Hoshizaki America FD-1001MLH-C Service Manual
Hoshizaki America, Inc.
Hoshizaki
Modular Flaker
Models
FD-1001MAH(-C)
“A Superior Degree
of Reliability”
www.hoshizaki.com
FD-1001MWH(-C)
FD-1001MRH(-C)
FD-1001MLH(-C)
SERVICE MANUAL
Number: 73159
Issued: 2-12-2010
IMPORTANT
Only qualied service technicians should install, service, and maintain the
icemaker. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual. Failure to service and maintain
the equipment in accordance with this manual may adversely affect safety,
performance, component life, and warranty coverage.
Hoshizaki provides this manual primarily to assist qualied service technicians in the
service and maintenance of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, write, or send an e-mail message to the Hoshizaki Technical
Support Department for assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 3069
Attn: Hoshizaki Technical Support Department
Phone: 1-800-33-1940 Technical Support
(770) 487-331
Fax: 1-800-843-1056
(770) 487-3360
E-mail: techsupport@hoshizaki.com
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.
IMPORTANT
This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualied service technicians
should install, service, and maintain the icemaker. Read the warnings
contained in this booklet carefully as they give important information regarding
safety. Please retain this booklet for any further reference that may be
necessary.
CONTENTS
Important Safety Information ................................................................................................. 7
I. Specications ..................................................................................................................... 8
A. Icemaker ....................................................................................................................... 8
1. FD-1001MAH (air-cooled) ....................................................................................... 8
. FD-1001MAH-C (air-cooled) ................................................................................... 9
3. FD-1001MWH (water-cooled) ............................................................................... 10
4. FD-1001MWH-C (water-cooled) ............................................................................ 11
5. FD-1001MRH (remote air-cooled) ......................................................................... 1
6. FD-1001MRH-C (remote air-cooled) ..................................................................... 13
7. FD-1001MLH (low side, parallel rack system) ....................................................... 14
8. FD-1001MLH-C (low side, parallel rack system) ................................................... 15
B. Condenser Unit ........................................................................................................... 16
1. URC-5F ................................................................................................................. 16
II. General Information ......................................................................................................... 18
A. Construction ................................................................................................................ 18
1. FD-1001MAH(-C) (air-cooled) ............................................................................... 18
. FD-1001MWH(-C) (water-cooled) ......................................................................... 19
3. FD-1001MRH(-C) (remote air-cooled) ................................................................... 0
4. FD-1001MLH(-C) (low side, parallel rack system) ................................................ 1
5. Ice Making Unit ......................................................................................................
B. Sequence of Operation ............................................................................................... 3
1. Sequence Cycles and Shutdown .......................................................................... 3
a) Fill Cycle .......................................................................................................... 3
b) Ice Purge Cycle ............................................................................................... 3
c) Freeze Cycle .................................................................................................... 3
d) Drain Cycle ..................................................................................................... 3
e) Shutdown Cycle ............................................................................................... 4
. Sequence Flow Chart ............................................................................................ 5
C. Control Board ............................................................................................................. 6
1. Control Board Layout ............................................................................................ 7
. Features ................................................................................................................ 8
a) Low Water Safety ............................................................................................ 8
b) Ice Purge Cycle Bypass ................................................................................... 8
c) Freeze Timer .................................................................................................... 8
d) Drain Frequency .............................................................................................. 8
e) Bin Control Shutdown Delay ............................................................................ 8
f) High Voltage and Low Voltage Cut-outs ........................................................... 9
g) LED Lights and Alarm Safeties Chart .............................................................. 9
3
3. Alarm Safeties ....................................................................................................... 30
a) Low Water Safety (1-beep alarm) .................................................................... 30
b) Control Switch in the "DRAIN" Position (-beep alarm) ................................... 30
c) High Pressure Switch (3 & 4-beep alarms) ...................................................... 30
d) Freeze Timer (5-beep alarm) ........................................................................... 30
e) Low Voltage (6-beep alarm) ............................................................................ 30
f) High Voltage (7-beep alarm) ............................................................................. 31
g) Gear Motor (8-beep alarm) .............................................................................. 31
h) Bin Control (9-beep alarm) ............................................................................ 31
4. Controls and Adjustments ..................................................................................... 31
a) Default Dip Switch Settings ............................................................................. 31
b) Infrared Sensor Shutdown Delay (S1 dip switch 1, , & 3) .............................. 3
c) Drain Frequency Control (S1 dip switch 4) ...................................................... 3
d) Continuous Dispensing Timer (S1 dip switch 5 & 6) ........................................ 3
e) Bin Control Selector (S1 dip switch 7) ............................................................. 33
f) Mechanical Bin Control Shutdown Delay (S1 dip switch 8) .............................. 33
g) Factory Use (S1 Dip Switch 9 & 10) ................................................................ 33
D. Bin Control .................................................................................................................. 34
E. Float Switch ................................................................................................................ 34
III. Technical Information ..................................................................................................... 35
A. Water Circuit and Refrigeration Circuit ....................................................................... 35
1. FD-1001MAH(-C) (air-cooled) ............................................................................... 35
. FD-1001MWH(-C) (water-cooled) ......................................................................... 36
3. FD-1001MRH(-C) (remote air-cooled) ................................................................... 37
4. FD-1001MLH(-C) (low side, parallel rack system) ................................................ 38
B. Wiring Diagrams ......................................................................................................... 39
1. FD-1001MAH(-C), FD-1001MWH(-C), FD-1001MRH(-C) ..................................... 39
. FD-1001MLH(-C) .................................................................................................. 40
3. Sequence Wiring Diagram .................................................................................... 41
a) Fill Cycle. ........................................................................................................ 41
b) Ice Purge Cycle .............................................................................................. 4
c) Freeze Cycle ................................................................................................... 43
d) 1-in-1 Drain Cycle ........................................................................................... 44
e) 1-in-1 Drain Cycle ......................................................................................... 45
f) Infrared Sensor Shutdown ................................................................................ 46
g) Mechanical Bin Control Shutdown ................................................................... 47
h) Low Water Safety ............................................................................................ 48
i) High Pressure Switch ........................................................................................ 49
C. Performance Data ...................................................................................................... 50
1. FD-1001MAH (air-cooled) ..................................................................................... 50
. FD-1001MAH-C (air-cooled) ................................................................................. 51
3. FD-1001MWH (water-cooled) ............................................................................... 5
4. FD-1001MWH-C (water-cooled) ............................................................................ 53
5. FD-1001MRH (remote air-cooled) ......................................................................... 54
6. FD-1001MRH-C (remote air-cooled) ..................................................................... 55
7. FD-1001MLH (low side, parallel rack system) ....................................................... 56
8. FD-1001MLH-C (low side, parallel rack system) ................................................... 57
4
IV. Service Diagnosis .......................................................................................................... 58
A. Ice Production Check .................................................................................................. 58
B. Diagnostic Procedure ................................................................................................. 58
C. Control Board Check .................................................................................................. 61
D. Bin Control Check ....................................................................................................... 66
1. Infrared Sensor Check .......................................................................................... 66
. Mechanical Bin Control Check .............................................................................. 67
E. Float Switch Check and Cleaning ............................................................................... 69
1. Float Switch Check ................................................................................................ 69
. Float Switch Cleaning ............................................................................................ 69
F. Diagnostic Charts ........................................................................................................ 71
1. No Ice Production .................................................................................................. 71
. Low Ice Production ................................................................................................ 74
3. Other ..................................................................................................................... 75
V. Removal and Replacement of Components ................................................................... 76
A. Service for Refrigerant Lines ...................................................................................... 76
1. Refrigerant Recovery (except MLH model) ........................................................... 76
. Brazing .................................................................................................................. 77
3. Evacuation and Recharge (R-404A) (except MLH model) .................................... 77
4. Refrigerant Recovery, Evacuation, and Recharge - MLH Model (low side, parallel
rack system) .......................................................................................................... 78
B. Removal and Replacement of Compressor ................................................................ 79
C. Removal and Replacement of Expansion Valve......................................................... 80
D. Removal and Replacement of Evaporator Assembly Components ............................ 81
1. Upper Bearing Wear Check .................................................................................. 8
. Removal and Replacement of Cutter .................................................................... 8
3. Removal and Replacement of Extruding Head ..................................................... 83
4. Removal and Replacement of Auger .................................................................... 83
5. Removal and Replacement of Evaporator ............................................................ 84
6. Removal and Replacement of Mechanical Seal and Lower Housing ................... 85
7. Removal and Replacement of Gear Motor ............................................................ 86
E. Removal and Replacement of Air-Cooled Condenser ................................................ 87
F. Removal and Replacement of Water-Cooled Condenser ........................................... 88
G. Removal and Replacement of Water Regulating Valve - Water-Cooled Model ......... 89
H. Adjustment of Water Regulating Valve - Water-Cooled Model ................................... 90
I. Removal and Replacement of Fan Motor (air-cooled and remote air-cooled models) . 90
J. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)
- Remote Air-Cooled Model ...................................................................................... 91
K. Removal and Replacement of Liquid Line Valve or Suction Line Valve - MLH Model
(low side, parallel rack system) ................................................................................. 9
L. Removal and Replacement of Evaporator Pressure Regulator (E.P.R.) MLH Model
(low side, parallel rack system) ................................................................................. 93
M. Removal and Replacement of Water Valves.............................................................. 93
1. Inlet Water Valve ................................................................................................... 93
. Drain Valve ............................................................................................................ 94
N. Removal and Replacement of Control Board ............................................................. 95
5
VI. Cleaning and Maintenance ............................................................................................ 96
A. Cleaning and Sanitizing Instructions ........................................................................... 96
1. Cleaning Solution .................................................................................................. 96
. Cleaning Procedure ............................................................................................... 96
3. Sanitizing Solution ................................................................................................. 98
4. Sanitizing Procedure - Initial .................................................................................. 98
5. Sanitizing Procedure - Final .................................................................................. 99
B. Maintenance ............................................................................................................. 100
C. Preparing the Icemaker for Long Storage ................................................................ 10
6
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, or damage to the unit.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
CAUTION Indicates a situation which could result in damage to the unit.
IMPORTANT Indicates important information about the use and care of the
unit.
WARNING
This icemaker 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
eventual damage caused by improper, incorrect, and unreasonable use.
To reduce the risk of death, electric shock, serious injury, or re, follow
basic precautions including the following:
• Electrical connection must be hard-wired and must meet national, state, and
local electrical code requirements. Failure to meet these code requirements
could result in death, electric shock, serious injury, re, or severe damage to
equipment.
• This unit requires an independent power supply. See the nameplate for
proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse
can result in a tripped breaker, blown fuse, or damage to existing wiring. This
could lead to heat generation or re.
• THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could
result in death or serious injury.
• This unit should be disassembled or repaired only by qualied service
personnel to reduce the risk of electric shock, injury, or re.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, re, or damage to the unit.
7
I. Specications
A. Icemaker
1. FD-1001MAH (air-cooled)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
8
2. FD-1001MAH-C (air-cooled)
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
COMPRESSOR 240 V 4.2 RLA 34 LRA
GEAR MOTOR 120 V 3 FLA 1/4 HP
FAN MOTOR 115 V 0.85FLA 1/15 HP
OTHER 120 V 0.03A
MAXIMUM FUSE SIZE 15 A
MAX. HACR BREAKER (USA ONLY) 15 A
MAX. CIRC. BREAKER (CANADA ONLY) 15 A
MINIMUM CIRCUIT AMPACITY 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *940 (427) 890 (405) 855 (389)
Reference without *marks 80 820 (373) 790 (358) 755 (344)
90 725 (330) *695 (317) 670 (304)
100 640 (292) 615 (280) *580 (265)
SHAPE OF ICE Cubelet
ICE QUALITY Approx. 80%, Ice (90/70°F, Conductivity 200 µs/cm)
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1390 (4.8) 1320 (3.4)
POTABLE WATER 86 (12) 113 (12)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 22" x 24" x 25-15/16" (560 x 610 x 658mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 176 lbs. ( 80 kg ), Shipping 205 lbs. ( 93 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
ICE MAKING SYSTEM Auger type
HARVESTING SYSTEM Direct Driven Auger ( 1/4 HP Gear Motor )
ICE MAKING WATER CONTROL Float Switch
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM (PRIMARY) Photoelectric Sensor
BIN CONTROL SYSTEM (SECONDARY) Mechanical Bin Control (Proximity Sw.)
COMPRESSOR Hermetic, Model RS70-C1E-PFV
CONDENSER Air-cooled, Fin and tube type
EVAPORATOR Copper Tube on Cylinder
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb.12oz. (800g)
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-off Relay
COMPRESSOR PROTECTION Internal Protector
GEAR MOTOR PROTECTION Fuse (3A)
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch and Timer
ACCESSORIES -SUPPLIED Spare Fuse
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187-253 V
AMBIENT TEMP. 45-100° F
WATER SUPPLY TEMP. 45-90° F
WATER SUPPLY PRESSURE 10-113 PSIG
Note: We reserve the right to make changes in specications and design without prior
notice.
9
3. FD-1001MWH (water-cooled)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
10
4. FD-1001MWH-C (water-cooled)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
11
5. FD-1001MRH (remote air-cooled)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
1
6. FD-1001MRH-C (remote air-cooled)
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
COMPRESSOR 240 V 4.2 RLA 34 LRA
GEAR MOTOR 120 V 3 FLA 1/4 HP
FAN MOTOR REMOTE 115 V 3A MAX
OTHER 120 V 0.03A
MAXIMUM FUSE SIZE 15 A
MAX. HACR BREAKER (USA ONLY) 15 A
MAX. CIRC. BREAKER (CANADA ONLY) 15 A
MINIMUM CIRCUIT AMPACITY 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *930 (423) 895 (406) 860 (390)
Reference without *marks 80 825 (375) 790 (360) 760 (345)
90 730 (332) *720 (326) 670 (306)
100 645 (294) 620 (282) *580 (263)
SHAPE OF ICE Cubelet
ICE QUALITY Approx. 80%, Ice (90/70°F, Conductivity 200 µs/cm)
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1449 (4.8) 1401 (3.6)
POTABLE WATER 86 (12) 112 (12)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 22" x 24" x 25-15/16" (560 x 610 x 658mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 176 lbs. ( 80 kg ), Shipping 205 lbs. ( 93 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- REFRIGERATION Discharge line 1-1/16-12 UNF Fitting (#10 AEROQUIP)
CIRCUIT Liquid line 5/8-18 UNF Fitting (#6 AEROQUIP)
ICE MAKING SYSTEM Auger type
HARVESTING SYSTEM Direct Driven Auger ( 1/4 HP Gear Motor )
ICE MAKING WATER CONTROL Float Switch
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM (PRIMARY) Photoelectric Sensor
BIN CONTROL SYSTEM (SECONDARY) Mechanical Bin Control (Proximity Sw.)
COMPRESSOR Hermetic, Model RS70-C1E-PFV
CONDENSER Air-cooled Remote Condenser unit URC-5F Recommended
EVAPORATOR Copper Tube on Cylinder
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-5F
REFRIGERANT CHARGE R-404A, 4 lb.1oz. (1850g)
(Ice Maker: 2 lb. 3 oz., Cond. Unit: 1 lb. 14 oz. )
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-off Relay
COMPRESSOR PROTECTION Internal Protector
GEAR MOTOR PROTECTION Fuse (3A)
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch and Timer
ACCESSORIES -SUPPLIED Spare Fuse
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187-253 V
AMBIENT TEMP. 45-100° F
WATER SUPPLY TEMP. 45-90° F
WATER SUPPLY PRESSURE 10-113 PSIG
13
7. FD-1001MLH (low side, parallel rack system)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
14
8. FD-1001MLH-C (low side, parallel rack system)
Awaiting Data
Note: We reserve the right to make changes in specications and design without prior
notice.
15
AC SUPPLY VOLTAGE 115/60/1 (Connection to Icemaker)
FAN MOTOR
115 V Total 1.3FLA 65W
EXTERIOR DIMENSIONS (WxDxH
) 21-15/16" x 15-11/16" x 17-7/8" (557 x 398 x 454 mm)
DIMENSIONS INCLUDING LEGS (WxDxH
) 24" x 18-1/8" x 32-13/16" (610 x 460 x 834 mm)
EXTERIOR FINIS
H Galvanized Steel
WEIGHT Net 61 lbs. ( 28 kg ) Shipping 68 lbs. ( 31 kg )
CONNECTIONS - ELECTRI
C Permanent - Connection
- REFRIGERANT Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)
Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)
CONDENSER Air-cooled, Fin and tube type
FAN MOTOR PROTECTIO
N Thermal Protection
REFRIGERANT CONTROL Condensing Pressure Regulator
REFRIGERANT CHARG
E R-404A 1 lb. 14 oz. (850g)
DESIGN PRESSURE High 467 PSIG
OPERATING CONDITIONS VOLTAGE RANGE 104 ~ 127 V
AMBIENT TEMP
. -20 ~ 122 °F
ACCESSORIES -SUPPLIED Leg 2 pcs
Hex. Head Bolt w/Washe
r 8 x 16 8 pcs
Hex. Nut 8 8 pcs
B. Condenser Unit
1. URC-5F
a) Specications
Note: We reserve the right to make changes in specications and design without prior
notice.
16
b) Dimensions
24"
(610 mm)
23-1/32"
(585 mm)
Unit: in. (mm)
18-1/8"
(460 mm)
17-1/8"
(435 mm)
14-9/16"
(370 mm)
19-11/16"
(500 mm)
18-1/8"
(460 mm)
20-15/32"
(520 mm)
21-15/16"
(557 mm)
6/16" × 3/4" (10×20 mm)
4×2 (SLOTTED HOLES)
14-1/8"
(358 mm)
(380 mm)
14-15/16"
(398 mm)
15-11/16"
17-7/8"
(454 mm)
(380 mm)
14-15/16"
2-1/2"
(63 mm)
7/8" DIA. HOLE
(23 mm DIA.)
6-5/16"
(160 mm)
2-15/16"
(75 mm)
17
II. General Information
A. Construction
1. FD-1001MAH(-C) (air-cooled)
Spout
Extruding Head
Heater
(FD-1001MAH-C)
Evaporator
Expansion
Valve
Gear Motor
Inlet Water Valve
Mechanical Bin Control
Control Box
Fan Motor
Air-Cooled
Condenser
Ice Chute
Compressor
Infrared Sensor
18
2. FD-1001MWH(-C) (water-cooled)
Extruding Head
Heater
(FD-1001MWH-C)
Evaporator
Expansion
Valve
Gear Motor
Inlet Water Valve
Spout
Mechanical Bin Control
Control Box
Water
Regulating
Valve
Water-Cooled
Condenser
Ice Chute
Compressor
Infrared Sensor
19
3. FD-1001MRH(-C) (remote air-cooled)
Extruding Head
Heater
(FD-1001MRH-C)
Evaporator
Expansion
Valve
Gear Motor
Inlet Water Valve
Spout
Mechanical Bin Control
Control Box
Ice Chute
Infrared Sensor
Compressor
0
4. FD-1001MLH(-C) (low side, parallel rack system)
Extruding Head
Heater
(FD-1001MLH-C)
Evaporator
Expansion
Valve
Gear Motor
Inlet Water Valve
Spout
Mechanical Bin Control
Control Box
Liquid
Line
Valve
Strainer
Evaporator
Pressure
Regulator
Ice Chute
Suction
Line
Valve
Infrared Sensor
1
5. Ice Making Unit
Extruding Head Heater
(Cubelet Models Only)
Cutter
Extruding Head
Upper Bearing
Allen Head Cap Screw
Auger
Cylinder
Insulation
Mechanical Seal
O-Ring
Housing-Lower Bearing
Spline Coupling
Allen Head Cap Screw
Hexagon Head Bolt
Gear Motor
B. Sequence of Operation
The steps in the sequence are as outlined below. This unit utilizes a control board to
switch the components on and off as needed. When power is supplied, the power switch
is in the "ON" position, and the control switch is in the "ICE" position, CB "POWER OK"
LED comes on.
1. Sequence Cycles and Shutdown
a) Fill Cycle
"WTRIN" LED is on. WV energizes and ll cycle begins. UF/S closes and WV
de-energizes. 30-second GM delay timer starts. If UF/S remains open during ll cycle
longer than 90 seconds, WV remains energized, and a 1-beep alarm sounds.
b) Ice Purge Cycle
"GM" LED is on. 30-second GM delay timer terminates. GMR (X on CB), GM, GMPR,
FM/FMR energize. 5-minute ice purge timer starts; GM runs for 5 minutes to clear any
ice from the evaporator. To bypass, press the "SERVICE" button on the control board
after GM starts. WARNING! Risk of electric shock. Care should be taken not to
touch live terminals.
Note: UF/S must be closed before GMR will energize.
c) Freeze Cycle
"COMP" and "GM" LEDs are on. 5-minute ice purge timer terminates. GMR (X on
CB), GM, GMPR, and FM/FMR remain energized, CR (X1 on CB) and Comp energize
(LLV and SLV energize on MLH models). As water in the evaporator cools, ice starts
forming within 4 to 6 minutes. This time frame depends on the inlet water and ambient
temperature conditions. UF/S and LF/S operate WV as needed to continue the ice
making process. This continues until BC shuts down the icemaker or power is turned off
to the unit.
d) Drain Cycle
(1) 1-in-1 Drain Cycle: DV energizes once every hour when the 1-in-1 drain cycle
is activated (S1 dip switch 4 is in the "OFF" position (factory default position)).
GMR (X on CB), GM, GMPR, FM/FMR, CR (X1 on CB), and Comp continue. DV
energizes for seconds every hour. This setting is recommended for optimum
icemaker performance. The 1-in-1 drain cycle allows any sediment to drain from the
evaporator without interrupting the icemaking process.
(2) 1-in-12 Drain Cycle (optional): DV energizes once every 1 hours when the 1-in-1
drain cycle is activated (S1 dip switch 4 is in the on position (optional)). 1 hour
drain cycle timer terminates, CR (X1 on CB) and Comp de-energize (LLV and SLV
de-energize on MLH model), GMR (X on CB), GM, GMPR, and FM/FMR continue.
The 5-minute ice purge timer begins. When the 5-minute ice purge timer terminates,
GMR (X on CB), GM, GMPR, and FM/FMR de-energize. 10-minute DT begins, DV
energizes. After 10-minute DT terminates, 1 hour drain cycle timer starts.
3
(3) Manual Drain: Manual drain is used when servicing evaporator components and
cleaning and sanitizing the unit. When the unit is making ice and the control switch is
moved to the "DRAIN" position, there is a 3-second delay, then CR (X1 on CB) and
Comp (LLV and SLV on MLH models) de-energize and the 5-minute ice purge timer
begins. When the 5-minute ice purge timer terminates, GMR (X on CB), GM, GMPR,
and FM/FMR de-energize. DV energizes to drain the evaporator and reservoir. To
avoid the 5-minute shutdown delay, turn off the power supply, then move the control
switch to the "DRAIN" position. Turn on the power supply. DV energizes to drain the
evaporator and reservoir. DV de-energizes when the control switch is moved to the
"ICE" position.
e) Shutdown Cycle
(1) Infrared Sensor: When power is supplied to the icemaker, the green LED on IS
turns on. The green LED remains on constantly. As ice lls the storage bin to the
level of activating IS, IS yellow LED turns on (ashing or steady). The yellow LED
ashes when ice is at the outer limit of its range and turns steady as ice nears. After
the yellow LED turns on (ashing or steady), IS shutdown delay timer (S1 dip switch
1, , & 3) begins. For a typical dispenser unit application, a 100-second shutdown
delay is recommended. When used with a standard Hoshizaki storage bin, any
shutdown delay setting is acceptable. See "II.C.4.b) Infrared Sensor Shutdown Delay
(S1 dip switch 1, , & 3)." Once IS shutdown delay timer terminates, CR (X1 on CB)
and Comp (LLV and SLV on MLH models) de-energize and the 5-minute ice purge
timer begins. When the 5-minute ice purge timer terminates, GMR (X on CB), GM,
GMPR, and FM/FMR de-energize. See "II.D. Bin Control."
Note: If IS fails to shutdown the icemaker, MBC opens, CB shuts down the icemaker
and a 9-beep alarm sounds.
(2) Mechanical Bin Control: CB shuts down the entire unit within 10 seconds when
MBC opens (actuator paddle engaged), and sounds a 9-beep alarm. For further
details, see "II.C.4.f) Mechanical Bin Control Shutdown Delay (S1 dip switch 8)" and
"II.D. Bin Control."
Legend: BC–bin control; CB–control board; Comp–compressor;
CR–compressor relay; DT–drain timer; DV–drain valve; FM–fan motor;
FMR–fan motor-remote; GM–gear motor; GMPR–gear motor protect relay;
GMR–gear motor relay; IS–infrared sensor; LF/S–lower oat switch;
LLV–liquid line valve (MLH model); MBC–mechanical bin control;
SLV–suction line valve (MLH model); UF/S–upper oat switch; WV–inlet
water valve
4
2. Sequence Flow Chart
1-beep alarm continues
WV continues
GMR off
GM off
GMPR off
FM off
FMR off
When UF/S closes,
alarm resets and
. Ice Purge Cycle
starts.
90 seconds
Low Water Safety
90 sec. FT exceeded
1-beep alarm sounds
90 sec. PT begins
Rell
FT Maximum
90 seconds
3. Freeze Cycle
FD Sequence Flow Chart
1-in-1 drain cycle. DV opens for seconds every hour
(S1 Dip Switch 4).
Icemaker status does not change.
terminates
PT
UF/S open
WV on
exceeded
FT
LF/S closed
UF/S closed
FT off (90 sec.)
UF/S open
LF/S open (WV on)
CR on
Comp on
FT exceeded
1-beep alarm sounds
CR off
Comp off
LLV off
SLV off
FT off
WV off
CR continues
Comp continues
GMR continues
GM continues
FT started (90 sec.)
WV on
CR continues
Comp continues
GMR continues
GM continues
LLV on
SLV on
GMR continues
GM continues
GMPR continues
FM continues
GMR continues
GM continues
GMPR continues
GMPR continues
FM continues
FMR continues
GMPR continues
FM continues
FMR continues
FMR continues
FM continues
FMR continues
LLV continues
SLV continues
LLV continues
SLV continues
to ". Ice Purge Cycle" above
IS Green LED on
IS Yellow LED off
4. Icemaker Restart
3. Icemaker Off
4. Icemaker Restart
3. 10-Minute
5 minutes
2. Ice Purge Cycle
2. Ice Purge Cycle
to "1. Fill Cycle" above
10-min. DT off (DC only)
DV off (DC only)
1-in-12 DT reset (DC only)
Drain
DV on (DC only)
GMR off
GM off
GMPR off
FM off
IS activated or
DC starts
CR off
Comp off
LLV off
FMR off
SLV off
GMR continues
GM continues
GMPR continues
FM continues
FMR continues
5 minutes
To bypass, press the
"SERVICE" button after
4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle
is recommended, a 1-in-1 drain cycle is available. For 1-in-1 drain
cycle sequence, see "3. 1-in-1 Hour Drain Cycle & Restart (optional)."
GM starts.
2. Ice Purge Cycle
1. Fill Cycle
Power Switch "ON"
30 sec.
Maximum
90 seconds
Control Switch in "ICE"
POWER OK LED on
IS Green LED on
IS Yellow LED off
1. Startup
GMR on
GM on
GMPR on
LF/S closed
UF/S closed
FT off
If Fill > 90 sec. FT
WV on
FT on (90 sec.)
FM on
FMR on
WV off
1-beep alarm sounds
WV continues
When UF/S closes
alarm resets and
5
. Ice Purge Cycle starts.
Note: If IS fails to shutdown the
2. Infrared Sensor Shutdown & Restart
1, , & 3
1. DT Initiates DC
IS Green LED on
1. Bin Full
icemaker, MBC opens and a
9-beep alarm sounds.
IS Yellow LED (ashing or steady)
IS delay determined by S1 dip switch
IS Green LED on
IS Yellow LED off
& Restart (optional)
(S1 dip switch 4)
3. 1-in-12 Drain Cycle
GMR-gear motor relay (X CB)
IS-infrared sensor bin control
LF/S-lower oat switch
LLV-liquid line valve (MLH only)
MBC-mechanical bin control
PT-purge timer
SLV-suction line valve (MLH only)
Legend:
Comp-compressor
CR-compressor relay
DC-drain cycle
DT-drain timer
DV-drain valve
FM-fan motor
FMR-fan motor-remote
UF/S-upper oat switch
WV-water valve
FT-ll timer (low water safety)
GM-gear motor
GMPR-gear motor protect relay
C. Control Board
• A Hoshizaki exclusive control board is employed in FD-1001MAH(-C), FD-1001MWH(-C),
FD-1001MRH(-C), and FD-1001MLH(-C) Modular Flakers.
• All models are pre-tested and factory set.
CAUTION
1. The control board is 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 before handling or replacing the control board.
3. Do not touch the electronic devices on the control board or the back of the
control board to prevent damage to the control board.
4. Do not change wiring and connections. Never misconnect terminals.
5. Do not short out power supply to test for voltage.
6. Always replace the whole control board if it goes bad.
The control board provides the following safeguards:
• High and low voltage protection.
• Provides component protection during low water supply.
• Purges remaining ice in the evaporator.
• Provides short cycle protection for the compressor.
6
1. Control Board Layout
• "COMP" LED
(X1 Relay)
• "GM" LED
(X2 Relay)
GM
FMR
FMS
Comp
LLV
SLV
"F-A" Control Board
• K9 Connector (5VDC)
Control Switch
#1 & # (white/black)
High Pressure Switch
#3 & #4 (yellow)
Gear Motor Protect Relay Circuit
#5 & #6 (white/orange)
• S2 "SERVICE" Button
(Ice Purge Cycle Bypass)
• K1 Connector
(115VAC)
#3 Input (black)
# GM, FMR,
FMS (brown)
• "FLUSH" LED
(X3 Relay) (drain)
DV
• "WTRIN" LED
(X4 Relay)
WV
• K2 Connector
(24VAC)
Drain Valve
#10 (white/blue)
Transformer
Input
#9 (white/red)
Inlet Water Valve
#8 (white/brown)
Transformer
Input
#7 (white/red)
• K8 Connector
(24VAC and 5VDC)
Transformer
4VAC Input
#1 (white/red)
Transfomer
4VAC Neutral
# (light blue)
Mechanical Bin Control
#3 & #4 (gray) (5VDC)
Float Switch
#5 (black) (5VDC)
Upper Float Switch
#6 (red)
Lower Float Switch
#7 (dark blue)
• K7 Connector-Open
• "POWER OK" LED
Water Dispensing
Valve, Agitation
Motor, and Ice
Dispensing LEDs
(not used on this
model)
• J2 Connector-Open
• K3 Connector-Open
• K4 Connector-Open
• K5 Connector-Open
"F-A" Control Board
Part Number
A496-01
7
• S1 Dip Switch
• K6 Connector (20VDC)
Infrared Sensor
(brown (ground))
(white, signal (common))
(dark blue)
2. Features
a) Low Water Safety
When the inlet water valve opens during ll and rell, a 90-second low water safety
timer starts. Once the upper oat switch closes the 90-second low water safety timer
terminates. If the upper oat switch remains open longer than 90 seconds, a 1-beep
alarm sounds. The water valve and 1-beep alarm continue until the upper oat switch
closes.
b) Ice Purge Cycle Bypass
To speed up the diagnostic process, the 5-minute ice purge cycle may be bypassed
by pressing the "SERVICE" button on the control board after the gear motor starts.
WARNING! Risk of electric shock. Care should be taken not to touch live
terminals.
c) Freeze Timer
A 30-minute freeze timer starts once the upper oat switch closes. Should the upper
oat switch fail to close again before the 30-minute timer terminates, the control board
shuts down the icemaker and sounds a 5-beep alarm every 5 seconds. Also, when the
lower oat switch is open and the upper oat switch is closed, the control board sounds
a 5-beep alarm every 5 seconds. Both alarms require a manual reset. For further details,
see "II.C.3.d) Feeze Timer (5-beep alarm)."
d) Drain Frequency
(1) 1-in-1 Drain Cycle: The 1-hour drain timer terminates, then the drain valve energizes
for seconds. This occurs once every hour when the 1-in-1 drain cycle is activated
(S1 dip switch 4 in the "OFF" position (factory default)). This setting is recommended
for optimum icemaker performance. The 1-in-1 drain cycle allows for maximum
drainage of any sediment from the evaporator without interrupting the icemaking
process.
(2) 1-in-12 Drain Cycle (optional): The 1-hour drain timer terminates, then the
icemaker cycles down and the drain valve energizes for 10 minutes. This occurs once
every 1 hours when the 1-in-1 drain cycle is activated (S1 dip switch 4 in the "ON"
position (optional)). For further details, see "II.B.1.d) Drain Cycle."
e) Bin Control Shutdown Delay
(1) Infrared Sensor: The ice level at shutoff may need to be adjusted depending on the
dispenser agitation or dispense method. For a typical dispenser unit application, a
100-second shutdown delay is recommended. Increasing the shutdown delay setting
allows for a higher level of ice in the bin before the icemaker shuts down. When used
with a standard Hoshizaki storage bin, any shutdown delay setting is acceptable. For
further details, see "II.C.4.b) Infrared Sensor Shutdown Delay (S1 dip switch 1, , and
3)."
(2) Mechanical Bin Control: The control board shuts down the entire unit within
10 seconds when the mechanical bin control proximity switch opens (actuator paddle
engaged). For further details, see "II.C.4.f) Mechanical Bin Control Shutdown Delay
(S1 dip switch 8)."
8
f) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by
the high voltage (147Vac±5% or more) and low voltage (9Vac±5% or less) cut-outs.
When high voltage (147Vac±5% or more) is present, the icemaker automatically stops
and the control board signals with a 7-beep alarm every 3 seconds.
When low voltage (9Vac±5% or less) is present, the icemaker automatically stops and
the control board signals with a 6-beep alarm every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
g) LED Lights and Alarm Safeties Chart
The "POWER OK" LED indicates proper control voltage and will remain on unless a
control voltage problem occurs. For further details, see "II.B. Sequence of Operation."
Sequence Step LED
Fill Cycle WTRIN WV - Ice Purge Cycle GM GM, FM/FMR 5 min. 5 min.
Freeze Cycle (with rell) GM, WTRIN* (rell),
COMP
Drain Cycle FLUSH (Drain) DV sec. 10 min.
Energized
Components Min. Max.
GM, Comp,
FM/FMR, LLV,
SLV, WV* (rell)
- *On until UF/S closes.
Alarm sounds after
90 sec.
The built-in alarm safeties shut down the unit.
No. of Beeps
(every 5 sec.)
1 Low Water Safety
UF/S open > 90 seconds after WV energized.
Control Switch
In "DRAIN" position longer than 15 minutes.
3 High Pressure Switch
First and second activation in 1 hour.
4 High Pressure Switch
Third activation in 1 hour.
5 Freeze Timer
WV off > 30 minutes since last WV activation.
6 Low Voltage
(9Vac ±5% or less)
7 High Voltage
(147Vac ±5% or more)
8 Gear Motor
GMPR contacts fail to close.
9 Infrared Sensor (S1 dip switch 7)
MBC actuator paddle engaged.
Type of Alarm Reset Options
Automatic reset once water supply is restored
and UF/S closes.
Automatic reset once the control switch is
moved to the "ICE" position.
Automatic reset once pressure drops below
the high pressure threshold and the high
pressure switch closes.
Call for service. To avoid possible catastrophic
failure, it is recommended to leave the
icemaker off until this alarm is resolved.
Manual reset. Turn power off and on again.
Manual reset. Turn power off and on again.
"POWER OK" LED turns off if voltage
protection operates.
The control voltage safeties automatically
reset when voltage is corrected.
Manual reset. Turn power off and on again.
Manual reset. Turn power off and on again.
Legend: Comp–compressor; DV–drain valve; FM–fan motor; FMR–fan motor-remote;
GM–gear motor; GMPR–gear motor protect relay; LLV-liquid line valve
(MLH model only); MBC–mechanical bin control; SLV–suction line valve (MLH
model only); UF/S–oat switch; WV–inlet water valve
9
3. Alarm Safeties
a) Low Water Safety (1-beep alarm)
(1) Fill Cycle: If upper oat switch remains open 90 seconds after the inlet water valve
has energized, the control board sounds a 1-beep alarm every 5 seconds. The alarm
resets and the icemaker automatically starts running again once water is restored or
the oat switch is cleaned or replaced.
(2) Freeze Cycle/Rell: If upper oat switch remains open 90 seconds after the inlet
water valve energizes, the compressor de-energizes and the control board sounds a
1-beep alarm every 5 seconds. The gear motor continues for another 90 seconds to
clear the ice from the evaporator. The inlet water valve and 1-beep alarm continue
until the upper oat switch closes. The alarm resets and the icemaker automatically
starts running again when the upper oat switch closes.
b) Control Switch in the "DRAIN" Position (2-beep alarm)
When the control switch is left in the "DRAIN" position longer than 15 minutes, the
control board sounds a -beep alarm every 5 seconds. When the control switch is
moved to the "ICE" position, the alarm resets and the icemaker starts running again.
c) High Pressure Switch (3 & 4-beep alarms)
(1) 3-beep alarm: For the rst and second high pressure switch activation in 1 hour,
the icemaker shuts down and the control board sounds a 3-beep alarm every
5 seconds. When the high pressure switch closes, the alarm resets and the icemaker
automatically starts running again.
(2) 4-beep alarm: For the third high pressure switch activation in 1 hour, the icemaker
shuts down and the control board sounds a 4-beep alarm every 5 seconds. This
alarm is to prevent catastrophic failure to the compressor and requires a manual
reset. Before resetting, contact your local Hoshizaki Service Representative. Turn the
power off and then on again to reset the alarm. If the high pressure switch has reset,
the icemaker starts running again.
d) Freeze Timer (5-beep alarm)
The control board starts a 30-minute freeze timer once the upper oat switch closes. As
the water level drops in the reservoir, the upper oat switch opens. Should the upper
oat switch fail to close again before the 30-minute freeze timer terminates, the control
board sounds a 5-beep alarm every 5 seconds. This alarm requires a manual reset.
Turn the power off and then on again to reset the alarm. The icemaker starts running.
Also, when the lower oat switch is open and the upper oat switch is closed, the control
board sounds a 5-beep alarm every 5 seconds. This alarm requires a manual reset.
Turn the power off and then on again to reset the alarm. For further details, see "IV.E.
Float Switch Check."
e) Low Voltage (6-beep alarm)
The minimum allowable power supply voltage of this icemaker is limited by the low
voltage cut-out. When low voltage (9Vac ±5% or less) is present, the "POWER OK"
LED turns off and the control board shuts down the unit and sounds a 6-beep alarm
every 5 seconds. When the proper supply voltage resumes, the icemaker automatically
starts running again.
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