Hoshizaki DCM270BAHOS, DCM270BAH User Manual

Service Manual

Cubelet Icemaker/Dispenser

Models

DCM-270BAH(-OS)

F-A & F-C Control Boards

Number: 73202

hoshizakiamerica.com Issued: 5-6-2014

Revised: 5-10-2016

WARNING

Only qualified service technicians should install and service the icemaker. To obtain the name and phone number of your local Hoshizaki Certified Service

Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage. Proper installation is the responsibility of the installer. Product failure or property damage due to improper installation 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: [phone]

Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.

618 Highway 74 South

Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the following information:

•Model Number ________________________

•Serial Number ________________________

•Complete and detailed explanation of the problem.

2

IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this booklet for any further reference that may be necessary.
CONTENTS
Important Safety Information..................................................................................................	4
I. Construction and Water Refrigeration Circuit Diagrams......................................................	6
A. Construction...................................................................................................................	6
B. Water/Refrigeration Circuit Diagrams.............................................................................	7
II. Sequence of Operation and Service Diagnosis..................................................................	8
A. Sequence of Operation Flow Chart...............................................................................	8
B. Service Diagnosis..........................................................................................................	9
C. Control Board Check....................................................................................................	14
D. Bin Control Check........................................................................................................	23
E. Float Switch Check and Cleaning................................................................................	25
F. Diagnostic Tables..........................................................................................................	27
III. Controls and Adjustments................................................................................................	31
A. Control Board Layout...................................................................................................	32
B. LED Lights and Audible Alarm Safeties.......................................................................	34
C. Settings and Adjustments............................................................................................	35
1. Default Dip Switch Settings.....................................................................................	35
2. Bin Control Shutdown Delay (Infrared Sensor) (S1 dip switch 1, 2, 3)...................	35
3. Drain Frequency Control (S1 dip switch 4).............................................................	35
4. Continuous Dispensing Timer (S1 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) (F-C CB Only)................................	37
8. Factory Use (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. Icemaking Unit.............................................................................................................	43
V. Maintenance.....................................................................................................................	49
VI. Preparing the Appliance for Periods of Non-Use.............................................................	50
VII. Disposal.........................................................................................................................	51
VIII. Technical Information....................................................................................................	52
A. Specification and Performance Data Sheets...............................................................	52
1. DCM-270BAH.........................................................................................................	52
2. DCM-270BAH-OS..................................................................................................	53
B. Wiring Diagrams..........................................................................................................	54
1. DCM-270BAH(-OS): ..............................................................................................	54
Serial Number: C10508L to D00829A (except C17634M and C17641M)..............	54
2. DCM-270BAH(-OS): ..............................................................................................	55
Serial Number: C17634M, C17641M, and D-00998A and Later............................	55

3

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property.

WARNING	Indicates a hazardous situation which could result in death or
	serious injury.
NOTICE	Indicates a situation which could result in damage to the
	appliance or property.
IMPORTANT	Indicates important information about the use and care of the
	appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous.

The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage.

To reduce the risk of death, electric shock, serious injury, or fire, follow basic precautions including the following:

•Only qualified service technicians should install and service the appliance.

•The appliance must be installed in accordance with applicable national, state, 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 equipped with a

NEMA 5-15 three prong grounding plug to reduce the risk of potential shock hazards. It must be plugged into a properly grounded, independent 3-prong wall outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a qualified electrician replace it with a properly grounded, independent 3-prong wall outlet. Do not remove the ground prong from the power cord and do not use an adapter plug. Failure to properly ground the appliance could result in death or serious injury.

•Do not use an extension cord.

•To reduce the risk of electric shock, do not touch the control switch or plug with damp hands. Make sure the control switch is in the "OFF" position before plugging in or unplugging the appliance.

•Do not use an appliance with a damaged power cord. The power cord should not

be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could result in electric shock or fire. To unplug the appliance, be sure to pull the plug, not the cord, and do not jerk the cord.

4

WARNING, continued

•Do not make any alterations to the appliance. Alterations could result in electric shock, injury, fire, or damage to the appliance.

•Do not place fingers or any other objects into the ice discharge opening.

•The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

•Young children should be properly supervised around the appliance.

•Do not climb, stand, or hang on the appliance or appliance door or allow children or animals to do so. Serious injury could occur or the appliance could be damaged.

•Do not use combustible 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, install in a contained area with a floor drain.

•Install the appliance in a location that stays above freezing. Normal operating ambient temperature must be within 45°F to 100°F (7°C to 38°C).

•Do not leave the appliance on during extended periods of non-use, extended absences, or in sub-freezing temperatures. To properly prepare the appliance for these occasions, follow the instructions in "VI. Preparing the Appliance for Periods of Non Use."

•Do not place objects on top of the appliance.

•The storage bin is for ice use only. Do not store anything else in the storage bin.

5

I. Construction and Water Refrigeration Circuit Diagrams

A.Construction

1.DCM-270BAH(-OS)

			Top Panel
		Bin Top Cover	Bin Control Switch
			Compressor
		Ice Storage Bin
	DCM-270BAH-OS	Shutter	Inlet Water Valve
	Front Panel
		Assembly
		Power	Control Box B Right Side Panel
		Switch	Reservoir
			Condenser
			Control Box A
			Cover
	DCM-270BAH
	Front Panel

DCM-270BAH

Apron Panel

Icemaking Unit	Control Box A
Dispensing Water Valve	Air Filter
DCM-270BAH-OS	Right Side Louver
Apron Panel
	Control Transformer
Control Switch
Fuse	Control Board
(AGC-1A, 250VAC)
Gear Motor
External Protector

6

B. Water/Refrigeration Circuit Diagrams

DCM-270BAH(-OS)

		Bin Top Cover
			Bin
		Agitator
	Inlet Water Valve
Water	Reservoir
Supply
		Water Level
		Float
		Switch	Bin Drain
				Thermostatic
		Evaporator	Hose
	Overflow			Expansion Valve

Evaporator Water

Supply Hose

To Drain

Drain Valve

Gear Motor	To Drain

Dispense Water Valve

Drier

Fan

High-Pressure Switch

Air-Cooled Condenser

Compressor

Refrigeration Circuit

Water Circuit

7

8

"F-A" & "F-C" Control Board Sequence Flow Chart

.A

.II

DCM-270B_H(-OS)

Sequence

Sequence

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.

Low Water Safety

1. Fill Cycle

2. Ice Purge Cycle

3. Freeze Cycle

When UFS closes,

of

of

To bypass, press the

1-in-1 drain cycle. DV energizes for 2 seconds every hour

90 sec. FT exceeded

alarm resets and

"SERVICE" button after

Operation

Operation

1. Startup

GM starts.

(S1 Dip Switch 4).

Refill

1-beep alarm sounds

2. Ice Purge Cycle

Does not affect operation.

starts.

Power Switch "ON"

Maximum

90 sec. PT starts

Maximum

5 sec.

90 seconds

90 seconds

Control Switch in "ICE"

*1-min. or 5-min.

90 seconds

"POWER OK" LED on

FT

PT

terminates

When UFS closes

*"F-A" E-0 (G) and Earlier dip switch 8 on - 5 min.

exceeded

ChartFlow

Serviceand

1-beep alarm sounds 1-beep alarm continues

WV energized

LFS closed

GM energized

Comp energized

UFS open

LFS closed

FT starts (90 sec.)

UFS closed

FM energized

LFS open

UFS closed

PT starts

WV energized

FT terminates

GM energized

FT starts (90 sec.)

FT terminates

UFS open

GM de-energized

WV de-energized

WV energized

WV de-energized

Comp de-energized

If Fill > 90 sec. FT

Comp energized

Comp energized

FM de-energized

FM energized

FM energized

WV energized

1-beep alarm sounds

GM energized

GM energized

GM energized

WV energized

alarm resets and

*"F-A" E-0 (H) and Later and "F-C" dip switch 8 off - 1 min. and a 2-second periodic agitation was added to occur every 90 min.

Diagnosis

2. Ice Purge Cycle starts.

2. Bin Control

1. Bin Full

2. Icemaker Off

3. Icemaker Restart

Shutdown & Restart

6 to 10 sec.

Ice level lowered

to "2. Ice Purge Cycle" above if UFS closed.

A. "F-A" E-0 (G) and

BC open

Earlier Dip Switch

(BC large balance

to "1. Fill Cycle" above if UFS open.

8 "ON"

plate engaged)

All Components de-energized BC closed

Legend:

(BC large balance plate disengaged)

BC-bin control

Comp-compressor

DC-drain cycle

B. "F-A" E-0 (H) and Later

1. Bin Full

2. Ice Purge Cycle

3. Icemaker Off

4. Icemaker

DT-drain timer

DV-drain valve

Dip Switch 8 "OFF"

150-sec. Shutdown Sequence

Restart

FM-fan motor

90 sec.

60 sec.

to "2. Ice Purge Cycle" above if UFS closed.

C. "F-C" Dip Switch

BC open

FT-fill timer (low water safety)

"1. Fill Cycle" above if UFS open.

GM-gear motor

8 and 9 "OFF"

(BC large balance

LFS-lower float switch

plate engaged) BC open

GM energized

GM de-energized

BC closed

PT-purge timer

Comp energized

Comp de-energized

UFS-upper float switch

FM energized

FM de-energized

WV-inlet water valve

GM energized

B. Service Diagnosis

WARNING

•The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.

•Risk of electric shock. Use extreme caution and exercise safe electrical practices.

•Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

•CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the appliance is serviced. Make sure that none have fallen into the storage bin.

•Make sure all food zones in the appliance are clean after service. For cleaning procedures, see the instruction manual or the maintenance label.

1.Ice Production Check

To check ice production, remove the front, top, and left side panels. Place a container under the spout and dispense all ice from the icemaker. Note: The ice dispense switch times out after 20 sec. Re-engage every 20 sec. until bin is empty. Move the control switch and power switch to the "OFF" position. Remove the bin top cover. Pour warm water over the remaining ice. After the ice is removed/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 cover and monitor the evaporator extruding head.

WARNING! Keep hands, hair, and loose clothing clear of the agitator rotating inside of the ice storage bin. Once ice begins to fill the bin, start a 10 min. timer. After 10 min., move the power switch to the "OFF" position. Place an empty container under the spout and dispense all ice from the icemaker. Note: The ice dispense switch times out after 20 sec. Re-engage every 20 sec. until bin is empty. Move the power switch to the "OFF" position. Weigh the ice to establish the batch weight (minus the weight of the container). Multiply the batch weight by 144 for the total production in 24 hr. Replace the control box cover and bin top cover in their correct positions and secure. Replace all panels in their correct positions and secure. Move the power switch to the "ON" position to start the automatic icemaking process.

9

2. Diagnostic Procedure

The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, adequate water pressure (10 to 113 PSIG), and proper voltage per unit nameplate.

Note: • When checking high voltage (115VAC), always choose a neutral (W) wire to establish a good neutral connection.

•When checking low voltage (24VAC), always choose a neutral (LBU) wire.

•When checking control board DC voltage (5VDC), always place the red positive test lead from the multimeter to CB K5 pin closest to CB K4 connector.

See "II.C. Control Board Check."

•To speed up the diagnostic process, the ice purge cycle may be bypassed by pressing the "SERVICE" button on the control board after the gear motor starts.

WARNING! Risk of electric shock. Care should be taken not to touch live terminals.

1)Move the power switch to the "OFF" position, then disconnect the power cord from the electrical outlet. Remove the front, top, and left side panels. Remove the control box cover.

2)Reconnect the power cord 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 present, check the power switch, power cord connection, and breaker. If 115VAC is present, check control transformer continuity. Replace as needed. Next, check for 24VAC at control transformer red (R) wire to neutral (LBU). If 24VAC is not present, check control transformer continuity. Replace as needed. If 24VAC is present, check 24VAC 1A fuse. If fuse is good, check for 24VAC at CB K8 #1 (W/R) to CB K8 #2 (LBU).

If 24VAC is present and "POWER OK" LED is off, replace CB.

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 control switch. If closed, check for 0VDC at control board K9 #1 (W/BK) to K9 #2 (W/BK). If 5VDC is present and control switch is closed, replace CB. If 24VAC is present, check for restricted DV and DV solenoid continuity. Clean or replace as needed.

3) After all of the water has drained, move control switch to the "ICE" position.

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4)Fill Cycle – "WTRIN" LED is on. WV energizes. The 90-sec. low water safety timer begins. LFS closes. Nothing occurs at this time. The reservoir continues to fill until

UFS closes, terminating the 90 sec. low water safety timer, starting the 30 min. freeze timer, and de-energizing WV. Diagnosis: Check that "WTRIN" LED turns on and water fills the reservoir. If not, check for water supply line shut off valve closed, restricted water filters, and restricted WV screen. Next, check for 24VAC at CB K2 #8 (O) to neutral (LBU). If 24VAC is not present, replace CB. If 24VAC is present, turn off the power switch, disconnect the WV wires and check WV solenoid continuity. If open, replace WV. Reconnect WV wires, move the power switch to the "ON" position, then check that DV is not leaking by. Check that WV shuts off when UFS closes.

Note: Low Water Safety– If UFS remains open 90 sec. after WV energizes, a 1 beep alarm sounds. This alarm resets automatically once UFS closes.

5)Ice Purge Cycle – "GM" LED is on. 5-sec. GM delay timer and 30 min. freeze timer start. WV de-energizes and "WTRIN" LED turns off. Once the 5 sec. GM delay timer terminates, GM and CCR energize. CCR cannot energize unless GM circuit is complete

(GM external protector and GM internal protector). Once CCR energizes, CB K9

#5 W/O and CB K9 #6 W/O 5VDC circuit closes and ice purge timer starts (1 min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier dip switch 8 on). See "II.C.3)c. Compressor Control Relay (Ice Purge Timer

Circuit)." If CCR de energizes, CB K9 #5 W/O and CB K9 #6 W/O circuit opens and an 8-beep alarm occurs. See "III.B. LED Lights and Alarm Safeties." Note: To bypass ice purge cycle and go straight to freeze cycle, press the "SERVICE" button on CB during the 5-sec. GM delay time.

Diagnosis CB: Check that UFS closed, WV LED turned off and WV de energized.

If UFS is closed, "WV" LED is off, and "GM" LED is off, replace CB. If "GM" LED is on and GM is off, confirm 115VAC at CB K1 #2 (BR) to neutral (W). If 115VAC is not

present, check for loose connection from power switch. If 115VAC is present, check for 115VAC at CB K1 #3 (BK) to neutral (W). If 115VAC is not present, replace CB. Diagnosis GM: If 115VAC is present at CB K1 #3 (BK) to neutral (W), check GM fuse,

GM capacitor, GM windings, and GM coupling between auger and GM.

Diagnosis CCR: See "II.C.3)c. Compressor Control Relay (Ice Purge Timer Circuit)."

Once ice purge timer terminates (1 min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier dip switch 8 on) or the "SERVICE" button is pressed, freeze cycle begins.

11

6) Freeze Cycle – "COMP" LED is on. ice purge timer terminates (1 min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier

dip switch 8 on) or the "SERVICE" button is pressed. "COMP" LED turns on. "GM" LED remains on. Comp and FM energize. GM and CCR continue. Ice production begins

4 to 6 minutes after Comp energizes depending on ambient and water conditions. Diagnosis Comp: Check that "COMP" LED is on and that Comp energizes. If "COMP" LED is off, confirm ice purge timer has terminated (1 min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier a dip switch 8 on).

Check for 0VDC across CB K9 #3 (W/O) and CB K9 #5 (W/O). If 5VDC is present, CCR contacts are open. Check for 115VAC at CCR #7 (R) to CCR #8 (W). If 115VAC is present, check CCR continuity between CCR #3 (W/O) and CCR #5 (W/O). If open, replace CCR. If closed and "COMP" LED remains off, replace CB. If "COMP" LED is on and Comp is off, check for 115VAC at CB X1 brown (BR) wire to neutral (W) and CB

X1 red (R) wire to neutral (W). If 115VAC is present on CB X1 brown (BR) wire and not on CB X1 red (R) wire, replace CB. If 115VAC is present on CB X1 red (R) wire, check Comp external protector, motor windings, start relay, and capacitors.

Note: If CCR de energizes, CB K9 #5 W/O and CB K9 #6 W/O circuit opens, Comp de energizes and an 8-beep alarm occurs. See "III.B. LED Lights and Alarm Safeties." Diagnosis FM: If FM does not energize, check FM capacitor, motor windings, and bearings.

7)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 WV energizes (fill timer exceeded), a 90-sec. shutdown cycle starts. Comp and FM de energize and CB signals a 1-beep alarm every 5 sec. 90-sec. ice purge timer starts. GM and CCR continue to clear ice from the evaporator. 90-sec. ice purge timer

terminates, GM and CCR de energize. WV and 1-beep alarm continue until UFS closes.

Diagnosis – Check that "WTRIN" LED is on. If not, check LFS. See "II.E. Float Switch Check and Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN"

LED is on, check that the reservoir fills. If not, check the water supply line, restricted water filters, WV solenoid, restricted WV screen. If WV is energized and refill exceeds

90-sec. low water safety timer (fill timer), check DV leaking by or open UFS. See "II.E. Float Switch Check and Cleaning."

Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer resets when UFS closes again. If UFS does not close again within 30 min., CB shuts down the icemaker and sounds a 5-beep alarm every 5 sec. See "II.B. LED

Lights and Alarm Safeties."

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10)Shutdown

a)"F-A" E-0 (H) and Earlier Dip Switch 8 "ON" CB Shutdown – Bin fills with ice activating BC micro-switch. Within 6 to 10 sec. CB shutsdown appliance.

b)"F-A" E-0 (H) and Later Dip Switch 8 "OFF" Shutdown – Bin fills with ice activating BC micro-switch. CB starts 90 sec. Comp shutdown timer. Once 90 sec. Comp shutdown timer terminates, Comp and FM de energize and 60 sec. GM shutdown timer starts. Once 60-sec. GM shutdown timer terminates, GM de energizes and icemaker is off.

c)"F-C" Dip Switch 8 and 9 "OFF" CB – Bin fills with ice activating BC micro-switch.

CB starts 90 sec. Comp shutdown timer. Once 90-sec. Comp shutdown timer terminates, Comp and FM de energize and 60 sec. GM shutdown timer starts. Once 60-sec. GM shutdown timer terminates, GM de energizes and icemaker is off.

Shutdown Diagnosis: Check that BC large balance plate is activated and not sticking. Check BC micro-switch continuity. When BC large balance plate is down

(icemaking), BC micro-switch is closed. When BC large balance plate is up BC micro-switch is open. If not, replace BC micro-switch. If BC micro-switch is open and Comp, FM, and GM do not de energize, replace CB. See "II.C. Control Board Check

Procedure."

Legend: BC–bin control; CB–control board; CCR–compressor control relay; Comp–compressor; CT–control transformer; DV–drain valve; FM–fan motor; GM–gear motor; LFS–lower float switch; UFS–upper float switch; WV–inlet water valve

13

C. Control Board Check

Before replacing a CB that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Before proceeding, check for proper voltage per appliance nameplate. Check that the 24VAC 1A fuse is good and 115VAC 3A GM external protector is closed.

NOTICE! Control Board Change:

•"F-A" control board 2A4296-01 no longer available.

•"F-C" control board 2A8054-01 new and replaces 2A4296-01.

•Check the S1 dip switch settings to assure that they are in the factory default position. For factory default settings, see "III.C.1. Default Dip Switch Settings." S1 dip switch

7 determines bin control application. WARNING! Do not adjust S1 dip switch 4, 7, 8, or 9 dip switches out of their factory default positions. These dip switches must be left in the factory default position or the appliance will not operate correctly.

•When checking for 115VAC high voltage (primary), always choose a 115VAC

neutral (W) to establish a good neutral connection.

• When checking for 24VAC low-voltage (secondary), always choose a 24VAC

neutral (LBU) to establish a good neutral connection. If the appliance is in alarm, see "III.B. LED Lights and Audible Alarm Safeties."

•When checking for 5VDC, use CB red K4 connector pin closest to CB black K3 connector for DC ground (GND).

14

1)Startup-"POWER OK" LED on: Move control switch to "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 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) to CB K8 connector pin #2 (LBU). If 24VAC is present and "POWER OK" LED is off, replace CB.

2)5VDC Output Checks: There are seven 5VDC circuits on the appliance.

a)3 circuits at CB K9 connector: Control switch "DRAIN" position, high-pressure switch

(HPS), and compressor control relay (CCR).

b)2 circuits at CB K8 connector: Bin control (BC) and float switch (FS upper and lower).

c)2 circuits at CB K7 connector: Ice dispense (push button, and OS sensor), and water dispense (push button and OS sensor).

2a) 5VDC CB K9 Connector: See Fig. 1.

5VDC CB K9 Connector

Component	Pin # (Wire Color)
Control Switch "DRAIN" Position	#1 (W/BK) and #2 (W/BK)
High-Pressure Switch (HPS)	#3 (Y) and #4 (Y)
Compressor Control Relay (CCR)	#5 (W/O) and #6 (W/O)
(CCR relay terminals #3 W/O and #5 W/O)

Red positive test lead to

red K4 connector pin closest to black K3 connector

Red Positive

Test Lead

Multimeter

5VDC

Black Negative

Test Lead

"DRAIN" Position on Control Switch (W/BK)

High-Pressure Switch (HPS) (Y)

Compressor Control Relay (CCR) CCR Terminals #3 (W/O) and #5 (W/O)

Control Board K9 Connector

Fig. 1

15

2a) 5VDC CB K9 Connector Continued:

a) Control Switch"DRAIN" Position

CB K9 connector pins #1 (W/BK) and #2 (W/BK):

•"ICE" Position: When the control switch is in the "ICE" position, CB K9 connector pin #1 and pin #2 are open. 5VDC is present between CB K9 connector

pin #1 (W/BK) and pin #2 (W/BK). If not, check control switch position and continuity (open). Replace as needed. Next, confirm 5VDC between pin

#1 (W/BK) and CB red K4 connector, pin closest to CB black K3 connector. If 5VDC is not present, replace CB.

•"DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 connector pin #1 (W/BK) and pin #2 (W/BK) are closed. 0VDC is present between pin

#1 (W/BK) and pin #2 (W/BK). If not, check control switch position and continuity.

Next, confirm 5VDC is present between both CB K9 connector pin #1 (W/BK) and pin #2 to CB red K4 connector, pin closest to CB black K3 connector. If 5VDC is not present on both pins, replace CB.

b)High-Pressure Switch (HPS)

CB K9 connector pins #3 (Y) and #4 (Y): When HPS is closed, 5VDC is present between both CB K9 connector pins #3 (Y) and pin #4 (Y) to CB red K4 connector pin closest to CB black K3 connector. If 5VDC is not present on pin #3 (Y) or pin

#4 (Y), replace CB. If 5VDC is present on CB K9 connector pin #3 (Y) and not on CB

K9 connector pin #4 (Y), HPS is most likely open. CB sounds a 3-beep alarm. Check HPS continuity. If HPS is open and CB is not in alarm, replace CB.

c)Compressor Control Relay (CCR)

CB K9 connector pins #5 (W/O) and #6 (W/O): When CCR is de energized (GM off), CCR terminals #3 and #5 are open and 5VDC is present between CB K9 connector pin #5 (W/O) and CB K9 connector pin #6 (W/O). If 5VDC is not present, check CCR continuity between terminals #3 and #5. If open, replace CB. When CCR is energized,

CCR terminals #3 and #5 close and 0VDC is present between CB K9 connector pin #5 (W/O) and pin #6 (W/O). 5VDC is present between CB K9 connector pin #5 (W/O) to CB red K4 connector pin closest to CB black K3 connector and CB K9 connector pin #6 (W/O) to CB red K4 connector pin closest to CB black K3 connector. If GM is energized and CCR terminals #3 & #5 are open, an 8-beep alarm occurs. See "III.B. LED Lights and Audible Alarm Safeties." If CCR terminals #3 and #5 are closed and 0VDC is present between CB K9 connector pin #5 (W/O) and pin #6 (W/O), Comp delay timer starts. If Comp does not energize after Comp delay timer terminates (1 min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB

E-0 (G) and earlier dip switch 8 on), replace CB.

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2b) 5VDC CB K8 Connector: See Fig. 2.

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)

Red positive
test lead to red
K4 connector
pin closest
to black K3	Red Positive
connector	Test Lead

Multimeter

5VDC

Black Negative

Test Lead

Control Board K8 Connector

Lower Float Switch (LFS) (BU)	Bin Control (GY)
	Float Switch (FS) Common (BK)
Upper Float Switch (UFS) (R)
	Fig. 2

2b) 5VDC CB K8 Connector Continued:

a) Bin Control (BC)

CB K8 connector pins #3 (GY) and #4 (GY): When BC is closed (icemaking), 5VDC is present between CB K8 connector pin #3 (GY) and pin #4 (GY) to CB red K4 connector pin closest to CB black K3 connector. If 5VDC is not present on either pin, replace CB. If 5VDC is present on pin #3 (GY) and not on pin #4 (GY), BC is open. See "II.D. Bin Control Check."

b) Float Switch (FS): Upper (UFS) and Lower (LFS):

CB K8 connector pins #5 common (BK), #6 UFS (R), and #7 LFS (BU): 5VDC is present between CB K8 connector pin #5 common (BK) and CB red K4 connector pin closest to CB black K3 connector at all times. If 5VDC is not present, replace CB. For further float switch diagnostics, see "II.E. Float Switch Check and Cleaning."

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