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Hoshizaki DCM 300BAH(-OS) Opti-Serve OS Sensors, 3a. Ice Dispense Continuous, 3c. Water Dispense

Models: DCM 300BAH(-OS)

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3. Opti-Serve (OS) Sensors

Be sure to check all items in section "IV.F.2. Ice/Water Dispense" prior to using this chart. Use the following charts along with the wiring diagram to troubleshoot the OS sensors.

	Ice Sensor
1. OS Sensor	a) Dirty.

	b) Defective. See chart 3a and 3b.

2. Control Board	a) No power to infrared sensor.

	b) Not reading infrared sensor signal.
	Water Sensor

1. OS Sensor	a) Dirty.

	b) Defective. See chart 3c.

2. Control Board	a) No power to infrared sensor.
	b) Not reading infrared sensor signal.

3a. Ice Dispense "Continuous"

	Component	Control Board	Sensor	To	Control Board /Other	Sensor	Engaged	Disengaged
	Solenoid	K2 Pin 6 (LBU wire)	-	To	Neutral/GND	-	120VAC	0VAC
	Sensor	K5 Pin 4 (W/0 wire)	(R wire)	To	K5 Pin 5 (Y wire)	(W wire)	5VDC	0VDC
	Sensor	K5 Pin 4 (W/0 wire)	(R wire)	To	K5 Pin 6 (W/BR wire)	(BK wire)	5VDC	5VDC
					K5 Pin 6 (W/BR wire)	(BK wire)	5VDC	5VDC

3b. Ice Dispense "Portion"

	Component	Control Board			Sensor	To	Control Board /Other	Sensor	Engaged	Disengaged

	Solenoid	K2	Pin 6	(LBU wire)	-	To	Neutral/GND	-	120VAC	0VAC
	Sensor	K5	Pin 1	(W/R wire)	(R wire)	To	K5 Pin 2 (W/BU wire)	(W wire)	5VDC	0VDC
	Sensor	K5	Pin 1	(W/R wire)	(R wire)	To	K5 Pin 3 (W/BK wire)	(BK wire)	5VDC	5VDC
							K5 Pin 3 (W/BK wire)	(BK wire)	5VDC	5VDC

3c. Water Dispense

	Component	Control Board	To	Control Board /Other	Engaged	Disengaged
	Solenoid	K2 Pin 8 (DBU wire)	To	K4 Pin 2 (LBU wire)	24VAC	0VAC
	Sensor	K5 Pin 7 (R wire)	To	K5 Pin 8 (W wire)	5VDC	0VDC
	Sensor	K5 Pin 7 (R wire)	To	K5 Pin 9 (BK wire)	5VDC	5VDC
				K5 Pin 9 (BK wire)	5VDC	5VDC

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Hoshizaki DCM 300BAH(-OS) Opti-Serve OS Sensors, 3a. Ice Dispense Continuous, 3b. Ice Dispense Portion, 3c. Water Dispense

Contents

HoshizakiHoshizaki America, Inc Phone 1-800-233-1940 770 Fax Complete and detailed explanation of the problem618 Highway 74 South Peachtree City, GA Attn Hoshizaki Technical Support DepartmentCONTENTS B. Diagnostic Procedure IV. Service DiagnosisE. Float Switch Check and Cleaning 1. Float Switch CheckIndicates a hazardous situation which could result in death or Important Safety Informationserious injury Indicates a situation which could result in damage to theDo not place objects on top of the icemaker 1. DCM-300BAH-OS I. Specifications A. Icemaker1. Icemaker II. General Information A. Construction2. Icemaking Unit 1. Sequence Cycles and Shutdown B. Sequence of Operationa Fill Cycle b Ice Purge CycleSequence Flow Chart DCM-PB and DCM-OS Control Board Sequence Flow Chart DCM-300BAH-OSC. Control Board 1. Control Board Layout DCM-PB Push Button Model Control Boarda DCM-300BAH Control Boardb DCM-300BAH-OS DCM-OS Opti-Serve Model Control BoardControl Board Part Number 2A2649-011. Power Switch D. Power Switch, Control Switch, and Dispense Mode Switch2. LED Lights and Components 3. Dispense Mode Switch 2. Control Switcha ICE b DRAINInlet Water Valve Water Supply Float Switch III. Technical Information A. Water Circuit and Refrigeration CircuitReservoir Overflow Fan Motor Condenser Access Valve Water Level Evaporator Gear Motor High-Pressure Switch1. DCM-300BAH B. Wiring DiagramsHigh-Pressure Switch 2. DCM-300BAH-OSCut-out 412± 21 0 PSIG1. DCM-300BAH-OS C. Performance DataB. Diagnostic Procedure IV. Service DiagnosisA. Ice Production Check Page Page check DV solenoid continuity Page 4 5VDC Output Checks C. Control Board CheckIce Dispense Controls b Opti-Serve Model - ICE and AM LEDs are on Water Dispense Switch/Water Dispense Sensor Page D. Bin Control Check 1. Float Switch Check E. Float Switch Check and Cleaning2. Float Switch Cleaning 1. No Ice Production F. Diagnostic ChartsShutdown Ice Purge CycleFreeze Cycle RefillIce Dispense Push Button 2. Ice/Water DispenseIce Dispense Opti-Serve Water Dispense Push Button3a. Ice Dispense Continuous 3. Opti-Serve OS Sensors3b. Ice Dispense Portion 3c. Water DispenseA. Service for Refrigerant Lines V. Removal and Replacement of Components2. Brazing 1. Refrigerant Recovery3. Evacuation and Recharge R-404A B. Important Notes for Component Replacement Evaporator Assembly 1. Upper Bearing Wear Check 2. Removal and Replacement of Extruding Head4. Removal and Replacement of Evaporator 3. Removal and Replacement of Auger3 Remove the apron panel, then remove the left side panel 4 Recover the refrigerant and store it in an approved container7 Remove the evaporator bracket and disconnect the water hoses 8 Disconnect the inlet and outlet tubing5b. Lower Housing 5. Removal and Replacement of Mechanical Seal and Lower Housing5a. Mechanical Seal 6. Removal and Replacement of Gear Motor 8. Dispense or Agitating Motor 7. Dispense Auger and AgitatorVI. Cleaning and Maintenance a Cleaning Solution A. Cleaning and Sanitizing Instructionsb Cleaning Procedure 1. Water Systemd Sanitizing Procedure - Following Cleaning Procedure c Sanitizing Solutionc Cleaning and Sanitizing Procedure b Sanitizing Solution2. Dispense Components a Cleaning SolutionWater Dispense Nozzle Ice Dispense Spout Spout Cover Maintenance Schedule B. MaintenanceFrequency AreaC. Preparing the Icemaker for Periods of Non-Use VII. Disposal