Hoshizaki dcm-75ibah manual

Hoshizaki “A Superior Deg re e of Reliability” www .hoshizaki.com Models DCM-751BAH(-OS) DCM-751BWH(-OS) Cubelet Icemaker/Dispenser Hoshizaki America, Inc. SE RV ICE MA NU AL Number: 73184 Issued: 8-31-2012 Revised: 9-24-2014[...]

2 W ARNING Only quali ed ser vice technicians should inst all and ser vice the appliance. T o obtain the name and phone number of y our local Hoshizaki Cer ti ed Ser vice Repr esentativ e, visit www .hoshizaki.com. No ser vice should be under tak en until the technician has thor oughly r ead this Ser vice Manual. F ailure t o ser vice and mai[...]

3 IMPOR T ANT This manual should be r ead carefull y befor e the appliance is ser viced. Read the warnings and guidelines contained in this manual car efully as the y pro vide essential inf or mation f or the continued saf e use, service, and maintenance of the appliance. Ret ain this manual f or any fur ther ref erence that ma y be necessar y . CO[...]

4 B. Impor tant Not es f or Component R eplacement ............................................................ 42 C . Icemaking Unit ............................................................................................................ 44 1 . Upper Bear ing Wear Chec k .........................................................................[...]

5 Impor tant Safety Inf ormation Throughout this man ual, notices appear to bring y our at tention t o situations which could result in death, serious injur y , damage to the appliance , or damage to pr oper ty . W ARNING Indicates a hazar dous situation whic h could result in death or serious injury . NO TICE Indicates a sit uation which could res[...]

6 W ARNING, continued • Children should be pr oper l y super vised around the appliance . • Do not climb , stand, or hang on the appliance or allow childr en or animals to do so . Serious injur y could occur or the appliance could be damaged. • Do not use combustib le spra y or place v olatile or  ammable subst ances near the appliance. Th[...]

7 I. Construction and W ater/R efriger ation Circuit Dia grams A. Construction 1 . DCM-751B AH(-OS) Stor age Bin Inlet W ater V alv e Reservoir Contr ol Bo x Air -Cooled Condenser Spout Co ver Evapor ator Assemb ly Compr essor Dispensing Motor Agit ator (L) Dispense A uger Dispense W ater V alv e Spout B Float S witch Shut ter Assembl y P ower S wi[...]

8 2. DCM-751BWH(-OS) W ater -Cooled Condenser Stor age Bin Inlet W ater V alv e Reservoir Contr ol Bo x Spout Co ver Ev aporator Assemb ly Compr essor Dispensing Motor Agit ator (L) Dispense A uger Dispense W ater V alv e Spout B Float S witch Shut ter Assembl y P ower S witch Spout A Drain V alv e Ther mostatic Expansion V alve Saf et y S witch (D[...]

9 3. Ice Making Unit Cubelet Cut ter Allen Head C ap Scre w Gear Motor O-Ring Mechanical Seal Extruding Head and Upper Bearing He x Head Bolt with W ashe r A uger Ev aporator Housing and Low er Bear ing C ylinder Insulation Allen Head C ap Scre w with W asher W asher Extruding Head Heater[...]

10 Inlet W ater V alve Dispense W ater V alve Drain V alve Float Switch W ater Le vel T o Drain Evapor ator Spout Thermostatic Expansion V alv e Gear Motor Over ow Reservoir W ater Suppl y Drier Air -Cooled C ondenser Fa n High-P ressure S witch Compr essor Refrigeration Cir cuit W ater Cir cuit B. W ater/Refr ig er ation Cir cuit Diagr ams 1 . [...]

11 Inlet W ater V alve Dispense W ater V alve Drain V alve Float Switch W ater Le vel T o Drain Evapor ator Spout Thermostatic Expansion V alv e Gear Motor Over ow Reservoir W ater Suppl y Drier W ater -Cooled Condenser Compr essor W ater In W ater Out Refrigeration Cir cuit W ater Cir cuit W ater R egulating Va l v e High-P ressure S witch 2. D[...]

12 II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flo w Char t BC open (BC actuator paddle engaged) "F-A" Contr ol Board Sequence Flo w Char t DCM-751B_H(-OS) 1 -in-1 drain cycle . D V energizes f or 2 seconds ev er y hour (S1 Dip Switch 4). Does not af fect operation. GM energiz ed GMPR energiz ed 3. 1 -in-12 Dr[...]

13 B. Service Diagnosis W ARNING • The appliance should be diagnosed and repair ed only b y quali ed ser vice personnel t o reduce the risk of death, electr ic shoc k, serious injur y , or r e. • Risk of electric shock. Use extr eme caution and ex ercise saf e electr ical practices . • Moving par ts (e .g., f an blade) can crush and cut[...]

14 7) Startup–"PO WER OK" LED is on: Mov e the power s witch to the "ON" position, then mov e the control s witch to the "ICE" position. CB "POWER OK" LED is on. "PO WEROK" LED Diagnosis: Chec k that CB "PO WER" LED is on. If not, check f or proper po wer supply v oltage (1 1 5V AC[...]

15 9) Ice Pur g e Cy cle – "GM" LED is on. UFS closes (WV de-ener gizes) and "WTRIN" LED tur ns of f . 5-sec. GM delay timer and 30-min. FZT star t. 5-sec. GM delay timer terminates . GM and GMPR energize . 5-min. IPT star ts. GM runs for 5 min. to clear any ice fr om the ev aporator . Diagnosis : If "GM" LED is of f[...]

16 1 2) Drain Cy cle – "FLUSH" (dr ain) LED is on. IMPORT ANT ! Drain valv e will not energize unless the safety s witch is engaged. The appliance is f actory set to drain the e v aporat or and reservoir once e very hour for 2 seconds . A manual drain is pr ovided when cleaning the appliance by mo ving the control s witch from the "[...]

17 1 3) Shutdown –Bin lls and ice eng ages BC actuator paddle. 6 t o 1 0-sec. shutdown sequence begins. Diagnosis: Chec k that BC actuator paddle is activ ated and not sticking . Check BC pr oximity s witch continuity to conr m BC pr o ximity switch is open. If BC actuator is eng aged and BC pro ximit y s witch is closed, replace BC pr oxim[...]

18 C. Control Boar d Check Bef ore r eplacing a CB that does not show a visib le def ect and that you suspect is bad, alw ay s conduct the follo wing check pr ocedure. This procedur e will help you v erify your diagnosis. Bef ore pr oceeding, chec k f or proper v oltage per appliance nameplate . Check that the 24V A C 1A fuse and 1 1 5V AC 3A GM fu[...]

19 2) 5VDC Output Checks: There ar e se ven 5VDC cir cuits on the appliance, "DRAIN" position through contr ol switch, high-pr essure s witch (HPS), gear motor pr otect rela y(GMPR), bin control (BC),  oat s witch (FS), ice dispense s witch, and wat er dispense s witch. • 5VDC CB K9 Connector: See F ig. 1 . 5VDC CB K9 Connector Co[...]

20 c . Gear Mot or Pr otect Rela y (GMPR) CB K9 connector pins #5 (W/O) and #6(W/O): When GMPR is de-ener gized, GMPR terminals #3 and #5 are open and 5VDC is pr esent bet ween CBK9connector pin #5 (W/O) and CB r ed K4connector pin closest t o CBblac k K3 connector . If 5VDC is not present, r eplace CB. When GMPR is ener gized, GMPR [...]

21 • 5VDC CB K7 Connector: See Figs . 3, 4, 5, and 6. • W ater Dispense S witch/W ater Dispense Sensor f . P ush But ton Model–"WTRDP" LED is on: Bef ore eng aging the wat er dispense s witch, check f or the correct VDC from the locations giv en in the "Disengaged" column in the tab le below . If the VDC is dif fer ent tha[...]

22 Red positiv e test lead t o red K4 connector pin closest to b lack K3 connector F ig. 4 Red P ositive T est Lead Black Neg ative T est Lead Multimeter 5VDC Control Boar d K7 Connector W ater Dispense (W) (s witch signal) g . Opti-Serve Model–"WTRDP" LED is on: Befor e engaging the w ater dispense Opti-Ser v e sensor , check f or the [...]

23 • Ice Dispense S witch/Ice Dispense Sensor : h . P ush But ton Model – "ICE" and "AM" LEDs ar e on: Bef ore eng aging the ice dispense s witch, check f or the correct VDC from the locations giv en in the "Disengaged" column in the t able belo w . If the VDC is dif fer ent than in the table , replace CB . If the [...]

24 i . Opti-Serve Model–"ICE" and "AM" LEDs ar e on: Befor e engaging the ice dispense Opti-Ser v e sensor , check f or the correct VDC from the locations giv en in the "Disengaged" column in the t able belo w . If the VDC is dif fer ent than in the table , replace CB . If the VDC reading is corr ect, engage the Opti[...]

25 3) F ill Cyc le–"WTRIN" LED is on: "WTRIN" LED tur ns on only when the r eser voir w ater le v el is low enough t o open LFS. Diagnosis: C onr m LFS is open. If "WTRIN" LED is of f and LFS is open and the control s witch is in the "ICE" position (open), replace CB. If "WTRIN" LED is on and w[...]

26 D . Bin Contr ol Check When the actuat or paddle is not engaged, BC is closed and the appliance pr oduces ice. S1 dip s witch 7 must be in the "OFF" position. When ice lls the chut e and engages the actuator paddle , BC opens and CB shuts down the appliance within 1 0 seconds. NOTICE! Do not place S1 dip s witch 7 in the "ON&qu[...]

27 E. Float S witch Chec k and Cleaning 1 . Float Switc h Check 1) Remo ve the fr ont panel and mov e the control s witch to the "DRAIN" position. 2) P r ess and hold the saf et y s witch to star t draining the appliance . IMPOR T ANT!  Appliance will not star t unless the safety s witch is engaged. 3) Allow the w ater t o drain from t[...]

28 Red (R) (upper  oat switch) Black (BK) (common) Dark Blue (DBU) (lower  oat switch) Upper Float (blue) Magnet (to war ds top) Magnet (to war ds top) Low er Float (white) Plastic Ret ainer Clip Spring Retainer Clip Reservoir Reservoir C ov er Float Switch Assemb ly F ig. 7 F ig. 8[...]

29 F . Diagnostic T ables Bef ore consulting the diagnostic t ables , check f or correct installation, pr oper v oltage per appliance nameplate , and adequate wat er pressur e (1 0 to 1 1 3 PSIG). Check contr ol board using the st eps in "II.C. Contr ol Board Chec k." 1 . No Ice Pr oduction No Ice Pr oduction - Possib le Cause Startup 1. [...]

30 No Ice Pr oduction - Possib le Cause F reeze Cyc le 1. Contr ol Board a) Def ective . 2. Star t Rela y a) Defectiv e. 3. Star t Capacit or or Run C apacitor a) Def ective . 4. Compressor a) External prot ector . b) Motor winding . c) Mechanical f ailure . 5. High-P ressur e Switch A ctivat es a) Dir ty condenser . b) Ambient temper ature t oo wa[...]

31 2. Ice/W ater Dispensing Ice Dispense-Push But ton 1. P ower Suppl y a) Of f, b lown fuse, or tripped br eaker . 2. Control Boar d a) Ice dispense s witch circuit open or no pow er (5VDC) from contr ol board. b) No power (1 1 5V AC) t o ice dispense solenoid, ice dispense motor , or agitating mot or . 3. Ice Dispense Switch a) Def ective . 4. Di[...]

32 III. Controls and A djustments • A Hoshizaki e x clusive contr ol board is emplo yed in the DCM-751 series. • All models are pr etest ed and f actory set. • F or a control boar d check pr ocedure , see "II.C. Contr ol Board Chec k." NO TICE • F ragile, handle v er y carefull y . • The control boar d contains integ rat ed circ[...]

33 T ransf or mer Input #7 (W/R) A. Control Boar d L a yout 1 . DCM-751B_H Drain V alve #1 0 (W/BU) • K6 Connector Open • "SER VICE" Butt on (Ice Pur ge Cycle Bypass) T ransf or mer 24V AC Input #1 (W/R) Upper Float Switch #6 (R) Mechanical Bin Contr ol #3 to #4 (GY) Gear Motor P rot ect Relay Cir cuit #5 to #6 (W/O) Rela y De-Energiz[...]

34 Drain V alve #1 0 (W/BU) • K6 Connector Open • "SER VICE" Butt on (Ice Pur ge Cycle Bypass) T ransf or mer 24V AC Input #1 (W/R) Upper Float Switch #6 (R) Mechanical Bin Contr ol #3 to #4 (GY) Gear Motor P rot ect Relay Cir cuit #5 to #6 (W/O) Rela y De-Energized-Open-5VDC Rela y Energized-Closed-0VDC High-P ressure S witch #3 to #[...]

35 B. LED Lights and A udible Alarm Saf eties The "PO WER" LED indicates pr oper control v oltage and will remain on unless a contr ol v oltage pr oblem occur s. For fur ther details , see "II. Sequence of Operation and Ser vice Diagnosis." Icemaking Sequence Sequence Step LED Energized Components Min. Max. F ill Cy cle WTRIN WV[...]

36 C. Set tings and Adjustments NO TICE Dip s witches are f actory set. F ailure t o maintain f actory set tings may adv ersel y af fect perf or mance and warr ant y co ver age. F or more inf or mation, contact Hoshizaki T echnical Suppor t at 1 -800-233-1 940. 1 . Default Dip Switc h Set tings The S1 dip s witch set tings are f actor y -set to the[...]

37 4. Continuous Dispensing Timer (S1 dip switch 5 & 6) The dispense mode s witch must be in the "CONTINUOUS" position f or this set ting to apply . The fact or y set ting allows ice t o be dispensed continuousl y on push but ton models and f or a maximum of 60 sec. on Opti-Ser ve models . S1 Dip S witch Set ting Dispense Time No. 5 N[...]

38 D . P ow er Switc h, Control S witch, and Dispense Mode S witch The pow er s witch, control s witch, and dispense mode s witch are used t o control the operation of the appliance . 1 . P ower S witch W ARNING! The power s witch does not tur n of f all pow er supply t o the unit. 1 1 5V A Cpower suppl y is present on control boar d K1 connecto[...]

39 CONTROL DISPENSE MODE 4A1038-0 14 ICE OFF DRAIN PORTION CONTINUOUS 3. Dispense Mode Switc h The dispense mode s witch has 2 positions, "CONTINUOUS" and "POR TION." See F ig.1 2. a) CONTINUOUS When the dispense mode s witch is in the "CONTINUOUS" position, ice dispenses as f ollows: P ush But ton: Ice dispenses co[...]

40 IV . Remo v al and Replacement of Components W ARNING • The appliance should be diagnosed and repair ed only b y quali ed ser vice personnel t o reduce the risk of death, electr ic shoc k, serious injur y , or r e. • Mov e the control s witch and the power s witch to the "OFF" position and turn of f the pow er supply bef ore [...]

41 1 . Refr igerant R ecov er y The appliance is pro vided with refrigerant access v alv es. Using proper r efr igerant practices , reco v er the refrigerant fr om the access v alv es and stor e it in an appro ved container . Do not discharge the r efrigerant into the atmospher e. 2. Brazing W ARNING • R-404A itself is not  ammable at atmosphe[...]

42 5) Disconnect the gauge manif old hose from the v acuum pump and at tach it t o a refrigerant service cylinder . Remember t o loosen the connection and purge the air fr om the hose. See the nameplate inside the appliance f or the requir ed refrigerant charge . Hoshizaki recommends onl y virgin r efrigerant or reclaimed r efr igerant which meets [...]

43 Ev aporat or Assemb ly F ig. 1 4 Spout B Spout A P ower S witch Ev aporator Assemb ly Saf et y S witch CONTROL DISPENSE MODE 4A1038-0 14 ICE OFF DRAIN PORTION CONTINUOUS Extruding Head and Upper Bearing Ev aporator Allen Head C ap Scre w with W asher Allen Head C ap Scre w (with seal) Not reusab le Housing and Low er Bear ing Gear Motor Spline C[...]

44 C. Icemaking Unit 1 . Upper Bearing W ear Check T o ensur e that the bear ing inside the e xtr uding head does not e x ceed the wear t olerance of .02", f ollow the instructions below . See Fig . 1 5. 1) Mov e the control s witch to the "OFF" position, then turn off the po wer supply . R emov e the front and t op panels, then mov [...]

45 2. Remo val and R eplacement of Extruding Head 1) Mov e the control s witch to the "DRAIN" position and drain all of the w ater fr om the e v aporat or . 2) Af ter the w ater has st opped draining, mo ve the control s witch to the "OFF" position, then tur n of f the power suppl y . Remo v e the front and t op panels, then mov[...]

46 4. Remo val and R eplacement of Evapor ator NO TICE • Alw ay s install a ne w drier ev er y time the sealed refrigeration s yst em is opened. • Do not replace the drier until af ter all other r epair or replacement has been made. Install the ne w drier with the arrow on the drier in the dir ection of the refrigerant  o w. • When brazing[...]

47 1 6) Evacuat e the syst em, and charge it with r efrigerant. See the nameplat e f or the requir ed refrigerant char ge. 1 7) Install the new auger assemb ly with the upper par t of the mechanical seal at tached. Secure the auger assemb ly using ne w allen head cap scre ws. 1 8) Replace the e vaporat or brack et and reconnect the w ater hoses . 1[...]

48 1 3) Install the low er par t of the mechanical seal on the lower housing . 1 4) Lower the e vapor ator do wn and secure it t o the lower housing . 1 5) Install the auger assembl y with the upper par t of the mechanical seal at tached. Secure the auger assembl y using new allen head cap scr ews . 1 6) Replace the e vaporat or brack et in its cor[...]

49 D . Dispense Components 1 . Dispense A ug er and Agitat or 1) Mov e the control s witch to the "OFF" position, then turn off the po wer supply . R emov e the front and t op panels, then mov e the power s witch to the "OFF" position. 2) Remo ve the st orage bin co ver . 3) Remo ve the thumbscr ews fr om the ver tical plane, th[...]

50 V . Maintenance The maintenance schedule belo w is a guideline. More frequent maint enance may be requir ed depending on wat er qualit y , the appliance's envir onment, and local sanitation regulations . W ARNING • Only quali ed ser vice technicians should service the appliance. • Mov e the control s witch and power s witch to the &q[...]

51 VI. Pr eparing the Appliance for P eriods of Non-Use NO TICE When st or ing the appliance f or an ext ended time or in sub-freezing temper atures , f ollow the instructions below t o pre vent damage. When the appliance is not used f or t wo or three da ys under normal conditions, it is suf ficient t o only mo v e the control s witch to the "[...]

52 2. On wat er-cooled model onl y , remo ve the w ater from the w ater -cooled condenser: 1) Make sur e the control s witch and the power s witch are in the "OFF" position and that the pow er supply is of f . Remo ve the t op, apr on, and lef t side panels. 2) Close the condenser wat er supply line shut-of f val ve . If connect ed to a c[...]

53 VII. Disposal The appliance contains r efrigerant and must be disposed of in accor dance with applicable national, st ate , and local codes and regulations. Refrigerant m ust be reco ver ed by pr oper l y cer tied service personnel.[...]

54 Note: We r eser v e the right to mak e changes in specications and design without pr ior notice. AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOT OR 115 V 3.0 FLA 1/4 HP FAN MOT OR 115 V 1.0 FLA 50 W AGITAT ING MOT OR 120 V 1.8 FLA (T OTAL) 110 W (T OTAL) DISPENSING MOT OR 115 V 0.9 FLA 55 W OTHER 115 V 0.6 A MAXIMUM FUSE [...]

55 Note: We r eser v e the right to mak e changes in specications and design without pr ior notice. AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOT OR 115 V 3.0 FLA 1/4 HP FAN MOT OR 115 V 1.0 FLA 50 W AGITAT ING MOT OR 120 V 1.8 FLA (T OTAL) 110 W (T OTAL) DISPENSING MOT OR 115 V 0.9 FLA 55 W OTHER 115 V 0.6 A MAXIMUM FUSE [...]

56 Note: We r eser v e the right to mak e changes in specications and design without pr ior notice. AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOT OR 115 V 3.0 FLA 1/4 HP AGITAT ING MOT OR 120 V 1.8 F LA (TOT AL) 110 W (TO TAL) DISPENSING MOT OR 115 V 0.9 FLA 55 W OTHER 115 V 0.6 A MAXIMUM FUSE SIZE 20 A MAX. HACR BR EAKER [...]

57 Note: We r eser v e the right to mak e changes in specications and design without pr ior notice. AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOT OR 115 V 3.0 FLA 1/4 HP AGITAT ING MOT OR 120 V 1.8 FLA (T OTAL) 110 W (TO TAL) DISPENSING MOT OR 115 V 0.9 F LA 55 W OTHER 115 V 0.6 A MAXIMUM FUSE SIZE 20 A MAX. HACR BR EAKER [...]

58 Note: 1 . The data not in bold should be used for r efer ence only . 2. W e reserve the right to mak e changes in specications and design without pr ior notice. APPROXIM ATE Ambient ICE PRODUCTION T emp. (°F) PER 24 HR. 70 801 363 757 343 725 329 80 695 315 666 302 639 290 90 612 278 583 265 562 255 lb./day kg/day 100 539 245 517 234 490 222[...]

59 Note: 1 . The data not in bold should be used for r efer ence only . 2. W e reserve the right to mak e changes in specications and design without pr ior notice. APPROXIMATE Am bient ICE PRODUCTIO N Temp. (°F) PER 24 HR. 70 800 363 779 353 758 344 80 738 335 719 326 700 317 90 681 309 685 311 646 293 lb./day kg/day 100 629 285 612 278 563 255[...]

60 * * High P ressur e Switch Air -Cooled Model Wat er -Cooled Model Cut-out 41 2± 21 PSIG 384± 21 PSIG Cut-in 327±21 PSIG 284±21 PSIG 0 0 C. W iring Diagrams 1 . DCM-751B_H[...]

61 * * High P ressur e Switch Air -Cooled Model Wat er -Cooled Model Cut-out 41 2± 21 PSIG 384± 21 PSIG Cut-in 327±21 PSIG 284±21 PSIG 0 0 2. DCM-751B_H-OS[...]