Hoshizaki Ice Maker dcm 75ibah User Manual

Hoshizaki America, Inc.

Hoshizaki

Cubelet Icemaker/Dispenser

Models

DCM-751BAH(-OS)

DCM-751BWH(-OS)

SERVICE MANUAL

“A Superior Degree

of Reliability”

www.hoshizaki.com

Number: 73184

Issued: 8-31-2012

Revised: 9-24-2014

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IMPORTANT

This manual should be read carefully before the appliance is serviced. Read

the warnings and guidelines contained in this manual carefully as they provide

essential information for the continued safe use, service, and maintenance of the

appliance. Retain this manual for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 5

I. Construction and Water/Refrigeration Circuit Diagrams ..................................................... 7

A. Construction.................................................................................................................. 7

1. DCM-751BAH(-OS).................................................................................................. 7

2. DCM-751BWH(-OS)................................................................................................ 8

3. Ice Making Unit........................................................................................................ 9

B. Water/Refrigeration Circuit Diagrams.......................................................................... 10

1. DCM-751BAH(-OS)................................................................................................ 10

2. DCM-751BWH(-OS) ..............................................................................................11

II. Sequence of Operation and Service Diagnosis............................................................... 12

A. Sequence of Operation Flow Chart............................................................................. 12

B. Service Diagnosis ....................................................................................................... 13

C. Control Board Check................................................................................................... 18

D. Bin Control Check ....................................................................................................... 26

E. Float Switch Check and Cleaning ............................................................................... 27

F. Diagnostic Tables......................................................................................................... 29

1. No Ice Production................................................................................................... 29

2. Ice/Water Dispensing............................................................................................. 31

III. Controls and Adjustments............................................................................................... 32

A. Control Board Layout .................................................................................................. 33

1. DCM-751B_H......................................................................................................... 33

2. DCM-751B_H-OS.................................................................................................. 34

B. LED Lights and Audible Alarm Safeties....................................................................... 35

C. Settings and Adjustments............................................................................................ 36

1. Default Dip Switch Settings.................................................................................... 36

2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3) ....................................... 36

3. Drain Frequency Control (S1 dip switch 4) ............................................................ 36

4. Continuous Dispensing Timer (S1 dip switch 5 & 6).............................................. 37

5. Bin Control Selector (S1 dip switch 7) ................................................................... 37

6. Bin Control Shutdown Delay (S1 dip switch 8) ...................................................... 37

7. Factory Use (S1 Dip Switch 9 & 10)....................................................................... 37

D. Power Switch, Control Switch, and Dispense Mode Switch ....................................... 38

IV. Removal and Replacement of Components ................................................................... 40

A. Service for Refrigerant Lines....................................................................................... 40

1. Refrigerant Recovery ............................................................................................. 41

2. Brazing .................................................................................................................. 41

3. Evacuation and Recharge (R-404A)...................................................................... 41

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B. Important Notes for Component Replacement............................................................ 42

C. Icemaking Unit ............................................................................................................ 44

1. Upper Bearing Wear Check .................................................................................. 44

2. Removal and Replacement of Extruding Head...................................................... 45

3. Removal and Replacement of Auger ..................................................................... 45

4. Removal and Replacement of Evaporator............................................................. 46

5. Removal and Replacement of Mechanical Seal and Lower Housing ................... 47

6. Removal and Replacement of Gear Motor ............................................................ 48

D. Dispense Components................................................................................................ 49

1. Dispense Auger and Agitator.................................................................................. 49

2. Dispense and Agitating Motors.............................................................................. 49

V. Maintenance .................................................................................................................... 50

VI. Preparing the Appliance for Periods of Non-Use............................................................ 51

VII. Disposal......................................................................................................................... 53

VIII. Technical Information.................................................................................................... 54

A. Speciﬁcation Sheets.................................................................................................... 54

1. DCM-751BAH ....................................................................................................... 54

2. DCM-751BAH-OS ................................................................................................. 55

3. DCM-751BWH....................................................................................................... 56

4. DCM-751BWH-OS ................................................................................................ 57

B. Performance Data ....................................................................................................... 58

1. DCM-751BAH(-OS)................................................................................................ 58

2. DCM-751BWH(-OS).............................................................................................. 59

C. Wiring Diagrams.......................................................................................................... 60

1. DCM-751B_H......................................................................................................... 60

2. DCM-751B_H-OS.................................................................................................. 61

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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

NOTICE

IMPORTANT

Indicates a hazardous situation which could result in death or

serious injury.

Indicates a situation which could result in damage to the

appliance or property.

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

• Electrical connection must be hard-wired and must meet national, state, and local

electrical code requirements. Failure to meet these code requirements could result

in death, electric shock, serious injury, ﬁre, or damage to equipment.

• 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. Failure to properly ground the appliance

could result in death, serious injury, or damage to equipment.

• To reduce the risk of electric shock, do not touch the power switch or control switch

with damp hands.

• Before servicing, move the power switch and control switch to the "OFF" position,

then turn off the power supply. Lockout/Tagout to prevent the power supply from

being turned back on inadvertently.

• 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.

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WARNING, continued

• Children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance 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 instructions in this manual 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 "V.D. Preparing the Appliance for Periods

of Non-Use."

• Keep ventilation openings, in the appliance enclosure or in the built-in structure,

clear of obstruction.

• 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.

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I. Construction and Water/Refrigeration Circuit Diagrams

A. Construction

Spout B

Storage Bin

1. DCM-751BAH(-OS)

Bin Control Switch

Control Box

Agitator (L)

Agitator (R)

Power Switch

Dispense Auger

Agitating Motor (L)

Agitating Motor (R)

4A1038-014

CONTROL

ICE

OFF

DISPENSE MODE

PORTION

Dispensing Motor

DRAIN

CONTINUOUS

Compressor

Spout A

Inlet Water Valve

Float Switch

Evaporator Assembly

Reservoir

Thermostatic Expansion Valve

Gear Motor

Dispense Water Valve

Shutter Assembly

Air-Cooled Condenser

Drain Valve

Spout Cover

Safety Switch (Door)

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2. DCM-751BWH(-OS)

Spout B

Storage Bin

Bin Control Switch

Control Box

Agitator (L)

Agitator (R)

Power Switch

Dispense Auger

Agitating Motor (L)

Agitating Motor (R)

4A1038-014

CONTROL

ICE

OFF

DISPENSE MODE

PORTION

Dispensing Motor

DRAIN

CONTINUOUS

Compressor

Spout A

Inlet Water Valve

Float Switch

Evaporator Assembly

Reservoir

Thermostatic

Expansion Valve

Dispense Water Valve

Shutter Assembly

Gear Motor

Water Regulating Valve

Water-Cooled Condenser

Spout Cover

Drain Valve

Safety Switch (Door)

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3. Ice Making Unit

Cubelet Cutter

Extruding Head

and Upper Bearing

Allen Head Cap Screw

Washer

Extruding Head Heater

Auger

Cylinder

Evaporator

Insulation

Allen Head Cap Screw

with Washer

Mechanical Seal

O-Ring

Housing and

Lower Bearing

Hex Head Bolt

with Washer

Gear Motor

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B. Water/Refrigeration Circuit Diagrams

1. DCM-751BAH(-OS)

Spout

Inlet Water Valve

Water Supply

Float

Switch

Water Level

Reservoir

Overﬂow

Evaporator

Drier

Thermostatic

Expansion Valve

To Drain

Drain Valve

Gear Motor

Dispense Water Valve

Fan

Air-Cooled Condenser

High-Pressure Switch

Compressor

Refrigeration Circuit

Water Circuit

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2. DCM-751BWH(-OS)

Spout

Inlet Water Valve

Water Supply

Float

Switch

Water Level

Evaporator

Reservoir

Overﬂow

Drier

Thermostatic

Expansion Valve

To Drain

Drain Valve

Gear Motor

Dispense Water Valve

Water In

Water Out

Water-Cooled Condenser

Water Regulating

Valve

High-Pressure Switch

Compressor

Refrigeration Circuit

Water Circuit

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II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

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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 production, prepare a bucket or pan to catch the ice and a set of scales to

weigh the ice. After the appliance has operated for 10 to 20 minutes, catch the ice

production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the batch

weight by 144 to calculate 24hr production. When conﬁrming production or diagnosing

low production, see "VIII.B. Performance Data."

2. Diagnostic Procedure

This diagnostic procedure is a sequence check that allows you to diagnose the electrical

system and components. Before proceeding, check for correct installation, proper

voltage per unit nameplate, and adequate water supply. Check that the 24VAC 1A fuse

and GM 115VAC 3A fuse are good. When checking high-voltage (115VAC), always

choose a neutral (W) to establish a good neutral connection. When checking low-voltage

(24VAC), always choose a neutral (LBU) from CT to establish a good neutral connection.

When checking CB DC-voltage (5VDC), use CB red K4 connector pin closest to CB

black K3 connector for DC ground (GND). CB "POWER" LED remains on unless

power supply is interrupted. Check CB using the steps in "II.C. Control Board Check."

IMPORTANT! Appliance will not start unless the safety switch is engaged.

1) Turn on the power supply. Remove the front panel. Move the power switch to the "ON"

position, then move the control switch to the "DRAIN" position. Engage the safety

switch.

2) Allow the water system to drain for 5 minutes. If water does not drain, see step 12.

3) Disengage the safety switch, then move the control switch to the "OFF" position.

4) Move the power switch to the "OFF" position.

5) Remove the control box cover.

6) Engage the safety switch.

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7) Startup–"POWER OK" LED is on: Move the power switch to the "ON" position,

then move the control switch to the "ICE" position. CB "POWER OK" LED is on.

"POWER OK" LED Diagnosis: Check that CB "POWER" LED is on. If not, check for

proper power supply voltage (115VAC) input to CT. If 115VAC is not present, check the

breaker, power switch, and safety switch. Next, check that the power protect relay is

de-energized and contacts between terminals #6 (BR) and #2 (BK) are closed. Check

for proper control voltage (24VAC) output from CT. Next, check the 24VAC 1A fuse. If

open, replace. Check for 24VAC at CB K8 connector pin #1 (W/R) to CB K8 connector

pin #2 (LBU). If 24VAC is not present at CB K8 connector pin #1 (W/R) but is present at

1A fuse (W/R), check continuity of control switch. If open, replace. If 24VAC is present

between CB K8 connector pin #1 (W/R) and pin #2 (LBU), and "POWER OK" LED is

off, replace CB.

BC Diagnosis: Check that the actuator paddle is properly positioned. Check for

continuity across BC proximity switch. When BC proximity switch is closed 0VDC is

read across CB K8 connector pin #3 (GY) and #4 (GY). 5VDC is present between CB

K8 connector pin #3 (GY) or #4 (GY) to CB red K4 connector pin closest to CB black K3

black connector (5VDC GND). If 5VDC is not present, replace CB.

HPS Diagnosis: HPS automatically resets when refrigeration circuit high-side pressure

is within an acceptable range. 5VDC is supplied from CB K9 connector pin #3 (Y) and

back onto CB K9 connector pin #4 (Y). If 5VDC is not present at CB K9 connector pin

#3 (Y) to CB red K4 connector pin closest to CB black K3 connector (5VDC GND)

and CB "POWER OK" LED is on, replace CB. If refrigerant pressures have returned

to an acceptable range and HPS does not close, replace HPS. If pressures have not

equalized, and refrigeration circuit high-side pressure does not drop, recover, evacuate,

and recharge if necessary. On air-cooled model, check that the condenser is not dirty

or clogged, check for proper FM operation and fan blade for binding. On water-cooled

model, check WRV and water ﬂow in and out of condenser. Check for refrigeration

circuit refrigerant restriction (TXV and drier).

8) Fill Cycle–"WTRIN" LED is on: WV energizes. 90-sec. FT starts. LFS closes. Nothing

happens at this time. Reservoir continues to ﬁll. UFS closes, WV de-energizes, 90-sec.

FT terminates. Diagnosis: If the reservoir is empty, LFS open, "WTRIN" LED on, and

WV off, check for 24VAC at CB K2 connector pin #8 (W/BR) to a neutral (LBU).

If 24VAC is not present, conﬁrm 24VAC power supply at CB K2 connector pin #7 (W/R)

to a neutral (LBU). If 24VAC is not present on CB K2 connector pin #7 (W/R), check

wiring connections from CT. If 24VAC is present on CB K2 connector pin #7 (W/R)

and not on CB K2 connector pin #8 (W/BR), replace CB. If 24VAC is present on CB

K2 connector pin #8 (W/BR), check for 24VAC at WV solenoid. If 24VAC is present,

replace WV. If WV is energized and ﬁll/reﬁll exceeds 90-sec. FT with no water in the

reservoir, check for clogged WV screen or DV leaking. Note: If UFS remains open

90 seconds after LFS opens (WV energized), a 1-beep alarm sounds (90 sec. FT). This

alarm resets automatically once UFS closes. If reservoir is full and overﬂowing, check

for open UFS. See "II.E. Float Switch Check and Cleaning." If WV de-energizes and

water continues to ﬁll the reservoir, replace WV.

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9) Ice Purge Cycle–"GM" LED is on. UFS closes (WV de-energizes) and "WTRIN"

LED turns off. 5-sec. GM delay timer and 30-min. FZT start. 5-sec. GM delay timer

terminates. GM and GMPR energize. 5-min. IPT starts. GM runs for 5 min. to clear

any ice from the evaporator. Diagnosis: If "GM" LED is off, check that UFS closed.

If UFS is closed and "GM" LED does not turn on, replace CB. If "GM" LED is on and

GM is off, conﬁrm 115VAC at CB K1 connector pin #2 (BR) to neutral (W). Check for

115VAC at CB K1 connector pin #3 (DBU) to a neutral (W). If no voltage is present at

CB K1 connector pin #2 (BR), check wiring connections. If no voltage is present at CB

K1 connector pin #3 (DBU), replace CB. If 115VAC is present, check 115VAC 3A GM

fuse, GM internal protector, GM windings, capacitor, and GM coupling between auger

and GM. If GM internal protector is open, allow to cool and reset. If reset does not

occur, replace GM. If Comp energizes at the same time GM energizes, check CB.

See "II.C. Control Board Check."

10) Freeze Cycle–"COMP" and "GM" LEDs are on. 5 min. IPT terminates. GM continues.

CB conﬁrms GM operation through GMPR terminal #3 (W/O) and terminal #5 (W/O).

Comp and FM energize. Ice production begins 4 to 6 min. after Comp and FM energize

depending on ambient and water temperature conditions. Diagnosis: 5 min. after GM

energizes, conﬁrm Comp LED turns on and Comp and FM energize. If not, check

that GMPR is energized (115VAC). Next, check continuity between GMPR terminal

#3 (W/O) and terminal #5 (W/O). If open, GMPR is de-energized or defective. If closed,

and "COMP" LED is not on, replace CB. If "COMP" LED turns on and Comp and FM

do not energize, conﬁrm 115VAC at CB Comp X1 relay (BR) to a neutral (W). If 115VAC

is not present, check connections. If 115VAC is present, conﬁrm 115VAC at CB Comp

X1 relay (R) to a neutral (W). If 115VAC is not present and "COMP" LED is on, replace

CB. If 115VAC is present, check Comp external protector (overload), allow to cool and

reset. If reset does not occur, replace external protector. Check Comp start and run

capacitors, Comp start relay, and Comp windings. If FM does not energize, check FM

run capacitor, that the fan blade is not binding, and that FM windings are good.

11) Reﬁll/Low Water Safety–"COMP," "GM," and "WTRIN" are on. As ice is produced,

the water level in the reservoir drops. UFS opens. Nothing happens at this time. When

LFS opens, 90-sec. FT starts. WV energizes. Comp, FM, and GM continue. As water

ﬁlls the reservoir, LFS closes. Nothing happens at this time. When UFS closes, WV

de-energizes, 90-sec. FT terminates, and 30-min. FZT resets. This continues until BC

shuts down the appliance or power is turned off to the appliance. Diagnosis: Conﬁrm

that the water level has dropped and UFS and LFS are open. See "II.E. Float Switch

Check and Cleaning." Check for dirty or sticking ﬂoat switches, clogged WV screen,

defective WV coil, or DV leaking by. If UFS remains open 90 seconds after LFS opens

(WV energized), a 1-beep alarm sounds (90 sec. FT). This alarm resets automatically

once UFS closes. Comp and FM de-energize. GM de-energizes 90 sec. later. WV and

alarm continue until UFS closes.

Note: Each time UF/S closes, 30-minute FZT starts. 30-minute FZT resets when UF/S

closes again. If UF/S does not close again within 30 minutes, CB shuts down the

appliance and sounds a 5-beep alarm every 5 seconds. See "III.B. LED Lights

and Audible Alarm Safeties."

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12) Drain Cycle–"FLUSH" (drain) LED is on. IMPORTANT! Drain valve will not energize

unless the safety switch is engaged. The appliance is factory set to drain the

evaporator and reservoir once every hour for 2 seconds. A manual drain is provided

when cleaning the appliance by moving the control switch from the "ICE" position to the

"DRAIN" position. A 1-in-12 drain cycle is also available. For further details, see "III.C. 3.

Drain Frequency Control (S1 dip switch 4)."

a) Automatic Drain Cycle: A drain cycle occurs once every hour for 2 seconds.

DCT terminates and DVT starts. Once DVT terminates, DCT resets and DV

de-energizes. DCT resets every time the power supply is turned off and on again.

Diagnosis: Once DCT terminates, DV energizes. If not, check for 24VAC from

K2 connector pin #10 (W/BU) to a neutral (LBU). If 24VAC is not present, replace CB.

If 24VAC is present, check for 24VAC at DV. If 24VAC is present and DV does not

energize, check DV solenoid continuity.

b) Manual Drain: Move control switch to the "OFF" position, pause momentarily, then

move to the "DRAIN" position. DV energizes.

DV continues until control switch is moved to "OFF" or "ICE" position or power is

turned off.

Note: a) A momentary pause in the "OFF" position is necessary to de-energize the

control board when moving the control switch between "ICE" and "DRAIN."

Otherwise there is a delay of several minutes before the new selection takes

effect.

b) If the control switch is left in the "DRAIN" position for 10 minutes or more, a

2-beep alarm sounds every 5 seconds. Move the control switch out of the

"DRAIN" position to clear the alarm.

Diagnosis: DV energizes. If not, check for 24VAC at CB K2 connector pin

#10 (W/BU) to a neutral (LBU). If 24VAC is not present, conﬁrm 24VAC power

supply to CB K2 connector pin #9 (W/R) to a neutral (LBU). If 24VAC is present on

CB K2 connector pin #9 (W/R) and not on CB K2 connector pin #10 (W/BU), check

for 5VDC at CB K9 connector pin #1 (W/BK) to CB red K4 connector pin closest to

CB black K3 connector. If 5VDC is not present on CB K9 connector pin #1 (W/BK),

replace CB. If 5VDC is present on CB K9 connector pin #1 (W/BK), check for 5VDC

at CB K9 connector pin #2 (W/BK) to CB red K4 connector pin closest to CB black

K3 connector. If 5VDC is not present on pin #2 (W/BK), check continuity of control

switch. If open, place in "DRAIN" position or replace control switch.

If 24VAC is present at CB K2 connector pin #10 (W/BU), check for 24VAC at DV. If

24VAC is present and DV does not energize, check DV solenoid continuity.

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13) Shutdown–Bin ﬁlls and ice engages BC actuator paddle. 6 to 10-sec. shutdown

sequence begins. Diagnosis: Check that BC actuator paddle is activated and not

sticking. Check BC proximity switch continuity to conﬁrm BC proximity switch is open.

If BC actuator is engaged and BC proximity switch is closed, replace BC proximity

switch. If BC proximity switch is open and Comp, FM, and GM do not de-energize,

replace CB. See "II.C. Control Board Check."

Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor;

CT–control transformer; DCT–drain cycle timer (1-hr.); DV–drain valve;

DVT–drain valve timer (2-sec.); FM–fan motor; FT–ﬁll timer (90-sec. low water

safety); FZT–freeze timer; GM–gear motor; GMPR–gear motor protect relay;

HPS–high-pressure switch; IPT–ice purge timer; LFS–lower ﬂoat switch;

TXV–thermostatic expansion valve; UFS–upper ﬂoat switch;

WRV–water regulating valve; WV–inlet water valve

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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 and 115VAC 3A GM fuse are good.

• 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 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.

• 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).

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. NOTICE! Appliance will not start unless the

safety switch is engaged. 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.

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2) 5VDC Output Checks: There are seven 5VDC circuits on the appliance, "DRAIN"

position through control switch, high-pressure switch (HPS), gear motor protect

relay (GMPR), bin control (BC), ﬂoat switch (FS), ice dispense switch, and water

dispense switch.

• 5VDC CB K9 Connector: See Fig. 1.

5VDC CB K9 Connector

Component

Pin # (Wire Color)

"DRAIN" Position Through Control Switch #1 (W/BK) and #2 (W/BK)

High-Pressure Switch (HPS)

#3 (Y) and #4 (Y)

Gear Motor Protect Relay (GMPR)

(terminals #3 and #5)

#5 (W/O) and #6 (W/O)

Multimeter

5VDC

Red positive

test lead to

red K4 connector

pin closest

to black K3

connector

"DRAIN" Position on

Control Switch

(W/BK)

Black Negative

Test Lead

Red Positive

Test Lead

High-Pressure Switch (HPS)

(Y)

Gear Motor Protect Relay (GMPR)

Terminals #3 and #5 (W/O)

Control Board K9 Connector

Fig. 1

a. "DRAIN" Position on Control Switch

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

• When 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, 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.

• When control switch is in the "DRAIN" position, CB K9 connector pin #1 (W/BK)

and pin #2 (W/BK) are closed. 5VDC is present between both CB K9 connector

pin #1 (W/BK) and pin #2 (W/BK) to CB red K4 connector, pin closest to CB black

K3 connector. If 5VDC is not present, 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.

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c. Gear Motor Protect Relay (GMPR)

CB K9 connector pins #5 (W/O) and #6 (W/O): When GMPR is de-energized,

GMPR terminals #3 and #5 are open and 5VDC is present between

CB K9 connector pin #5 (W/O) and CB red K4 connector pin closest to CB black

K3 connector. If 5VDC is not present, replace CB. When GMPR is energized, GMPR

terminals #3 and #5 are closed and 5VDC is present between CB K9 connector

pin #5 (W/O) and pin #6 (W/O) to CB red K4 connector pin closest to CB black

K3 connector. If GM is energized and GMPR terminals #3 & #5 are open, an 8-beep

alarm occurs. See "III.B. LED Lights and Audible Alarm Safeties."

• 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 (DBU)

d. Bin Control (BC)

CB K8 connector pins #3 (GY) and #4 (GY): When BC is closed (calling for ice),

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."

e. Float Switch (FS): CB K8 connector pins #5 common (BK), #6 UFS (R), and

#7 LFS (DBU): 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."

Multimeter

Red positive

test lead to red

K4 connector

pin closest

5VDC

to black K3

connector

Red Positive

Test Lead

Black Negative

Test Lead

Control Board K8 Connector

Bin Control (GY)

Lower Float Switch (LFS) (DBU)

Float Switch (FS) Common (BK)

Upper Float Switch (UFS) (R)

Fig. 2

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• 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6.

• Water Dispense Switch/Water Dispense Sensor

f. Push Button Model–"WTRDP" LED is on: Before engaging the water dispense

switch, 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 water dispense switch. "WTRDP" LED turns on. If

not, conﬁrm that the water dispense signal VDC matches the "Engaged" column 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

Water Dispense Signal #8 (DBU)

#3 (BR)

5VDC

0VDC

5VDC

Red K4 pin closest

to black K3

Multimeter

5VDC

Red Positive

Test Lead

Red positive

test lead to red

K4 connector

pin closest

Black Negative

Test Lead

to black K3

Control Board K7 Connector

connector

Water Dispense (BR)

(5VDC power supply)

Water Dispense (DBU)

(switch signal)

Fig. 3

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g. Opti-Serve Model–"WTRDP" LED is on: Before engaging the water dispense

Opti-Serve 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 Opti-Serve 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 Opti-Serve 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

Water Dispense Signal #8 (W)

5VDC Power Supply

#7 (R)

0VDC

5VDC

0VDC

5VDC

Red K4 pin closest

to black K3

#9 (BK)

Multimeter

5VDC

Red Positive

Test Lead

Red positive

test lead to red

K4 connector

pin closest

Black Negative

Test Lead

Control Board K7 Connector

to black K3

connector

Water Dispense (BK)

(5VDC power)

Water Dispense (W)

(switch signal)

Water Dispense (R)

(VDC GND)

Fig. 4

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• Ice Dispense Switch/Ice Dispense Sensor:

h. Push Button Model–"ICE" and "AM" LEDs are on: Before engaging the

ice dispense switch, 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 ice dispense switch. "ICE" LED

turns on. If not, conﬁrm position of dispense mode switch and that the portion and

continuous VDC matches the "Engaged" column in the table below. If not, check the

ice dispense switch continuity when engaged (closed) and the dispense mode switch

continuity. If dispense switch is open when engaged, replace. If dispense mode

switch is open, replace. If the VDC matches the "Engaged" column below and the

"ICE" LED does not turn on, replace CB.

Note: "AM" LED turns on .6 sec. for every 12 sec. of cumulative dispense time.

5VDC CB K7 Connector

Component

Pin # (Wire Color) To CB VDC Ground Disengaged Engaged

Portion Signal

5VDC Power Supply

Continuous Signal

#5 (R)

#3 (BR)

#2 (Y)

0VDC

5VDC

0VDC

5VDC

Red K4 pin closest

to black K3

Multimeter

5VDC

Red positive

test lead to red

K4 connector

pin closest

Red Positive

Test Lead

to black K3

connector

Black Negative

Test Lead

Control Board K7 Connector

Ice Dispense (Y)

(continuous signal)

Ice Dispense (R)

(portion signal)

Ice Dispense (BR)

(5VDC power supply)

Fig. 5

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i. Opti-Serve Model–"ICE" and "AM" LEDs are on: Before engaging the ice dispense

Opti-Serve 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 reading is correct, engage the Opti-Serve sensor. "ICE" LED

turns on. If not, conﬁrm position of dispense mode switch and that the portion and

continuous VDC matches the "Engaged" column in the table below. If not, check the

dispense mode switch continuity. If open, replace. If dispense mode switch is closed

(portion or continuous), replace the Opti-Serve sensor. If the VDC matches the

"Engaged" column below and the "ICE" LED does not turn on, replace CB.

Note: "AM" LED turns on .6 sec. for every 12 sec. of cumulative dispense time.

5VDC CB K7 Connector

Component

Pin # (Wire Color) To CB VDC Ground Disengaged Engaged

5VDC

0VDC

5VDC

0VDC

5VDC

5VDC Power Supply

VDC Sensor Ground

Continuous Signal

Portion Signal

#3 (W/BK)

#1 (W/R)

#2 (W)

Red K4 pin closest

to black K3

#5 (W/O)

Multimeter

5VDC

Red Positive

Test Lead

Red positive

test lead to red

K4 connector

pin closest

to black K3

connector

Black Negative

Test Lead

Control Board K7 Connector

Ice Dispense (W/R)

(VDC ground)

Ice Dispense (W)

Ice Dispense (W/O)

(portion signal)

(continuous signal)

Ice Dispense (W/BK)

(5VDC power supply)

Fig. 6

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3) Fill Cycle–"WTRIN" LED is on: "WTRIN" LED turns on only when the reservoir water

level is low enough to open LFS. Diagnosis: Conﬁrm LFS is open. If "WTRIN" LED

is off and LFS is open and the control switch is in the "ICE" position (open), replace

CB. If "WTRIN" LED is on and water is not ﬁlling the reservoir, check for 24VAC at

CB K2 connector between pin #8 (W/BR) and a neutral (LBU). If the "WTRIN" LED is

on and 24VAC is not present between CB K2 connector pin # 8 (W/BR) and neutral

(LBU), conﬁrm 24VAC at CB K2 connector between pin #7 (W/R) and a neutral (LBU).

If 24VAC is present between CB K2 connector pin #7 (W/R) and a neutral (LBU) and

not between CB K2 connector pin #8 (W/BR) and a neutral (LBU), replace CB.

24VAC CB K2 Connector

LFS

Connector

Pin # (Wire Color) To Neutral (LBU)

Open

Closed

K2 (CB input power)

K2 (WV power)

Pin #7 (W/R)

Pin #8 (W/BR)

24VAC

0VAC

24VAC

K8 pin #2 (LBU)

4) Ice Purge Cycle–"GM" LED is on: "GM" LED turns on once UFS closes (reservoir

full). If UFS is closed and "GM" LED is off, replace CB. If "GM" LED is on but GM does

not start, check for 115VAC from CB K1 connector pin #3 (DBU) to a neutral (W).

If 115VAC is not present, conﬁrm 115VAC from CB K1 connector pin #2 (BR) to a

neutral (W). If 115VAC is present on CB K1 connector pin #2 (BR) but not on CB

K1 connector pin #3 (DBU), replace CB.

5) Freeze Cycle–"GM" and "COMP" LED are on: 5-minute ice purge timer 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 taken not to touch live

terminals. After 5-minute ice purge timer terminates, "COMP" LED turns on. If not,

replace CB. If "COMP" LED turns on and Comp does not start, check for 115VAC from

the CB X1 relay (BR) and (R) to a neutral (W). If 115VAC is present on CB X1 relay (BR)

and not on CB X1 relay (R), replace CB.

Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor;

CT–control transformer; DCT–drain cycle timer (1-hr.); DV–drain valve;

DVT–drain valve timer (2-sec.); FM–fan motor; FT–ﬁll timer (90-sec. low water

safety); GM–gear motor; GMPR–gear motor protect relay; IPT–ice purge timer;

LFS–lower ﬂoat switch; UFS–upper ﬂoat switch; WV–inlet water valve

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D. Bin Control Check

When the actuator paddle is not engaged, BC is closed and the appliance produces ice.

S1 dip switch 7 must be in the "OFF" position. When ice ﬁlls the chute and engages

the actuator paddle, BC opens and CB shuts down the appliance within 10 seconds.

NOTICE! Do not place S1 dip switch 7 in the "ON" position. For details, see "III.C.1.

Default Dip Switch Settings."

1) Remove the front and top panels.

2) Remove the storage bin cover. If necessary, dispense ice or remove ice manually so

that the BC actuator paddle is not engaged.

IMPORTANT! Appliance will not start unless the safety switch is engaged.

WARNING! Keep hands, hair, and loose clothing clear of the agitator rotating

inside of the storage bin.

3) Move the control switch to the "OFF" position.

4) Move the power switch to the "OFF" position.

5) Turn off the power supply.

6) Disconnect BC connector from the back of the control box.

7) Check for continuity across BC proximity switch. If BC actuator is not engaged and BC

proximity switch is open, replace BC proximity switch.

8) Press and hold BC actuator paddle. While BC actuator is engaged, check for continuity

across BC proximity switch. If BC actuator is engaged and BC proximity switch is open,

replace BC proximity switch.

9) Disengage BC actuator paddle.

10) Reconnect BC connector. Remove the control box cover.

11) Turn on the power supply. Move the power switch to the "ON" position.

12) Move the control switch to the "ICE" position.

13) Engage the safety switch to start the automatic icemaking process.

14) Make sure the "GM" LED is on. There is a delay of at least 5 seconds before the "GM"

LED turns on after power-up. After the "GM" LED turns on, press the "SERVICE" button

on CB to bypass the 5-minute compressor delay. WARNING! Risk of electric shock.

Care should be taken not to touch live terminals. The "COMP" LED turns on.

15) When Comp starts, press and hold BC actuator paddle.

16) Comp and GM should de-energize within 10 seconds. Diagnosis: If not, and BC is

found open and the appliance continues to run, replace CB.

17) Move the power switch to the "OFF" position and turn off the power supply.

18) Move the power switch to the "ON" position.

19) Replace the storage bin cover, control box cover, top panel, and front panel in their

correct positions.

20) Turn on the power supply to start the automatic icemaking process.

Legend: BC–bin control; CB–control board; Comp–compressor;GM–gear motor

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E. Float Switch Check and Cleaning

1. Float Switch Check

1) Remove the front panel and move the control switch to the "DRAIN" position.

2) Press and hold the safety switch to start draining the appliance.

IMPORTANT! Appliance will not start unless the safety switch is engaged.

3) Allow the water to drain from the reservoir, then release the safety switch. Move the

control switch to the "ICE" position.

4) Remove the FS molex plug from the control box and check continuity across FS wires.

Black (BK) to red (R) for the upper ﬂoat and black (BK) to dark blue (DBU) for the lower

ﬂoat. See Fig. 7. With the water reservoir empty, the ﬂoat switches are open. If open,

continue to step 5. If closed, follow the steps in "II.E.2. Float Switch Cleaning." After

cleaning the ﬂoat switches, check them again. Replace if necessary.

5) Replace the FS molex plug on the control box.

6) Press and hold the safety switch to start ﬁlling the reservoir.

7) Once the reservoir is full and GM starts, release the safety switch.

8) Remove the FS molex plug from the control box and check continuity across FS wires.

Black (BK) to red (R) for the upper ﬂoat and black (BK) to dark blue (DBU) for the lower

ﬂoat. They should be closed. If open, follow the steps in "II.E.2. Float Switch Cleaning."

After cleaning the ﬂoat switches, check them again. Replace if necessary.

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 panel and move the control switch to the "DRAIN" position.

2) Press and hold the safety switch to start draining the appliance.

3) Allow the water to drain from the reservoir, then release the safety switch.

4) Turn off the power supply.

5) Remove FS assembly from the reservoir cover. See Fig. 8.

6) Wipe down FS assembly with a mixture of 1 part Hoshizaki Scale Away and 25 parts

warm water. Rinse the FS assembly thoroughly with clean water.

7) While not necessary, the ﬂoats can be removed from the shaft during cleaning. If you

remove them, note that the blue ﬂoat is on top. The ﬂoats must be installed with the

magnets inside them towards the top of the switch. See Fig. 8. Installing the ﬂoats

upside down will affect the timing of FS operation.

8) Rinse FS assembly thoroughly with clean water and replace in its original position.

9) Replace the front panel in its correct position.

10) Move the control switch to the "ICE" position.

11) Turn on the power supply to start the automatic icemaking process.

Legend: Comp–compressor; FS–ﬂoat switch; GM–gear motor

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Red (R)

(upper ﬂoat switch)

Black (BK)

(common)

Dark Blue (DBU)

(lower ﬂoat switch)

Magnet (towards top)

Upper Float (blue)

Spring Retainer Clip

Plastic Retainer Clip

Magnet (towards top)

Lower Float (white)

Fig. 7

Float Switch Assembly

Reservoir Cover

Reservoir

Fig. 8

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F. Diagnostic Tables

Before consulting the diagnostic tables, check for correct installation, proper voltage per

appliance nameplate, and adequate water pressure (10 to 113 PSIG). Check control

board using the steps in "II.C. Control Board Check."

1. No Ice Production

No Ice Production - Possible Cause

Startup

1. Power Supply

a) Off, blown fuse, or tripped breaker.

b) Loose connection.

c) Not within speciﬁcations.

a) "OFF" position.

2. Power Switch

b) Defective.

3. Safety Switch

a) Safety switch not engaged.

b) Defective.

4. Power Protect Relay

a) Energized. Voltage not within speciﬁcations.

b) Defective.

5. Control Transformer

a) Coil winding open or shorted.

a) Blown.

6. 1A 24VAC Fuse (Control Box)

7. Control Board

See "II.C. Control Board Check"

a) In alarm. See "III.B. LED Lights and Audible Alarm Safeties."

b) Defective.

8. Control Switch

a) In "DRAIN" position.

b) Bad contacts.

9. Bin Control

a) Tripped with bin ﬁlled with ice.

b) Proximity switch defective.

c) Actuator paddle does not move freely.

10. High-Pressure Switch

a) Control board in 3 or 4-beep alarm. See "III.B. LED Lights and

Audible Alarm Safeties."

Fill Cycle

1. Control Board

2. Inlet Water Valve

3. Water Supply

4. Float Switch

5. Drain Valve

a) No power to inlet water valve.

b) No power to ﬂoat switch or not reading ﬂoat switch condition.

a) Screen or oriﬁce clogged.

b) Coil winding.

a) Water supply off or improper water pressure.

b) External water ﬁlters clogged.

a) Float does not move freely.

b) Defective.

a) Sticking.

Ice Purge Cycle

1. Control Board

2. Gear Motor

a) No power to gear motor.

b) No power to gear motor protect relay circuit (5VDC).

a) 3A fuse blown.

b) Internal protector open.

c) Motor winding.

d) Mechanical failure.

3. Coupling

a) Defective.

4. Gear Motor Protect Relay

a) Defective.

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No Ice Production - Possible Cause

Freeze Cycle

a) Defective.

1. Control Board

2. Start Relay

3. Start Capacitor or Run 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.

a) Capacitor defective.

b) Motor winding.

6. Fan Motor

7. Evaporator

c) Bearing worn out or locked rotor.

a) Dirty.

b) Damaged or defective.

a) Bulb loose.

8. Thermostatic Expansion Valve

(TXV)

b) Operating erratically.

a) Low.

9. Refrigerant Charge

10. Drain Valve

a) Dirty, leaking by.

b) Defective coil.

c) Defective control board.

a) Water leaks.

11. Water System

Reﬁll

1. Water Supply

2. Control Board

a) Off.

a) No power to ﬂoat switch or not reading ﬂoat switch condition.

b) No power to inlet water valve.

a) Float does not move freely.

b) Defective.

3. Float Switch

4. Inlet Water Valve

1. Bin Control

a) Clogged or defective.

Shutdown

a) Actuator paddle sticking open.

b) Proximity switch defective.

a) Defective.

2. Control Board

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2. Ice/Water Dispensing

Ice Dispense-Push Button

1. Power Supply

2. Control Board

a) Off, blown fuse, or tripped breaker.

a) Ice dispense switch circuit open or no power (5VDC) from control

board.

b) No power (115VAC) to ice dispense solenoid, ice dispense motor, or

agitating motor.

3. Ice Dispense Switch

4. Dispense Mode Switch

5. Ice Dispense Motor

a) Defective.

a) Motor windings.

b) Mechanical failure.

6. Ice Dispense Solenoid

7. Shutter Assembly

8. Agitating Motor

a) Defective or loose connection.

a) Defective.

a) Motor windings.

b) Mechanical failure.

Ice Dispense-Opti-Serve

a) Off, blown fuse, or tripped breaker.

a) No power to dispense mode switch.

b) Dispense mode switch circuit open.

1. Power Supply

2. Control Board

c) No power to ice dispense solenoid, ice dispense motor, or agitating

motor.

3. Infrared Sensor

a) Defective.

4. Dispense Mode Switch

5. Ice Dispense Motor

a) Defective (open).

a) Motor windings.

b) Mechanical failure.

a) Defective or loose connection.

a) Defective.

6. Ice Dispense Solenoid

7. Shutter Assembly

8. Agitating Motor

a) Motor windings.

b) Mechanical failure.

Water Dispense-Push Button

a) Off, blown fuse, or tripped breaker.

a) Defective.

1. Power Supply

2. Water Dispense Switch

3. Water Dispense Valve

a) Water supply turned off.

b) Defective.

Water Dispense-Opti-Serve

a) Off, blown fuse, or tripped breaker.

a) Defective.

1. Power Supply

2. Infrared Sensor

3. Control Board

a) No power to infrared sensor.

b) No power to water dispense valve.

a) Water supply turned off.

b) Defective.

4. Water Dispense Valve

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III. Controls and Adjustments

• A Hoshizaki exclusive control board is employed in the DCM-751 series.

• All models are pretested and factory set.

• For a control board check procedure, see "II.C. Control Board Check."

NOTICE

• Fragile, handle very carefully.

• The 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

appliance when 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 to test for voltage.

• Always replace the whole control board assembly if it goes bad.

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A. Control Board Layout

1. DCM-751B_H

High-Pressure Switch

#3 to #4 (Y)

Gear Motor Protect Relay Circuit

#5 to #6 (W/O)

Relay De-Energized-Open-5VDC

Relay Energized-Closed-0VDC

Open-5VDC

Closed-0VDC

Control Switch

#1 to #2 (W/BK)

"ICE"-Open-5VDC

"DRAIN"-Closed-0VDC

• K9 Connector

• "SERVICE" Button

(Ice Purge Cycle Bypass)

5VDC

• K8 Connector

Transformer 24VAC Input

#1 (W/R)

• K1 Connector

#3 GM (DBU)

#2 GM Voltage

Input (BR)

Transformer 24VAC Neutral

#2 (LBU)

Mechanical Bin Control

#3 to #4 (GY)

• K2 Connector

Drain Valve

#10 (W/BU)

Float Switch Output

#5 (BK)(+)

Transformer Input

#9 (W/R)

Inlet Water Valve

#8 (W/BR)

Upper Float Switch

#6 (R)

Transformer Input

#7 (W/R)

Lower Float Switch

#7 (DBU)

Dispense Water

Valve #6 (W/O)

24VAC Input

#5 (W/R)

• K7 Connector

Continuous Ice Dispense

Signal #2 (Y)

Water/Ice Dispense

Output #3 (BR)(+)

Agitating Motor

#4 (O)

115VAC Input

#3 (BK)

Portion Ice Dispense

Signal #5 (R)

Dispense Motor

#2 (P)

115VAC Input

#3 (BK)

Water Dispense Signal

#8 (DBU)

• "POWER OK" LED

LED Legend:

• S1 Dip Switch

AM-agitating motor

COMP-compressor

FLUSH-drain valve

GM-gear motor

ICE-dispense motor

WTRDP-water dispense valve

WTRIN-inlet water valve

5VDC Ground (GND) Terminals

• K6 Connector

Open

Fig. 9a

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2. DCM-751B_H-OS

High-Pressure Switch

#3 to #4 (Y)

Open-5VDC

Closed-0VDC

Control Switch

Gear Motor Protect Relay Circuit

#5 to #6 (W/O)

Relay De-Energized-Open-5VDC

Relay Energized-Closed-0VDC

#1 to #2 (W/BK)

"ICE"-Open-5VDC

"DRAIN"-Closed-0VDC

• K9 Connector

• "SERVICE" Button

(Ice Purge Cycle Bypass)

5VDC

• K8 Connector

• K1 Connector

#3 GM (DBU)

#2 GM Voltage

Input (BR)

Transformer

24VAC Input

#1 (W/R)

Transformer

24VAC Neutral

#2 (LBU)

• K2 Connector

Drain Valve

#10 (W/BU)

Mechanical Bin Control

#3 to #4 (GY)

Transformer Input

#9 (W/R)

Float Switch Output

#5 (BK)(+)

Inlet Water Valve

#8 (W/BR)

Upper Float Switch #6 (R)

Lower Float Switch #7 (DBU)

Transformer Input

#7 (W/R)

Dispense Water

Valve #6 (W/O)

• K7 Connector

Ice OS Sensor GND

#1 (W/R)

24VAC Input

#5 (W/R)

Continuous Ice Dispense

Signal #2 (W)

Agitating Motor

#4 (O)

115VAC Input

#3 (BK)

Ice OS Sensor Output

#3 (W/BK)(+)

Portion Ice Dispense

Signal #5 (W/O)

Dispense Motor

#2 (P)

115VAC Input

#3 (BK)

• "POWER OK" LED

• S1 Dip Switch

Water OS Sensor GND

#7 (R)

Water Dispense Signal

#8 (W)

Water OS Sensor

Output #9 (BK)(+)

• K6 Connector

Open

LED Legend:

5VDC Ground (GND) Terminals

AM-agitating motor

COMP-compressor

FLUSH-drain valve

GM-gear motor

ICE-dispense motor

WTRDP-water dispense valve

WTRIN-inlet water valve

Fig. 9b

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B. LED Lights and Audible Alarm Safeties

The "POWER" LED indicates proper control voltage and will remain on unless a control

voltage problem occurs. For further details, see "II. Sequence of Operation and Service

Diagnosis."

Icemaking Sequence

Energized

Sequence Step

LED

Components

Min.

Max.

Fill Cycle

WTRIN

On until UFS closes. Alarm sounds

after 90 sec.

Ice Purge Cycle GM

GM, FM

5 min.

Freeze Cycle

(with reﬁll)

GM, WTRIN* (reﬁll), GM, Comp,

COMP

*On until UFS closes. Alarm

sounds after 90 sec.

FM, WV*

(reﬁll)

Drain Cycle

FLUSH (Drain)

2 sec.

10 min.

Dispensing Sequence

Energized

Components

IDS**, IDM**, *AM energizes

**Dispense Mode Switch

Sequence Step

LED

Time LEDs are on

Continuous

Portion

Ice Dispense

Activation

ICE, AM*

60 sec. per

activation

Adjustable

between 0.2 sec.

and 20 sec.

AM*

.6 sec. every 12

sec. of cumulative

dispense time

Dispense Water WTRDP

Valve Activation

DispWV

The built-in alarm safeties shut down the appliance.

No. of Beeps

Type of Alarm

(every 5 sec.)

Reset Options

Automatic reset once water supply is restored

Low Water Safety

UFS open > 90 seconds after WV energized. and UFS closes.

Control Switch

In "DRAIN" position longer than 15 minutes. moved to the "ICE" position.

High-Pressure Switch

Automatic reset once the control switch is

Automatic reset once pressure drops

below the high pressure threshold and the

high-pressure switch closes.

First and second activation in 1 hour.

High-Pressure Switch

Third activation in 1 hour.

Call for service. To avoid possible catastrophic

failure, it is recommended to leave the

appliance off until this alarm is resolved.

Manual reset. Turn power off and on again.

Freeze Timer

WV off > 30 minutes since last WV activation.

Low Voltage

(92Vac 5% or less)

High Voltage

(147Vac 5% or more)

Gear Motor

GMPR contacts fail to close.

Manual reset. Turn power off and on again.

"POWER OK" LED turns off if voltage

protection operates.

The control voltage safeties automatically

reset when voltage is corrected.

Manual reset. Turn power off and on again.

Infrared Sensor (S1 dip switch 7)

(Not used on this model)

Manual reset. Turn power off and on again.

Legend: AM–agitating motors, Comp–compressor; DispWV–dispense water valve;

DV–drain valve; EH–evaporator heater; FM–fan motor; GM–gear motor;

GMPR–gear motor protect relay; IDM–ice dispensing motor; IDS–ice dispensing

shutter solenoid; UFS–upper ﬂoat switch; WV–inlet water valve

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C. Settings and Adjustments

NOTICE

Dip switches are factory set. Failure to maintain factory settings may adversely

affect performance and warranty coverage. For more information, contact Hoshizaki

Technical Support at 1-800-233-1940.

1. Default Dip Switch Settings

The S1 dip switch settings are factory-set to the following positions:

Dip Switch No.

DCM-751B_H

OFF OFF OFF OFF ON ON OFF ON OFF OFF

DCM-751B_H(-OS) OFF OFF OFF OFF OFF ON OFF ON OFF OFF

Normally off (factory use)

Mechanical Bin Control Shutdown Delay

Bin Control Selector

Continuous Dispensing Timer

(DCM models only, do not adjust on modular appliances)

Drain Frequency Control

Infrared Sensor Shutdown Delay

2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)

NOTICE

Do not adjust. Setting not used on this model. When dip switch 7 is off, 1, 2, and 3

are ignored.

Factory set. DCM-751B_H(-OS) does not use an infrared sensor bin control. The

appliance uses a mechanical bin control 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 allows for removal of sediment from the

evaporator without interrupting the icemaking process. 1-in-12 drain cycle is available.

S1 Dip Switch Setting

Drain Timer Interval Drain Valve Open

No. 4

OFF (1-in-1)

ON (1-in-12)

1 Hour

2 Seconds

10 Minutes

11 Hours 45 Minutes

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4. Continuous Dispensing Timer (S1 dip switch 5 & 6)

The dispense mode switch must be in the "CONTINUOUS" position for this setting to

apply. The factory setting allows ice to be dispensed continuously on push button models

and for a maximum of 60 sec. on Opti-Serve models.

S1 Dip Switch Setting

Dispense Time

No. 5

OFF

No. 6

OFF

No Limit

20 Seconds

60 Seconds

No Limit

OFF

5. Bin Control Selector (S1 dip switch 7)

The appliance is factory set for mechanical bin control operation. No adjustment is

required. In the factory default position (S1 dip switch 7 in the 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

No. 7

OFF

Bin Control Application

Mechanical Bin Control

Gear Motor Delay

5 seconds

Infrared Sensor with

Mechanical Bin Control Backup

30 seconds

6. Bin Control Shutdown Delay (S1 dip switch 8)

Factory set for normal operation. No adjustment is required. The shutdown delay is the

time between the mechanical bin control proximity switch opening and the control board

shutting off the appliance.

S1 Dip Switch

Bin Control #1

Setting

Shutdown Delay

No. 8

OFF

0.25 Seconds

6.7 Seconds

7. Factory Use (S1 Dip Switch 9 & 10)

Factory set for optimum performance. Do not adjust.

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D. Power Switch, Control Switch, and Dispense Mode Switch

The power switch, control switch, and dispense mode switch are used to control the

operation of the appliance.

1. Power Switch

WARNING! The power switch does not turn off all power

supply to the unit. 115VAC power supply is present on

control board K1 connector pin #2 (BR) and control board

X1 relay (BR) when the power switch is in the "OFF"

Fig. 10

position.

2. Control Switch

The control switch has 3 positions, "ICE," "OFF," and "DRAIN." See Fig. 11.

a) ICE

When the control switch is in the "ICE" position, 24VAC is

directed to control board K8 connector pin #1. 24VAC is present

between control board K8 connector pins #1 (power) and

pin #2 (neutral).

CONTROL

ICE

OFF

b) OFF

DRAIN

When the control switch is in the "OFF" position, 24VAC is

broken to control board K8 connector pin #1.

Fig. 11

c) DRAIN

When the control switch is in the "DRAIN" position, 24VAC is

directed to control board K8 connector pin #1. 24VAC is present

between control board K8 connector pins #1 (power) and

pin #2 (neutral). Also, a 5VDC circuit is closed on control board

K9 connector pins #1 and #2. This energizes an internal relay

on the control board which allows 24VAC to the drain valve from

control board connector K2 pin #10.

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3. Dispense Mode Switch

The dispense mode switch has 2 positions, "CONTINUOUS" and "PORTION." See

Fig. 12.

a) CONTINUOUS

When the dispense mode switch is in the "CONTINUOUS" position, ice dispenses as

follows:

Push Button: Ice dispenses continuously with button engaged.

OS: Ice dispenses for a maximum of 60 seconds per activation.

b) PORTION

When the dispense mode switch is in the "PORTION" position, ice dispenses for the

amount of time determined by the ice dispense time setting.

DISPENSE MODE

PORTION

Fig. 12

CONTINUOUS

The ice dispense time control is located on the control board. The dial indicates

dispense time in seconds and is adjustable between 0.6 and 20 seconds. When

shipped, the ice dispense time control is set to the minimum dispense time of 0.6 sec.

(approximately 0.72 oz.).

Ice Dispense

Time Control

Fig. 13

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IV. Removal and Replacement of Components

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.

• Move the control switch and the power switch to the "OFF" position and turn off

the power supply before servicing. Lockout/Tagout to prevent the power supply

from being turned back on inadvertently.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the equipment is serviced. Make sure that none have fallen

into the storage bin.

• Make sure all food zones in the appliance and storage bin are clean after the

appliance is serviced.

• When replacing evaporator assembly and water circuit components, make sure

there are no water leaks after the repair is complete.

A. Service for Refrigerant Lines

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by

properly trained and EPA-certiﬁed service personnel.

• Always recover the refrigerant and store it in an approved container. Do not

discharge the refrigerant into the atmosphere.

• 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 (140 PSIG). Do not use R-404A as a mixture with

pressurized air for leak testing.

NOTICE

• Do not leave the system open for longer than 15 minutes when replacing or

servicing parts. The Polyol Ester (POE) oils used in R-404A appliances can

absorb moisture quickly. Therefore it is important to prevent moisture from

entering the system when replacing or servicing parts.

• Always install a new drier every time the sealed refrigeration system is opened.

• Do not replace the drier until after all other repair or replacement has been made.

Install the new drier 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).

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1. Refrigerant Recovery

The appliance is provided with refrigerant access valves. Using proper refrigerant

practices, recover the refrigerant from the access valves and store it in an approved

container. Do not discharge the refrigerant into the atmosphere.

2. Brazing

WARNING

• R-404A itself is not ﬂammable at atmospheric pressure and temperatures up to

176°F (80°C).

• R-404A itself is not explosive or poisonous. However, when exposed to high

temperatures (open ﬂames), R-404A can be decomposed to form hydroﬂuoric

acid and carbonyl ﬂuoride both of which are hazardous.

• Do not use silver alloy or copper alloy containing arsenic.

1) Braze all ﬁttings while purging with nitrogen gas ﬂowing at a pressure of 3 to 4 PSIG.

NOTICE

• Always install a new drier every time the sealed refrigeration system is opened.

• Do not replace the drier until after all other repair or replacement has been made.

Install the new drier 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 (140 PSIG). WARNING! Do not use R-404A as a mixture

with pressurized air for leak testing.

3. Evacuation and Recharge (R-404A)

1) Attach a vacuum pump to the system. Be sure to connect charging hoses to both high

and low-side access valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current

refrigerants. However, the rubber hose and gauge manifold to be used for

evacuation and refrigerant charge should be exclusively for POE oils.

2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the

vacuum pump to ﬂow backwards.

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends

on pump capacity.

4) Close the low-side valve and high-side valve on the gauge manifold.

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5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a

refrigerant service cylinder. Remember to loosen the connection and purge the air from

the hose. See the nameplate inside the appliance for the required refrigerant charge.

Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets

ARI Standard 700 (latest edition) be used.

6) A liquid charge is required for charging an R-404A system (to prevent fractionation).

Place the 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 valve or liquid

dispensing device to add the remaining liquid charge through the low-side

service valve with the appliance running.

9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold

hoses.

10) Cap the access valves to prevent a possible leak.

B. Important Notes for Component Replacement

NOTICE

When replacing a component listed below, see the notes to help ensure proper

operation. See Fig. 14.

Component

Notes

• Install a new drier, start capacitor, run capacitor, and start relay.

• Install a new drier.

Compressor

Thermostatic

Expansion Valve

• 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.

• Install a new fan motor capacitor.

Fan Motor

Evaporator Assembly Components. See Fig. 14.

Upper and

Lower Bearings

• Inspect the upper bearing for wear. See "IV.C.1. Upper Bearing Wear Check." Replace if

necessary.

• When replacing the upper bearing it is advised to also change the lower bearing at the

same time.

Evaporator

• Install a new drier.

• Inspect the mechanical seal and O-ring prior to installing the new evaporator. If worn,

cracked, or scratched, the mechanical seal should also be replaced.

Gear Motor

• Install a new gear motor capacitor.

Extruding Head • Extruding head allen head cap screws (with seals) are not reusable. New allen head cap

screws (with seals) must be used.

Bolts

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Evaporator Assembly

Spout B

Spout A

Power Switch

Cutter

Extruding Head and

Upper Bearing

Auger

4A1038-014

CONTROL

ICE

OFF

DISPENSE MODE

PORTION

Safety Switch

Evaporator Heater

Washer

DRAIN

CONTINUOUS

Allen Head Cap Screw (with seal)

Not reusable

Evaporator

Allen Head Cap Screw with Washer

Mechanical Seal

"O" Ring

Housing and Lower Bearing

Hex Head Bolt with Washer

Spline Coupling

Gear Motor

Fig. 14

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C. Icemaking Unit

1. Upper Bearing Wear Check

To ensure that the bearing inside the extruding head does not exceed the wear tolerance

of .02", follow the instructions below. See Fig. 15.

1) Move the control switch to the "OFF" position, then turn off the power supply. Remove

the front and top panels, then move the power switch to the "OFF" position.

2) Remove the storage bin cover. Remove spout B, then remove spout A and the cutter.

See Fig. 14.

.02" Round Stock

or Pin Gauge

3) Grasp the top of the auger and move the

auger towards you, then try to insert a

.02" round stock or pin gauge in between

the back side of the auger shaft and the

bearing surface. Check several locations

around the auger shaft. If the gauge goes

between the shaft and the bearing at

any point or if the bearing is scratched

or cracked, both the top bearing in the

extruding head and the lower bearing in the

housing should be replaced. Instructions

for removing the extruding head and

Auger

Extruding

Head

Fig. 15

housing are located later in this procedure.

Note: Replacing the bearing requires a bearing press adaptor. If one is not available,

replace the whole extruding head and housing.

4) Replace the cutter, spout A, spout B, and the storage bin cover in their correct positions.

5) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

6) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

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2. Removal and Replacement of Extruding Head

1) Move the control switch to the "DRAIN" position and drain all of the water from the

evaporator.

2) After the water has stopped draining, move the control switch to the "OFF" position, then

turn off the power supply. Remove the front and top panels, then move the power switch

to the "OFF" position.

3) Remove the storage bin cover. Remove spout B, then remove spout A and the cutter.

See Fig. 14.

4) Remove the apron panel, then remove the left side panel.

5) Remove the allen head cap screws (with seals) securing the extruding head and

discard. NOTICE! The allen head cap screws (with seals) are not reusable. New

allen head cap screws (with seals) must be used.

6) Lift off the extruding head.

7) Place the new extruding head in place and tighten down with new allen head cap

screws.

8) Replace the cutter in its correct position.

9) Replace spout A, spout B, and the storage bin cover in their correct positions.

10) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

11) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

3. Removal and Replacement of Auger

1) Move the control switch to the "DRAIN" position and drain all of the water from the

evaporator.

2) After the water has stopped draining, move the control switch to the "OFF" position, then

turn off the power supply. Remove the front and top panels, then move the power switch

to the "OFF" position.

3) Remove the storage bin cover. Remove spout B, then remove spout A. See Fig. 14.

4) Remove the apron panel, then remove the left side panel.

5) Remove the allen head cap screws (with seals) securing the extruding head and

discard. Using the cutter, lift out the auger assembly.

6) Remove the cutter, 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-ring or mechanical seal.

7) Install the new auger assembly with the upper part of the mechanical seal attached.

Secure the auger assembly using new allen head cap screws.

8) Replace spout A, spout B, and the storage bin cover in their correct positions.

9) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

10) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

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4. Removal and Replacement of Evaporator

NOTICE

• Always install a new drier every time the sealed refrigeration system is opened.

• Do not replace the drier until after all other repair or replacement has been made.

Install the new drier 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).

1) Move the control switch to the "DRAIN" position and drain all of the water from the

evaporator.

2) After the water has stopped draining, move the control switch to the "OFF" position, then

turn off the power supply. Remove the front and top panels, then move the power switch

to the "OFF" position.

3) Remove the apron panel, then remove the left side panel.

4) Recover the refrigerant and store it in an approved container.

5) Remove the storage bin cover. Remove spout B, then remove spout A. See Fig. 14.

6) Remove the extruding head heater and the allen head cap screws securing the

extruding head and discard the allen head cap screws. Using the cutter, lift out the

auger assembly.

7) Remove the evaporator bracket and disconnect the water hoses.

8) Disconnect the inlet and outlet tubing.

9) Remove the allen head cap screws securing the evaporator to the lower housing.

10) Lift off the evaporator.

11) Inspect the mechanical seal and O-ring prior to installing the new evaporator. The

mechanical seal consists of two parts. One moves along with the auger, and the other

is ﬁxed on the lower housing. NOTICE! If the contact surfaces of these two parts

are worn, cracked, or scratched, the mechanical seal may cause water leaks and

should be replaced. Instructions for removing the mechanical seal and lower housing

are located later in this procedure.

12) Make sure the lower mechanical seal is in place, then place the new evaporator in

position. Secure the evaporator to the lower housing using the allen head cap screws.

13) Remove the drier, then place the new drier in position.

14) Braze all ﬁttings while purging with nitrogen gas ﬂowing at a pressure of 3 to 4 PSIG.

15) 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 (140 PSIG). Do not use R-404A as a mixture with

pressurized air for leak testing.

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16) Evacuate the system, and charge it with refrigerant. See the nameplate for the required

refrigerant charge.

17) Install the new auger assembly with the upper part of the mechanical seal attached.

Secure the auger assembly using new allen head cap screws.

18) Replace the evaporator bracket and reconnect the water hoses.

19) Replace spout A, spout B, and the storage bin cover in their correct positions.

20) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

21) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

5. Removal and Replacement of Mechanical Seal and Lower Housing

5a. Mechanical Seal

1) Move the control switch to the "DRAIN" position and drain all of the water from the

evaporator.

2) After the water has stopped draining, move the control switch to the "OFF" position, then

turn off the power supply. Remove the front and top panels, then move the power switch

to the "OFF" position.

3) Remove storage bin cover. Remove spout B, then remove spout A. See Fig. 14.

4) Remove the apron panel, then remove the left side panel.

5) Remove the extruding head heater and the allen head cap screws securing the

extruding head and discard the allen head cap screws.

6) Using the cutter, lift out the auger assembly, then remove the evaporator bracket.

7) The mechanical seal consists of two parts. One moves along with the auger, and the

other is ﬁxed on the lower housing. NOTICE! If the contact surfaces of these two

parts are worn, cracked, or scratched, the mechanical seal may cause water leaks

and should be replaced.

8) Remove the allen head cap screws securing the evaporator to the lower housing.

9) Raise the evaporator up to access the lower housing.

10) Remove the mechanical seal from the housing. If only replacing the mechanical seal,

proceed to step 13. NOTICE! To help prevent water leaks, be careful not to damage

the surfaces of the O-ring or mechanical seal.

5b. Lower Housing

11) Remove the O-ring and the bolts securing the housing to the gear motor and remove

the housing from the gear motor. If inspection of the upper bearing inside the extruding

head (see "IV.C.1. Upper Bearing Wear Check") 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 housing.

12) Install the O-ring and mount the lower housing on the gear motor.

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13) Install the lower part of the mechanical seal on the lower housing.

14) Lower the evaporator down and secure it to the lower housing.

15) Install the auger assembly with the upper part of the mechanical seal attached. Secure

the auger assembly using new allen head cap screws.

16) Replace the evaporator bracket in its correct position.

17) Replace spout A, spout B, and the front cover of the storage bin in their correct

positions.

18) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

19) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

6. Removal and Replacement of Gear Motor

1) Move the control switch to the "DRAIN" position and drain all of the water from the

evaporator.

2) After the water has stopped draining, move the control switch to the "OFF" position, then

turn off the power supply. Remove the front and top panels, then move the power switch

to the "OFF" position.

3) Remove the storage bin cover. Remove spout B, then remove spout A. See Fig. 14.

4) Remove the apron panel, then remove the left side panel.

5) Remove the evaporator bracket.

6) Remove the bolts securing the lower housing to the gear motor. Lift the evaporator up

slightly.

7) Remove the 3 gear motor bolts.

8) Disconnect the wiring from the gear motor, then remove the gear motor.

9) Remove the spline coupling from the old gear motor and attach to the new gear motor.

10) Place the new gear motor in the drain pan.

11) Secure the gear motor.

12) Connect the gear motor wires.

13) Lower the evaporator down and secure it to the gear motor.

14) Replace the evaporator bracket in its correct position.

15) Replace spout A, spout B, and the front cover of the storage bin in their correct

positions.

16) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

17) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

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D. Dispense Components

1. Dispense Auger and Agitator

1) Move the control switch to the "OFF" position, then turn off the power supply. Remove

the front and top panels, then move the power switch to the "OFF" position.

2) Remove the storage bin cover.

3) Remove the thumbscrews from the vertical plane, then loosen the thumbscrews from

the horizontal plane of the motor bracket. Slide the motor back.

Note: Hold the dispense auger/agitator to prevent it from dropping when sliding back the

motor. See Fig. 16.

4) Replace the dispense auger/agitator with the new one.

5) Assemble the removed parts in the reverse order of which they were removed.

6) Move the power switch to the "ON" position, then replace the panels in their correct

positions.

7) Turn on the power supply, then move the control switch to the "ICE" position to start the

automatic icemaking process.

2. Dispense and Agitating Motors

1) Move the control switch to the "OFF" position, then turn off the power supply. Remove

the front and top panels, then move the power switch to the "OFF" position.

2) Remove the storage bin cover.

3) Remove the thumbscrews from the vertical plane, then loosen the thumbscrews from

the horizontal plane of the motor bracket. Slide the motor back.

Note: Hold the dispense auger/agitator to prevent it from dropping when sliding back the

motor. See Fig. 16.

4) Remove the thumbscrews from the horizontal plane of the motor bracket.

5) Remove the motor from the bracket.

6) Install the new motor.

7) Assemble the removed parts in the reverse order of which they were removed.

8) Move the power switch to the "ON" position,

Agitator

Agitating Motor

then replace the panels in their correct

positions.

9) Turn on the power supply, then move the

control switch to the "ICE" position to start

the automatic icemaking process.

Dispense Motor

Fig. 16

Dispense Auger

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V. Maintenance

The maintenance schedule below is a guideline. More frequent maintenance may be

required depending on water quality, the appliance's environment, and local sanitation

regulations.

WARNING

• Only qualiﬁed service technicians should service the appliance.

• Move the control switch and power switch to the "OFF" positions, then turn off the

power supply before servicing. Lockout/Tagout to prevent the power supply from

being turned back on inadvertently.

Maintenance Schedule

Frequency Area

Task

Every 2

Weeks

Air Filter

Inspect. Wash with warm water and neutral cleaner if dirty.

Monthly

External Water

Filters

Check for proper pressure and change if necessary.

Appliance Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a neutral

cleaner to wipe off oil or dirt build up. Clean any chlorine staining (rust

colored spots) using a non-abrasive cleaner.

Every 6

Months

Icemaker and

Storage Bin

Clean and sanitize per the cleaning and sanitizing instructions provided in

the instruction manual or maintenance label on the appliance.

Evaporator

Wipe down with a clean cloth and warm water. Dilute 0.82 ﬂ. oz. (25 ml) of a

Condensate Drain 5.25% sodium hypochlorite solution (chlorine bleach) with 1.6 gal. (6.0 l) of

Pan and Gear

Motor Drain Pan

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.

Icemaker, Storage Check to make sure they are clear.

Bin, and Drip Tray

Drains

Yearly

Inlet Water Valve

and Drain Valve

Close the water supply line shut-off valve and drain the water system. Clean

the inlet water valve screen and clean and inspect the drain valve.

Water Hoses

Condenser

Appliance

Inspect the water hoses and clean/replace if necessary.

Inspect. Clean if necessary by using a brush or vacuum cleaner.

Inspect for oil spots, loose components, fasteners, and wires.

Upper Bearing

(extruding head)

Check for wear using .02" round stock or pin gauge. Replace both upper

bearing and lower bearing if wear exceeds factory recommendations. See

"IV.C.1. Upper Bearing Wear Check".

After

3 Years,

then Yearly Lower Bearing

and O-Ring

Upper Bearing

(extruding head);

Inspect. Replace both upper bearing and lower bearing if wear exceeds

factory recommendations. Replace the mechanical seal if the seal's contact

surfaces are worn, cracked, or scratched.

(lower housing);

Mechanical

Seal; Evaporator

Cylinder; Auger

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VI. Preparing the Appliance for Periods of Non-Use

NOTICE

When storing the appliance for an extended time or in sub-freezing temperatures,

follow the instructions below to prevent damage.

When the appliance is not used for two or three days under normal conditions,

it is sufficient to only move the control switch to the "OFF" position. When

storing the appliance for extended time or in sub-freezing temperatures, follow

the instructions below.

1. Remove the ice from the storage bin, drain the water system, and remove the water

from the icemaker/water dispenser water supply line:

1) Close the icemaker water supply line shut-off valve and open the icemaker water supply

line drain valve.

2) Move the control switch to the "OFF" position, pause momentarily, then move to the

"DRAIN" position. Allow the water system to drain for 5 minutes.

Note: a) A momentary pause in the "OFF" position is necessary to de-energize the

control board when moving the control switch between "ICE" and "DRAIN."

Otherwise there is a delay of several minutes before the new selection takes

effect.

b) If the control switch is left in the "DRAIN" position for 10 minutes or more, a

2-beep alarm sounds every 5 seconds. Move the control switch out of the

"DRAIN" position to clear the alarm.

3) Move the dispense mode switch to the "CONTINUOUS" position, then dispense all of

the ice from the storage bin.

Note: Ice dispenses continuously for a maximum of 60 seconds per activation.

4) Attach 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 "OFF" position, pause momentarily, then move to the "ICE" position to open the inlet

water valve and brieﬂy blow out the inlet water valve. After blowing out the inlet water

valve, move the control switch to the "OFF" position.

6) Close the icemaker water supply line drain valve.

7) Turn off the power supply, then remove the front panel and move the power switch to the

"OFF" position.

8) Remove the storage bin cover. Clean the storage bin liner and the storage bin cover

using a neutral cleaner. Rinse thoroughly after cleaning. Replace the storage bin cover

and the front panel in their correct positions.

Note: If your unit has a water-cooled condenser, leave the front panel off and go to the

next section.

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2. On water-cooled model only, remove the water from the water-cooled condenser:

1) Make sure the control switch and the power switch are in the "OFF" position and that

the power supply is off. Remove the top, apron, and left side panels.

2) Close the condenser water supply line shut-off valve. If connected to a closed loop

system, also close the condenser return line shut-off valve.

3) Open the condenser water supply line drain valve. If connected to a closed loop system,

also open the condenser return line drain valve.

4) Attach a compressed air or carbon dioxide supply to the condenser water supply line

drain valve.

5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer

underneath the spring. While holding the valve open, blow out the condenser using the

compressed air or carbon dioxide supply until water stops coming out.

6) Close the drain valve(s).

7) Replace the panels in their correct positions..

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VII. Disposal

The 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.

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VIII.Technical Information

A. Speciﬁcation Sheets

1. DCM-751BAH

AC SUPPLY VOLTAGE

COMPRESSOR

GEAR MOTOR

115/60/1

115 V

120 V

115 V

20 A

Ambient

Temp.(°F)

77 LRA

3.0 FLA

1.0 FLA

1.8 FLA (TOTAL)

0.9 FLA

11.0 RLA

1/4 HP

50 W

110 W (TOTAL)

55 W

FAN MOTOR

AGITATING MOTOR

DISPENSING MOTOR

OTHER

MAXIMUM FUSE SIZE

MAX. HACR BREAKER (USA ONLY)

MAX. CIRC. BREAKER (CANADA ONLY)

MINIMUM CIRCUIT AMPACITY

APPROXIMATE ICE PRODUCTION

PER 24 HR.

0.6 A

WATER TEMP. (°F)

*801 (363) 757 (343)

695 (315) 666 (302)

725 (329)

639 (290)

lbs./day (kg/day)

Reference without *marks

100

612 (278) *583 (265) 562 (255)

539 (245) 517 (234) *490 (222)

SHAPE OF ICE

Cubelet

ICE HARDNESS FACTOR

APPROXIMATE STORAGE CAPACITY

ELECTRIC & WATER CONSUMPTION

ELECTRIC W (kWH/100 lbs.)

POTABLE WATER

90% (90/70°F, Conductivity 200 µs/cm)

95 lbs.

90/70°F

1388 (5.94)

70 (12.0)

70/50°F

1292 (4.08)

96 (12.0)

gal./24HR (gal./100 lbs.)

EXTERIOR DIMENSIONS (WxDxH)

EXTERIOR FINISH

WEIGHT

CONNECTIONS - ELECTRIC

- WATER SUPPLY

34-1/16" x 28-1/2" x 48-1/16" (865 x 723 x 1221 mm) (No legs)

Stainless Steel; Galvanized Steel (Rear)

Net 300 lbs. (136 kg), Shipping 345 lbs. (156 kg)

Permanent Connection

Inlet 1/2" FPT

- DRAIN

Drip Tray Drain Outlet 3/4" FPT

Storage Bin Drain Outlet 3/4" FPT

Auger Type

ICE MAKING SYSTEM

HARVESTING SYSTEM

ICE MAKING WATER CONTROL

DISPENSER CONTROL SYSTEM

BIN CONTROL SYSTEM

COMPRESSOR

Direct Driven Auger (1/4 HP Gear Motor)

Float Switch

Push Button

Mechanical Bin Control and Timer

Hermetic, Model RST61C1E-CFA-202

Air-Cooled, Fin and Tube Type

Copper Tube on Cylinder

CONDENSER

EVAPORATOR

REFRIGERANT CONTROL

REFRIGERANT CHARGE

DESIGN PRESSURE

P.C. BOARD CIRCUIT PROTECTION

COMPRESSOR PROTECTION

GEAR MOTOR PROTECTION

REFRIGERANT CIRCUIT PROTECTION

LOW WATER PROTECTION

ACCESSORIES - SUPPLIED

- OPTIONAL

Thermostatic Expansion Valve

R-404A, 1 lb. 10 oz. (737 g)

High 460 PSIG, Low 290 PSIG

High Voltage Power Protect Relay

Auto-Reset Internal Protector

Auto-Reset Internal Protector and Fuse (3A)

Auto-Reset High Pressure Switch

Float Switch and Timer

Spare Fuse (2-3A), Legs

HS-5003, Apron kit when drip tray removed

OPERATING CONDITIONS

VOLTAGE RANGE

AMBIENT TEMP.

WATER SUPPLY TEMP.

WATER SUPPLY PRESSURE

104-127 V

45-100° F

45-90° F

10-113 PSIG

Note: We reserve the right to make changes in speciﬁcations and design without prior

notice.

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2. DCM-751BAH-OS

AC SUPPLY VOLTAGE

COMPRESSOR

GEAR MOTOR

115/60/1

115 V

120 V

115 V

20 A

Ambient

Temp.(°F)

77 LRA

3.0 FLA

1.0 FLA

1.8 FLA (TOTAL)

0.9 FLA

11.0 RLA

1/4 HP

50 W

110 W (TOTAL)

55 W

FAN MOTOR

AGITATING MOTOR

DISPENSING MOTOR

OTHER

MAXIMUM FUSE SIZE

MAX. HACR BREAKER (USA ONLY)

MAX. CIRC. BREAKER (CANADA ONLY)

MINIMUM CIRCUIT AMPACITY

APPROXIMATE ICE PRODUCTION

PER 24 HR.

0.6 A

WATER TEMP. (°F)

*801 (363) 757 (343)

695 (315) 666 (302)

725 (329)

639 (290)

lbs./day (kg/day)

Reference without *marks

100

612 (278) *583 (265) 562 (255)

539 (245) 517 (234) *490 (222)

SHAPE OF ICE

Cubelet

ICE HARDNESS FACTOR

APPROXIMATE STORAGE CAPACITY

ELECTRIC & WATER CONSUMPTION

ELECTRIC W (kWH/100 lbs.)

POTABLE WATER

90% (90/70°F, Conductivity 200 µs/cm)

95 lbs.

90/70°F

1388 (5.94)

70 (12.0)

70/50°F

1292 (4.08)

96 (12.0)

gal./24HR (gal./100 lbs.)

EXTERIOR DIMENSIONS (WxDxH)

EXTERIOR FINISH

WEIGHT

CONNECTIONS - ELECTRIC

- WATER SUPPLY

34-1/16" x 28-1/2" x 48-1/16" (865 x 723 x 1221 mm) (No legs)

Stainless Steel; Galvanized Steel (Rear)

Net 300 lbs. ( 136 kg ), Shipping 345 lbs. ( 156 kg )

Permanent Connection

Inlet 1/2" FPT

- DRAIN

Drip Tray Drain Outlet 3/4" FPT

Storage Bin Drain Outlet 3/4" FPT

Auger Type

Direct Driven Auger (1/4 HP Gear Motor)

Float Switch

Photoelectric Sensor (Infrared)

Mechanical Bin Control and Timer

Hermetic, Model RST61C1E-CFA-202

Air-Cooled, Fin and Tube Type

Copper Tube on Cylinder

ICE MAKING SYSTEM

HARVESTING SYSTEM

ICE MAKING WATER CONTROL

DISPENSER CONTROL SYSTEM

BIN CONTROL SYSTEM

COMPRESSOR

CONDENSER

EVAPORATOR

REFRIGERANT CONTROL

REFRIGERANT CHARGE

DESIGN PRESSURE

Thermostatic Expansion Valve

R-404A, 1 lb. 10 oz. (737 g)

High 460 PSIG, Low 290 PSIG

CONTROL BOARD CIRCUIT PROTECTION High Voltage Power Protect Relay

COMPRESSOR PROTECTION

GEAR MOTOR PROTECTION

REFRIGERANT CIRCUIT PROTECTION

LOW WATER PROTECTION

ACCESSORIES - SUPPLIED

- OPTIONAL

Auto-Reset Internal Protector

Auto-Reset Internal Protector and Fuse (3A)

Auto-Reset High Pressure Switch

Float Switch and Timer

Spare Fuse (2-3A), Legs

HS-5002, Apron kit when drip tray removed

OPERATING CONDITIONS

VOLTAGE RANGE

104-127VAC

AMBIENT TEMP.

WATER SUPPLY TEMP.

WATER SUPPLY PRESSURE

45-100°F

45-90°F

10-113 PSIG

Note: We reserve the right to make changes in speciﬁcations and design without prior

notice.

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3. DCM-751BWH

AC SUPPLY VOLTAGE

COMPRESSOR

GEAR MOTOR

AGITATING MOTOR

DISPENSING MOTOR

OTHER

MAXIMUM FUSE SIZE

MAX. HACR BREAKER (USA ONLY)

MAX. CIRC. BREAKER (CANADA ONLY)

MINIMUM CIRCUIT AMPACITY

APPROXIMATE ICE PRODUCTION

PER 24 HR.

115/60/1

115 V

120 V

115 V

20 A

77 LRA

3.0 FLA

1.8 FLA (TOTAL)

0.9 FLA

0.6 A

11.0 RLA

1/4 HP

110 W (TOTAL)

55 W

Ambient

Temp.(°F)

WATER TEMP. (°F)

*800 (363) 779 (353)

738 (335) 719 (326)

758 (344)

700 (317)

lb./day (kg/day)

Reference without *marks

100

681 (309) *685 (311) 646 (293)

629 (285) 612 (278) *563 (255)

SHAPE OF ICE

Cubelet

ICE HARDNESS FACTOR

APPROXIMATE STORAGE CAPACITY

ELECTRIC & WATER CONSUMPTION

ELECTRIC W (kWH/100 lb.)

POTABLE WATER

WATER-COOLED CONDENSER

gal./24HR (gal./100 lb.)

EXTERIOR DIMENSIONS (WxDxH)

EXTERIOR FINISH

90% (90/70°F, Conductivity 200 µs/cm)

95 lb.

90/70°F

1281 (4.77)

82 (12.0)

517 (76)

70/50°F

1274 (3.86)

96 (12.0)

380 (47)

34-1/16" x 28-1/2" x 48-1/16" (865 x 723 x 1221 mm) (No legs)

Stainless Steel; Galvanized Steel (Rear)

Net 300 lb. (136 kg), Shipping 345 lb. (156 kg)

Permanent Connection

WEIGHT

CONNECTIONS - ELECTRIC

- WATER SUPPLY

Inlet 1/2" FPT

Condenser Inlet 1/2" FPT

Condenser Outlet 3/8" FPT

- DRAIN

Drip Tray Drain Outlet 3/4" FPT

Storage Bin Drain Outlet 3/4" FPT

Auger Type

ICE MAKING SYSTEM

HARVESTING SYSTEM

ICE MAKING WATER CONTROL

DISPENSER CONTROL SYSTEM

COOLING WATER CONTROL

BIN CONTROL SYSTEM

COMPRESSOR

Direct Driven Auger (1/4 HP Gear Motor)

Float Switch

Push Button

Water Regulating Valve

Mechanical Bin Control and Timer

Hermetic, Model RST61C1E-CFA-202

Water Cooled, Tube in Tube Type

Copper Tube on Cylinder

CONDENSER

EVAPORATOR

REFRIGERANT CONTROL

REFRIGERANT CHARGE

DESIGN PRESSURE

P.C. BOARD CIRCUIT PROTECTION

COMPRESSOR PROTECTION

GEAR MOTOR PROTECTION

REFRIGERANT CIRCUIT PROTECTION

LOW WATER PROTECTION

ACCESSORIES - SUPPLIED

- OPTIONAL

Thermostatic Expansion Valve

R-404A, 1 lb. 6 oz. (624 g)

High 460 PSIG, Low 290 PSIG

High Voltage Power Protect Relay

Auto-Reset Internal Protector

Auto-Reset Internal Protector and Fuse (3A)

Auto-Reset High Pressure Switch

Float Switch and Timer

Spare Fuse (2-3A), Legs

HS-5003, Apron kit when drip tray removed

OPERATING CONDITIONS

VOLTAGE RANGE

104-127 VAC

AMBIENT TEMP.

WATER SUPPLY TEMP.

WATER SUPPLY PRESSURE

45-100° F

45-90° F

10-113 PSIG

Note: We reserve the right to make changes in speciﬁcations and design without prior

notice.

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4. DCM-751BWH-OS

AC SUPPLY VOLTAGE

COMPRESSOR

GEAR MOTOR

AGITATING MOTOR

DISPENSING MOTOR

OTHER

MAXIMUM FUSE SIZE

MAX. HACR BREAKER (USA ONLY)

MAX. CIRC. BREAKER (CANADA ONLY)

MINIMUM CIRCUIT AMPACITY

APPROXIMATE ICE PRODUCTION

PER 24 HR.

115/60/1

115 V

120 V

115 V

20 A

77 LRA

3.0 FLA

1.8 FLA (TOTAL)

0.9 FLA

0.6 A

11.0 RLA

1/4 HP

110 W (TOTAL)

55 W

Ambient

Temp.(°F)

WATER TEMP. (°F)

*800 (363) 779 (353)

738 (335) 719 (326)

758 (344)

700 (317)

lb./day (kg/day)

Reference without *marks

100

681 (309) *685 (311) 646 (293)

629 (285) 612 (278) *563 (255)

SHAPE OF ICE

Cubelet

ICE HARDNESS FACTOR

APPROXIMATE STORAGE CAPACITY

ELECTRIC & WATER CONSUMPTION

ELECTRIC W (kWH/100 lb.)

POTABLE WATER

WATER-COOLED CONDENSER

gal./24HR (gal./100 lb.)

EXTERIOR DIMENSIONS (WxDxH)

EXTERIOR FINISH

90% (90/70°F, Conductivity 200 µs/cm)

95 lb.

90/70°F

1281 (4.77)

82 (12.0)

517 (76)

70/50°F

1274 (3.86)

96 (12.0)

380 (47)

34-1/16" x 28-1/2" x 48-1/16" (865 x 723 x 1221 mm) (No legs)

Stainless Steel; Galvanized Steel (Rear)

Net 300 lb. (136 kg), Shipping 345 lb. (156 kg)

Permanent Connection

WEIGHT

CONNECTIONS - ELECTRIC

- WATER SUPPLY

Inlet 1/2" FPT

Condenser Inlet 1/2" FPT

Condenser Outlet 3/8" FPT

- DRAIN

Drip Tray Drain Outlet 3/4" FPT

Storage Bin Drain Outlet 3/4" FPT

Auger Type

ICE MAKING SYSTEM

HARVESTING SYSTEM

ICE MAKING WATER CONTROL

DISPENSER CONTROL SYSTEM

COOLING WATER CONTROL

BIN CONTROL SYSTEM

COMPRESSOR

Direct Driven Auger (1/4 HP Gear Motor)

Float Switch

Photoelectric Sensor (Infrared)

Water Regulating Valve

Mechanical Bin Control and Timer

Hermetic, Model RST61C1E-CFA-202

Water Cooled, Tube in Tube Type

Copper Tube on Cylinder

CONDENSER

EVAPORATOR

REFRIGERANT CONTROL

REFRIGERANT CHARGE

DESIGN PRESSURE

P.C. BOARD CIRCUIT PROTECTION

COMPRESSOR PROTECTION

GEAR MOTOR PROTECTION

REFRIGERANT CIRCUIT PROTECTION

LOW WATER PROTECTION

ACCESSORIES - SUPPLIED

- OPTIONAL

Thermostatic Expansion Valve

R-404A, 1 lb. 6 oz. (624 g)

High 460 PSIG, Low 290 PSIG

High Voltage Power Protect Relay

Auto-Reset Internal Protector

Auto-Reset Internal Protector and Fuse (3A)

Auto-reset High Pressure Switch

Float Switch and Timer

Spare Fuse (2-3A), Legs

HS-5002, Apron kit when drip tray removed

OPERATING CONDITIONS

VOLTAGE RANGE

104-127 VAC

AMBIENT TEMP.

WATER SUPPLY TEMP.

WATER SUPPLY PRESSURE

45-100° F

45-90° F

10-113 PSIG

Note: We reserve the right to make changes in speciﬁcations and design without prior

notice.

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B. Performance Data

1. DCM-751BAH(-OS)

APPROXIMATE

ICE PRODUCTION

PER 24 HR.

Ambient

Water Temp. (°F)

Temp. (°F)

801

695

612

539

1292

1333

1374

1414

363

315

278

245

757

666

583

517

1306

1347

1388

1426

343

302

265

234

725

639

562

490

1319

1361

1401

1439

329

290

255

222

lb./day kg/day

100

APPROXIMATE ELECTRIC

CONSUMPTION

watts

100

APPROXIMATE WATER

CONSUMPTION PER 24 HR.

364

316

278

245

344

303

265

235

330

290

256

223

gal./day l/day

100

EVAPORATOR OUTLET TEMP.

-10

-8

-10

-8

-10

-8

-7

°F °C

100

217

253

289

327

-7

217

253

289

327

-7

217

253

289

327

-7

HEAD PRESSURE

15.3

17.8

20.3

23.0

2.2

15.3

17.8

20.3

23.0

2.2

15.3

17.8

20.3

23.0

2.2

PSIG kg/cm²G

100

SUCTION PRESSURE

2.4

2.5

PSIG kg/cm²G

100

2.7

TOTAL HEAT OF REJECTION

9,300 BTU/h (AT 90°F /WT 70°F)

Note:

1. The data not in bold should be used for reference only.

2. We reserve the right to make changes in speciﬁcations and design without prior

notice.

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2. DCM-751BWH(-OS)

APPROXIMATE

ICE PRODUCTION

PER 24 HR.

Ambient

Water Temp. (°F)

Temp. (°F)

800

738

363

335

309

285

779

719

353

326

311

278

758

700

344

317

293

255

681

685

646

lb./day kg/day

100

629

612

563

APPROXIMATE ELECTRIC

CONSUMPTION

1274

1277

1280

1286

474

1275

1278

1281

1289

513

1276

1279

1284

1291

686

watts

100

APPROXIMATE WATER

CONSUMPTION PER 24 HR.

1.79

1.91

1.94

2.36

1.94

2.14

2.31

2.49

2.60

3.04

3.11

3.86

504

565

804

513

609

823

gal./day l/day

100

623

659

1019

EVAPORATOR OUTLET TEMP.

-11

-10

°F °C

100

258

259

260

257

-10

18.1

18.2

18.3

18.1

2.3

258

259

260

257

-10

18.1

18.2

18.3

18.1

2.3

258

259

260

257

-10

18.1

18.2

18.3

18.1

2.3

HEAD PRESSURE

PSIG kg/cm²G

100

SUCTION PRESSURE

2.3

PSIG kg/cm²G

100

2.4

WATER FLOW FOR CONDENSER

20gal/h (AT 90°F /WT 70°F)

Less than 7 PSIG

PRESSURE DROP OF COOLING WATER LINE

HEAT OF REJECTION FROM CONDENSER

HEAT OF REJECTION FROM COMPRESSOR

HEAT OF REJECTION FROM GEAR MOTOR

8,100 BTU/h (AT 90°F /WT 70°F)

1,300 BTU/h (AT 90°F /WT 70°F)

700 BTU/h (AT 90°F /WT 70°F)

Note:

1. The data not in bold should be used for reference only.

2. We reserve the right to make changes in speciﬁcations and design without prior

notice.

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C. Wiring Diagrams

1. DCM-751B_H

* High Pressure Switch

Air-Cooled Model Water-Cooled Model

412 ²¹PSIG

384 ²¹PSIG

Cut-out

Cut-in

327 21 PSIG

284 21 PSIG

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2. DCM-751B_H-OS

* High Pressure Switch

Air-Cooled Model Water-Cooled Model

412 ²¹PSIG

384 ²¹PSIG

Cut-out

Cut-in

327 21 PSIG

284 21 PSIG

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