SWITCH8. FLUSH

271. CIRCUIT PROTECTRELAY2. WATER LEVEL3. FLOATSWITCHUPPERLOWER4. WATER CONTROLRELAY5. CONTROL WATERVALVE6. FLUSH TIMER7. FLUSH SWITCH8. FLUSH

28APPROXIMATE AmbientICE PRODUCTION Temp. (°F)PER 24 HR. 70 484 220462 209 442 20180 424 192 406 184 389 17690 372 169 362 164 341 155lbs./day kg/d

29APPROXIMATE AmbientICE PRODUCTION Temp. (°F)PER 24 HR. 70 430 195410 185 395 18080 380 170 365 165 350 16090 135 150 325 150 310 140lbs./day kg/d

3CONTENTSI. Specifications ... 41. F-

30IV. Service Diagnosis1. No Ice ProductionPROBLEM POSSIBLE CAUSE REMEDY[1] The icemaker willnot start.a) Power Supply 1. OFF position. 1. Move to ON

31PROBLEM POSSIBLE CAUSE REMEDYc) Gear Motor Relay 1. Coil winding opened. 1. Replace.2. Bad contacts. 2. Check for continuityand replace.d) Control T

32PROBLEM POSSIBLE CAUSE REMEDY[7] Gear Motor andCompressor startbut no ice isproduced.a) Refrigerant Line 1. Gas leaks. 1. Check for leaks with aleak

332. Low Ice ProductionPROBLEM POSSIBLE CAUSE REMEDY[1] Low ice production a) Refrigerant Line 1. Gas leaks. 1. See "1. [5] a)Refrigerant Line.&q

343. OtherPROBLEM POSSIBLE CAUSE REMEDY[1] Abnormal noise a) Fan Motor 1. Bearing worn out. 1. Replace.2. Fan blade deformed. 2. Replace fan blade.3.

35IMPORTANT1. The Polyol Ester (POE) oils used in R-404A units can absorb moisturequickly. Therefore it is important to prevent moisture from entering

362. BrazingWARNING1. Refrigerant R-404A itself is not flammable at atmospheric pressure andtemperatures up to 176°F.2. Refrigerant R-404A itself is

373. Removal and Replacement of CompressorIMPORTANTAlways install a new drier every time the sealed refrigeration system isopened. Do not replace the

3813) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.14) Evacuate the system, and charge it with refrigerant. See the nameplate for th

391) Unplug the icemaker.2) Remove the panels.3) Recover the refrigerant and store it in an approved container, if required by anapplicable law.4) Rem

4AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120 V 8.5 RLA 51 LRAGEAR MOTOR 120 V 1.6 FLA 1/6 HPFAN MOTOR 115 V 0.85FLA 50WOTHER 120 V 0.03AMAXIMUM FUSE SIZ

406. Removal and Replacement of Evaporator Assembly1) Drain the water from the evaporator by switching the flush switch to “FLUSH” on thecontrol box.

4111) Remove the bulb of the expansion valve.12) Disconnect the brazing-connections of the expansion valve and the copper tube- low side from the evap

4223) When replacing the evaporator:(a) Braze the new evaporator with nitrogen gas flowing at the pressure of 3-4 PSIG.(b) Replace the drier.(c) Check

436) Remove the water supply hose from the control water valve.7) Install the new control water valve.8) Assemble the removed parts in the reverse ord

4414) Move the flush switch to the “ICE” position.15) Check for water leaks.16) Move the flush switch to the “FLUSH” position, and make sure water is

452. Cleaning and Sanitizing InstructionsWARNING1. HOSHIZAKI recommends cleaning this unit at least twice a year. Morefrequent cleaning, however, may

46[b] Cleaning ProcedureThe cleaning process will remove lime deposits from the water system.1) Remove the front panel and top panel, then turn off th

47[c] Sanitizing SolutionDilute 2.5 fl. oz. (74 ml or 5 tbs) of IMS-II Sanitizer or a 5.25% sodium hypochlorite solution(chlorine bleach) with 5 gallo

4814) Replace all parts in their correct positions.IMPORTANTWhen installing the baffles, make sure that the bent surface (the one without thestuds) fa

4916) When the gear motor starts, remove the front panel and turn off the power supply.17) Drain out all water from the water line. See 2) and 3).18)

5AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120 V 8.5 RLA 51 LRAGEAR MOTOR 120 V 1.6 FLA 1/6 HPFAN MOTOR 115 V 0.85FLA 50WOTHER 120 V 0.03AMAXIMUM FUSE SIZ

503. Maintenance InstructionsIMPORTANT1. This icemaker must be maintained individually, referring to the instruction manual and labels provided wi

513) Air FilterA plastic mesh air filter removes dirt or dust from the air, and keeps the condenserfrom getting clogged. As the filter gets clogged, t

6II. General Information1. ConstructionWater SupplyInletJunction BoxCondenserFan MotorCompressorDrierControl Water ValveBin ControlIce ChuteEvaporator

72. Control Box LayoutNote: The above component names are identical with the wiring label, but not withthe parts list.

83. Timer Board[a] Solid-State Control1) A HOSHIZAKI exclusive solid-state control is employed in the self-contained flakericemakers.2) A printed circ

9Fig. 1[c] SequenceFig. 2