Hoshizaki AM-50BAE-DS, AM-50BAE-AD, AM-50BAE-ADDS, AM-50BAE User Manual

Hoshizaki America, Inc.

Hoshizaki

Self-Contained Cuber

Models
AM-50BAE
AM-50BAE-DS

“A Superior Degree

of Reliability”

www.hoshizaki.com

AM-50BAE-AD
AM-50BAE-ADDS

SERVICE MANUAL

Number: 73126
Issued: 12-22-2004
Revised: 5-23-2013

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

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

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this 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 ................................................................................................. 4

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

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

B. Water/Refrigeration Circuit Diagram .............................................................................. 8

II. Sequence of Operation and Service Diagnosis ................................................................. 9

A. Sequence of Operation Flow Chart ............................................................................... 9

B. Service Diagnosis ....................................................................................................... 10

1. Diagnostic Procedure: Auxiliary Code C-0 and Earlier ............................................11

2. Diagnostic Procedure: Auxiliary Code C-1 and Later ............................................. 14

C. Bin Control Check ....................................................................................................... 17

D. Thermistor Check ........................................................................................................ 18

E. Diagnostic Tables ........................................................................................................ 19

III. Control Board .................................................................................................................. 22

A. Control Board Layout .................................................................................................. 23

1. Auxiliary Code C-0 and Earlier ............................................................................... 23

2. Auxiliary Code C-1 and Later ................................................................................. 24

B. Settings and Adjustments ............................................................................................ 25

C. LED Lights Auxiliary Code C-1 and Later .................................................................... 26

D. Control Switch ............................................................................................................. 26

IV. Refrigeration Circuit and Component Service Information.............................................. 27

A. Refrigeration Circuit Service Information .................................................................... 27

B. Component Service Information .................................................................................. 29

V. Maintenance .................................................................................................................... 30

A. Maintenance Schedule ................................................................................................ 30

B. Optional Drain Pump HS-0248 or HS-5061 ................................................................ 31

VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 33

VII. Disposal ......................................................................................................................... 34

VIII. Technical Information .................................................................................................... 35

A. Specication and Performance Data ........................................................................... 35

B. Wiring Diagrams .......................................................................................................... 36

1. Auxiliary Code C-0 and Earlier ............................................................................... 36

2. Auxiliary Code C-1 and Later ................................................................................. 37

3. HS-0248 and HS-5061 Optional Drain Pump ........................................................ 38

3

Important Safety Information

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

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resultingfrom
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.

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

• Only qualied service technicians should install and service the appliance.

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

local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage.

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

damp hands.

• Make sure the control switch is in the "OFF" position before plugging in or

unplugging the appliance.

• Before servicing, move the control switch to the "OFF" position. Unplug the

appliance from the electrical outlet.

• The appliance requires an independent power supply of proper capacity. See the

nameplate for electrical specications. 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 re.

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

• The GREEN ground wire in the factory-installed power cord is connected to the

appliance. If it becomes necessary to remove or replace the power cord, be sure
to connect the power cord's ground wire.

4

WARNING, continued

• Do not make any alterations to the appliance. Alterations could result in electric

shock, serious injury, re, or damage.

• Do not use an extension cord.

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

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

• This 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.

• Children should be properly supervised around this appliance.

• Do not climb, stand, or hang on the appliance or appliance door or allow children or

animals to do so. Do not climb into the appliance or allow children or animals to do
so. Death or serious injury could occur or the appliance could be damaged.

• Be careful not to pinch ngers when opening and closing the door. Be careful when

opening and closing the door when children are in the area.

• Open and close the door with care. Door opened too quickly or forcefully may

cause injury or damage to the appliance or surrounding equipment.

• Do not use combustible spray or place volatile or ammable substances near the

appliance They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance

could cause harm to individuals or damage to the appliance.

• Do not place anything on top of the appliance. Foreign objects or moisture could

enter the appliance and result in electric shock or re.

5

NOTICE

• Protect the oor when moving the appliance to prevent damage to the oor.

• When making water supply or drain line repairs, follow the requirements found in the

instruction manual to reduce the risk of costly water damage.

• In areas where water damage is a concern, conrm appliance is installed in a
contained area with a oor drain.

• Conrm the appliance is in a location that stays above freezing. Normal operating

ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• If using the optional drain pump (HS-0248 or HS-5061), test its operation every time
the appliance is cleaned and sanitized. See "V.B. Optional Drain Pump HS-0248
or HS-5061" for details. If the optional drain pump is not operating properly or not
primed properly (HS-0248), water could back up and overow, leading to costly

water damage.

• If water collects in the bin and will not drain, turn off the appliance and close the

water supply line shut-off valve.

• If water seeps from the base of the appliance, turn off the appliance and close the

water supply line shut-off valve. Failure to do so could lead to costly water damage.

• Do not leave the appliance on during extended periods of non-use, extended

absences, or in sub-freezing temperatures. To properly prepare the appliance for

these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."

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

bin.

6

I. Construction and Water/Refrigeration Circuit Diagram

A. Construction

Top Panel

Ice Making
Mechanism

Scoop Holder

Slope

Bin Control
Thermostat
Bulb

Magnet
Catch

Front Panel

Control Switch

Power Cord

Door

Louver

7

B. Water/Refrigeration Circuit Diagram

Capillary Tube

Accumulator

Pump
Motor

To Drain

Inlet Water Valve

Evaporator

Thermistor

Ice Chute

Spray Assembly

Water Tank

Ice Storage Bin

Heat Exchanger

Hot Gas
Valve

Condenser

Compressor

Fan

Drier

Strainer

Water Circuit

Refrigeration Circuit

8

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

5-min. FTT

incontrol

If thermistor stays

below 27°F (-3°C),

3-min. freeze timer

terminates and

5-min FTT starts.

Otherwise, 3-min. FT

restarts.

3-min. FT

incontrol

Thermistor drops to

27°F (-3°C)

(6.8 kΩ or more).

3-min. FT starts.

BCH continues

Comp continues

FM energized

PM energized

HGV de-energized

WV de-energized

4. Normal Freeze Cycle

27°F (-3°C) during 3-min. FT.

Thermistor

50-sec.

in control

HT in

control

• 3-min. FT resets if temperature rises above

Legend:

BC–bin control

BCH–bin control heater

Comp–compressor

DP–drain pump (optional)

FM–fan motor

FT–freeze timer

FTT–freeze termination timer

To 1 above

HGV–hot gas valve

HT–harvest timer

PM–pump motor

WV–inlet water valve

WVT–inlet water valve timer

No ice touching

thermostatic bulb.

Icemaker starts at

length of harvest, whichever

3. Normal Harvest Cycle

• WV time: 102 sec. or the

is shorter.

Thermistor

in control

102-sec.

WVT

5-min. FTT

incontrol

Thermistor temperature

reaches 45°F (7°C)

(4.5 kΩ or less).

50 sec. HT starts.

BCH continues

Comp continues

FM de-energized

PM de-energized

HGV energized

3. Ice Level Lowered

WV energized

2. Icemaker Off

If thermistor stays

below 27°F (-3°C),

3-min. freeze timer

terminates and

5-min FTT starts.

Otherwise, 3-min. FT

restarts.

AM-50BAE Series Sequence Flow Chart

• WV continues for 52 sec. during initial freeze.

2. Initial Freeze Cycle

Harvest

3-min. FT

incontrol

Thermistor drops to

27°F (-3°C)

(6.8 kΩ or more).

3-min. FT starts.

27°F (-3°C) during 3-min. FT.

Thermistor

• 3-min. FT resets if temperature rises above

Cycle

in control

52-sec.

50-sec.

HT

102-sec.

WVT

WV de-energized

BCH continues

Comp continues

FM energized

PM energized

HGV de-energized

1. Bin Full

1. Initial

"1. Initial Harvest Cycle."

BC closed

All components

de-energized.

BC open

All components

de-energized except

BCH and DP

Within 10 sec. after ice

contacts thermostatic

bulb, appliance shuts

down.

Ice contacts

thermostatic bulb

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH" position,

power is supplied to the pump motor and fan motor. The cleaner and sanitizer ow over the evaporator plate assembly.

BC Operation

Cycle Steps

Startup

BCH energized

Comp energized

HGV energized

WV energized

Shutdown andRestart

9

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service

personnel to reduce the risk of death, electric shock, serious injury, or re.

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

• Risk of electric shock. Control switch in "OFF" position does not de-energize all

loads (optional drain pump).

• 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 ice storage bin.

• Make sure all food zones in the appliance are clean after service.

The 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 nameplate, and adequate water supply.

Note: • When checking high-voltage (115VAC), always choose a white (W) neutral wire to

establish a good neutral connection.

• When checking low-voltage (24VAC) (auxiliary code C-1 and later), always

choose a light blue (LBU) neutral wire to establish a good neutral connection.

• When checking component voltage from CB, pull CB connectors out slightly to

allow room for multimeter test leads contact.

• BCH energizes at startup and continues until the control switch is turned off or

power is disconnected.

• Optional drain pump (HS-0248 or HS-5061) has 115VAC power supply as soon

as the appliance is plugged into the electrical outlet.

1) Access the control box and move the control switch to the "OFF" position.

2) Clear any ice from BC.

10

1. Diagnostic Procedure: Auxiliary Code C-0 and Earlier

3) Power On/Initial Harvest Cycle. Move the control switch to the "ICE" position. Comp,
HGV, and WV energize. Initial harvest cycle starts. 50-sec. HT and 102-sec. WVT start.

a) Power On Diagnosis: If Comp, HGV, and WV do not energize, conrm appliance is

plugged into electrical outlet. If optional drain pump HS-0248 or HS-5061 is installed,
conrm the water level in the drain pump reservoir is not high enough to close the
drain pump safety switch. When the water level lowers enough to open the drain

pump upper oat switch, power is restored to the icemaker. The pump motor remains
energized as long as the drain pump lower oat switch is closed. Ifoptional drain

pump is not installed, check that jumper connection is good. Next, check for 115VAC
at control switch #2(BR) to neutral (W) then at control switch #1(O) to neutral (W).
If115VAC is present at #2 (BR) to neutral (W) and not at #1(O) to neutral (W),
replace control switch. Check BC continuity. If open, warm BC thermostat bulb with

hand. See"II.D. Bin Control Check." If BC does not close, replace BC. If BC is closed

and HGV or WV is not energized, check for 115VAC at CB U (BK) to CB V (W). If

115VAC is not present, check wiring. If115VAC is present, see "d) HGV Diagnosis"
or "e) WV Diagnosis" below.

b) BCH Diagnosis: If BCH does not energize, check BCH continuity. If open, replace

BCH.

c) Comp Diagnosis: If Comp does not energize, check PTC relay continuity. If open,

replace PTC. If closed, check Comp external protector and motor winding continuity.
Replace as needed.

d) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

HGV energizes and opens. If not, check for 115VAC at CB C1 (BK) to neutral (W)
and at CB B1 (P) to neutral (W). If 115VAC is present at CB C1 (BK) to neutral (W)
and not at CB B1 (P) to neutral (W), replace CB. If 115VAC is not present at CB
C1(BK), check wiring connections from BC. If 115VAC is present, check HGV coil
continuity. Replace as needed.

e) WV Diagnosis: Check that water enters the water tank. If not, check that the water

supply line shut-off valve is open and screens or external lters are clear. Check for
115VAC at CB C2 (BK) to neutral (W) and CB A2 (V) to neutral (W). If115VAC is not
present at CB C2 (BK), check wiring from BC. If 115VAC is present at CB C2 (BK)
to neutral (W) and not at CB A2 (V) to neutral (W), replace CB. If 115VAC is present
and WV does not energize, check WV coil continuity. Ifopen, replace WV.

f) Initial Harvest Cycle Termination Diagnosis: 50-sec. HT terminates and freeze

cycle starts. If not, replace CB.

11

4) Initial Freeze Cycle. Comp and 102-sec. WVT (WV continues another 52sec.in
freeze cycle) continue. FM and PM energize. HGV de-energizes. When 102-sec.
WVT terminates, WVde-energizes. CB monitors the cooling of the evaporator via the
thermistor located on the evaporator for freeze termination. When the thermistor drops
to 27°F (-3°C), CB reads 6.8 kΩ from the thermistor and starts 3-min. FT. 27°F (-3°C)
or lower must be maintained the entire 3min. If reading rises above 27°F(-3°C) before
3-min. FT terminates, 3-min. FT resets. When 27°F(-3°C) or lower is maintained for 3
min., 5-min. FTT starts.

a) Comp Diagnosis: If Comp de-energizes, check PTC relay continuity. If open,

replace PTC. If closed, check Comp external protector and motor winding continuity.
Replace as needed. If Comp is energized but evaporator is not cooling, check for an

inefficient Comp. See "VIII.B. Performance Data."

b) FM and PM Diagnosis: If FM and PM do not energize, check for 115VAC at CB

B1(P) to neutral (W) and CB A1 (LBU) to neutral (W). If115VAC is present at CB
B1(P) to neutral (W) and not at CB A1 (LBU) to neutral (W), replace CB. If115VAC is
present at CB A1 (LBU) to neutral (W), check FM or PM motor winding continuity, fan
blade or PM impeller for binding, and PM capacitor.

c) HGV and WV Diagnosis: Conrm HGV and WV de-energize. If HGV is energized,

check for 115VAC at CB B1 (P) to neutral(W). If 115VAC is present after PM
energizes, replace CB. If 115VAC is not present and HGV is bypassing, replace HGV.
If WV does not de-energize 52 sec. after freeze cycle starts, check for 115VAC at
CB A2 (V) to neutral (W). If 115VAC is present 52 sec. or later after PM energizes,
replace CB. If115VAC is not present and WV is leaking by, replace WV.

d) Initial Freeze Cycle Termination Diagnosis: 5-min. FTT terminates, harvest cycle

starts. Ifnot, check evaporator temperature where thermistor is mounted and check

the thermistor. See "II.E. Thermistor Check." If evaporator temperature is below

27°F(-3°C) for more than 8min. and freeze does not terminate, replace CB.

5) Normal Harvest Cycle. Comp continues. HGV and WV energize. FMand PM
de-energize. 102-sec. WV timer starts. CB monitors the warming of the evaporator via
the thermistor located on the evaporator. When the thermistor reaches 47°F (7°C), CB
reads 4.5 kΩ from the thermistor and turns harvest termination over to the 50-sec. HT.
WV is energized during harvest for a maximum of 102 sec. or the length of harvest,
whichever is shorter.
Note: Appliance continues to cycle until BC is satised or power is turned off.

Theappliance always restarts at the initial harvest cycle.

a) Comp Diagnosis: Check that evaporator is warming. Ifnot, conrm Comp is

energized. If not, check for 115VAC at PTC and check PTC relay continuity. If open,
replace PTC. If closed, check Comp external protector and motor winding continuity.
Replace as needed.

b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

HGV energizes and opens. If not, check for 115VAC at CB C1 (BK) to neutral (W)
and at CB B1 (P) to neutral (W). If 115VAC is present at CB C1 (BK) to neutral (W)
and not at CB B1 (P) to neutral (W), replace CB. If 115VAC is not present at CB
C1(BK) to neutral (W), check wiring connections from BC. If 115VAC is present,
check HGV coil continuity. Replace as needed.

12