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Hoshizaki DCM-271BAH, Service Manual

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Hoshizaki DCM-271BAH Service Manual Download Page 19

19

2. 

Opti-Serve Model

CB K8 connector pins #7 (R), #8 (P), and #9 (BK):

 

Before engaging the water 

dispense OS sensor, check for the correct VDC from the locations given in the 
"Disengaged" column in the table below. If the VDC is different than in the table, 
replace CB. If the VDC is correct, engage the OS sensor. "WTRDP" LED turns on. 
If not, confirm that the water dispense signal VDC matches the "Engaged" column 
in the table below. If not, replace the OS sensor. If the VDC matches the "Engaged" 
column below and the "WTRDP" LED does not turn on, replace CB. 

5VDC CB K7 Connector

Component

Pin # (Wire Color)

To CB VDC Ground

Disengaged Engaged

VDC Sensor Ground

#7 (R)

To

Red K4 pin #1 
(closest to CB 
black K3)

0VDC

0VDC

Water Dispense Signal

#8 (P)

0VDC

5VDC

5VDC Power Supply 

#9 (BK)

5VDC

5VDC

Fig. 4

Multimeter

5VDC

Control Board K7 Connector

Water Dispense (P)
(switch signal)

Water Dispense (R)
(VDC GND)

Water Dispense (BK)
(5VDC power)

Red test lead 
to CB red 
K4 pin #1 (pin 
closest to CB 
black K3)

Red Test Lead

Black Test Lead

Summary of Contents for DCM-271BAH

Page 1: ...Models DCM 271BAH OS Cubelet Icemaker Dispenser Service Manual Number 73242 Issued 12 15 2020 Revised 7 16 2021 hoshizakiamerica com ...

Page 2: ...lation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the appliance Should the reader have any questions or concerns which have not been satisfactorily addressed please call send an e mail message or write to the Hoshizaki Technical Support Department for assistance Phone 1 800 233 1940 770 487 2331 F...

Page 3: ... dip switch 5 6 36 5 Bin Control Selector S1 dip switch 7 36 6 Bin Control Shutdown Delay Agitation and Ice Purge Timer S1 dip switch 8 36 7 Bin Control Shutdown Delay S1 dip switch 9 37 8 Audible Alarm Silencer S1 Dip Switch 10 37 D Switches 37 IV Refrigeration Circuit and Component Service Information 38 A Refrigeration Circuit Service Information 38 B Component Service Information 41 C Icemakin...

Page 4: ...ate and local codes and regulations The appliance requires an independent power supply of proper capacity See the nameplate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuse damage to existing wiring or component failure This could lead to heat generation or fire THE APPLIANCE MUST BE GROUNDED The appliance is equ...

Page 5: ...spray or place volatile or flammable substances near the appliance They might catch fire Keep the area around the appliance clean Dirt dust or insects in the appliance could cause harm to individuals or damage to the appliance NOTICE Follow the water supply drain connection and maintenance instructions carefully to reduce the risk of costly water damage In areas where water damage is a concern ins...

Page 6: ...nt Panel Assembly DCM 271BAH OS Apron Panel Assembly Lorem ipsum Control Switch Gear Motor External Protector Control Board Control Transformer Fuse AGC 1A 250VAC Icemaking Unit Top Panel Shutter Assembly Bin Control Switch Inlet Water Valve Dispensing Water Valve Reservoir DCM 271BAH Drain Pan Assembly Bin Top Cover DCM 271BAH Front Panel Assembly DCM 271BAH Apron Panel DCM 271BAH Lower Dispense ...

Page 7: ...itch Water Level To Drain Evaporator Bin Thermostatic Expansion Valve Gear Motor Overflow Reservoir Water Supply Drier Air Cooled Condenser Fan High Pressure Switch Compressor Refrigeration Circuit Water Circuit DCM 271BAH OS To Drain Bin Drain Hose Evaporator Water Supply Hose Bin Top Cover Agitator ...

Page 8: ...r valve 4 1 in 12 Drain Cycle The factory default is 1 in 1 drain cycle IMPORTANT Do not adjust for 1 in 12 drain cycle sequence on this model Refill Maximum 90 seconds 90 sec FT exceeded 90 sec PT starts and 1 beep alarm sounds Low Water Safety Shutdown 90 sec PT terminates appliance shuts down and 1 beep alarm continues When UFS closes alarm resets and 2 Ice Purge Cycle starts 1 beep alarm conti...

Page 9: ...melted place the bin top cover in its original position Do not secure at this time Remove the control box cover then move the control switch to the ICE position and the power switch to the ON position Once the gear motor starts press the SERVICE button on the control board located in the control box WARNING Risk of electric shock Care should be taken not to touch live terminals Lift the bin top co...

Page 10: ...ical outlet Remove the front top and left side panels 2 Plug the power cord back into the electrical outlet then move the power switch to the ON position 3 Move the control switch to the DRAIN position CB POWER OK LED and FLUSH drain LED turns on Diagnosis POWER OK LED Check that CB POWER OK LED is on If not check for 115VAC at control transformer brown BR wire to neutral W If 115VAC is not presen...

Page 11: ...WTRIN LED turns off 30 min FZT and 5 sec GM delay timer start If UFS remains open longer than 90 sec after LFS opens FT exceeded and CB sounds a 1 beep alarm WV remains energized until UFS closes Alarm resets automatically when UFS closes Diagnosis If reservoir is empty and WTRIN LED is off confirm LFS status See II E 1 Float Switch Check If LFS is open and WTRIN LED is off replace CB If WTRIN LED...

Page 12: ...iagnosis GM If 115VAC is present at CB K1 3 P to neutral W check GM external protector If tripped reset If GM external protector is closed check GM internal protector windings If open allow time for GM to cool down and internal protector to reset If not replace GM Next check GM capacitor and GM coupling between auger and GM Diagnosis FM If FM does not start check that fan blades are not binding Ne...

Page 13: ... relay and capacitor 9 Refill Cycle Low Water Safety As ice is produced the water level in the reservoir drops UFS opens Nothing occurs at this time When LFS opens WV energizes 90 sec low water safety timer fill timer starts Comp GM CCR and FM continue When UFS closes WV de energizes 90 sec low water safety timer fill timer terminates and 30 min freeze timer resets If UFS remains open 90 sec after...

Page 14: ...the power supply then move the control switch to the DRAIN position Turn on the power supply DV energizes to drain the evaporator and reservoir DV de energizes when the control switch is moved to the ICE position Diagnosis DV If DV does not energize check for 24VAC at CB K2 10 W DBU to neutral LBU If 24VAC is not present check control switch continuity If open while in the DRAIN position replace c...

Page 15: ...ICE position then move power switch to ON position POWER OK LED turns on POWER LED remains on unless power supply is interrupted Diagnosis Check that POWER OK LED is on If not check for proper 115VAC supply voltage to CT main breaker or fuse power supply cord and power switch Next check for proper 24VAC output from CT Next check that 1A fuse is good Check for 24VAC from CB K8 connector pin 1 W R t...

Page 16: ...O and CB K9 connector pin 6 W O If 5VDC is not present check CCR continuity between terminals 3 and 5 If closed and CCR is de energized replace CCR Check for 5VDC at CB K9 pin 5 W O and CB red K4 pin 1 pin closest to CB black K3 If 5VDC is not present replace CB When CCR is energized CCR terminals 3 and 5 close and 0VDC is present between CB K9 pin 5 W O and pin 6 W O 5VDC is present between CB K9...

Page 17: ...pin 7 LFS BU 5VDC is present between CB K8 pin 5 common BK and CB red K4 pin 1 pin closest to CB black K3 at all times If 5VDC is not present replace CB For further float switch diagnostics see II E Float Switch Check and Cleaning 5VDC CB K8 Connector Component Pin Wire Color Bin Control BC 3 GY and 4 GY Float Switch FS Common 5 BK Common Upper Float Switch UFS 6 R Lower Float Switch LFS 7 BU Fig ...

Page 18: ...n in the table below If not check the water dispense switch continuity when engaged closed If the water dispense switch is open when engaged replace the water dispense switch If the VDC matches the Engaged column below and the WTRDP LED does not turn on replace CB 5VDC CB K7 Connector Component Pin Wire Color To CB VDC Ground Disengaged Engaged 5VDC Power Supply 3 W BK To Red K4 pin 1 closest to C...

Page 19: ...lumn in the table below If not replace the OS sensor If the VDC matches the Engaged column below and the WTRDP LED does not turn on replace CB 5VDC CB K7 Connector Component Pin Wire Color To CB VDC Ground Disengaged Engaged VDC Sensor Ground 7 R To Red K4 pin 1 closest to CB black K3 0VDC 0VDC Water Dispense Signal 8 P 0VDC 5VDC 5VDC Power Supply 9 BK 5VDC 5VDC Fig 4 Multimeter 5VDC Control Board...

Page 20: ...se switch continuity when engaged closed If the ice dispense switch is open when engaged replace If the VDC matches the Engaged column below and the ICE LED does not turn on replace CB 5VDC CB K7 Connector Component Pin Wire Color To CB VDC Ground Disengaged Engaged 5VDC Power Supply 3 W BK To Red K4 pin 1 closest to CB black K3 5VDC 5VDC Ice Dispense Signal 2 Y 0VDC 5VDC Fig 5 Multimeter 5VDC Con...

Page 21: ...in the table below If not replace the OS sensor If the VDC matches the Engaged column below and the ICE LED does not turn on replace CB 5VDC CB K7 Connector Component Pin Wire Color To CB VDC Ground Disengaged Engaged VDC Sensor Ground 1 W R To Red K4 pin 1 closest to CB black K3 0VDC 0VDC Ice Dispense Signal 2 Y 0VDC 5VDC 5VDC Power Supply 3 W BK 5VDC 5VDC Fig 6 Multimeter 5VDC Control Board K7 C...

Page 22: ...resent confirm 115VAC from CB K1 connector pin 2 BK to neutral W If 115VAC is present on CB K1 connector pin 2 BK but not on CB K1 connector pin 3 P replace CB Once GM energizes CCR energizes and PT 5 min starts 5 Freeze Cycle GM and COMP LED are on PT terminates or press the SERVICE button on CB after the GM LED turns on to bypass ice purge cycle WARNING Risk of electric shock Care should be take...

Page 23: ...cro switch If BC large balance plate is engaged and BC micro switch is open replace BC micro switch 8 Disengage BC large balance plate 9 Reconnect BC connector Remove the control box cover 10 Move the move the control switch to the ICE position then move the power switch to the ON position 11 Make sure the GM LED is on There is a delay of at least 5 seconds before the GM LED turns on after power u...

Page 24: ...nt panels in their correct positions 2 Float Switch Cleaning Depending on water conditions scale may build up on FS Scale on the switch can cause the floats to stick In this case FS should be cleaned and checked 1 Remove the front top and left side panels then move the control switch to the DRAIN position 2 After the water has drained from the reservoir move the control switch to the OFF position ...

Page 25: ...witch Black BK common Blue BU lower float switch Upper Float blue Magnet towards top Magnet towards top Lower Float white Plastic Retainer Clip Spring Retainer Clip Fig 7 Reservoir Reservoir Cover Float Switch Assembly Fig 8 ...

Page 26: ...d 6 1A 24VAC Fuse Control Box a Defective 7 Control Switch a In DRAIN position b Defective 8 Control Board See II C Control Board Check a In alarm See III B LED Lights and Audible Alarm Safeties b Defective 9 Bin Control a Tripped with bin filled with ice b Micro switch defective c Large balance plate does not move freely 10 High Pressure Switch a Control board in 3 or 4 beep alarm See III B LED L...

Page 27: ...e 2 Start Relay a Defective 3 Start Capacitor a Defective 4 Compressor a External protector b Motor winding c Mechanical failure 5 High Pressure Switch Activates a Dirty condenser b Ambient temperature too warm c Fan motor not operating d Refrigerant overcharged e Defective f Refrigerant lines or components restricted 6 Fan Motor a Capacitor defective b Motor winding c Bearing worn out or locked r...

Page 28: ...nse Push Button 1 Power Supply a Off blown fuse or tripped breaker 2 Control Board a No power from control board to dispense board 5VDC or not reading signal b No power to ice dispense solenoid or dispense relay 115VAC 3 Dispense Board a Defective 4 Gear Motor a Defective 5 Shutter Assembly a Defective Ice Dispense Opti Serve 1 Power Supply a Off blown fuse or tripped breaker 2 Control Board See I...

Page 29: ...r valve 24VAC 3 Dispense Board a Defective 4 Water Dispense Valve a Water supply turned off b Defective Water Dispense Opti Serve 1 Power Supply a Off blown fuse or tripped breaker 2 Control Board See II C Control Board Check a No power from control board to OS sensor 5VDC or not reading signal b No power to water dispense valve 24VAC 3 OS Sensor infrared a Defective 4 Water Dispense Valve a Water...

Page 30: ...control board contains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the icemaker before handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not misconnect terminals Do not short out power supply t...

Page 31: ...r Lower Ice Dispense Signal 2 Y Upper Water Ice Dispense Common 3 W BK Upper or Lower Water Dispense Signal 8 P 24VAC Input 5 W R 115VAC Input 3 BK Agitation GM 4 Y 115VAC Input 1 BK Dispense Water Valve 6 W O LED Legend COMP compressor FLUSH DRAIN drain valve GM gear motor ICE dispense motor WTRDP water dispense valve WTRIN inlet water valve DRAIN Compressor Relay 115VAC input BK 115VAC output R ...

Page 32: ...A9214 01 Water Display LEDs LED 1 LED 2 Ice Display LEDs LED 5 LED 6 Ice Dispense Switch Water Dispense Switch LED Power Red R Wire Water Dispense Signal Pink P Wire Common Black BK Wire Ice Dispense Signal Yellow Y Wire 5VDC Water Display LEDs LED 3 LED 4 Ice Display LEDs LED 7 LED 8 ...

Page 33: ...e 8 O Control Transformer Input 9 W R Control Transformer Input 7 W R 5VDC 115VAC 24VAC 5VDC 5VDC 115VAC 24VAC OS Water Dispense Common 9 BK Ice Dispense Common 3 W BK Water Dispense Signal 8 Y or P Ice Dispense Signal 2 Y OS Ice Sensor 1 W R OS Water Sensor 7 R 24VAC Input 5 W R 115VAC Input 3 BK Ice Dispense Solenoid 2 DBU 115VAC Input 1 BK Dispense Water Valve 6 W O LED Legend COMP compressor F...

Page 34: ...atic reset once water supply is restored and UFS closes 2 Control Switch In DRAIN position longer than 15 minutes Automatic reset once the control switch is moved to the ICE position 3 High Pressure Switch First and second activation in 1 hour Automatic reset once pressure drops below the high pressure threshold and the high pressure switch closes 4 High Pressure Switch Third activation in 1 hour ...

Page 35: ...del When dip switch 7 is off dip switch 1 2 and 3 are ignored Factory set DCM 271BAH OS does not use a bin control with an infrared sensor The appliance uses a bin control with a mechanical micro switch for ice level control 3 Drain Frequency Control S1 dip switch 4 The appliance is factory set for optimum performance with the 1 in 1 drain cycle S1 dip switch 4 in the OFF position This setting all...

Page 36: ...off position the gear motor delay after the upper float switch closes is 5 seconds WARNING Do not adjust S1 dip switch 7 out of the factory default position This dip switch must be left in the factory default position or the appliance will not operate correctly S1 Dip Switch Setting Bin Control Application Gear Motor Delay No 7 OFF Bin Control Mechanical 5 seconds ON Bin Control Infrared Sensor wi...

Page 37: ...le Alarm Silencer No 10 OFF Audible Alarm Sounds ON Audible Alarm Suppressed D Switches The power switch and control switch are used to control the operation of this icemaker 1 Power Switch The power switch has 2 positions OFF and ON 2 Control Switch The control switch is a double pole double throw switch with 3 positions ICE OFF and DRAIN a ICE When the control switch is in the ICE position Pole ...

Page 38: ...the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do not use R 404A as a mixture with pressurized air for leak testing NOTICE Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 minutes when replacing or servicing parts The Poly...

Page 39: ...with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 14...

Page 40: ...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 val...

Page 41: ...mponent Notes Compressor Install a new drier start capacitor and start relay Fan Motor Install a new capacitor Thermostatic Expansion Valves 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 Upper and Lower Bearing...

Page 42: ...Agitator Extruding Head Upper Bearing Evaporator Socket Head Cap Screw Seal Bolt Housing Lower Bearing Gear Motor Spline Coupling O Ring Mechanical Seal Auger Fig 8 Ring Socket Head Cap Screw Cover Drip Ring O Ring Storage Bin ...

Page 43: ...aring press adaptor If one is not available replace the whole extruding head and lower housing 4 Replace the drip ring cutter agitator and storage bin top cover in their correct positions 5 Replace the top and front panels in their correct positions On the push button model reconnect the push button switch wire connectors 6 Plug the appliance into the electrical outlet Move the power switch to the...

Page 44: ...ing it counter clockwise then lift the drip ring out of the storage bin 2 Remove the seal bolts then screw the cutter agitator back on and use it to lift the auger and extruding head out of the evaporator Remove the extruding head and upper part of the mechanical seal from the auger and place them on the new auger NOTICE To help prevent water leaks be careful not to damage the surfaces of the O ri...

Page 45: ...using the socket head cap screws 10 Remove the drier then place the new drier in position Connect the inlet and outlet tubing to the new evaporator 11 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 12 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then rais...

Page 46: ...heck indicates that it is out of tolerance replace both it and the bearing inside the lower housing Note Replacing the bearing requires a bearing press adaptor If one is not available replace the whole extruding head and lower housing 8 Place the O ring on to the new lower housing then mount the lower housing on the gear motor 9 Place the lower part of the mechanical seal on the lower housing 10 P...

Page 47: ...in its correct position and secure 6 Connect the gear motor wires 7 Lower the evaporator down and secure the lower housing to the gear motor 8 Replace the drip ring cutter agitator and storage bin top cover in their correct positions Confirm all water hose connections are secure 9 Move the control switch to the ICE position then replace the panels in their correct positions On the push button mode...

Page 48: ... and warm water Dilute 0 82 fl oz 25 ml of a 5 25 sodium hypochlorite solution chlorine bleach with 1 6 gal 6 0 l of warm water Slowly pour one cup of sanitizing solution into the evaporator condensate drain pan Be careful not to overflow the pan This solution will flow down to the gear motor drain pan and out the drain line to sanitize these areas Repeat with a cup of clean water to rinse Icemake...

Page 49: ...h a compressed air or carbon dioxide supply to the icemaker water supply line drain valve 5 While engaging the water dispense switch blow out the water dispense valve using the compressed air or carbon dioxide supply After blowing out the water dispense valve leave the compressed air or carbon dioxide supply flowing Move the control switch to the ICE position to open the inlet water valve and brie...

Page 50: ...posal This appliance contains refrigerant and must be disposed of in accordance with applicable national state and local codes and regulations Refrigerant must be recovered by properly certified service personnel ...

Page 51: ...ay 100 38 168 76 159 72 141 64 APPROXIMATE ELECTRIC 70 21 537 542 547 CONSUMPTION 80 26 552 557 561 90 32 566 571 582 watts 100 38 594 605 616 APPROXIMATE WATER 70 21 31 117 31 116 29 110 CONSUMPTION PER 24 HR 80 26 28 104 26 99 25 94 TOTAL 90 32 24 89 24 89 21 80 gal day l day 100 38 20 76 19 72 17 64 EVAPORATOR OUTLET TEMP 70 21 18 8 18 8 19 7 F C 80 26 19 7 19 7 20 7 90 32 20 7 20 6 22 5 100 38...

Page 52: ...16 APPROXIMATE WATER 70 21 31 117 31 115 29 110 CONSUMPTION PER 24 HR 80 26 27 104 26 99 25 94 TOTAL 90 32 23 89 23 88 21 80 gal day l day 100 38 20 76 19 72 17 64 EVAPORATOR OUTLET TEMP 70 21 18 8 18 8 19 7 F C 80 26 19 7 19 7 20 7 90 32 20 7 20 6 22 5 100 38 24 4 26 3 28 2 HEAD PRESSURE 70 21 233 16 4 243 17 1 254 17 8 80 26 264 18 5 274 19 3 284 20 0 90 32 295 20 7 305 21 4 310 21 8 PSIG kg cm2...

Page 53: ...53 B Wiring Diagram High Pressure Switch Cut out 412 22 PSIG Cut in 327 22 PSIG 0 ...

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