Page 1
Hoshizaki America, Inc.
Hoshizaki
Modular Flaker
“A Superior Degree
of Reliability”
www.hoshizaki.com
Models
F-450MAH(-C)
SERVICE MANUAL
Issued: 8-25-2009
Page 2
IMPORTANT
Only qualified 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 qualified 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 30269
Attn: Hoshizaki Technical Support Department
Phone: 1-800-233-1940 Technical Support
(770) 487-2331
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.
2
Page 3
Please review this manual. It should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians should service and
maintain the icemaker. This manual should be made available to the technician prior to service
or maintenance.
CONTENTS
I. Specifications .................................................................................................................... 4
1. F-450MAH .................................................................................................................... 4
2. F-450MAH-C ................................................................................................................ 5
II. General Information .......................................................................................................... 6
1. Construction .................................................................................................................6
2. Control Box Layout ....................................................................................................... 7
3. Timer Board ..................................................................................................................8
[a] Solid-State Control ................................................................................................ 8
[b] Timer Board ........................................................................................................... 8
[c] Sequence .............................................................................................................. 9
III. Technical Information ..................................................................................................... 12
1. Water Circuit and Refrigeration Circuit........................................................................ 12
2. Wiring Diagram ........................................................................................................... 13
[a] F-450MAH ........................................................................................................... 13
[b] F-450MAH-C ....................................................................................................... 14
3. Sequence of Electrical Circuit .................................................................................... 15
4. Timing Chart ............................................................................................................... 25
5. Performance Data ....................................................................................................... 28
[a] F-450MAH ........................................................................................................... 28
[b] F-450MAH-C ....................................................................................................... 29
IV. Service Diagnosis.......................................................................................................... 30
1. No Ice Production ....................................................................................................... 30
2. Low Ice Production ..................................................................................................... 33
3. Other ........................................................................................................................... 34
V. Removal and Replacement of Components ................................................................... 35
1. Service for Refrigerant Lines ...................................................................................... 35
[a] Refrigerant Recovery........................................................................................... 35
[b] Evacuation and Recharge [R-404A] .................................................................... 35
2. Brazing ....................................................................................................................... 36
3. Removal and Replacement of Compressor ................................................................ 37
4. Removal and Replacement of Drier ........................................................................... 38
5. Removal and Replacement of Expansion Valve......................................................... 39
6. Removal and Replacement of Evaporator Assembly ................................................ 40
7. Removal and Replacement of Fan Motor ................................................................... 42
8. Removal and Replacement of Control Water Valve .................................................... 42
9. Removal and Replacement of Flush Water Valve ....................................................... 43
VI. Cleaning and Maintenance ........................................................................................... 44
1. Preparing the Icemaker for Long Storage ................................................................... 44
2. Cleaning and Sanitizing Instructions .......................................................................... 45
[a] Cleaning Solution ................................................................................................ 45
[b] Cleaning Procedure ............................................................................................ 46
[c] Sanitizing Solution............................................................................................... 47
[d] Sanitizing Procedure - Initial................................................................................ 47
[e] Sanitizing Procedure - Final ................................................................................ 48
3. Maintenance Instructions ............................................................................................ 50
3
Page 4
I. Specifications
1. F-450MAH
AC SUPPLY VOLTAGE 115/60/1
COMPRESSOR 120 V 8.5 RLA 51 LRA
GEAR MOTOR 120 V 1.6 FLA 1/6 HP
FAN MOTOR 115 V 0.85FLA 50W
OTHER 120 V 0.03A
MAXIMUM FUSE SIZE 20 A
MAX. HACR BREAKER (USA ONLY) 20 A
MAX. CIRC. BREAKER (CANADA ONLY) 20 A
MINIMUM CIRCUIT AMPACITY 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *476 (216) 456 (207) 435 (197)
Reference without *marks 80 416 (189) 397 (180) 379 (172)
90 362 (164) *355 (161) 330 (150)
100 315 (143) 301 (137) *282 (128)
SHAPE OF ICE Flake
ICE QUALITY Approx. 70%, 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.) 915 (6.2) 858 (4.3)
POTABLE WATER 43 (12) 57 (12)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 21"-7/8" x 27-3/8" x 21-61/64" (556 x 696 x 557.7mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 150 lbs. ( 68 kg ), Shipping 175 lbs. ( 80 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 ( 1/6 HP Gear Motor )
ICE MAKING WATER CONTROL Float Switch
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Bin Control ( Proximity Sw. )
COMPRESSOR Hermetic, Model RS43C1E-CAA-219
CONDENSER Air-cooled, Fin and tube type
EVAPORATOR Copper Tube on Cylinder
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb. (455 g)
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 Manual reset Circuit Breaker or Fuse
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch and Timer
ACCESSORIES - REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 - 100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
4
Page 5
2. F-450MAH-C
AC SUPPLY VOLTAGE 115/60/1
COMPRESSOR 120 V 8.5 RLA 51 LRA
GEAR MOTOR 120 V 1.6 FLA 1/6 HP
FAN MOTOR 115 V 0.85FLA 50W
OTHER 120 V 0.03A
MAXIMUM FUSE SIZE 20 A
MAX. HACR BREAKER (USA ONLY) 20 A
MAX. CIRC. BREAKER (CANADA ONLY) 20 A
MINIMUM CIRCUIT AMPACITY 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *426 (193) 407 (185) 387 (176)
Reference without *marks 80 368 (167) 350 (159) 333 (151)
90 317 (144) *310 (141) 287 (130)
100 273 (124) 260 (118) *244 (111)
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.) 956 (7.4) 880 (5.0)
POTABLE WATER 37 (12) 51 (12)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 21"-7/8" x 27-3/8" x 21-61/64" (556 x 696 x 557.7mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 150 lbs. ( 68 kg ), Shipping 175 lbs. ( 80 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 ( 1/6 HP Gear Motor )
ICE MAKING WATER CONTROL Float Switch
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Infrared Sensor
COMPRESSOR Hermetic, Model RS43C1E-CAA-219
CONDENSER Air-cooled, Fin and tube type
EVAPORATOR Copper Tube on Cylinder
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb. (455 g)
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 Manual reset Circuit Breaker or Fuse
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch and Timer
ACCESSORIES - REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 - 100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
5
Page 6
II. General Information
1. Construction
Control Water Valve
Water Supply
Inlet
Bin Control
Ice Chute
Evaporator
Flush Water
Valve
Control Box
Gear Motor
Junction Box
Condenser
Fan Motor
Compressor
Drier
6
Page 7
2. Control Box Layout
Note: The above component names are identical with the wiring label, but not with
the parts list.
7
Page 8
3. Timer Board
[a] Solid-State Control
1) A HOSHIZAKI exclusive solid-state control is employed in the self-contained flaker
icemakers.
2) A printed circuit board (hereafter called “timer board”) includes a stable and high
quality control system.
3) All models are pre-tested and factory-adjusted.
[b] Timer Board
CAUTION
1. Fragile, handle very carefully.
2. A timer board contains CMOS (Complementary Metal-Oxide Semiconductor) integrated circuits, which are susceptible to failure due to static
discharge. It is especially important to use an anti-static wrist strap when
handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the
board to prevent damage to the board.
4. Do not change wiring and connections. Especially, never misconnect
terminals.
5. Do not fix the electronic devices or parts on the board in the field. Always
replace the whole board assembly when it goes bad.
The icemaker is controlled by the timer board for the following purposes:
1) To prevent the gear motor and the compressor from starting or stopping
simultaneously.
2) To reduce remaining ice in the refrigeration casing.
3) To protect the unit in case of low water and low water pressure.
4) To protect the unit in case the bin control causes chattering.
8
Page 9
[c] Sequence
Fig. 1
Fig. 2
9
Page 10
EDOCTRAP10-503734
LEDOM10C441AA2H
GNITARzH06/05CAV42
1T.ces51±06
2T.ces22±09
3T.ces54±051
4Tsselro.ces1
5T%07±.ces7.6
6T%07±.ces7.6
Fig. 3
10
Page 11
Functions of Terminals
1) Terminals 1, 2
Power supply AC 24V.
2) Terminals 3, 4
Control X1 (GM) and X2 (CM) Relays.
When closed, energize X1 (GM) in 1 sec. and X2 (CM) in 60 sec.
When opened, de-energize X
1 (GM) in 150 sec. and X2 (CM) in 90 sec.
3) Terminals 5, 6
Control X
1 (GM) and X2 (CM) Relays.
When opened, de-energize X1 (GM) and X2 (CM) immediately.
When closed again, energize X1 (GM) in 1 sec. and X2 (CM) in 60 sec.
4) Terminals 7, 8, 9
X1 (GM) contacts.
8 is a movable contact, 7 is a make contact, and 9 is a break contact.
5) Terminals 10, 11
Control X2 (CM) Relays.
When opened, de-energize X2 (CM) immediately.
When closed, energize X2 (CM) immediately.
Note: 1. X2 Relay is a single pole, normally open relay, and its terminals are mounted
on the relay itself.
2. The above operation times are median. See Fig. 3 for details.
11
Page 12
III. Technical Information
1. Water Circuit and Refrigeration Circuit
12
Page 13
2. Wiring Diagram
[a] F-450MAH
13
Page 14
[b] F-450MAH-C
14
Page 15
3. Sequence of Electrical Circuit
[a] When power switch is moved to “ON” position and flush switch to “ICE” position,
water starts to be supplied to reservoir.
15
Page 16
[b] When reservoir has been filled, gear motor starts immediately.
16
Page 17
[c] Compressor starts about 60 sec. after gear motor starts.
17
Page 18
[d] Bin control operates, and about 6 sec. later, compressor and gear motor stop
simultaneously.
18
Page 19
[e] Low water (except water-cooled model).
19
Page 20
[f] When flush switch is moved to “FLUSH” position, flush water valve opens and
flushes reservoir and evaporator.
20
Page 21
[g] When flush timer operates (for 21 min. every 12 hours), flush water valve opens
and flushes reservoir and evaporator.
21
Page 22
[h] When 208-230V are supplied to circuit protect relay, it protects the circuit from being
miswired. If the power supply is properly connected, the contact of circuit protect
relay does not move even when the coil is energized.
22
Page 23
[i] When pressure switch opens, power supply to the control board is cut off causing the
compressor and gear motor to turn off immediately.
23
Page 24
[j] When input voltage is too low (less than 70%) gear motor fuse (1.5A) is blown
causing compressor and gear motor to turn off immediately.
24
Page 25
4. Timing Chart
1. CIRCUIT PROTECT
RELAY
2. WATER LEVEL
ON
OFF
UPPER
LOWER
BOTTOM
Miswiring. Circuit Protect Relay operates.
Proper wiring. The unit starts.
BIN CONTROL
OFF ON
UPPER
3. FLOAT
SWITCH
LOWER
4. WATER CONTROL
RELAY
5. CONTROL WATER
VALV E
6. FLUSH TIMER
7. FLUSH SWITCH
8. FLUSH WATER
VALV E
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1 - 2
2 - 3
FLUSH
ICE
ON
OFF
9. BIN CONTROL
10. GEAR MOTOR
RELAY
11. GEAR MOTOR
12. FAN MOTOR
13. COMPRESSOR
14. PRESSURE
SWITCH
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1 sec
60 sec
6 sec 1 sec
60 sec
25
Page 26
LOW WATER
FLUSH TIMER
1. CIRCUIT PROTECT
RELAY
2. WATER LEVEL
UPPER
3. FLOAT
SWITCH
LOWER
4. WATER CONTROL
RELAY
5. CONTROL WATER
VALV E
6. FLUSH TIMER
7. FLUSH SWITCH
ON
OFF
UPPER
LOWER
BOTTOM
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1 - 2
2 - 3
FLUSH
ICE
21 min every 12 hr
8. FLUSH WATER
VALV E
9. BIN CONTROL
10. GEAR MOTOR
RELAY
11. GEAR MOTOR
12. FAN MOTOR
13. COMPRESSOR
14. PRESSURE
SWITCH
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
150 sec
90 sec 60 sec 90 sec 60 sec
1 sec
150 sec
1 sec
26
Page 27
FLUSH
FLUSH SWITCH PRESSURE SWITCH
ICE
OFF ON
1. CIRCUIT PROTECT
RELAY
2. WATER LEVEL
UPPER
3. FLOAT
SWITCH
LOWER
4. WATER CONTROL
RELAY
5. CONTROL WATER
VALV E
6. FLUSH TIMER
ON
OFF
UPPER
LOWER
BOTTOM
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1 - 2
2 - 3
7. FLUSH SWITCH
8. FLUSH WATER
VALV E
9. BIN CONTROL
10. GEAR MOTOR
RELAY
11. GEAR MOTOR
12. FAN MOTOR
13. COMPRESSOR
FLUSH
ICE
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
150 sec
90 sec 60 sec
1 sec
1 sec
60 sec
14. PRESSURE
SWITCH
ON
OFF
27
Page 28
5. Performance Data
[a] F-450MAH
APPROXIMATE Ambient
ICE PRODUCTION Temp. (°F)
PER 24 HR. 70 484 220
80 424 192 406 184 389 176
90 372 169 362 164 341 155
lbs./day kg/day
APPROXIMATE ELECTRIC 70 879 -- 885 -- 890 -CONSUMPTION 80 896 -- 901 -- 907 --
watts 100 937 -- 947 -- 956 -APPROXIMATE WATER 70 0 0
CONSUMPTION PER 24 HR. 80 53 201 51 192 49 184
gal./day l/day
EVAPORATOR OUTLET TEMP 70 3 -16 3 -16 3 -16
°F °C
HEAD PRESSURE 70 225 15.8 225 15.8 225 15.8
PSIG kg/cm²G
SUCTION PRESSURE 70 28 2.0 28 2.0 28 2.0
PSIG kg/cm²G
TOTAL HEAT OF REJECTION 4724 BTU/h (AT 90°F /WT 70°F)
100 327 148 313 142 294 133
90 912 -- 918 -- 928 --
90 47 176 45 169 43 164
100 41 155 39 148 38 142
80 3 -16 7 -14 7 -14
90 7 -14 7 -14 9 -13
100 9 -13 9 -13 9 -13
80 256 18.0 256 18.0 256 18.0
90 286 20.1 286 20.1 286 20.1
100 324 22.8 324 22.8 324 22.8
80 31 2.1 31 2.1 31 2.1
90 33 2.3 33 2.3 33 2.3
100 37 2.6 37 2.6 37 2.6
50 70 90
Water Temp. (°F)
462 209 442 201
58 220 55 209
We reserve the right to make changes in specifications and design without prior notice.
28
Page 29
[b] F-450MAH-C
APPROXIMATE Ambient
ICE PRODUCTION Temp. (°F)
PER 24 HR. 70 430 195
80 380 170 365 165 350 160
90 135 150 325 150 310 140
lbs./day kg/day
APPROXIMATE ELECTRIC 70 883 -- 891 -- 898 -CONSUMPTION 80 906 -- 913 -- 921 --
watts 100 953 -- 961 -- 964 -APPROXIMATE WATER 70 52 195
CONSUMPTION PER 24 HR. 80 46 170 44 165 42 160
gal./day l/day
EVAPORATOR OUTLET TEMP 70 3 -16 3 -16 3 -16
°F °C
HEAD PRESSURE 70 225 15.8 225 15.8 225 15.8
PSIG kg/cm²G
SUCTION PRESSURE 70 28 2 28 2 28 2
PSIG kg/cm²G
TOTAL HEAT OF REJECTION 5150 BTU/h (AT 90°F /WT 70°F)
100 300 135 290 130 270 120
90 928 -- 936 -- 944 --
90 16 150 39 150 37 140
100 36 135 35 130 32 120
80 3 -16 9 -13 9 -13
90 9 -13 9 -13 12 -11
100 12 -11 12 -11 123 -11
80 257 18.1 257 18.1 257 18.1
90 289 20.3 289 20.3 289 20.3
100 325 22.8 325 22.8 325 22.8
80 31 2.2 2 2.2 31 2.2
90 34 2.4 2.2 2.4 34 2.4
100 37 2.6 37 2.6 37 2.6
50 70 90
Water Temp. (°F)
410 185 395 180
49 185 47 180
We reserve the right to make changes in specifications and design without prior notice.
29
Page 30
IV. Service Diagnosis
1. No Ice Production
PROBLEM POSSIBLE CAUSE REMEDY
[1] The icemaker will
not start.
[2] Water does not
stop, and the
icemaker will not
start
[3] Water has been
supplied, but the
icemaker will not
start.
a) Power Supply 1. OFF position. 1. Move to ON position.
2. Loose connection. 2. Tighten.
3. Bad contacts. 3. Check for continuity
and replace.
4. Blown fuse. 4. Replace.
b) Power Switch
(Control Box)
c) Fuse (Control Box) 1. Blown out. 1. Check for short circuit
d) Circuit Protect Relay 1. Miswiring. 1. Check power supply
e) Flush Timer 1. Flushing out. 1. Wait for 21 minutes.
f) Flush Switch 1. FLUSH position. 1. Move to ICE position.
g) Transformer 1. Coil winding opened. 1. Replace.
h) Control Water Valve 1. Coil winding opened. 1. Replace.
i) Shut-off Valve 1. Closed. 1. Open.
j) Plug and Receptacle
(Control Box)
a) Water Control Relay 1. Contacts fused. 1. Replace.
b) Float Switch 1. Bad contacts. 1. Check for continuity
c) Flush Water Valve 1. Valve seat clogged
d) Hoses 1. Disconnected. 1. Connect.
a) Water Control Relay 1. Bad contacts. 1. Check for continuity
b) Bin Control 1. Bad contacts. 1. Check for continuity
1. Off position. 1. Move to ON position.
2. Bad contacts. 2. Check for continuity
and replace.
and replace.
voltage and wire
properly.
2. Bad contacts. 2. Check for continuity
and replace.
2. Bad contacts. 2. Check for continuity
and replace.
2. Water failure. 2. Wait till water is
supplied.
1. Disconnected. 1. Connect.
2. Terminal out of Plug
or Receptacle.
2. Coil winding opened. 2. Replace.
2. Float does not move
freely.
and water leaking.
2. Activator does not
move freely.
2. Insert Terminal back in
position
and replace.
2. Clean or replace.
1. Clean or replace
and replace.
and replace.
2. Clean Axle and its
corresponding holes
or replace Bin Control.
30
Page 31
PROBLEM POSSIBLE CAUSE REMEDY
c) Gear Motor Relay 1. Coil winding opened. 1. Replace.
2. Bad contacts. 2. Check for continuity
and replace.
[4] Water has been
supplied. Fan Motor
starts, but
Compressor and
Gear Motor will not
start.
[5] Gear Motor starts,
but Compressor will
not start or operates
intermittently
[6] Gear Motor and
Compressor start,
but operate
intermittently
d) Control Timer
(Printed Circuit
Board)
e) Gear Motor Protect
Relay
a) Gear Motor Fuse
(Bussman GMD
1.5A)
b) Thermal Protector
(Gear Motor)
a)
X2 Relay on Control
Timer
b) Starter 1. Bad contacts. 1. Check for continuity
c) Start Capacitor or
Run Capacitor
d) Compressor 1. Loose connections. 1. Tighten.
e) Power Supply 1. Circuit Ampacity too
a) Pressure Switch 1. Dirty Air Filter or
1. Broken. 1. Replace.
1. Coil winding opened. 1. Replace.
2. Bad contacts. 2. Check for continuity
and replace.
1. Blown Fuse. 1. See 3. [3]. Find out the
cause and replace the
Fuse.
2. Bad contacts. 2. Check for continuity
and replace.
1. Bad contacts. 1. Check for continuity
and replace.
2. Coil winding opened. 2. Replace Timer.
and replace.
2. Coil winding opened. 2. Replace.
3. Loose connections. 3. Tighten.
1. Defective. 1. Replace.
2. Motor winding
opened or grounded.
3. Motor Protector
tripped.
low.
Condenser.
2. Ambient temperature
too warm.
3. Fan not rotating. 3. See "3. [1] a) Fan
4. Refrigerant
overcharged.
5. Refrigerant line or
components plugged.
2. Replace.
3. Find out the cause of
overheat or
overcurrent.
1. Install a larger-sized
conductor.
1. Clean.
2. Get cooler.
Motor."
4. Recharge.
5. Clean and replace
drier.
6. Bad contacts. 6. Check for continuity
and replace.
7. Loose connections. 7. Tighten.
31
Page 32
PROBLEM POSSIBLE CAUSE REMEDY
[7] Gear Motor and
Compressor start
but no ice is
produced.
a) Refrigerant Line 1. Gas leaks. 1. Check for leaks with a
leak detector. Reweld
leak, replace drier and
charge with
refrigerant. The
amount of refrigerant
is marked on
Nameplate or Label.
b) Shut-off Valves on
Condensing Unit
2. Refrigerant line
clogged.
1. Closed. 1. Open.
2. Replace the clogged
component.
32
Page 33
2. Low Ice Production
PROBLEM POSSIBLE CAUSE REMEDY
[1] Low ice production a) Refrigerant Line 1. Gas leaks. 1. See "1. [5] a)
Refrigerant Line."
b) High-side Pressure
Too High
2. Refrigerant line
clogged.
3. Overcharged. 3. Recharge.
1. Dirty Air Filter or
Condenser.
2. Ambient temperature
too warm.
2. Replace the clogged
component.
1. Clean.
2. Get cooler.
c) Expansion Valve
(not adjustable)
3. Fan rotating too
slow.
4. Condensing unit out
of order.
1. Low-side pressure
too low.
2. Low-side pressure
too high.
3. See "3 [1] a) Fan
Motor."
4. Check condensing
unit.
1. Replace.
2. See if Expansion
Valve Bulb is mounted
properly, and replace
the valve if necessary.
33
Page 34
3. Other
PROBLEM POSSIBLE CAUSE REMEDY
[1] Abnormal noise a) Fan Motor 1. Bearing worn out. 1. Replace.
2. Fan blade deformed. 2. Replace fan blade.
[2] Overflow from
Reservoir (Water
does not stop.)
[3] Gear Motor Fuse
blows or circuit
breaker trips
frequently
3. Fan blade does not
move freely.
b) Compressor 1. Bearings worn out,
or cylinder valve
broken.
2. Mounting pad out of
position.
c) Refrigerant Lines 1. Rub or touch lines or
other surfaces.
d) Gear Motor (Ice
Making)
e) Evaporator 1. Low-side pressure
a) Water Supply 1. Water pressure too
b) Control Water Valve 1. Diaphragm does not
c) Float Switch 1. Bad contacts. 1. Check for continuity
a) Power Supply
Voltage
b) Evaporator Assy 1. Bearings or Auger
c) Bin Control 1. Bad contacts. 1. Check for continuity
1. Bearing or Gear
worn out / damaged.
too low.
2. Scale on inside wall
of Freezing Cylinder.
high.
close.
1. Too high or too low. 1. Connect the unit to a
worn out.
2. Activator does not
move freely.
3. Replace.
1. Replace.
2. Reinstall.
1. Replace.
1. Replace.
1. See if Expansion
Valve Bulb is mounted
properly, and replace
the valve if necessary.
2. Remove Auger. Use
"SCALE AWAY" or
"LIME-A-WAY"
solution to clean
periodically. If the
water is found hard by
testing, install a
softener.
1. Install a pressure
Reducing Valve
1. Clean or replace.
and replace.
power supply of
proper voltage.
1. Replace Bearing or
Auger.
and replace.
2. Clean Axle and its
corresponding holes
or replace Bin Control.
34
Page 35
V. Removal and Replacement of Components
IMPORTANT
1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture
quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.
2. Always install a new filter drier every time the sealed refrigeration system
is opened.
3. Do not leave the system open for longer than 15 minutes when replacing
or servicing parts.
1. Service for Refrigerant Lines
[a] Refrigerant Recovery
The icemaker unit is provided with two refrigerant access valves - one on the low-side and
one on the high-side line. Using proper refrigerant practices recover the refrigerant from the
access valves and store it in an approved container. Do not discharge the refrigerant into
the atmosphere.
[b] Evacuation and Recharge [R-404A]
1) Attach charging hoses, a service manifold and a vacuum pump to the system. Be sure
to connect charging hoses to both high-side and low-side access valves.
IMPORTANT
The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.
2) Turn on the vacuum pump. Never allow the oil in the vacuum pump to flow backward.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period
depends on pump capacity.
4) Close the low-side valve and high-side valve on the service manifold.
5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-side
line. Remember to loosen the connection, and purge the air from the hose. See the
nameplate for the required refrigerant charge. Hoshizaki recommends only virgin
refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.
35
Page 36
6) A liquid charge is recommended for charging an R-404A system. Invert the service
cylinder. Open the high-side, service manifold valve.
7) Allow the system to charge with liquid until the pressures balance.
8) If necessary, add any remaining charge to the system through the low-side. Use a
throttling valve or liquid dispensing device to add the remaining liquid charge
through the low-side access port with the unit running.
9) Close the two refrigerant access valves, and disconnect the hoses and service
manifold.
10) Cap the access valves to prevent a possible leak.
2. Brazing
WARNING
1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176°F.
2. Refrigerant R-404A itself is not explosive or poisonous. However, when
exposed to high temperatures (open flames) R-404A can be
decomposed to form hydrofluoric acid and carbonyl fluoride both of
which are hazardous.
3. Always recover the refrigerant and store it in an approved container. Do
not discharge the refrigerant into the atmosphere.
4. Do not use silver alloy or copper alloy containing arsenic.
5. Do not use R-404A as a mixture with pressurized air for leak testing.
Refrigerant leaks can be detected by charging the unit with a little
refrigerant, raising the pressure with nitrogen and using an electronic
leak detector.
Note: All brazing-connections are clear-paint coated. Sandpaper the brazing-connec
tions before unbrazing the components. Use a good abrasive cloth to remove
coating.
36
Page 37
3. Removal and Replacement of Compressor
IMPORTANT
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.
1) Unplug the icemaker.
2) Remove the panels.
2) Remove the terminal cover on the compressor, and disconnect the compressor
wiring.
3) Recover the refrigerant and store it in an approved container, if required by an
applicable law.
4) Remove the discharge, suction, and access pipes from the compressor using
brazing equipment.
WARNING
When repairing a refrigerant system, be careful not to let the burner flame
contact any electrical wires or insulation.
5) Remove the bolts and rubber grommets.
6) Slide and remove the compressor. Unpack the new compressor package. Install
the new compressor.
7) Attach the rubber grommets of the prior compressor.
8) Sandpaper the discharge, suction and access pipes.
9) Place the compressor in position, and secure it using the bolts.
10) Remove plugs from the discharge, suction and access pipes.
11) Braze the access, suction and discharge lines (Do not change this order),
while purging with nitrogen gas flowing at the pressure of 3-4 PSIG.
12) Install the new drier.
37
Page 38
13) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
14) Evacuate the system, and charge it with refrigerant. See the nameplate for the
required refrigerant charge and type.
15) Connect the terminals to the compressor, and replace the terminal cover in its
correct position.
16) Replace the panels in their correct position.
17) Plug in the icemaker.
4. Removal and Replacement of Drier
IMPORTANT
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.
1) Unplug the icemaker.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container, if required by an
applicable law.
4) Remove the drier using brazing equipment.
5) Install the new drier with the arrow on the drier in the direction of the refrigerant flow.
Use nitrogen gas at the pressure of 3-4 PSIG when brazing the tubings.
6) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
7) Evacuate the system, and charge it with refrigerant. See the nameplate for the
required refrigerant charge and type.
8) Replace the panels in their correct position.
9) Plug in the icemaker.
38
Page 39
5. Removal and Replacement of Expansion Valve
IMPORTANT
Sometimes moisture in the refrigerant circuit exceeds the drier capacity
and freezes up at the expansion valve. Always install a new drier every
time the sealed refrigeration system is opened. Do not replace the drier
until after all other repairs or replacement have been made.
1) Unplug the icemaker.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container, if required by an
applicable law.
4) Remove the expansion valve bulb at the evaporator outlet.
5) Remove the expansion valve cover, and remove the expansion valve using
brazing equipment.
6) Braze the new expansion valve with nitrogen gas flowing at the pressure of 3-4
PSIG.
WARNING
Always protect the valve body by using a damp cloth to prevent the valve
from overheating. Do not braze with the valve body exceeding 250°F.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system. Charge it with refrigerant. See the nameplate for the required
refrigerant charge and type.
10) Attach the bulb to the suction line. Be sure to secure the bulb using a band and
to insulate it.
11) Place the expansion valve cover in position.
12) Replace the panels in their correct position.
13) Plug in the icemaker.
39
Page 40
6. Removal and Replacement of Evaporator Assembly
1) Drain the water from the evaporator by switching the flush switch to “FLUSH” on the
control box.
2) Unplug the icemaker.
3) Remove the panels.
4) Remove the three thumbscrews and take off the spout from the evaporator.
Cutter
5) Loosen the cutter by a wrench and remove it.
6) Remove the cylinder gasket at the top of the evaporator.
Extruding Head
7) Remove the three socket head cap screws and lift off the extruding head.
8) Replace the bearing inside the extruding head if it exceeds the wear tolerance of
0.02” or is scratched.
Note: Replacing the bearing requires a bearing press adaptor. If it is not available,
replace the whole extruding head.
Auger
9) Lift out the auger. If the area in contact with the bearing is worn or the blade is
scratched, replace the auger.
Evaporator
Note: Skip the following steps 10) through 12) when the evaporator does not need
replacement.
10) Recover the refrigerant and store it in an approved container, if required by an
applicable law.
IMPORTANT
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.
40
Page 41
11) Remove the bulb of the expansion valve.
12) Disconnect the brazing-connections of the expansion valve and the copper tube-
low side from the evaporator, using brazing equipment.
13) Remove the two truss head machine screws and the bracket securing the
evaporator.
14) Disconnect the three hoses from the evaporator.
15) Remove the four socket head cap screws securing the evaporator with the
bearing-lower.
16) Lift off the evaporator.
Bearing-Lower and Mechanical Seal
17) The mechanical seal consists of two parts. One moves along with the auger, and the
other is fixed on the bearing-lower. If the contact surfaces of these two parts are worn
or scratched, the mechanical seal may cause water leaks and should be
replaced.
18) Remove the O-ring on the bearing-lower.
19) Remove the four bolts and the bearing-lower from the gear motor. Replace the
bearing inside the bearing-lower, if it exceeds the wear tolerance of 0.02" or is
scratched.
Note: Replacing the bearing requires a bearing press adaptor. If it is not available,
replace the whole bearing-lower.
Gear Motor
20) Remove the coupling-spline on the gear motor shaft.
21) Remove the three bolts securing the gear motor.
22) Assemble the removed parts in the reverse order of the above procedure.
WARNING
Be careful not to scratch the surface of the O-ring, or it may cause water
leaks. Handle the mechanical seal with care not to scratch nor to
contaminate its contact surface.
41
Page 42
23) When replacing the evaporator:
(a) Braze the new evaporator with nitrogen gas flowing at the pressure of 3-4 PSIG.
(b) Replace the drier.
(c) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
(d) Evacuate the system. Charge it with refrigerant. See the nameplate for required
refrigerant charge and type.
24) Replace the panels in their correct position.
25) Plug in the icemaker.
7. Removal and Replacement of Fan Motor
1) Unplug the icemaker.
2) Remove the panels.
3) Remove the wire connectors from the fan motor leads.
4) Remove the fan motor bracket and fan motor.
5) Install the new fan motor.
6) Replace the fan motor bracket and the wire connectors.
7) Replace the panels in their correct position
8) Plug in the icemaker.
8. Removal and Replacement of Control Water Valve
1) Unplug the icemaker.
2) Remove the panels.
3) Close the water supply line shut-off valve.
4) Disconnect the terminal from the control water valve.
5) Loosen the fitting nut on the control water valve Inlets, and remove the control water
valve. Do not lose the packings inside the fitting nut.
42
Page 43
6) Remove the water supply hose from the control water valve.
7) Install the new control water valve.
8) Assemble the removed parts in the reverse order of the above procedure.
9) Open the water supply line shut-off valve.
10) Check for water leaks.
11) Replace the panels in their correct position.
12) Plug in the icemaker.
9. Removal and Replacement of Flush Water Valve
1) Turn off the power supply.
2) Remove the panels.
3) Close the water supply line shut-off valve.
4) Remove the clamp and disconnect the hose from the flush water valve that attaches to
the evaporator.
Note: Water may still remain inside the evaporator. Be sure to drain the water into the
drain pan.
5) Disconnect the flush water valve from the tube connected to the plastic tee leading to
the drain hose.
6) Disconnect the terminals from the flush water valve.
7) Remove the flush water valve from the frame or bracket.
8) Connect the new flush water valve back onto the frame or bracket.
9) Connect the tube from the plastic tee to the new flush water valve.
10) Connect the hose to the flush water valve and secure it with the clamp.
11) Pour water into the reservoir, and check for water leaks on the flush water valve.
12) Open the water supply line shut-off valve.
13) Turn on the power supply.
43
Page 44
14) Move the flush switch to the “ICE” position.
15) Check for water leaks.
16) Move the flush switch to the “FLUSH” position, and make sure water is flushing.
17) Move the flush switch to the “ICE” position.
18) Replace the panels in their correct position.
VI. Cleaning and Maintenance
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after
any maintenance or cleaning is done to the equipment.
1. Preparing the Icemaker for Long Storage
WARNING
When shutting off the icemaker for an extended time, drain out all water from
the water line and remove the ice from the storage bin. The storage bin should
be cleaned and dried. Drain the icemaker to prevent damage to the water
supply line at sub-freezing temperatures, using air or carbon dioxide. Shut off
the icemaker until the proper ambient temperature is resumed.
1) Run the icemaker with the water supply line shut-off valve closed.
2) Open the drain valve and blow out the water inlet line by using air pressure.
3) Turn off the power supply.
4) Remove the front panel.
5) Move the flush switch on the control box to
the “FLUSH” position.
6) Turn on the power supply, and then drain out all
water from the water line.
7) Turn off the power supply.
8) Turn off the power switch on the control box.
44
Page 45
9) Replace the front panel in its correct position.
10) Close the drain valve.
11) Remove all ice from the storage bin, and
clean the bin.
2. Cleaning and Sanitizing Instructions
WARNING
1. HOSHIZAKI recommends cleaning this unit at least twice a year. More
frequent cleaning, however, may be required in some existing water
conditions.
2. To prevent injury to individuals and damage to the icemaker, do not use
ammonia type cleaners.
3. Always wear liquid-proof gloves to prevent the cleaning and sanitizing
solutions from coming into contact with skin.
[a] Cleaning Solution
Dilute 4.8 fl. oz. (142 ml) of recommended cleaner Hoshizaki “Scale Away” or
“LIME-A-WAY” (Economics Laboratory, Inc.) with 0.8 gallons (3 l) of warm water. This is a
minimum amount. Make more solution if necessary.
IMPORTANT
For safety and maximum effectiveness, use the solution immediately after
dilution.
45
Page 46
[b] Cleaning Procedure
The cleaning process will remove lime deposits from the water system.
1) Remove the front panel and top panel, then turn off the power supply.
2) Close the water supply line shut-off valve.
3) Remove all ice from the storage bin.
4) Move the flush switch to the “FLUSH” position.
5) Turn on the power supply and drain out all water from the water line.
6) Turn off the power supply.
7) Remove the strap connecting the spout to the chute assembly.
8) Remove the thumbscrews securing the spout and lift it off.
9) Pour the cleaning solution over the extruding head until the evaporator assembly and the
reservoir are filled and the solution starts to overflow into the drain pan.
Note: If there is excess scale on the extruding head, fill the evaporator assembly and
reservoir as described above, then use a clamp on the reservoir hose between the
reservoir and evaporator assembly to block flow. Pour additional cleaning fluid
over the extruding head until the evaporator assembly is completely full.
10) Replace the spout and strap in their correct positions.
11) Allow the icemaker to sit for about 10 minutes before operation. If you placed a clamp on
the reservoir hose in step 9, remove it before operation.
12) Move the flush switch to the “ICE” position, then turn on the power supply. Replace the
top panel and front panel in their correct positions. Make ice using the solution until the
icemaker stops making ice.
13) Remove the front panel.
14) Move the flush switch to the “FLUSH” position to drain the remainder of the solution.
15) After the solution is drained, move the flush switch to the “ICE” position.
16) Replace the front panel in its correct position.
17) Open the water supply line shut-off valve and supply water to the reservoir.
18) When the gear motor starts, remove the front panel and turn off the power supply.
19) Drain out all water from the water line. See 4) through 6).
46
Page 47
[c] Sanitizing Solution
Dilute 2.5 fl. oz. (74 ml or 5 tbs) of IMS-II Sanitizer or a 5.25% sodium hypochlorite solution
(chlorine bleach) with 5 gallons (19 l) of warm water.
IMPORTANT
For safety and maximum effectiveness, use the solution immediately after
dilution.
[d] Sanitizing Procedure - Initial
The sanitizing process will sanitize the icemaker.
1) Close the water supply line shut-off valve.
2) Remove the strap connecting the spout to the chute assembly.
3) Remove the thumbscrews securing the spout and lift it off. Remove the rubber O-ring and
nylon O-ring at the top of the cylinder and also remove the packing between the spout
and the chute.
4) Pour the sanitizing solution over the extruding head until the evaporator assembly and
the reservoir are filled and the solution starts to overflow into the drain pan.
5) Remove the two thumbscrews securing the proximity switch to the chute assembly.
6) Remove the chute assembly from the icemaker.
7) Remove the packing at the bottom of the ice chute.
8) Remove the three ties and the chute insulation.
9) Remove the six wing nuts and two baffles.
10) Remove the two thumbscrews, the plate and the packing from the top of the ice chute,
then remove the bin control assembly by sliding it slightly toward the chute opening and
lifting it off.
11) Disassemble the bin control assembly by removing the two snap pins, shaft and
actuator.
12) Soak the removed parts in .25 gallons (1 l) of sanitizing solution for 10 minutes then
wipe them down.
13) Rinse the parts thoroughly.
If the solution is left on these parts, they will rust.
IMPORTANT
47
Page 48
14) Replace all parts in their correct positions.
IMPORTANT
When installing the baffles, make sure that the bent surface (the one without the
studs) faces the actuator so that the bent surface can guide the ice to the center
of the actuator.
15) Move the flush switch to the “ICE” position, then turn on the power supply. Replace the
top panel and front panel in their correct positions. Make ice using the solution until the
icemaker stops making ice.
[e] Sanitizing Procedure - Final
1) Remove the front panel and top panel, then turn off the power supply.
2) Move the flush switch to the “FLUSH” position.
3) Turn on the power supply and drain out all water from the water line.
4) Turn off the power supply.
5) Remove the strap connecting the spout to the chute assembly.
6) Remove the thumbscrews securing the spout and lift it off.
7) Pour the sanitizing solution over the extruding head until the evaporator assembly and
the reservoir are filled and the solution starts to overflow into the drain pan.
8) Replace the spout and strap in their correct positions.
9) Allow the icemaker to sit for about 10 minutes before operation.
10) Move the flush switch to the “ICE” position, then turn on the power supply. Replace the
top panel and front panel in their correct positions. Make ice using the solution until the
icemaker stops making ice.
11) Remove the front panel.
12) Move the flush switch to the “FLUSH” position to drain the remainder of the solution.
13) After the solution is drained, move the flush switch to the “ICE” position.
14) Replace the front panel in its correct position.
15) Open the water supply line shut-off valve and supply water to the reservoir.
48
Page 49
16) When the gear motor starts, remove the front panel and turn off the power supply.
17) Drain out all water from the water line. See 2) and 3).
18) Move the flush switch to the “ICE” position and run the icemaker.
19) Turn off the power supply after 30 minutes.
20) Pour warm water into the storage bin to melt all ice, and then clean the bin liner with the
solution.
21) Flush out any solution from the storage bin.
22) Turn on the power supply and start the automatic icemaking process.
IMPORTANT
1. After cleaning, do not use ice made from the sanitizing solution. Be careful
not to leave any solution in the storage bin.
2. Follow carefully any instructions provided with the bottles of cleaning or
sanitizing solution.
3. Never run the icemaker when the reservoir is empty.
49
Page 50
3. Maintenance Instructions
1. This icemaker must be maintained individually, referring to the instruction
manual and labels provided with the icemaker.
2. To have the optimum performance of this icemaker, the following
consumable parts need periodic inspection, maintenance and
replacement:
Extruding Head
Housing
Gear Motor
Auger
Mechanical Seal
These parts should be inspected at least once a year or every 10,000 hours of
operation. Their service life, however, depends on water quality and
environment. More frequent inspection and maintenance are recommended.
IMPORTANT
Consult with your local distributor about inspection and maintenance service.
To obtain the name and phone number of your local distributor, call Hoshizaki
Technical Support at 1-800-233-1940 in the USA.
1) Stainless Steel Exterior
To prevent corrosion, wipe the exterior occasionally with a clean and soft cloth. Use a
damp cloth containing a neutral cleaner to wipe off oil or dirt build up.
2) Storage Bin and Scoop
• Wash your hands before removing ice. Use the plastic scoop provided (bin accessory).
• The storage bin is for ice use only. Do not store anything else in the bin.
• Keep the scoop clean. Clean using a neutral cleaner and rinse thoroughly.
• Clean the bin liner using a neutral cleaner. Rinse thoroughly after cleaning.
50
Page 51
3) Air Filter
A plastic mesh air filter removes dirt or dust from the air, and keeps the condenser
from getting clogged. As the filter gets clogged, the icemaker’s performance will be
reduced. Check the filter at least twice a month. When clogged, use warm water and
a neutral cleaner to wash the filter.
4) Condenser
Check the condenser once a year, and clean if required by using a brush or vacuum
cleaner. More frequent cleaning may be required depending on the location of the
icemaker.
5) Infrared Sensor ( -C model only )
The infrared sensor inside the ice chute can be accessed by opening the bin door
and reaching into the chute from below the ice machine. Clean the sensor using a
neutral cleaner on a clean soft cloth at least twice a month.
51
Loading...