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II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

Components Ener

giz

ed when the Contr

ol S

witc

h is in the "W

SH" P

osition

The "W

SH" position on the contr

ol s

witch is used when cleaning and sanitizing the

icemak

. W

hen in the "W

SH" position,

er is supplied t

o the pump mot

or and f

an mot

. The cleaner and sanitiz

er fl

ow o

ver the e

vapor

or plat

e assemb

Leg

end:

–bin contr

BCH

–bin contr

ol heat

Comp

–compr

essor

–dr

ain pump (optional)

–f

an mot

–fr

eez

e timer

FTT

–fr

eez

e t

mination timer

HGV

–hot g

as v

–har

vest timer

–pump mot

–inlet w

er v

WVT

–inlet w

er v

ve timer

3-min.

in contr

AM-50B

AE Ser

ies Sequence Flo

w Char

Initial

Har

vest

ycl

cle St

eps

Initial F

reez

e Cy

cle

•

WV contin

ues f

or 52 sec.

dur

ing initial fr

eez

• 3-min.

T r

esets if t

emper

atur

e r

ises abo

°F (-3°C)

dur

ing 3-min.

Ther

mist

in contr

Nor

mal Har

vest Cy

cle

•

WV time:

02 sec.

or the

length of har

vest, whiche

ver

is shor

ter

BCH

ener

giz

Comp

ener

giz

HGV

ener

giz

ener

giz

Ther

mist

or dr

ops t

°F (-3°C)

(6.8 kΩ or mor

e).

3-min.

T st

BCH

contin

ues

Comp

contin

ues

de-ener

giz

de-ener

giz

HGV

ener

giz

ener

giz

tup

Ther

mist

in contr

BCH

contin

ues

Comp

contin

ues

ener

giz

ener

giz

HGV

de-ener

giz

50-sec.

Ther

mist

or t

emper

atur

reaches 45

°F (7°C)

(4.5 kΩ or less).

50 sec.

HT st

50-sec.

HT in

contr

Bin F

ull

ithin 1

0 sec.

ter ice

cont

acts ther

most

atic

ulb

, appliance shuts

wn.

Shutdo

wn and R

estar

BC Oper

ation

Ice cont

acts

ther

most

atic b

ulb

open

All components

-ener

giz

ed e

xcept

BCH

and

Icemak

er Of

All

components

de-ener

giz

ed.

Ice Le

vel Lo

No ice t

ouching

ther

most

atic b

ulb

Icemak

er st

ts at

. Initial Har

vest C

ycle

To 1 abo

closed

Nor

mal F

reez

e Cy

cle

•

3-min.

resets

temper

atur

rises

abo

°F (-3°C)

dur

ing 3-min.

5-min.

in contr

If ther

mist

or st

belo

°F (-3°C),

3-min.

eez

e timer

ter

minat

es and

5-min F

TT st

Otherwise

, 3-min.

rest

BCH

contin

ues

Comp

contin

ues

ener

giz

ener

giz

HGV

de-ener

giz

de-ener

giz

de-ener

giz

102-sec.

WVT

52-sec.

3-min.

in contr

Ther

mist

in contr

5-min.

in contr

Ther

mist

or dr

ops t

°F (-3°C)

(6.8 kΩ or mor

e).

3-min.

T st

If ther

mist

or st

belo

°F (-3°C),

3-min.

eez

e timer

ter

minat

es and

5-min F

TT st

Otherwise

, 3-min.

rest

102-sec.

WVT

Содержание AM-50BAE

Страница 1: ...A Superior Degree of Reliability www hoshizaki com Models AM 50BAE AM 50BAE DS AM 50BAE AD AM 50BAE ADDS Self Contained Cuber Hoshizaki America Inc Number 73126 Issued 12 22 2004 Revised 5 23 2013 SERVICE MANUAL ...

Страница 2: ... due to improper installation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified 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 1 800 233 1940 770 487...

Страница 3: ...ontrol 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 Specification and Performance Data 35 B Wiring Diagr...

Страница 4: ...se code requirements could result in death electric shock serious injury fire 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 applian...

Страница 5: ...operly 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 fingers when opening and closing the door Be careful when opening and closing the door when chil...

Страница 6: ... is not operating properly or not primed properly HS 0248 water could back up and overflow 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 ...

Страница 7: ...onstruction and Water Refrigeration Circuit Diagram A Construction Top Panel Ice Making Mechanism Scoop Holder Front Panel Control Switch Louver Bin Control Thermostat Bulb Slope Magnet Catch Door Power Cord ...

Страница 8: ...nlet Water Valve Pump Motor Water Tank Evaporator Capillary Tube Accumulator Ice Storage Bin Hot Gas Valve Compressor Condenser Drier Fan Water Circuit Refrigeration Circuit Spray Assembly Ice Chute Strainer Thermistor To Drain Heat Exchanger ...

Страница 9: ...in FT starts BCH continues Comp continues FM de energized PM de energized HGV energized WV energized Startup Thermistor in control BCH continues Comp continues FM energized PM energized HGV de energized 50 sec HT Thermistor temperature reaches 45 F 7 C 4 5 kΩ or less 50 sec HT starts 50 sec HT in control 1 Bin Full Within 10 sec after ice contacts thermostatic bulb appliance shuts down Shutdown an...

Страница 10: ... 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 neu...

Страница 11: ...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...

Страница 12: ...heck 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...

Страница 13: ...ernal 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 presen...

Страница 14: ...4VAC 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 flashing 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...

Страница 15: ... 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...

Страница 16: ... 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 close...

Страница 17: ...emperature 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 supplie...

Страница 18: ...k 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 cove...

Страница 19: ...ive 6 Control Transformer 115VAC 24VAC Auxiliary Code C 1 and Later a Defective 7 Control Board a Defective 8 Compressor a External protector defective b PTC defective c Inefficient d Open windings 9 Inlet Water Valve a Screen or orifice clogged 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 10 Hot Gas Valve a ...

Страница 20: ... adjust b Freeze control set too long c Defective 4 Bin Control See II C Bin Control Check a Bin control heater defective b Defective 5 Thermistor See II D Thermistor Check a Loose disconnected or defective 6 Refrigerant Charge a Low 7 Hot Gas Valve a Closed or restricted Freeze Cycle 1 Evaporator a Scaled up b Damaged 2 Spray Assembly a Nozzles dirty b Ice chute out of position 3 Control Board Se...

Страница 21: ...heck a Loose disconnected or defective 6 Hot Gas Valve a Erratic or closed 7 Inlet Water Valve a Screen or orifice clogged 8 Compressor a Inefficient or off Long Freeze Cycle 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 a Loose disconnected or defective 6 Control Board See III B Settin...

Страница 22: ...ircuits 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 assembl...

Страница 23: ...s Valve X1 Relay Hot Gas Valve Pump Motor Fan Motor TH2 Connector Thermistor Control Transformer X2 Relay Inlet Water Valve C1 Connector 115VAC X1 Relay Component Power Supply hot gas valve pump motor fan motor C2 Connector 115VAC X2 Relay Component Power Supply inlet water valve A1 Connector Pump Motor Fan Motor A2 Connector Inlet Water Valve Harvest Control Do not adjust Freeze Control ...

Страница 24: ... Valve Pump Motor Fan Motor TH2 Connector Thermistor LED 3 Hot Gas Valve X2 Relay Inlet Water Valve C1 Connector 115VAC X1 Relay Component Power Supply hot gas valve pump motor and fan motor C2 Connector 115VAC X2 Relay Component Power Supply inlet water valve A1 Connector Pump Motor Fan Motor A2 Connector Inlet Water Valve LED 2 Pump Motor Fan Motor LED 1 flashes 24VAC Power OK Harvest Control Do...

Страница 25: ...tion 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 h...

Страница 26: ...ermination 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...

Страница 27: ... 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 syste...

Страница 28: ...g 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 field installed high side access valve IMPORTANT The vacuum level and vacuum pump may be the same as those for current ...

Страница 29: ...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 thermisto...

Страница 30: ...rd 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 Check for proper pressure and change if n...

Страница 31: ...e 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 Confirm that water is discharged through the discharge hose The drain pump should the...

Страница 32: ...d 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 ...

Страница 33: ... 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...

Страница 34: ...posal 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 certified service personnel ...

Страница 35: ... 24 0 09 22 0 08 90 32 27 0 10 22 0 08 19 0 08 gal day m3 day 100 38 24 0 09 21 0 08 17 0 06 70 21 80 27 90 32 min 100 38 70 21 80 27 90 32 min 100 38 70 21 145 10 2 161 11 3 182 12 8 80 27 157 11 0 182 12 8 202 14 2 90 32 161 11 3 200 14 1 221 15 5 PSIG kg cm2 G 100 38 165 11 6 205 14 4 240 16 9 70 21 18 1 3 22 1 5 25 1 8 80 27 21 1 5 26 1 8 28 2 0 90 32 22 1 5 30 2 1 33 2 3 PSIG kg cm2 G 100 38 ...

Страница 36: ...36 B Wiring Diagrams 1 Auxiliary Code C 0 and Earlier ...

Страница 37: ...37 2 Auxiliary Code C 1 and Later ...

Страница 38: ...38 3 HS 0248 and HS 5061 Optional Drain Pump a HS 0248 b HS 5061 To Icemaker To Icemaker ...

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