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

c) 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) to neutral (W), 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.

d) FM and PM Diagnosis: Conrm FM and PM de-energize. If not, check for 115VAC at

CB A1 (LBU) to neutral(W) and CB B1 (P) to neutral (W). If 115VAC is present at CB
A1 (LBU) and not at CB B1 (P), CB is still in freeze cycle or CB X1 relay is sticking.
Replace as needed.

e) Normal Harvest Cycle Termination Diagnosis: Fora thermistor check, see

"II.D.Thermistor Check." If evaporator is warming, thermistor reading is correct, and

harvest does not terminate, replace CB.

6) Normal Freeze Cycle. Comp continues. FM and PM energize. HGV and WV
de-energize. 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 is energized, check for 115VAC at CB A2 (V) to neutral (W). If 115VAC is
present, replace CB. If115VAC is not present and WV is leaking by, replace WV.

d) Normal 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.

7) Shutdown. When the appliance is running, hold ice in contact with the thermostatic
bulb. BC switch opens within 10 sec., shutting down the appliance. BC is factory set
and generally no adjustment is required. However, adjustment may be needed in
some conditions, particularly at higher altitude locations.

Legend: BC–bin control; CB–control board; Comp–compressor; FM–fan motor; FT–freeze

timer; FTT–freeze termination timer; HGV–hot gas valve; HT–harvest timer;
PM–pump motor; WV–inlet water valve; WVT–inlet water valve timer

13

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

3) Power On/Initial Harvest Cycle – LED 1 is ashing and LED 3 is on. Movethe

control switch to the "ICE" position. LEDs 1 (green), 3 (green), and 4 (orange) turn on
briey then turn off. Then LED 1 starts ashing, LED 3 turns on and Comp, HGV, and

WV energize. Initial harvest cycle starts. 50-sec. HT and 102-sec. WVT start.

Note: 24VAC to CB is conrmed with a ashing LED 1.

a) Power On Diagnosis: Conrm green LED 1 is ashing. Ifnot, 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(BR) to neutral (W).
If115VAC is present at #2 (BR) to neutral (W) and not at #1(BR) 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 LED 1 is not ashing, check for 115VAC primary voltage and 24VAC secondary

voltage at CT. If 115VAC is present and 24VAC is not, replace CT. If 24VAC is
present, check for 24VAC at CB B (R) to CB W (LBU). If 24VAC is not present, check

low-voltage wiring. If 24VAC is present and LED 1 is not on and ashing, replace CB.

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

e) WV Diagnosis: Conrm LED 3 is on. If not, replace CB. If LED 3 is on, 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 (BR) to
neutral (W) and CB A2 (O) to neutral (W). If115VAC is not present at CB C2 (BR) to
neutral (W), check wiring from BC. If 115VAC is present at CB C2 (BR) to neutral (W)
and not at CB A2 (O) 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.

14

4) Initial Freeze Cycle – LED 1 is ashing and LEDs 3 and 2 are on. 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, LED 3 turns off and
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, the 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 at CB A1 (DBU) to neutral (W). If 115VAC is present at CB
B1(P) to neutral (W) and not at CB A1 (DBU) to neutral (W), replace CB.
If 115VAC is present at CB A1 (DBU) 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 LED 3 does not turn off and WV does not de-energize 52 sec. after freeze cycle
starts, check for 115VAC at CB A2 (O) 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 – LED 1 is ashing and LED 3 is on. 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.

15

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

c) WV Diagnosis: Conrm LED 3 is on. If not, replace CB. If LED 3 is on, 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 (BR) to
neutral (W) and CB A2 (O) to neutral (W). If 115VAC is not present at CB C2 (BR) to
neutral (W), check wiring from BC. If 115VAC is present at CB C2 (BR) to neutral (W)
and not at CB A2 (O) to neutral (W), replace CB. If 115VAC is present and WV does
not energize, check WV coil continuity. If open, replace WV.

d) FM and PM Diagnosis: If FM and PM continue after LED 2 turns off, replace CB.

e) Normal Harvest Cycle Termination Diagnosis: Fora thermistor check, see

"II.D.Thermistor Check." If evaporator is warming, thermistor reading is correct, and

harvest does not terminate, replace CB.

6) Normal Freeze Cycle – LED 1 is ashing and LED 2 is on. Comp continues. FM and
PM energize. HGV and WV de-energize. 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.A. Specication and 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 (DBU) to neutral (W). If 115VAC is present at CB
B1(P) to neutral (W) and not at CB A1 (DBU) to neutral (W), replace CB. FM-If
115VAC is present at CB A1 (DBU) to neutral (W), check FM or PM motor winding
continuity, fan blade or PM impellar 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 LED 3 is on after LED 2 turns on, replace CB. When LED 3 turns off, make sure
WV is not leaking by. If WV is leaking by, replace WV.

d) Normal 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.

16

7) Shutdown. When the appliance is running, hold ice in contact with the thermostatic
bulb. BC switch opens within 10 sec., shutting down the appliance. BC is factory set,
and generally no adjustment is required. However, adjustment may be needed in
some conditions, particularly at higher altitude locations.

Legend: BC–bin control; CB–control board; Comp–compressor; FM–fan motor; FT–freeze

timer; FTT–freeze termination timer; HGV–hot gas valve; HT–harvest timer;

PM–pump motor; WV–inlet water valve; WVT–inlet water valve timer

C. Bin Control Check

BC shuts down the icemaker within 10 sec. when ice contacts the thermostatic bulb,
regardless of the cycle at activation.

NOTICE

When the ambient temperature is below 45°F (7°C), BC opens and shuts down the
appliance even if the ice storage bin is empty.

To check BC, follow the steps below.

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

2) Unplug the appliance.

3) Remove the control box cover. Loosen the control box from the base and slide it out for
easy access. Next, clear any ice away from BC bulb.

4) Use the wiring diagram to locate the 2 wires supplied to BC. Disconnect BC wires.

5) Hold your hand around the bulb to warm it up.

6) Check for continuity across BC wires. If closed, continue to step 7. If open, replace BC.

7) With the multimeter test leads still in place, hold ice in contact with BC bulb. BC should
open within 10sec. If not, BC must be adjusted. Installations at higher altitude locations
are more likely to require adjustment. If BC will not shut down the appliance even after
being adjusted, replace BC.

Legend: BC–bin control

17

D. Thermistor Check

To check thermistor resistance, follow the steps below.

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

2) Unplug the appliance.

3) Remove the control box cover.

4) Remove the thermistor from the evaporator.

5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.

6) Disconnect the thermistor connector from CB and check the resistance between
thermistor leads. Normal range is 5.5 to 6.5 kΩ. If outside the normal range, replace

the thermistor. See "IV.B. Important Notes for Component Replacement." If within the

normal range, continue to the next step.

7) Replace the thermistor in its correct position. See "IV.B. Important Notes for Component
Replacement."

8) Reconnect the thermistor connector to CB.

9) Replace the control box cover in its correct position.

10) Plug the appliance back into the electrical outlet.

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

Legend: CB–control board; Comp–compressor

18

E. Diagnostic Tables

1. No Ice Production

No Ice Production - Possible Cause

1. Power Supply a) Unplugged, off, blown fuse, or tripped breaker.

b) Not within specications.

2. Water Supply a) Water supply off or improper water pressure.

b) External water lters clogged.

3. Optional Drain Pump
(HS-0248 or HS-5061)

4. Control Switch a) In "OFF" or "WASH" position.

5. Thermostatic Bin Control

See "II.C. Bin Control Check"

6. Control Transformer
(115VAC/24VAC)
(Auxiliary Code C-1 and Later)

7. Control Board a) Defective.

8. Compressor a) External protector defective.

9. Inlet Water Valve a) Screen or orice clogged.

10. Hot Gas Valve a) Closed in harvest cycle.

11. Inlet Water Valve a) Screen or orice clogged.

12. Hot Gas Valve a) Closed in harvest cycle.

13. Thermistor

See "II.E. Thermistor Check"

14. Pump Motor a) Motor winding open.

15. Fan Motor a) Motor winding open.

a) Safety switch open.

b) Connector loose or disconnected.

c) Clogged or kinked hose.

d) Defective.

b) Bad contacts.

a) Out of adjustment.

b) Open with bin lled with ice.

c) Ambient temperature too cool.

d) Bulb out of position.

e) Bin control heater defective.

f) Defective.

a) Defective.

b) PTC defective.

c) Inefficient.

d) Open windings.

b) Coil winding open.

c) Inlet water valve remains open longer than 52 sec. in initial freeze

cycle or remains open in normal freeze cycle.

b) Open in freeze cycle.

b) Coil winding open.

c) Water valve open in freeze cycle.

b) Open in freeze cycle.

a) Loose, disconnected, or defective.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

b) Bearing worn out or locked rotor.

19

2. Freeze-Up

Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See the Hoshizaki America Technician's Pocket Guide or contact your local distributor for a
copy of the freeze-up checklist.

Freeze-Up - Possible Cause

Harvest Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Ice Chute a) Out of position.

b) Damaged.

3. Control Board

See "III.B. Settings and
Adjustments."

4. Bin Control

See "II.C. Bin Control Check"

5. Thermistor

See "II.D. Thermistor Check"

6. Refrigerant Charge a) Low.

7. Hot Gas Valve a) Closed or restricted.

1. Evaporator a) Scaled up.

2. Spray Assembly a) Nozzles dirty.

3. Control Board

See "III.B. Settings and
Adjustments."

4. Thermistor

See "II.E. Thermistor Check"

5. Refrigerant Charge a) Low.

6. Inlet Water Valve a) Leaking by.

7. Pump Motor a) RPM too slow.

a) Harvest control set too short. Do not adjust.

b) Freeze control set too long.

c) Defective.

a) Bin control heater defective.

b) Defective.

a) Loose, disconnected, or defective.

Freeze Cycle

b) Damaged.

b) Ice chute out of position.

a) Freeze control set incorrectly.

b) Defective.

a) Defective.

b) Impeller damaged.

20

3. Low Ice Production

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up, dirty.

2. Ice Chute a) Out of position.

b) Damaged.

3. Refrigerant Charge a) Low.

4. Control Board

See "III.B. Settings and
Adjustments."

5. Thermistor

See "II.E. Thermistor Check"

6. Hot Gas Valve a) Erratic or closed.

7. Inlet Water Valve a) Screen or orice clogged.

8. Compressor a) Inefficient or off.

1. Evaporator a) Scaled up, dirty.

2. Inlet Water Valve a) Leaking by.

3. Hot Gas Valve a) Erratic or open.

4. Condenser a) Clogged.

5. Thermistor

See "II.E. Thermistor Check"

6. Control Board

See "III.B. Settings and
Adjustments."

7. Refrigerant Charge a) Low.

8. Compressor a) Inefficient or off.

9. Pump Motor a) RPM too slow.

a) Thermistor connection loose.

b) Harvest control moved from factory setting.

c) Defective.

a) Loose, disconnected, or defective.

Long Freeze Cycle

a) Loose, disconnected, or defective.

a) Freeze control set too long.

b) Defective.

21

III. Control Board

• A Hoshizaki exclusive control board is employed in AM series appliances.

• All models are pretested and factory adjusted.

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
icemaker 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 short out power supply to test for voltage.

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

22

A. Control Board Layout

1. Auxiliary Code C-0 and Earlier

• C1 Connector

• B1 Connector

Hot Gas Valve

• X1 Relay

Hot Gas Valve
Pump Motor
Fan Motor

115VAC X1 Relay Component Power Supply (hot gas valve, pump motor, fan motor)

• A1 Connector

Pump Motor
Fan Motor

• C2 Connector

115VAC X2 Relay Component Power Supply
(inlet water valve)

• A2 Connector

Inlet Water Valve

• X2 Relay

Inlet Water Valve

• Freeze Control

• Harvest Control

Do not adjust

• TH1 Connector

Thermistor

• Control Transformer

• TH2 Connector

Thermistor

• 115VAC Control Board Power Supply

U–115VAC Control Board Power Supply (BK)
V–Neutral (W)

23

2. Auxiliary Code C-1 and Later

• B1 Connector

Hot Gas Valve

• X1 Relay

Hot Gas Valve
Pump Motor
Fan Motor

• LED 2

Pump Motor
Fan Motor

• C1 Connector

115VAC X1 Relay Component Power Supply (hot gas valve, pump motor, and fan motor)

• A1 Connector

Pump Motor
Fan Motor

• C2 Connector

115VAC X2 Relay Component Power Supply
(inlet water valve)

• A2 Connector

Inlet Water Valve

• X2 Relay

Inlet Water Valve

• LED 3

Hot Gas Valve

LED 2

LED 3

• LED 1 (ashes)

24VAC Power OK

• Freeze Control

• Harvest Control

Do not adjust

• TH1 Connector

Thermistor

LED 1

WARM

COLD

WARM

COLD

• TH2 Connector

Thermistor

• 24VAC Control Board Power Supply

B–24VAC Control Board Power Supply (R)
W–Neutral (LBU)

24

B. Settings and Adjustments

1) VR1 Harvest Control
VR1 harvest control is for adjustment of the harvest cycle completion temperature.
Factory set, do not adjust.

NOTICE

Do not adjust VR1 harvest control. VR1 harvest control is factory set for proper
operation. Adjustment outside of the factory default setting will result in freeze up
and/or damage to the appliance.

a) Initial Harvest: Terminated by 50 sec. harvest timer. No temperature requirement.

b) Normal Harvest: Terminated by temperature (47°F (7°C)) and time (50 sec. harvest

timer).
Once the thermistor warms to 47°F (7°C), CB reads 4.5 kΩ from the thermistor and
turns harvest termination over to the 50-sec. harvest timer.

2) VR2 Freeze Control
VR2 freeze control is for adjustment of the freeze cycle completion temperature
(controls size of hole in ice cube). If adjustment to cube hole size is desired, follow the
instructions below. See Fig. 1.

NOTICE

Do not adjust VR2 to the lowest temperature setting. This will result in freeze up.

a) Larger Hole: Turn VR2 freeze control clockwise for a higher freeze cycle completion

temperature (WARM) for shorter freeze time and ice cubes with larger diameter
holes.

b) Smaller Hole: Turn VR2 freeze control counterclockwise for a lower freeze cycle

completion temperature (COLD) for longer freeze time and ice cubes with smaller
diameter holes.

Control Board

Harvest Control
Do not adjust

COLD

WARM

COLD

WARM

Freeze Control
Adjustment of freeze cycle
completion temperature

Fig. 1

25

C. LED Lights Auxiliary Code C-1 and Later

1) LED 1 24VAC
Green LED 1 ashes to indicate proper 24VAC and continues to ash unless BC is open,

control switch is moved to the "OFF" position, or appliance is unplugged.

2) LED 2 Freeze
GreenLED 2 (PM) turns on at freeze cycle initiation and turns off at freeze cycle
termination.

3) LED 3 Harvest
Green LED 3 (HGV) turns on at harvest cycle initiation and turns off at harvest cycle
termination.

D. Control Switch

The control switch has three positions: "OFF," "ICE," and "WASH." In the "OFF"
position power is still present at the DP connector and DP (if applicable). In the "WASH"

position, PM and FM energize after the 50 sec. HT terminates (C-0 and earlier).

Note: When in the "WASH" position, FM also energizes.

Legend: BC–bin control; DP–drain pump; HGV–hot gas valve; HT–harvest timer; FM–fan

motor; PM–pump motor

26

IV. Refrigeration Circuit and Component Service Information

WARNING

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

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

• Move the control switch to the "OFF" position, then unplug the appliance from the

electrical outlet before servicing.

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

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

service.

A. Refrigeration Circuit Service Information

WARNING

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

properly trained and EPA-certied service personnel.

• 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-134a as a mixture with
pressurized air for leak testing.

NOTICE

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

discharge the refrigerant into the atmosphere.

• Do not leave the system open for longer than 15 min. when replacing or servicing

parts. The Polyol Ester (POE) oils used in R-134a applications 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

ow.

• 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. Refrigerant Recovery

No refrigerant access valves are provided on this appliance. Using proper refrigerant
practices, utilize a temporary tap-line valve on the high side to recover the refrigerant.
Store the refrigerant in an approved container. Do not discharge the refrigerant into
the atmosphere. After recovery is complete, replace the tap-line valve with a proper,
permanent accessvalve.

27

2. Brazing

WARNING

• R-134a itself is not ammable at atmospheric pressure and temperatures up to

212°F (100°C).

• R-134a itself is not explosive or poisonous. However, when exposed to high
temperatures (open ames), R-134a can be decomposed to form hydrouoric
acid and carbonyl uoride both of which are hazardous.

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

1) Braze all ttings while purging with nitrogen gas owing 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

ow.

• 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). Do not use R-134a as a mixture with
pressurized air for leak testing.

3. Evacuation and Recharge (R-134a)

1) Attach a vacuum pump to the system. Be sure the high-side charging hose is connected
to the eld-installed high-side access valve.

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 ow backwards.

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

on pump capacity.

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

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. For the required refrigerant charge, see the rating label inside the icemaker.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets
ARI Standard 700 (latest edition) be used.

28

6) A liquid charge is recommended when charging an R-134a system. 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) Close the high-side valve on the gauge manifold, then close the refrigerant access valve
(if applicable). Disconnect the gauge manifold hose.

9) Cap the access valve to prevent a possible leak.

B. Component Service Information

NOTICE

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

Component Notes

Compressor Install a new drier and PTC relay.

Hot Gas Valve • Replace the strainer.

• Use copper tube of the same diameter and length when replacing valve lines.

Pump Motor Install a new capacitor.

Thermistor • Attach the new thermistor to the evaporator in the same location as the previous

thermistor.

• Smoothly ll the recessed area of the thermistor holder with high thermal conductive

type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound
10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu
Silicones), or equivalent are recommended.

• Secure the thermistor with the holder.

• Be very careful to prevent damage to the leads.

29

V. Maintenance

This appliance must be maintained in accordance with the instruction manual and
labels provided with the appliance. Consult with your local Hoshizaki Certied Service
Representative about maintenance service.

WARNING

• Only qualied service technicians should service this appliance.

• Failure to install, operate, and maintain the appliance in accordance with this

manual will adversely affect safety, performance, component life, and warranty
coverage.

• Move the control switch to the "OFF" position and unplug the appliance from the

electrical outlet before servicing.

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

damp hands.

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

• After service, make sure that there are no wires pinched between the panels and

appliance. Make sure you do not damage or pinch the water supply line, drain
line, or power cord.

A. Maintenance Schedule

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.

Maintenance Schedule

Frequency Area Task

Weekly Scoop Clean the scoop using a neutral cleaner. Rinse thoroughly after cleaning.
Monthly External Water

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

Every 3
Months

Yearly Appliance and Ice

Ice Storage Bin
Drain

Storage Bin
Optional Drain

Pump (HS-0248 or
HS-5061)

Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water

Condenser Inspect. Clean if necessary.
Water Hoses Inspect the water hoses and clean/replace if necessary.

Check for proper pressure and change if necessary.

cleaner to wipe off oil or dirt build up. Clean any chlorine staining (rust
colored spots) using a non-abrasive cleaner like Zud or Bon Ami.

Maintain as outlined in the instruction manual or maintenance label.

Clean and sanitize per the cleaning and sanitizing instructions provided in
the instruction manual.

Test as outlined in "V.B. Optional Drain Pump HS-0248 or HS-5061."

system. Clean the water supply inlet screen.

30

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

If the optional drain pump (HS-0248 or HS-5061) is installed, test its operation at least
once a year as outlined below. Note that the pump has power even when the control

switch is in the "OFF" position.

NOTICE

If the optional drain pump is not operating properly or not primed properly
(HS-0248), it will adversely affect performance, component life, and warranty
coverage and may result in costly water damage.

1) Move the control switch to the "OFF" position, then unplug the appliance from the

electrical outlet. WARNING! To reduce the risk of electric shock, do not touch the
control switch or plug with damp hands.

2) Remove all ice from the ice storage bin.

3) Plug the appliance back in.

4) Slowly pour 24 to 30 oz. (710 to 890 ml) of water over the ice storage bin drain hole in
the ice storage bin.

5a) HS-0248: If water pumps out properly and the drain pump then de-energizes, proceed

to step 6. If water does not pump out properly and/or the drain pump does not
de-energize, follow the steps below to prime the drain pump.

Priming Instructions

a. Disconnect the appliance's power cord from the electrical outlet, then reconnect

to the electrical outlet. WARNING! To reduce the risk of electric shock, do not
touch the power cord with damp hands.

b. Slowly pour another 24 to 30 oz. (710 to 890 ml) of water over the storage bin drain

hole in the storage bin. If not already energized, the drain pump should energize.

c. Conrm that water is discharged through the discharge hose. The drain pump

should then de-energize. If not, repeat steps a through c until water is discharged
through the discharge hose and the drain pump de-energizes. The drain pump is
primed when the drain pump de-energizes.

d. If water now pumps out properly and the drain pump de-energizes, proceed to

step 6. If water still does not pump out properly and/or the drain pump does not
de-energize, replace as needed.

5b) HS-5061: If water pumps out properly and the drain pump then de-energizes, proceed

to step 6. If water does not pump out, conrm 115VAC to drain pump, replace as
needed. Priming does not apply to HS-5061.

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

7) Pour another 24 to 30 oz. (710 to 890 ml) of water into the ice storage bin, then
completely restrict the discharge hose while the drain pump is operating. See Fig.2.
Pour more water into the ice storage bin until the appliance turns off. The drain pump
will continue to operate. Check for leaks.

31

8) Remove the discharge hose restriction and allow the water to be pumped out normally.
Power to the appliance will be restored when the water in the drain pump returns to a
normal level.

9) If the appliance fails to turn off with the discharge hose restricted or the drain pump fails
to pump out the water, replace the drain pump.

Fig. 2

Discharge Hose

32

VI. Preparing the Icemaker for Periods of Non-Use

During extended periods of non-use, extended absences, or in sub-freezing
temperatures, follow the instructions below. When the appliance is not used for two or

three days under normal conditions, it is sufficient to move the control switch to the "OFF"

position.

WARNING

Only qualied service technicians should service this appliance.

NOTICE

During extended periods of non-use, extended absences, or in sub-freezing
temperatures, follow the instructions below to reduce the risk of costly water
damage.

1) Close the water supply line shut-off valve, then open the water supply line drain valve.

2) Allow the line to drain by gravity.

3) Attach a compressed air or carbon dioxide supply to the water supply line drain.

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

5) Blow the water supply line out using the compressed air or carbon dioxide supply.

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

7) Unplug the appliance.

8) Close the water supply line drain valve.

9) Remove the water tank hose and drain the water tank.

10) Optional drain pump: remove the drain pump and empty the drain pump reservoir.
Replace the drain pump in its original position.

11) Remove all ice from the ice storage bin. Clean the ice storage bin liner using a neutral
cleaner. Rinse thoroughly after cleaning.

33

VII. Disposal

This appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certied service personnel.

34

VIII. Technical Information

T

A

222

A. Specication and Performance Data

1. AM-50BAE, AM-50BAE-DS, AM-50BAE-AD, AM-50BAE-ADDS

SPECIFICATION SHEE

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 3.4 A (5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 238 (16.8) 227 (9.9)
WATER gal./24HR (gal./100 lbs.) 22.0 (63.9) 30.0 (53.7)
ICE PRODUCTION PER CYCLE 0.65 lbs. (0.29 kg) 24 pcs.
APPROXIMATE STORAGE CAPACITY 27 lbs. (12.5 kg) [Bin Control Setting 22 lbs. (10.0 kg)]
REFRIGERANT CHARGE R134a 4.2 oz. (120 g)

PERFORMANCE DAT

APPROXIMATE ICE
PRODUCTION PER 24 HR.

lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION

watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min.
HARVEST CYCLE TIME

min.
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

MODEL: AM-50BAE, AM-50BAE-DS, AM-50BAE-AD, AM-50BAE-ADDS

MODEL: AM-50BAE, AM-50BAE-DS, AM-50BAE-AD, AM-50BAE-ADDS

AMBIENT TEMP.

(ºF/ºC)
70/21
80/27
90/32
100/38

70/21

80/27

90/32

100/38

70/21

80/27

90/32

100/38

70/21

80/27

90/32

100/38

70/21

80/27

90/32

100/38

70/21

80/27

90/32

100/38

70/21

80/27

90/32

100/38

50/10 70/21 90/32

55

50 23 41 19 41 19
49 22
42 19 34 15 32 15

227

229 234 243
230
236 240 253

30

28 0.11 24 0.09 22 0.08
27 0.10
24 0.09 21 0.08 17 0.06

15

16 19
17
20 22 29

2.5

2.5 2 2
2

145

157 11.0 182 12.8 202 14.2
161 11.3
165 11.6 205 14.4 240 16.9

18

21 1.5 26 1.8 28 2.0
22 1.5
22 1.5 31 2.2

WATER TEMP. (ºF/ºC)

25

49 22 46 21

34

0.11

27 0.10 24 0.09

22

10.2

161 11.3 182 12.8

200

1.3

22 1.5 25 1.8

30

15

33 15

230 237

238

0.08

19 0.08

17 20

21

2.5 2.5

2

14.1

2.1

221 15.5

33 2.3

35

246

23
25

2

2.5

TOTAL HEAT OF REJECTION FROM CONDENSER 1850 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

1. We reserve the right to make changes in specications and design without prior
notice.

2. Pressure data is recorded at 5 min. into freezing cycle. The data not in bold
should be used for reference only.

35

B. Wiring Diagrams

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

a) HS-0248

To Icemaker

b) HS-5061

To Icemaker

38