NO.:
ISSUED:
REVISED:
73083
MAR. 19, 1999
DEC. 15, 2003
HOSHIZAKI
MODULAR CRESCENT CUBER
MODELS
KM-900MAF
KM-900MWF
KM-900MRF
KM-900MRF3
SERVICE MANUAL
IMPORTANT
Only qualified service technicians should attempt to service or maintain this icemaker.
No service or maintenance should be undertaken until the technician has thoroughly
read this Service Manual.
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 or write to the HOSHIZAKI Technical Support Department for
assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City , GA 30269
Attn: HOSHIZAKI T echnical Support Department
Phone: 1-800-233-1940 T echnical Service
(770) 487-2331
Fax: (770) 487-3360
NOTE: T o expedite assistance, all correspondence/communication MUST include the following
information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem
2
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
PAGE
I. SPECIFICATIONS .................................................................................................... 5
1. KM-900MAF (Air-cooled) .................................................................................... 5
2. KM-900MWF (Water-cooled) .............................................................................. 6
3. KM-900MRF (Remote air-cooled) ....................................................................... 7
4. KM-900MRE3 (Remote air-cooled 3 phase) ....................................................... 8
5. CONDENSING UNIT, URC-12F ......................................................................... 9
II. GENERAL INFORMATION .................................................................................... 11
1. CONSTRUCTION ............................................................................................. 11
[a] KM-900MAF (Air-cooled) ............................................................................ 1 1
[b] KM-900MWF (Water-cooled) ...................................................................... 12
[c] KM-900MRF (Remote air-cooled) ............................................................... 13
[d] KM-900MRF3 (Remote air-cooled 3 phase) ............................................... 14
2. CONTROLLER BOARD.................................................................................... 15
[a] SOLID-STATE CONTROL .......................................................................... 15
[b] CONTROLLER BOARD.............................................................................. 15
[c] SEQUENCE ................................................................................................ 19
[d] CONTROLS AND ADJUSTMENTS ............................................................ 22
[e] CHECKING CONTROLLER BOARD.......................................................... 25
III. TECHNICAL INFORMATION............................................................................... 27
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT........................................... 27
[a] KM-900MAF (Air-cooled) ............................................................................ 2 7
[b] KM-900MWF (Water-cooled) ...................................................................... 28
[c] KM-900MRF (Remote air-cooled) ...................................................................
and KM-900MRF3 (Remote air-cooled 3 phase) ........................................ 29
2. WIRING DIAGRAMS......................................................................................... 30
[a] KM-900MAF (Air-cooled) ............................................................................ 3 0
[b] KM-900MWF (Water-cooled) ...................................................................... 31
[c] KM-900MRF (Remote air-cooled) ............................................................... 32
[d] KM-900MRF3 (Remote air-cooled 3 phase) ............................................... 33
3. TIMING CHART ................................................................................................ 34
4. PERFORMANCE DATA.................................................................................... 36
[a] KM-900MAF (Air-cooled) ............................................................................ 3 6
[b] KM-900MWF (Water-cooled) ...................................................................... 37
[c] KM-900MRF (Remote air-cooled) ............................................................... 38
[d] KM-900MRF3 (Remote air-cooled 3 phase) ............................................... 39
3
IV. SERVICE DIAGNOSIS ...........................................................................................40
1. NO ICE PRODUCTION........................................................................................40
2. EVAPORATOR IS FROZEN UP.......................................................................... 43
3. LOW ICE PRODUCTION.....................................................................................43
4. ABNORMAL ICE..................................................................................................4 4
5. OTHERS ..............................................................................................................44
V. REMOVAL AND REPLACEMENT OF COMPONENTS ..........................................45
1. SERVICE FOR REFRIGERANT LINES...............................................................45
[a] REFRIGERANT RECOVERY ........................................................................ 45
[b] EVACUATION AND RECHARGE [R-404A]...................................................45
2. BRAZING .............................................................................................................46
3. REMOVAL AND REPLACEMENT OF COMPRESSOR ......................................47
4. REMOVAL AND REPLACEMENT OF DRIER.....................................................49
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE ..............................49
6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE AND...............................
LINE VALVE .......................................................................................................50
7. REMOVAL AND REPLACEMENT OF EVAPORATOR .......................................52
8. REMOVAL AND REPLACEMENT OF WATER-REGULATING VALVE..................
- WATER COOLED MODEL ONLY .................................................................... 53
9. ADJUSTMENT OF WATER-REGULATING VALVE................................................
- WATER COOLED MODEL ONLY .................................................................... 54
10. REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE .......................
REGULATOR (C.P.R.) - REMOTE AIR-COOLED MODEL ONLY .................. 55
11. REMOVAL AND REPLACEMENT OF THERMISTOR.........................................5 6
12. REMOVAL AND REPLACEMENT OF FAN MOTOR ...........................................57
13. REMOVAL AND REPLACEMENT OF WATER VALVE.......................................58
14. REMOVAL AND REPLACEMENT OF PUMP MOTOR........................................5 8
15. REMOVAL AND REPLACEMENT OF SPRAY TUBES .......................................59
VI. MAINTENANCE AND CLEANING INSTRUCTIONS..............................................60
1. PREPARING THE ICEMAKER FOR LONG STORAGE......................................60
2. CLEANING...........................................................................................................62
[a] CLEANING PROCEDURE.............................................................................63
[b] SANITIZING PROCEDURE ...........................................................................64
3. MAINTENANCE...................................................................................................65
4
I. SPECIFICATIONS
1. KM-900MAF
* We reserve the right to make changes in specifications and design without prior notice.
5
2. KM-900MWF
* We reserve the right to make changes in specifications and design without prior notice.
6
3. KM-900MRF
* We reserve the right to make changes in specifications and design without prior notice.
7
4. KM-900MRF3
* We reserve the right to make changes in specifications and design without prior notice.
8
5. CONDENSING UNIT
URC-12F
9
MODEL: URC-12F
SPECIFICATIONS
EXTERIOR
DIMENSIONS (W x D x H)
REFRIGERANT CHARGE
URC-12F
WEIGHT
CONNECTIONS
REFRIGERANT
ELECTRICAL
CONDENSER
HEAD PRESSURE CONTROL
AMBIENT CONDITION
Galvanized Steel
35 - 11/16” x 15-11/16” x 21-15/16”
(907.2 x 398 x 557.8 mm)
R404A 4 lbs. 7 oz. (2000 g)
Net 80 lbs. (36 kg)
Shipping 87 lbs. (39 kg)
One Shot Couplings (Aeroquip)
Permanent Connection
Air-cooled
Condensing Pressure Regulator
Min. -20°F - Max. +122°F
(-29°C to +50°C)
Outdoor use
10
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-900MAF
11
[b] KM-900MWF
12
[c] KM-900MRF
13
[d] KM-900MRF3
14
2. CONTROLLER BOARD
[a] SOLID-STATE CONTROL
1) A HOSHIZAKI exclusive solid-state control is employed in KM-900MAF,
KM-900MWF, KM-900MRF and KM-900MRF3 Modular Crescent Cubers.
2) A Printed Circuit Board (hereafter called “Controller Board”) includes a stable and
high quality control system.
3) All models are pretested and factory-adjusted.
[b] CONTROLLER BOARD
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the
metal part of the unit 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. Do not misconnect K3, K4 and
K5, because the same connector is used for the Thermistor and Float
Switch. K4 is not connected.
5. Always replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.
PART NUMBER TYPE
2A1410-01 HOS-001A (Control Products)
Features of Control Products “E” Controller Board
1) Maximum Water Supply Period - 6 minutes
Water Solenoid Valve opening, in the Defrost (Harvest) Cycle, is limited by the de-
frost timer. The Water Valve cannot remain open longer than the
maximum period. The Water Valve can close in less than six minutes if the defrost
cycle is completed.
15
2) Defrost Timer
The defrost cycle starts when the Float Switch opens and completes the freeze cycle.
But the Defrost Timer does not start counting until the Thermistor senses 48°F at the
Evaporator outlet. The period from the end of the freeze cycle up to the point of the
Thermistor's sensing varies depending on the ambient and water temperatures.
3) High Temperature Safety - 127 ± 7°F
The temperature of the suction line in the refrigerant circuit is limited by the High Tem-
perature Safety.
During the defrost cycle the Evaporator temperature rises. The Thermistor senses 48°F
and starts the Defrost Timer. After the Defrost Timer counts down to zero, the normal
freeze cycle begins. If the Evaporator temperature continues to rise, the Thermistor will
sense the rise in temperature and at 127 ± 7°F the Thermistor operates the High Temperature Safety.
This High Temperature Safety shuts down the circuit and the icemaker automatically
stops. To reset the safety, turn the power off and back on again.
This High Temperature Safety protects the unit from excessive temperature. The Control
Board will Beep every 3 seconds. The white Reset Button on the Control Board must be
pressed with power on to reset the Safety.
4) Low Water Safety
If the Pump Motor is operated without water, the mechanical seal can fail. To prevent this
type of failure, the Controller Board checks the position of the Float Switch at the end of
the initial one minute water fill cycle and at the end of each defrost cycle.
If the Float Switch is in the up position (electrical circuit closed), the Controller Board
changes to the ice making cycle. If the Float Switch is in the down position (electrical
circuit open), the Controller Board changes to a one minute water fill cycle before starting
the ice making cycle. This method allows for a Low Water Safety shut down to protect
the Water Pump from mechanical seal failure.
For water-cooled model, if the water is shut off, the unit is protected by the High Pressure
Switch.
5) High Voltage Cut-out
The maximum allowable supply voltage of this icemaker is limited by the High Voltage
Cut-out.
If miswiring (especially on single phase 3 wire models) causes excessive voltage on the
Controller Board, the High Voltage Cut-out shuts down the circuit in 3 seconds and the
icemaker automatically stops. When the proper supply voltage is resumed, the icemaker
automatically starts running again. The Control Board will signal this problem using 7
Beeps every 3 seconds.
6) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
16
problem occurs. At startup a 5 second delay occurs while the board conducts an internal
timer check. A short beep occurs when the power switch is turned ON or OFF.
The green LED’s 1-4 represent the corresponding relays and energize and sequence 5
seconds from initial startup as follows:
Sequence Step LED’s on Length: Min. Max. Avg.
1 Minute Fill Cycle LED4 60 sec.
Harvest Cycle LED1, 4, & 2 2 min. 20 min. 3-5 min.
Freeze Cycle LED1 5 min. 60 min. 30-35 min.
Reverse Pump Out LED1, 3, & 2 10 sec. 20 sec. Factory set.
{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}
The built in safeties shut down the unit and have alarms as follows:
1 beep every 3 sec. = High Evaporator Temperature >127 ° F.
Check for defrost problem (stuck HGV or relay), hot water entering unit, stuck headmas-
ter, or shorted thermistor.
2 beeps every 3 sec. = Defrost Back Up Timer. Defrost >20 minutes.
Orange LED marked 20 MIN energizes.
Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefficient
compressor.
3 beeps every 3 sec. = Freeze Back Up Timer. Freeze > 60 minutes.
Yellow LED marked 60 MIN energizes.
Check for F/S stuck closed (up), WV leaking by, HGV leaking by, TXV not feeding properly, low charge, or inefficient compressor.
To manually reset the above safeties, depress white alarm reset button with the power
supply ON.
6 beeps every 3 sec. = Low Voltage. Voltage is 92 Vac or less.
7 beeps every 3 sec. = High Voltage. Control voltage > 147Vac ±5%.
The red LED will de-energize if voltage protection operates.
The voltage safety automatically resets when voltage is corrected.
The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, &
4, normal sequence every 5 seconds. S3 should remain in the “OFF” position for normal
operation.
The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied
17
to the K1 connector. If there is a white wire, place the switch in the C position. If this
switch is placed in the wrong position either the compressor contactor will remain energized with the control switch OFF or the unit will not start.
The dip switches should be adjusted per the adjustment chart published in the Tech
Specs book. 7 & 8 must remain in the OFF position.
(Control Products HOS-001A Board)
18
[c] SEQUENCE
1st Cycle
1. Unit energized and Control Switch to “ICE”
position. Water supply cycle starts.
2. After 1 minute,
Defrost cycle starts.
3. Thermistor reads 48° F.
Defrost Timer starts counting.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
Water Valve
opening is limited
to 6 minutes.
&
4. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.
19
2nd Cycle and after with pump drain
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if Float Switch does not open.
1. Float Switch opens and signals to complete
freeze cycle.
Drain timer starts counting.
&
2. Drain timer stops counting.
Pump drain is completed
3. Thermistor reads 48° F.
Defrost Timer starts
counting.
IMPORTANT
Water Valve
opening is limited to 6
minutes.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
4. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.
20
2nd Cycle and after with no pump drain
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if Float Switch does not open.
1. Float Switch opens and signals to complete
freeze cycle.
&
2. Thermistor reads 48° F.
Defrost Timer starts counting.
IMPORTANT
Water Valve
opening is limited to 6
minutes.
4. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
3. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.
21
[d] CONTROLS AND ADJUSTMENTS
The Dip Switch is factory-adjusted to the following positions:
DIP SWITCH NO. 1 2 3 4 5 6 7 8 9 10
KM-900MRF/3 OFF OFF ON OFF ON ON OFF OFF OFF ON
KM-900MAF, OFF OFF ON OFF ON ON OFF OFF OFF ON
KM-900MWF
Switch Nos. 1 and 2:
Used for adjustment of the Defrost Timer.
The Defrost Timer starts counting when the Thermistor reads a certain temperature
at the Evaporator outlet.
Switch Nos. 3 and 4:
Used for adjustment of the Drain Timer.
When a freeze cycle is completed, the Pump Motor stops, and the icemaker
resumes operation in 2 seconds. Then the Pump Motor drains the Water Tank
for the time determined by the Drain Timer. The Drain Timer also determines the
time to restrain completion of a defrost cycle, i.e. the minimum defrost time.
Switch Nos. 5 and 6:
Used for adjustment of the Drain Counter.
The Pump Motor drains the Water Tank at the frequency determined by the Drain
Counter.
Switch Nos. 7 and 8:
Used only for checking the Controller Board. Usually set in OFF position.
Switch Nos. 9 and 10:
Used for adjustment of Freeze Timer.
The Freeze Timer determines maximum
freeze cycle time. Upon termination of
Freeze Timer, machine initiates the
harvest cycle. After 2 consecutive timer
terminations, machine will shut down,
possibly indicating a problem.
22
1) Defrost Control
A thermistor (Semiconductor) is used for a defrost control sensor. The resistance var-
ies depending on the Suction Line temperatures. The Thermistor detects the temperature of the Evaporator outlet to start the Defrost Timer. No adjustment is required. If
necessary, check for resistance between Thermistor leads, and visually check the
Thermistor mounting, located on the Suction Line next to the Evaporator outlet.
Temperature (°F) Resistance (kΩ)
0 14.401
10 10.613
32 6.000
50 3.871
70 2.474
90 1.633
Check a thermistor for resistance by using the following procedures.
(i) Disconnect the connector K3 on the board.
(ii) Remove the Thermistor. See “V. 11. REMOVAL AND REPLACEMENT OF THER-
MISTOR.”
(iii) Immerse the Thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
(iv) Check for a resistance between Thermistor leads.
Normal reading is within 3.5 to 7 kΩ. Replace the Thermistor if it exceeds the normal
reading.
2) Defrost Timer
No adjustment is required under normal use, as the Defrost Timer is adjusted to the
suitable position. However, if necessary when all the ice formed on the Evaporator
does not fall into the bin in the harvest cycle, adjust the Defrost Timer to longer setting
by adjusting the Dip Switch (No. 1 & 2) on the Controller Board.
SETTING TIME
Dip Switch Dip Switch
No. 1 No. 2
OFF OFF 60 seconds
ON OFF 90 seconds
OFF ON 120 seconds
ON ON 180 seconds
23
3) Drain Timer
The Drain Timer is factory-adjusted, and no adjustment is required.
SETTING TIME
Dip Switch Dip Switch
No. 3 No. 4 T1 T2
OFF OFF 10 seconds 150 seconds
ON OFF 10 seconds 180 seconds
OFF ON 10 seconds 120 seconds
ON ON 20 seconds 180 seconds
T1: Time to drain the Water Tank
T2: Time to restrain defrost completion
4) Drain Counter
CAUTION
Do not adjust the Drain Counter, or the Evaporator may freeze up.
The Drain Counter is factory-adjusted to drain the Water Tank every 10 cycles, and no
adjustment is required. However, where water quality is bad and the icemaker needs a
pump drain more often, the Drain Counter can be adjusted as shown in the table below:
SETTING FREQUENCY
Dip Switch Dip Switch
No. 5 No. 6
OFF OFF every cycle
ON OFF every 2 cycles
OFF ON every 5 cycles
ON ON every 10 cycles
24
5) Freeze Timer
CAUTION
Adjust to proper specification, or the unit may not operate correctly.
Two new dip switches numbered 9 and 10 have been added to the improved “E” board
to better prevent possible freeze ups. These settings come factory set to the default
setting of 60 min. (OFF, OFF). Check the adjustment chart published in the Tech Specs
for proper settings. If the old board does not have these two dip switches, (only 8 instead of 10), leave setting as OFF, OFF.
SETTING TIME
Dip Switch Dip Switch
No. 9 No. 10
OFF OFF 60 min.
ON OFF 70 min.
OFF ON 50 min.
ON ON 60 min.
6) Bin Control
CAUTION
When the ambient temperature is below 45°F, the Bin Control Thermostat
operates to stop the icemaker even if the Ice Storage Bin is empty. When
the Thermostat is set in the prohibited range, the icemaker operates
continuously even if the Ice Storage Bin is filled with ice. Setting in the
prohibited range might cause severe damage to the icemaker resulting in
failure.
No adjustment is required under normal use, as the Bin Control is factory-adjusted.
Adjust it, if necessary, so that the icemaker stops automatically within 10 seconds after
ice contacts the Bin Control Thermostat Bulb.
[e] CHECKING THE CONTROLLER BOARD
1) Visually check the sequence with the icemaker operating.
2) Visually check the Controller Board by using the following procedures.
(i) Adjust the Defrost Timer to minimum position.
Disconnect the Thermistor from the Controller Board.
Connect a 1.5 kΩ - 3.5 kΩ resistor to the Connector K3 (pins #1 and #2), and energize
the unit.
25
After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrost
cycle, the unit should start the freeze cycle.
(ii) After the above step (i), disconnect the Float Switch leads from the Controller Board
within the first 5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of the
freeze cycle.
(iii) Reconnect the Float Switch Connector to the Controller Board. After the first 5
minutes of the freeze cycle, disconnect the Float Switch leads from the Controller
Board.
At this point, the unit should start the defrost cycle.
(iv) After Step (iii), de-energize the unit and confirm that the Defrost Timer is in the
minimum position. Disconnect the resistor from the Controller Board, and energize the unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Re-connect a 1.5 kΩ - 3.5 kΩ resistor to the Connector K3 (pins #1 and #2) after
the first 2 minutes of the defrost cycle.
The unit should start the freeze cycle after 1 minute ± 5 seconds from the resistor
connection.
3) Check the Controller Board by using test program of the Controller Board.
The Output Test Switch “S3” provides a relay sequence test. With power OFF, place
S3 on and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4,
1, and 4, normal sequence every 5 seconds. S3 should remain in the “OFF” position
for normal operation.
26
III. TECHNICAL INFORMATION
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT
[a] KM-900MAF
27
[b] KM-900MWF
28
[c] KM-900MRF and KM-900MRF3
29
2. WIRING DIAGRAMS
[a] KM-900MAF
Note: Pressure Switch
Cut-out 412 ± PSIG
Cut-in 327 ± 21 PSIG
21
0
30
[b] KM-900MWF
Note: Pressure Switch
Cut-out 412 ± PSIG
Cut-in 327 ± 21 PSIG
21
0
31
[c] KM-900MRF
Note: Pressure Switch
Cut-out 412 ± PSIG
Cut-in 327 ± 21 PSIG
21
0
32
[d] KM-900MRF3
Note: Pressure Switch
Cut-out 412 ± PSIG
Cut-in 327 ± 21 PSIG
21
0
33
3. TIMING CHART
When Control Sw. is turned OFF, Pressure Sw. is OFF, or Thermistor Temp. exceeds t1.
From Defrost Cycle
To Defrost Cycle
If Float Sw. is OFF
Hi Temp Mid Temp Lo Temp Too Lo Temp Normal Too Hi Temp Lo Water
Time Up (60 sec)
Control
Sw. in
ICE
Bin
Thermostat ON
Pressure
Sw. ON
Overheat
Protect
Reset
Max. Min.
60 min 5 min
(KM-1200SAE50)
(KM-SRE50
1
*
1
*
2
*
3
*
Min. Max. Max.
2 min 6 min 6 min
Max.
20 min
*Note: The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See “II. 2. [d] CONTROLS
AND ADJUSTMENTS.”
34
To Stand-by Cycle (When Control Sw. is turned OFF, Pressure Sw. is OFF, or Thermistor Temp. exceeds t1.)
To Freeze Cycle
From Freeze Cycle
Control
Sw. in
1
*
WASH
(KM-1200SAE50)
(KM-1200SRE50)
2
*
2
*
3
*
4
*
Min. Max. Max.
3 min 6 min 6 min
Max.
20 min
*1 The Pump Motor waits for 2 seconds before starting a drain cycle. See “II. 2. [d] CONTROLS AND
ADJUSTMENTS.”
*2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See “II. 2. [d] CONTROLS AND
ADJUSTMENTS.”
35
4. PERFORMANCE DATA
[a] KM-900MAF
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for
reference only.
* We reserve the right to make changes in specifications and design without prior notice.
36
[b] KM-900MWF
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for
reference only.
* We reserve the right to make changes in specifications and design without prior notice.
37
[c] KM-900MRF
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for
reference only.
* We reserve the right to make changes in specifications and design without prior notice.
38
[b] KM-900MRF3
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for
reference only.
* We reserve the right to make changes in specifications and design without prior notice.
39
IV. SERVICE DIAGNOSIS
1. NO ICE PRODUCTION
PROBLEM POSSIBLE CAUSE REMEDY
[1] The icemaker a) Power Supply 1. “OFF” position. 1. Move to “ON” position
will not start 2. Loose connections. 2. Tighten
3. Bad contacts. 3. Check for continuity and
replace.
4. Voltage too high. 4. Check and get
recommended voltage.
b) Fuse (Inside Fused 1. Blown out. 1. Check for short circuit
Disconnect, if any) and replace
c) Control Switch 1. “OFF” position. 1. Move to “ICE” position.
2. Bad contacts. 2. Check for continuity and
replace.
d) Bin Control 1. Tripped with bin filled 1. Remove ice.
Thermostat with ice.
2. Ambient temperature 2. Increase ambient
too cool. temperature.
3. Set too warm. 3. See “II.2.[d]
CONTROLS AND
ADJUSTMENTS, 5) Bin
Control.”
4. Bulb out of position. 4. Place in position.
5. Bad contacts or leaks 5. Check for continuity and
bulb. replace.
e) High Pressure 1. Bad contacts. 1. Check for continuity and
Control replace.
f) Transformer 1. Thermal fuse blown out 1. Replace.
or coil winding opened.
g) Wiring to 1. Loose connections or 1. Check for continuity and
Controller Board open. replace.
h) Thermistor 1. Leads short-circuit or 1. See “II.2.[d] CONTROLS
open and High AND ADJUSTMENTS, 1)
Temperature Safety Defrost Control.”
operates.
i) Hot Gas Solenoid 1. Continues to open in 1. Check for power off in
Valve freeze cycle and High freeze cycle and replace.
Temperature Safety
operates.
j) Water Supply Line 1. Water supply off and 1. Check and get
water supply cycle does recommended pressure.
not finish.
2. Condenser water pressure 2. Check and get
too low or off and Pressure recommended pressure.
Control opens and closes
frequently to finally operate
High Temperature Safety.
k) Water Solenoid 1. Mesh filter or orifice gets 1. Clean.
clogged and water supply
cycle does not finish.
2. Coil winding opened. 2. Replace.
3. Wiring to Water Valve. 3. Check for loose connection
or open, and replace.
40
PROBLEM POSSIBLE CAUSE REMEDY
l) Controller Board 1. Defective 1. See “II.2[e] CHECKING
CONTROLLER BOARD.”
m) Interlock Switch 1. “OFF” position. 1. Move to “ON” position.
(Cleaning Valve) 2. Bad contacts. 2. Check for continuity and
replace.
[2] Water a) Float switch 1. Connector disconnected. 1. Place in position.
continues to 2. Leads opened or defective 2. Check and replace.
be supplied, switch.
and the ice- 3. Float does not move freely. 3. Clean or replace.
maker will not b) Controller Board 1. Defective. 1. Replace.
start.
[3] Compressor a) Wash Switch 1. “WASH” position. 1. Move to “ICE” position.
will not start 2. Bad contacts. 2. Check and replace.
or operates b) High Pressure 1. Dirty Air Filter or 1. Clean.
intermittently. Control Condenser.
2. Ambient or condenser 2. Reduce ambient temp.
water temp. too warm.
3. Refrigerant overcharged. 3. Recharge.
4. Condenser water pressure 4. Check and get
too low or off. [Water- recommended pressure.
cooled model only].
5. Fan not operating. [Except 5. See chart 1 - [6].
water-cooled model].
6. Refrigerant line or 6. Clean and replace Drier.
components plugged.
c) Water Regulator 1. Set too high. 1. Adjust lower.
d) Overload Protector 1. Bad contacts. 1. Check for continuity and
replace.
2. Voltage too low. 2. Increase voltage.
3. Refrigerant overcharged or 3. Recharge.
undercharged.
4. Line Valve continues to 4. Check Line Valve's
close in freeze cycle and operation in freeze cycle
Overload Protector and replace.
operates.
e) Starter 1. Bad contacts. 1. Check and replace.
2. Coil winding opened. 2. Replace.
f) Start Capacitor or 1. Defective. 1. Replace.
Run Capacitor
g) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and
replace.
2. Coil winding opened. 2. Replace.
h) Compressor 1. Wiring to Compressor. 1. Check for loose
connection or open, and
replace.
2. Defective. 2. Replace.
3. Protector tripped. 3. Reduce temperature.
i) Controller board 1. Defective. 1. See “II.2. [e] CHECKING
CONTROLLER BOARD.”
j) Discharge Temp. 1. Refrigerant 1. Recharge.
Switch undercharged.
2. Cooling Fan not operating. 2. See chart 1 - [6]
41
PROBLEM POSSIBLE CAUSE REMEDY
[4] Water a) Water Solenoid 1. Diaphragm does not close. 1. Check for water leaks
continues to Valve with icemaker off.
be supplied in b) Controller Board 1. Defective. 1. See “II.2.[e] CHECKING
freeze cycle. CONTROLLER BOARD.”
[5] No water a) Water Supply Line 1. Water pressure too low and 1. Check and get
comes from water level in Water Tank recommended pressure.
Spray Tubes. too low.
Water Pump b) Water Solenoid 1. Dirty mesh filter or orifice 1. Clean.
will not start, or Valve and water level in Water
freeze cycle Tank too low.
time is too c) Water System 1. Water leaks. 1. Check connections for
short. water leaks, and replace.
2. Clogged. 2. Clean.
d) Pump Motor 1. Motor winding opened. 1. Replace.
2. Bearing worn out. 2. Replace.
3. Wiring to Pump Motor. 3. Check for loose
connection or open, and
replace.
4. Defective Capacitor. 4. Replace.
5. Defective or bound impeller. 5. Replace and clean.
6. Mechanical Seal worn out. 6. Check and replace.
e) Controller Board 1. Defective. 1. See “II.2. [e] CHECKING
CONTROLLER BOARD.”
[6] Fan Motor will a) Fan Motor 1. Motor winding opened. 1. Replace.
not start, or is 2. Bearing worn out. 2. Replace.
not operating. 3. Wiring to Fan Motor. 3. Check for loose
connection or open, and
replace.
4. Defective Capacitor. 4. Replace
5. Fan blade bound. 5. Check and replace.
b) Controller Board 1. Defective. 1. See “II.2. [e] CHECKING
CONTROLLER BOARD.”
[7] All components a) Refrigerant 1. Undercharged. 1. Check for leaks and
run but no ice recharge.
is produced. 2. Air or moisture trapped. 2. Replace Drier, and
recharge.
b) Compressor 1. Defective valve. 1. Replace.
c) Hot Gas Solenoid 1. Continues to open in freeze 1. Check and replace.
Valve cycle.
d) Line Valve 1. Continues to close in 1. Check and replace
freeze cycle.
e) Water Supply Line 1. Condenser water pressure 1. Check and get
[Water-cooled model too low or off and Pressure recommended pressure.
only] Control opens and closes
frequently.
42
2. EVAPORA TOR IS FROZEN UP
PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle a) Float Switch 1. Leads short-circuit or 1. Check and replace.
time is too defective switch.
long. 2. Float does not move freely. 2. Clean or replace.
b) Water Solenoid 1. Diaphragm does not close. 1. Check for water leaks
Valve with icemaker off.
c) Controller Board 1. Defective. 1. See “II.2[e] CHECKING
CONTROLLER BOARD.”
[2] All ice formed a) Evaporator 1. Scaled up. 1. Clean.
on Evaporator b) Water Supply Line 1. Water pressure too low. 1. Check and get
does not fall recommended pressure.
into bin in c) Water Solenoid 1. Dirty mesh filter or orifice. 1. Clean.
harvest cycle. Valve 2. Diaphragm does not close. 2. Check for water leaks
with icemaker off.
d) Ambient and/or 1. Too cool. 1. Increase temperature.
water temperature
e) Line Valve 1. Continues to open in 1. Check operation in
harvest cycle. harvest cycle and replace.
f) Thermistor 1. Out of position or loose 1. See “V. 11. REMOVAL
attachment. AND REPLACEMENT OF
THERMISTOR.”
g) Controller Board 1. Defrost Timer is set too 1. Adjust longer, referring
short. to “II. 2. [d] CONTROLS
AND ADJUSTMENT, 2)
Defrost Timer.”
2. Defective. 2. See “II. 2.[e] CHECKING
CONTROLLER BOARD.”
[3] Others a) Spray Tubes 1. Clogged. 1. Clean.
2. Out of position. 2. Place in position.
b) Water System 1. Dirty. 1. Clean.
c) Refrigerant 1. Undercharged. 1. Check for leaks and
recharge.
d) Expansion Valve 1. Bulb out of position or 1. Place in position.
loose attachment.
2. Defective. 2. Replace.
e) Hot Gas Solenoid 1. Coil winding opened. 1. Replace.
Valve 2. Plunger does not move. 2. Replace.
3. Wiring to Hot Gas Valve. 3. Check for loose
connection or open, and
replace.
3. LOW ICE PRODUCTION
PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle a) See chart 1 - [3], and check dirty Air Filter or Condenser, ambient or water
time is long. temperature, water pressure, Water Regulator or refrigerant charge.
b) See chart 2 - [1], and check Float Switch, Water Solenoid Valve or Controller
Board.
[2] Harvest cycle a) See chart 2 - [2], and check Controller Board, Thermistor, Evaporator, ambient
time is long and/or water temperature, water supply line, Water Solenoid Valve, Line Valve.
43
4. ABNORMAL ICE
PROBLEM POSSIBLE CAUSE REMEDY
[1] Small Cube a) Ice Cube Guide 1. Out of position. 1. Place in position.
Circulated water falls into
bin.
b) See chart 1 - [5], and check water supply line, Water Solenoid Valve, water system,
Pump Motor or Controller Board.
c) Drain Valve 1. Dirty. 1. Clean.
[2] Cloudy or a) See chart 2 - [1] and - [3], and check Float Switch, Water Solenoid Valve,
irregular cube Controller Board, Spray Tubes, water system, refrigerant charge or Expansion
Valve.
b) Spray Guide 1. Dirty. 1. Clean.
c) Water Quality 1. High hardness or contains 1. Install a water filter or
impurities. softener.
5. OTHERS
PROBLEM POSSIBLE CAUSE REMEDY
[1] Icemaker will a) Bin Control 1. Set too cold. 1. Adjust warmer.
not stop when Thermostat 2. Defective. 2. Replace.
bin is filled
with ice.
[2] Abnormal a) Pump Motor 1. Bearings worn out. 1. Replace.
noise b) Fan Motor 1. Bearings worn out. 1. Replace.
2. Fan blade deformed. 2. Replace fan blade.
3. Fan blade does not move 3. Replace.
freely.
c) Compressor 1. Bearings worn out, or 1. Replace.
cylinder valve broken.
2. Mounting pad out of 2. Reinstall
position.
d) Refrigerant Lines 1. Rub or touch lines or other 1. Replace.
surfaces.
[3] Ice in storage a) Bin Drain 1. Plugged. 1. Clean.
bin often
melts.
44
V. REMOVAL AND REPLACEMENT OF COMPONENTS
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after the
equipment is serviced.
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 5 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 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.
45
5) Disconnect the Vacuum Pump, and attach a Refrigerant Service Cylinder to the Highside 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.
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
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.
through
2. BRAZING
DANGER
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. Refriger
ant 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 inside the Evaporator Case are clear-paint coated. Sandpaper
the brazing connections before unbrazing the components. Use a good abrasive cloth
to remove coating.
46
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.
Note: When replacing a Compressor with a defective winding, be sure to install the new Start
Capacitor and Start Relay supplied with the replacement Compressor. Due to the
ability of the POE oil in the compressor to absorb moisture quickly, the Compressor
must not be opened more than 15 minutes for replacement or service. Do not mix
lubricants of different compressors even if both are charged with R-404A, except when
they use the same lubricant.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the Terminal Cover on the Compressor, and disconnect the Compressor Wiring.
5) Remove the Discharge and Suction Pipes using brazing equipment.
6) Remove the Hold-down Bolts, Washers and Rubber Grommets.
7) Slide and remove the Compressor. Unpack the new Compressor package. Install the
new Compressor.
8) Attach the Rubber Grommets of the prior Compressor.
9) Sandpaper the Suction, Discharge and Process Pipes.
10) Place the Compressor in position, and secure it using the Bolts and Washers.
11) Remove plugs from the Suction, Discharge and Process Pipes.
12) Braze the Process, Suction and Discharge lines (Do not change this order), while purging
with nitrogen gas flowing at the pressure 3-4 PSIG.
13) Install the new Filter Drier.
14) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
47
15) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled
models, see the Nameplate for the required refrigerant charge. For remote air-cooled
models, see the Charge Label in the machine compartment.
16) Connect the Terminals, and replace the Terminal Cover in its correct position.
17) Replace the panels in their correct positions.
18) Turn on the power supply.
48
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) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the Drier.
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. For air-cooled and water cooled models, see the Nameplate for the required refrigerant charge. For remote
air-cooled models, see the Charge Label in the machine compartment.
8) Replace the panels in their correct positions.
9) Turn on the power supply.
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 repair or replacement has been made.
1) Turn off the power supply.
2) Remove the panels.
49
3) Recover the refrigerant and store it in an approved container.
4) Remove the insulation and the Expansion Valve Bulb on the suction line.
5) Remove the Expansion Valve Cover, and disconnect 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, and charge it with refrigerant. For air-cooled and water cooled models, see the Nameplate for the required refrigerant charge. For remote
air-cooled models, see the Charge Label in the machine compartment.
10) Attach the Bulb to the suction line in position. Be sure to secure it with clamps and
to insulate it.
11) Place the new set of Expansion Valve Covers in position.
12) Replace the panels in their correct positions.
13) Turn on the power supply.
6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE AND LINE
VALVE
CAUTION
Always use a copper tube of the same diameter and length when replacing
the hot gas lines; otherwise the performance may be reduced.
50
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) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the screw and the Solenoid.
5) Disconnect the Hot Gas Valve or Line Valve using brazing equipment.
6) Install the new valve.
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, and charge it with refrigerant. For air-cooled and water cooled models, see the Nameplate for the required refrigerant charge. For remote
air-cooled models, see the Charge Label in the machine compartment.
10) Cut the leads of the Solenoid allowing enough lead length to reconnect using
closed end connectors.
11) Connect the new Solenoid leads.
12) Attach the Solenoid to the valve body, and secure it with a screw.
13) Replace the panels in their correct positions.
14) Turn on the power supply.
51
7. REMOVAL AND REPLACEMENT OF EVAPORATOR
IMPORTANT
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) Turn off the power supply.
2) Remove the panels and the Top Insulation over the Evaporator.
3) Recover the refrigerant and store it in an approved container.
4) Remove the Spray Tubes and the Insulations at the “U” shaped notch where the
refrigeration tubings go through the molded chassis.
5) Remove the Insulation Tube, and disconnect the Evaporator Inlet Tubing at the Tee
next to the Expansion Valve.
6) Lift up the Evaporator, and disconnect the Evaporator Outlet Tubing.
7) Install the new Evaporator.
8) Install the new Drier.
9) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
10) Evacuate the system, and charge it with refrigerant. For air-cooled and water cooled models, see the Nameplate for the required refrigerant charge. For remote
air-cooled models, see the Charge Label in the machine compartment.
11) Replace the removed parts in the reverse order of which they were removed.
12) Replace the Top Insulation and the panels in their correct positions.
13) Turn on the power supply.
52
8. REMOVAL AND REPLACEMENT OF WATER REGULATING VALVE WATER-COOLED MODEL ONLY
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) Turn off the power supply.
2) Close the Water Supply Line Shut-off Valve.
3) Remove the panels.
4) Recover the refrigerant and store it in an approved container.
5) Disconnect the Capillary Tube at the Condenser outlet using brazing equipment.
6) Disconnect the Flare-connections of the valve.
7) Remove the screws and the valve from the Bracket.
8) Install the new valve, and braze the Capillary Tube.
9) Install the new Drier.
10) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
11) Evacuate the system, and charge it with refrigerant. See the Nameplate for the
required refrigerant charge.
12) Connect the Flare-connections.
13) Open the Water Supply Line Shut-off Valve.
14) Check for water leaks.
15) Replace the panels in their correct positions.
16) Turn on the power supply.
53
9. ADJUSTMENT OF WATER REGULA TING VALVE - W ATER-COOLED
MODEL ONLY
The Water Regulating Valve (also called “WATER REGULATOR”) is factory-adjusted.
No adjustment is required under normal use. Adjust the Water Regulator, if necessary,
using the following procedures.
1) Attach a pressure gauge to the high-side line of the system. Or prepare a
thermometer to check for the condenser drain temperature.
2) Rotate the adjustment screw by using a flat blade screwdriver, so that the pressure
gauge shows 270 PSIG or the thermometer reads 104-115 °F, 5 minutes after a freeze
cycle or icemaking process starts. When the pressure exceeds 270 PSIG, or the
condenser drain temperature exceeds 115 ° F, rotate the adjustment screw counterclockwise. See Fig. 1.
3) Check that the pressure or the condenser drain temperature holds a stable setting.
Fig. 1
54
10. REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE
REGULATOR (C.P.R.) - REMOTE AIR-COOLED MODEL ONLY
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) Turn off the power supply.
2) Remove the panels from the remote condenser unit.
3) Recover the refrigerant and store it in an approved container.
4) Before heating, break off the stub on the dome to release the dome charge.
5) Disconnect the C.P.R. using brazing equipment.
6) Install the new C.P.R. Use nitrogen gas at the pressure of 3-4 PSIG when brazing the
C.P.R.
WARNING
Always protect the C.P.R. body by using a damp cloth to prevent the C.P.R.
from overheating. Do not braze with the C.P.R. body exceeding 250°F.
7) Install the new Drier in the icemaker.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system and charge it with refrigerant. See the Charge Label in the
machine compartment in the icemaker.
10) Replace the panels in their correct positions.
11) Turn on the power supply.
55
11. REMOVAL AND REPLACEMENT OF THERMISTOR
CAUTION
1. Fragile, handle very carefully.
2. Always use a recommended sealant (High Thermal Conductive Type),
Model KE4560RTV manufactured by SHINETSU SILICONE, Part Code
60Y000-11, or Part Code 4A0683-01 equivalent.
3. Always use a recommended foam insulation (Non-absorbent Type) or
equivalent.
4. Do not shorten or cut the thermistor leads when installing it.
1) Turn off the power supply.
Thermistor Lead Cable Tie
2) Remove the panels.
3) Remove the Control Box Cover.
4) Disconnect the Thermistor leads from
the K3 Connector on the Controller Board.
5) Remove the Plastic Cable Ties, Foam
Insulation, Thermistor Holder and
Thermistor. See Fig. 2.
Foam Insulation Thermistor Holder
Fig. 2
6) Scrape away the old sealant on the
Thermistor Holder and the Suction Pipe.
7) Wipe off moisture or condensation on the Suction Pipe.
8) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or
4A0683-01) to the Thermistor Holder concave.
9) Attach the new Thermistor to the Suction Pipe very carefully to prevent damage to
the leads. And secure it using the Thermistor Holder and recommended foam
insulation.
Note: For models with the Liquid Bypass, the Thermistor should be
located upstream from the Liquid Bypass outlet, and its end should
be 4-3/4" or more away from the outlet. See Fig. 3.
56
Min. 4-3/4"
Liquid Bypass
Flow
Fig. 3
10) Secure the insulation using the Plastic Cable Ties.
11) Connect the Thermistor leads through the bushing of the Control Box to the K3
Connector on the Controller Board.
Note: Do not cut the leads of the Thermistor while installing it.
12) Replace the Control Box Cover and the panels in their correct positions.
13) Turn on the power supply.
12. REMOVAL AND REPLACEMENT OF FAN MOTOR
Note: When replacing a Fan Motor with defective winding, it is recommended
that a new capacitor be installed.
1) Turn off the power supply.
2) Remove the panels.
3) Remove the Junction Box Cover from the remote condenser unit (Remote Air-cooled
model).
4) Remove the closed end connectors from the Fan Motor leads.
5) Remove the Fan Motor Bracket and Fan Motor.
6) Install the new Fan Motor, and replace the removed parts in the reverse order of
which they were removed.
7) Replace the panels in their correct positions.
8) Replace the Junction Box Cover in its correct position (Remote Air-cooled model).
9) Turn on the power supply.
57
13. REMOVAL AND REPLACEMENT OF WATER VALVE
1) Turn off the power supply.
2) Close the Water Supply Line Shut-off Valve.
3) Remove the Front Panel.
4) Remove the Valve Outlet Tubing by releasing the Clamp.
5) Remove the Bracket from the unit.
6) Remove the Fitting Nut and Water Valve.
7) Disconnect the Terminals from the Water Valve.
8) Install the new Water Valve, and replace the removed parts in the reverse order of
which they were removed.
9) Open the Water Supply Line Shut-off Valve.
10) Turn on the power supply.
11) Check for leaks.
12) Replace the Front Panel in its correct position.
14. REMOVAL AND REPLACEMENT OF PUMP MOTOR
1) Turn off the power supply.
2) Remove the Front Panel.
3) Remove the Base Cover.
4) Drain the Water Tank by removing one end of the Pump Tubing.
5) Replace the removed parts in their correct positions.
6) Disconnect the Pump Suction and Discharge Hoses.
7) Remove the screws and the Pump Motor Bracket.
58
8) Remove the closed end connectors from the Pump Motor leads.
9) Remove the two screws and the Pump Motor Bracket.
10) Remove the Pump Housing, and check the Impeller.
11) If the Impeller is defective, install a new Impeller.
12) Install the new motor or new parts, and replace the removed parts in the reverse
order of which they were removed.
13) Turn on the power supply, and check for leaks.
14) Replace the Base Cover.
15) Replace the Front Panel in its correct position.
15. REMOVAL AND REPLACEMENT OF SPRAY TUBES
1) Turn off the power supply.
2) Remove the Front Panel and the Insulation Panel.
3) Remove the Rubber Hoses from the Spray Tubes (Water Supply Pipe).
4) Release the Clamps, and disconnect the Rubber Hoses.
5) Remove the Spray Tubes by squeezing the side tabs.
6) Install the new Spray Tubes, and replace the removed parts in the reverse order of
which they were removed.
7) Replace the panels in their correct positions.
8) Turn on the power supply.
59
VI. MAINTENANCE AND CLEANING INSTRUCTIONS
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 tank 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.
• When the icemaker is not used for two or three days, it is sufficient to only move the
Control Switch to the “OFF” position, unless the icemaker will be at sub-freezing
temperatures.
[1] On water-cooled model only, first remove the water from the water-cooled condenser:
1) Remove the Front Panel.
2) Move the Control Switch, on the Control Box, to the “OFF” position.
3) Wait 3 minutes.
4) Move the Control Switch to the “ICE” position.
5) Allow 5 minutes for the icemaker to fill with water and the Water Pump to start operating.
6) Close the Water-cooled Condenser Water Supply Line Shut-off Valve.
7) Open the Drain Valve for the water-cooled condenser water supply line.
8) Allow the line to drain by gravity.
9) Attach compressed air or carbon dioxide supply to the Condenser Water Line Drain
Valve.
10) Quickly blow the water-cooled condenser out using compressed air or carbon
dioxide until water stops coming out.
60
[2] Remove the water from the potable water supply line:
1) Remove the Front Panel. (Except water-cooled model)
2) Move the Control Switch, on the Control Box, to the “OFF” position.
3) Wait 3 minutes.
4) Close the Potable Water Supply Line Shut-off Valve and open the Potable Water
Supply Line Drain Valve.
5) Allow the line to drain by gravity.
6) Attach compressed air or carbon dioxide supply to the Potable Water Line Drain Valve.
7) Move the Control Switch to the “ICE” position.
8) Blow the potable water line out using compressed air or carbon dioxide.
[3] Drain the Potable Water Tank:
1) Turn off the power supply.
2) Move the Control Switch to the “OFF”
position.
3) Drain the Water Tank by removing the
base cover and one end of the Pump
Tubing. See Fig. 4.
4) Replace the removed parts in their
correct positions.
5) Remove all ice from the Storage Bin,
and clean the Storage Bin.
6) Replace the Front Panel in its correct
position.
7) Close the Drain Valve.
Fig. 4
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2. CLEANING
Ensure all components, fasteners and thumbscrews are securely in place
after any maintenance or cleaning is done to the equipment.
1. HOSHIZAKI recommends cleaning this unit at least once 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 for safe handling of the cleaning and
sanitizing solution. This will prevent irritation in case the solution comes
into contact with skin.
IMPORTANT
WARNING
IMPORTANT
1. The Cleaning Valve is used to allow solution flow to the inside of the
Evaporator during the cleaning and sanitizing operation. It should be
closed for all icemaking operation. The Compressor will not operate
unless this valve is completely closed.
2. To open the Cleaning Valve, the Valve Handle should be parallel to the
valve body. To close the valve, the Valve Handle should be at a right
angle to the valve body.
CLOSED POSITION OPEN POSITION
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[a] CLEANING PROCEDURE
1) Dilute 16 fl. oz. of the recommended cleaner Hoshizaki “Scale Away” or
“LIME-A-WAY” (Economics Laboratory, Inc.) with 3 gallons of water.
2) Remove all ice from the Evaporator and the Storage Bin.
Note: To remove cubes on the Evaporator, turn off the power supply and turn
it on after 3 minutes. The defrost cycle starts and the cubes will be
removed from the Evaporator.
3) Turn off the power supply.
4) Remove the Front Panel and then remove the Insulation Panel.
5) Remove the Base Cover.
6) Drain the Water Tank by removing one end of the Pump Tubing. See Fig. 4.
7) After tank has drained, replace the removed parts in their correct positions.
8) Pour the cleaning solution into the Water Tank.
9) Fully open the Cleaning Valve on the left side wall of the machine compartment.
10) Move the Control Switch, on the Control Box, to the “WASH” position.
11) Replace the Insulation Panel and the Front Panel in their correct positions.
12) Turn on the power supply, and start the washing process.
13) Turn off the power supply after 30 minutes.
14) Remove the Front Panel and the Insulation Panel.
15) Drain the Water Tank. (See the above step 6).
16) Replace the tubing and the Insulation Panel in their correct positions.
17) Move the Control Switch to the “ICE” position.
18) Close the Cleaning Valve.
Note: The icemaker will not operate unless the Cleaning Valve is
completely closed.
19) Replace the Front Panel in its correct position.
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20) Turn on the power supply to fill the Water Tank with water.
21) Turn off the power supply after 3 minutes.
22) Remove the Front Panel, and fully open the Cleaning Valve.
23) Move the Control Switchto the “Wash” position.
24) Replace the Front Panel in its correct position.
25) Turn on the power supply to rise off the cleaning solution.
26) Turn off the power supply after 5 minutes.
27) Remove the Front Panel and Insulation Panel.
28) Drain the Water Tank by removing one end of the pump tuging. See Fig. 4.
After the tank has drained, replace the removed parts in their correct positions.
Note: Do not replace the Insulation Panel when you proceed to
“[b] SANITIZING PROCEDURE.’
29) Repeat the above steps 17) through 28) three more times to rinse thoroughly.
Note: If you do not sanitize the icemaker, go to step 9) in “[b] SANITIZING
PROCEDURE.”
[b] SANITIZING PROCEDURE - Following Cleaning Procedure
1) Dilute a 5.25% Sodium Hypochlorite solution (chlorine bleach) with water
(Add 1.5 fl. oz. of sanitizer to 3 gal. of water).
2) Remove the Insulation Panel, if it is in its normal position.
3) Pour the sanitizing solution into the Water Tank.
4) Replace the Insulation Panel and the Front Panel in their correct positions.
Note: Make sure that the Control Switch is in the “WASH” position and the
Cleaning Valve is open.
5) Turn on the power supply, and start the sanitizing process.
6) Turn off the power supply after 15 minutes.
7) Remove the Front Panel and if necessary, the Insulation Panel.
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8) Drain the Water Tank. See the above step 5) in “[a] CLEANING PROCEDURE.”
9) Replace the removed parts and the Insulation Panel in their correct positions.
10) Repeat the above steps 15) through 28) in “[a] CLEANING PROCEDURE” two
times to rinse thoroughly.
11) Close the Cleaning Valve.
12) Move the Control Switch to the “ICE” position.
13) Replace the Front Panel in its correct position.
14) Clean the Storage Bin with water.
15) Turn on the power supply, and start the automatic icemaking process.
3. MAINTENANCE
This icemaker must be maintained individually, referring to the instruction
manual and labels provided with the icemaker.
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.
• The Storage Bin is for ice use only. Do not store anything else in the bin.
• Keep the scoop clean. Clean it by using a neutral cleaner and rinse thoroughly.
• Clean the bin liner by using a neutral cleaner. Rinse thoroughly after cleaning.
IMPORTANT
3) Condenser (Except water-cooled model)
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.
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