Hoshizaki Server KM 2400SRF3 User Manual

Reliability is a  
beautiful thing  
TM  
STACKABLE CRESCENT CUBER  
KM-2400SRF3  
KM-2400SRH3  
SERVICE MANUAL  
NUMBER:  
ISSUED:  
73090  
DEC. 23, 1999  
REVISED: DEC, 14, 2003  
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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-2400SRF3, KM-2400SRH3 (Remote air-cooled, 3 phase) ........................... 5  
2. CONDENSING UNIT, URC-24F ......................................................................... 6  
II. GENERAL INFORMATION ...................................................................................... 8  
1. CONSTRUCTION ............................................................................................... 8  
2. CONTROLLER BOARD...................................................................................... 9  
[a] SOLID-STATE CONTROL ............................................................................ 9  
[b] CONTROLLER BOARD................................................................................ 9  
[c] SEQUENCE ................................................................................................ 14  
[d] CONTROLS AND ADJUSTMENTS ........................................................... 17  
[e] CHECKING THE CONTROLLER BOARD ................................................. 20  
III. TECHNICAL INFORMATION ............................................................................... 22  
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT .......................................... 22  
2. WIRING DIAGRAM ........................................................................................... 23  
3. TIMING CHART ................................................................................................ 24  
4. PERFORMANCE DATA ................................................................................... 26  
IV. SERVICE DIAGNOSIS ........................................................................................ 27  
1. NO ICE PRODUCTION..................................................................................... 27  
2. EVAPORATOR IS FROZEN UP....................................................................... 30  
3. LOW ICE PRODUCTION .................................................................................. 31  
4. ABNORMAL ICE ............................................................................................... 31  
5. OTHERS ........................................................................................................... 31  
V. REMOVAL AND REPLACEMENT OF COMPONENTS....................................... 32  
1. SERVICE FOR REFRIGERANT LINES ........................................................... 32  
[a] REFRIGERANT RECOVERY..................................................................... 32  
[b] EVACUATION AND RECHARGE .............................................................. 32  
2. BRAZING.......................................................................................................... 33  
3. REMOVAL AND REPLACEMENT OF COMPRESSOR .................................. 34  
4. REMOVAL AND REPLACEMENT OF DRIER ................................................. 35  
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE .......................... 36  
6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE ...................................  
AND LINE VALVE............................................................................................. 37  
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7. REMOVAL AND REPLACEMENT OF EVAPORATOR....................................... 38  
8. REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE
REGULATOR (C.P.R.)......................................................................................... 39  
9. REMOVAL AND REPLACEMENT OF THERMISTOR ........................................ 40  
10. REMOVAL AND REPLACEMENT OF FAN MOTOR .......................................... 41  
11. REMOVAL AND REPLACEMENT OF WATER VALVE ...................................... 42  
12. REMOVAL AND REPLACEMENT OF PUMP MOTOR ....................................... 42  
13. REMOVAL AND REPLACEMENT OF SPRAY TUBES ...................................... 43  
VI. CLEANING AND MAINTENANCE INSTRUCTIONS ............................................. 44  
1. PREPARING THE ICEMAKER FOR LONG STORAGE...................................... 44  
2. CLEANING PROCEDURE .................................................................................. 46  
[a] CLEANING PROCEDURE ............................................................................ 47  
[b] SANITIZING PROCEDURE ........................................................................... 49  
3. MAINTENANCE................................................................................................... 50  
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I. SPECIFICATIONS  
KM-2400SRF3, KM-2400SRH3 (Remote air-cooled, 3 phase)  
We reserve the right to make changes in specifications and design without prior notice.  
5
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2. CONDENSING UNIT, URC-24F  
6
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SPECIFICATIONS  
MODEL: URC-24F  
EXTERIOR  
GalvanizedSteel  
36” x 19-3/4” x 43-3/4”  
DIMENSIONS (W x D x H)  
(915 x 501 x 1111 mmmm)  
REFRIGERANTCHARGE  
URC-24F  
R404A 11 lbs. (5000 g)  
Net 168 lbs. (76 kg)  
Shipping 179 lbs. (81 kg)  
WEIGHT  
CONNECTIONS  
REFRIGERANT  
ELECTRICAL  
One Shot Couplings (Aeroquip)  
Permanent Connection  
Air-cooled  
CONDENSER  
208-230/60/1  
AC SUPPLY VOLTAGE  
AMBIENTCONDITION  
Min. -20°F - Max. +122°F  
(-29°C to +50°C)  
Outdoor use  
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II. GENERAL INFORMATION  
1. CONSTRUCTION  
Evaporator  
Spray Tube  
Water Supply Inlet  
Transformer Box  
Header  
Junction Box  
CPR Valve  
Receiver Tank  
Drier  
Line Valve  
Wat
Floa
Pressure Switch  
Clea
Expa
Compressor  
Control Box  
Hot Gas Valve  
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2. CONTROLLER BOARD  
[a] SOLID-STATE CONTROL  
1) A HOSHIZAKI exclusive solid-state control is employed in KM-2400SRF3 and  
KM-2400SRH3 Stackable 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  
KM-2400SRF3 uses  
KM-2400SRH3 uses  
2A0836-01  
or 2A1410-01  
HOSHIZAKI (Control Products - 8 Pin)  
HOS-001A (Control Products - 10 Pin)  
2A1410-01  
HOS-001A (Control Products - 10 Pin)  
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 defrost  
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.  
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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  
Temperature 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.  
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  
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.  
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The green LED’s 1-4 represent the corresponding relays and energize and sequence 5  
seconds from initial startup as follows:  
Sequence Step  
1 Minute Fill Cycle  
Harvest Cycle  
Freeze Cycle  
Reverse Pump Out  
LED’s on Length: Min.  
LED4  
Max.  
Avg.  
60 sec.  
3-5 min.  
30-35 min.  
Factory set.  
LED1, 4, & 2  
LED1  
2 min.  
5 min.  
20 min.  
60 min.  
20 sec.  
LED1, 3, & 2  
10 sec.  
{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 headmaster,  
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 prop-  
erly, 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  
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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 ener-  
gized 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 HOSHIZAKI001 Board)  
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(Control Products HOS-001A Board)  
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[c] SEQUENCE  
1st Cycle  
3. Thermistor reads 48°F.  
1. Unit energized and Control Switch to “ICE”  
position. Water supply cycle starts.  
Defrost Timer starts counting.  
TANT  
e  
limited  
es.  
5. After the first 5 minutes in freeze cycle.  
Ready to complete freeze cycle when Float  
Switch circuit opens.  
4. Defrost Timer stops counting.  
Defrost cycle is completed and freeze cycle  
starts.  
IMPORTANT  
IMPORTANT  
Board never accepts freeze completion signal  
within the first 5 minutes in freeze cycle.  
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.  
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2nd Cycle and after with pump drain  
IMPORTANT  
Freeze cycle time is limited to 50 minutes even  
if Float Switch does not open.  
1. Float Switch opens and signals to complete  
freeze cycle.  
2. Drain timer stops counting.  
Pump drain is completed  
Drain timer starts counting.  
mistor reads 48° F.  
st Timer starts  
ng.  
ORTANT  
ve  
s limited to 6  
5. After the first 5 minutes in freeze cycle.  
Ready to complete freeze cycle when Float  
Switch circuit opens.  
4. Defrost Timer stops counting.  
Defrost cycle is completed and freeze cycle  
starts.  
IMPORTANT  
Board never accepts freeze completion signal  
within the first 5 minutes in freeze cycle.  
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.  
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2nd Cycle and after with no pump drain  
IMPORTANT  
Freeze cycle time is limited to 50 minutes even  
if Float Switch does not open.  
2. Thermistor reads 48° F.  
1. Float Switch opens and signals to complete  
freeze cycle.  
Defrost Timer starts counting.  
RTANT  
e  
limited to 6  
3. Defrost Timer stops counting.  
4. After the first 5 minutes in freeze cycle.  
Ready to complete freeze cycle when Float  
Switch circuit opens.  
Defrost cycle is completed and freeze cycle  
starts.  
IMPORTANT  
Board never accepts freeze completion signal  
within the first 5 minutes in freeze cycle.  
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.  
16  
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[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-2400SRF3  
KM-2400SRH3  
OFF OFF ON  
OFF OFF OFF OFF OFF OFF  
ON  
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.  
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1) Defrost Control  
A thermistor (Semiconductor) is used for a defrost control sensor. The resistance varies  
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 (k)  
14.401  
10.613  
6.000  
0
10  
32  
50  
70  
90  
3.871  
2.474  
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  
THERMISTOR.”  
(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 k. 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. 2  
No. 1  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
60 seconds  
90 seconds  
120 seconds  
180 seconds  
ON  
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3) Drain Timer  
The Drain Timer is factory-adjusted, and no adjustment is required.  
SETTING  
TIME  
Dip Switch  
Dip Switch  
No. 4  
No. 3  
T1  
T2  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
10 seconds  
10 seconds  
10 seconds  
20 seconds  
150 seconds  
180 seconds  
120 seconds  
180 seconds  
ON  
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 Pump Motor drains the Water Tank at the frequency determined by the Drain  
Counter. The Drain Counter is factory-adjusted to drain the Water Tank every 10 cycles,  
and no adjustment is required.  
SETTING  
FREQUENCY  
Dip Switch  
Dip Switch  
No. 6  
No. 5  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
every cycle  
every 2 cycles  
every 5 cycles  
every 10 cycles  
ON  
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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 50 min. (OFF, ON). Check the adjustment chart published in the Tech Specs for proper  
settings.  
SETTING  
TIME  
Dip Switch  
Dip Switch  
No. 10  
No. 9  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
60 min.  
70 min.  
50 min.  
60 min.  
ON  
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 con-  
tinuously even if the Ice Storage Bin is filled with ice. Setting in the prohib-  
ited 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 k- 3.5 kresistor to the Connector K3 (pins #1 and #2), and energize  
the unit.  
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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.  
Reconnect a 1.5 k- 3.5 kresistor 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.  
21  
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III. TECHNICAL INFORMATION  
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT  
22  
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2. WIRING DIAGRAM  
High Pressure Switch  
ACB-2UB09  
+21  
0
Cut-out 412  
PSIG  
Cut-in  
327 ± 21 PSIG  
23  
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3. TIMING CHART  
*1 Theicemakerdoesnotcompleteadefrostcycleinthefirst2or3minutes. SeeII. 2. [d]CONTROLSAND  
ADJUSTMENTS.”  
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*1 The Pump Motor waits for 2 seconds before starting a drain cycle. See “II. 2. [d] CONTROLS AND  
ADJUSTMENTS.”  
*2 Theicemakerdoesnotcompleteadefrostcycleinthefirst2or3minutes. SeeII. 2. [d]CONTROLSAND  
ADJUSTMENTS.”  
25  
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4. PERFORMANCE DATA  
KM-2400SRF3, KM-2400SRH3 (Remote air-cooled, 3 phase)  
Note: Pressure data is recorded at 5 minutes into freezing 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.  
26  
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IV. SERVICE DIAGNOSIS  
1. NO ICE PRODUCTION  
PROBLEM  
[1] The icemaker a) Power Supply  
will not start  
POSSIBLE CAUSE  
REMEDY  
1. Move to “ON” position.  
2. Tighten.  
3. Check for continuity and  
replace.  
1. “OFF” position.  
2. Loose connections.  
3. Bad contacts.  
4. Voltage too high.  
1. Blown out.  
4. Check and get  
recommended voltage.  
1. Check for short circuit  
and replace.  
1. Move to “ICE” position.  
2. Check for continuity and  
replace.  
b) Fuse (Inside Fused  
Disconnect, if any)  
c) Control Switch  
1. “OFF” position.  
2. Bad contacts.  
d) Bin Control  
Thermostat  
1. Tripped with bin filled  
with ice.  
1. Remove ice.  
2. Ambient temperature  
too cool.  
2. Increase ambient  
temperature.  
3. Set too warm.  
3. See “II.2.[d]  
CONTROLS AND  
ADJUSTMENTS, 6) Bin  
Control.”  
4. Bulb out of position.  
5. Bad contacts or leaks in  
bulb.  
4. Place in position.  
5. Check for continuity and  
replace.  
e) High Pressure  
Control  
1. Bad contacts.  
1. Check for continuity and  
replace.  
f) Transformer  
1. Thermal fuse blown out  
or coil winding opened.  
1. Loose connections or  
open.  
1. Leads short-circuit or  
open and High  
1. Replace.  
g) Wiring to  
Controller Board  
h) Thermistor  
1. Check for continuity and  
replace.  
1. See “II.2.[d] CONTROLS  
AND ADJUSTMENTS, 1)  
Defrost Control.”  
Temperature Safety  
operates.  
i) Hot Gas Solenoid  
Valve  
1. Continues to open in  
freeze cycle and High  
Temperature Safety  
operates.  
1. Check for power off in  
freeze cycle and replace.  
j) Water Supply Line  
1. Water supply off and  
water supply cycle does  
not finish.  
1. Check and get  
recommended  
pressure.  
2. Condenser water  
pressure too low or off  
and Pressure Control  
opens and closes fre-  
quently to finally operate  
High Temperature Safety.  
1. Mesh filter or orifice gets  
clogged and water supply  
cycle does not finish.  
2. Coil winding opened.  
3. Wiring to Water Valve.  
2. Check and get  
recommended  
pressure.  
k) Water Solenoid  
1. Clean.  
2. Replace.  
3. Check for loose  
connection or open, and  
replace.  
27  
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PROBLEM  
POSSIBLE CAUSE  
REMEDY  
l) Controller Board  
1. Defective.  
1. See “II.2[e] CHECKING  
CONTROLLER BOARD.”  
1. Move to “ON” position.  
2. Check for continuity and  
replace.  
m) Interlock Switch  
(Cleaning Valve)  
1. “OFF” position.  
2. Bad contacts.  
[2] Water  
a) Float switch  
1. Connector disconnected.  
1. Place in position.  
continues to  
be supplied,  
and the ice-  
2. Leads opened or defective 2. Check and replace.  
switch.  
3. Float does not move freely. 3. Clean or replace.  
maker will not b) Controller Board  
start.  
1. Defective.  
1. Replace.  
[3] Compressor  
will not start  
or stops  
a) Wash Switch  
1. “WASH” position.  
2. Bad contacts.  
1. Dirty Condenser.  
1. Move to “ICE” position.  
2. Check and replace.  
1. Clean.  
b)HighPressure  
Controller  
operating  
2. Ambient or condenser  
water temp. too warm.  
3. Refrigerant overcharged.  
2. Reduce ambient temp.  
3. Recharge.  
4. Condenser water pressure 4. Check and get  
too low or off.  
recommended pressure.  
5. Fan not operating.  
5. See chart 1 - [6].  
6. Refrigerant line or  
components plugged.  
1. Bad contacts.  
6. Clean and replace Drier.  
c) Overload Protector  
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  
close in freeze cycle and  
Overload Protector  
operates.  
4. Check Line Valve's  
operation in freeze cycle  
and replace.  
d)MagneticContactor  
e)Compressor  
1. Bad contacts.  
1. Check for continuity and  
replace.  
2. Replace.  
1. Check for loose  
connection or open, and  
replace.  
2. Coil winding opened.  
1. Wiring to Compressor.  
2. Defective.  
2. Replace.  
3. Protector tripped.  
1. Defective.  
3. Reduce temperature.  
1. See “II.2. [e] CHECKING  
CONTROLLER BOARD.”  
f)Controllerboard  
[4] Water  
a) Water Solenoid  
Valve  
1. Diaphragm does not close. 1. Check for water leaks  
with icemaker off.  
continues to  
be supplied in b) Controller Board  
freeze cycle.  
1. Defective.  
1. See “II.2.[e] CHECKING  
CONTROLLER BOARD.”  
28  
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PROBLEM  
[5] No water  
comes from  
Spray Tubes.  
Water Pump  
will not start, or  
freeze cycle  
time is too  
POSSIBLE CAUSE  
REMEDY  
a) Water Supply Line  
1. Water pressure too low and 1. Check and get  
water level in Water Tank  
too low.  
recommended pressure.  
b)WaterSolenoid  
Valve  
1. Dirty mesh filter or orifice  
and water level in Water  
Tank too low.  
1. Clean.  
c) Water System  
1. Water leaks.  
1. Check connections for  
water leaks, and replace.  
2. Clean.  
short.  
2. Clogged.  
3. Pump Out Check Valve  
leaking by.  
3. Check assembly and  
clean.  
d) Pump Motor  
1. Motor winding opened.  
2. Bearing worn out.  
3. Wiring to Pump Motor.  
1. Replace.  
2. Replace.  
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.”  
1. Replace.  
[6] Fan Motor will a) Fan Motor  
not start, or is  
1. Motor winding opened.  
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.  
5. Fan blade bound.  
1. Defective.  
4. Replace.  
5. Check and replace.  
1. See “II.2. [e] CHECKING  
CONTROLLER BOARD.”  
1. Check for leaks and  
recharge.  
b) Controller Board  
[7] All components a) Refrigerant  
run but no ice  
1. Undercharged.  
is produced.  
2. Air or moisture trapped.  
1. Defective valve.  
2. Replace Drier, and  
recharge.  
1. Replace.  
b) Compressor  
c) Hot Gas Solenoid  
1. Continues to open in freeze 1. Check and replace.  
cycle.  
Valve  
d) Line Valve  
1. Continues to close in  
freeze cycle.  
1. Check and replace  
e) Water Solenoid  
Valve  
1. Water Solenoid Valve is  
open during freeze.  
1. Check for water leaks  
with icemaker off.  
29  
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2. EVAPORATOR IS FROZEN UP  
PROBLEM  
[1] Freeze cycle a) Float Switch  
time is too  
POSSIBLE CAUSE  
REMEDY  
1. Check and replace.  
1. Leads short-circuit or  
defective switch.  
long.  
2. Float does not move freely. 2. Clean or replace.  
1. Diaphragm does not close. 1. Check for water leaks  
with icemaker off.  
b) Water Solenoid  
Valve  
c) Controller Board  
1. Defective.  
1. See “II.2[e] CHECKING  
CONTROLLER BOARD.”  
1. Clean.  
1. Check and get  
recommended pressure.  
1. Replace filter.  
[2] All ice formed a) Evaporator  
on Evaporator b) Water Supply Line  
does not fall  
1. Scaled up.  
1. Water pressure too low.  
into bin in  
c) Water Filter System 1. Dirty/Restricted.  
harvest cycle. d) Water Solenoid  
Valve  
1. Dirty mesh filter or orifice.  
1. Clean.  
e) Ambient and/or  
water temperature  
f) Line Valve  
1. Too cool.  
1. Increase temperature.  
1. Continues to open in  
harvest cycle.  
1. Out of position or loose  
attachment.  
1. Check operation in  
harvest cycle and replace.  
1. See “V. 9. REMOVAL  
AND REPLACEMENT OF  
THERMISTOR.”  
g)Thermistor  
h) Controller Board  
1. Defrost Timer is set too  
short.  
1. Adjust longer, referring  
to “II. 2. [d] CONTROLS  
AND ADJUSTMENT, 2)  
Defrost Timer.”  
2. Defective.  
2. See “II. 2.[e] CHECKING  
CONTROLLER BOARD.”  
1. Clean.  
[3] Others  
a) Spray Tubes  
1. Clogged.  
2. Out of position.  
1. Dirty.  
1. Undercharged.  
2. Place in position.  
1. Clean.  
1. Check for leaks and  
recharge.  
b) Water System  
c) Refrigerant  
d) Expansion Valve  
1. Bulb out of position or  
loose attachment.  
1. Place in position.  
2. Defective.  
2. Replace.  
e) Hot Gas Solenoid  
Valve  
1. Coil winding opened.  
2. Plunger does not move.  
3. Wiring to Hot Gas Valve.  
1. Replace.  
2. Replace.  
3. Check for loose  
connection or open, and  
replace.  
f) Water Supply Line  
g) Water filter  
1. Too small; requires 1/2" OD 1. Increase water line size.  
line dedicated per machine.  
1. Flow rate too small.  
1. Replace with filter that  
has larger flow rate.  
30  
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3. LOW ICE PRODUCTION  
PROBLEM  
POSSIBLE CAUSE  
REMEDY  
[1] Freeze cycle a) See chart 1 - [3], and check dirty Condenser, ambient or water  
time is long. temperature, water pressure, 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,  
or Hot Gas Valve.  
4. ABNORMAL ICE  
PROBLEM  
[1] Small Cube  
POSSIBLE CAUSE  
REMEDY  
1. Place in position.  
a) Ice Cube Guide  
1. Out of 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) Pump Out Check Valve 1. Dirty.  
1. Clean.  
[2] Cloudy or  
irregular cube  
a) See chart 2 - [1] and - [3], and check Float Switch, Water Solenoid Valve,  
Controller Board, Spray Tubes, water system, refrigerant charge or Expansion  
Valve.  
b) Spray Guide  
c) Water Quality  
1. Dirty.  
1. Clean.  
1. High hardness or contains 1. Install a water filter or  
impurities.  
softener.  
5. OTHERS  
PROBLEM  
POSSIBLE CAUSE  
REMEDY  
1. Adjust warmer.  
2. Replace.  
[1] Icemaker will a) Bin Control  
1. Set too cold.  
2. Defective.  
not stop when  
bin is filled  
with ice.  
Thermostat  
[2]Abnormal  
noise  
a) Pump Motor  
b) Fan Motor  
1. Bearings worn out.  
1. Bearings worn out.  
2. Fan blade deformed.  
3. Fan blade does not move  
freely.  
1. Replace.  
1. Replace.  
2. Replace fan blade.  
3. Replace.  
c) Compressor  
1. Bearings worn out, or  
cylinder valve broken.  
2. Mounting pad out of  
position.  
1. Replace.  
2. Reinstall  
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.  
b) Icemaker and Bin  
1. Drains not run separately.  
1. Separate the Drain Lines.  
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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.  
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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 Charge Label in the machine compartment. 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 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  
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.  
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 inside the Evaporator Case are clear-paint coated.  
Sandpaper the brazing connections before unbrazing the components. Use a good  
abrasive cloth to remove coating.  
33  
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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: 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 crankcase heater.  
6) Remove the Discharge and Suction Pipes.  
7) Remove the Hold-down Bolts, Washers and Rubber Grommets.  
8) Slide and remove the Compressor. Unpack the new Compressor package. Install the  
new Compressor.  
9) Place the Compressor in position, and secure it using the Bolts, Washers, and Rubber  
Grommets.  
10) Remove nuts from the Suction and Discharge.  
11) Tighten the Suction and Discharge nuts to 80ft-lbs and 68ft-lbs respectively, while  
purging with nitrogen gas flowing at the pressure 3-4 PSIG.  
12) Apply a thin coat of Dow Corning 340 Heat Sink Compound (Part# 8601-0113) to the  
crankcase heater, and insert it into the well.  
13) Install the new Filter Drier.  
14) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.  
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15) Evacuate the system, and charge it with refrigerant. See the Charge Label in the machine  
compartment for the required refrigerant charge.  
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.  
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. See the Charge Label in the machine  
compartment for the required refrigerant charge.  
8) Replace the panels in their correct positions.  
9) Turn on the power supply.  
35  
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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.  
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  
1. 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.  
2. Do not put a direct flame on the compressor insulation. A wet cloth or barrier  
may be needed.  
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. See the Charge Label in the machine  
compartment for the required refrigerant charge.  
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.  
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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.  
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  
1. 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.  
2. Do not put a direct flame on the compressor insulation. A wet cloth or barrier may  
be needed.  
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. See the Charge Label in the machine  
compartment for the required refrigerant charge.  
10) Cut the leads of the Solenoid allowing enough lead length to reconnect using closed end  
connectors.  
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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.  
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 pass 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. See the Charge Label in the machine  
compartment for the required refrigerant charge.  
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.  
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8. REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE  
REGULATOR (C.P.R.)  
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.  
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.  
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9. 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.  
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  
Fig. 1  
Thermistor. See Fig. 1.  
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.  
Secure it using the Thermistor Holder and recommended foam insulation.  
10) Secure the insulation using the Plastic Cable Ties.  
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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.  
10. 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.  
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.  
9) Turn on the power supply.  
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11. 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.  
12. REMOVAL AND REPLACEMENT OF PUMP MOTOR  
1) Turn off the power supply.  
2) Remove the Front Panel.  
3) Drain the Water Tank by removing the Insulation Panel  
and the cap at the front of the ice dropping hole.  
See Fig. 2.  
4) Replace the removed parts in their correct positions.  
5) Disconnect the Pump Suction and Discharge Hoses.  
6) Remove the screws and the Pump Motor Bracket.  
Fig. 2  
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7) Remove the closed end connectors from the Pump Motor leads.  
8) Remove the two screws and the Pump Motor Bracket.  
9) Remove the Pump Housing, and check the Impeller.  
10) If the Impeller is defective, install a new Impeller.  
11) Install the new motor or new parts, and replace the removed parts in the reverse order of  
which they were removed.  
12) Turn on the power supply, and check for leaks.  
13) 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 where they connect to the 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.  
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VI. CLEANING AND MAINTENANCE 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 subfreezing 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 subfreezing temperatures.  
[1] Remove the water from the potable water supply line:  
1) Remove the Front Panel.  
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.  
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[2] 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  
Insulation Panel and the Cap located  
on the front bottom part of the Ice  
Dropping Hole. See Fig. 3.  
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.  
Fig. 3  
7) Close the Drain Valve.  
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2. CLEANING PROCEDURE  
IMPORTANT  
Ensure all components, fasteners and thumbscrews are securely in place after  
any maintenance or cleaning is done to the equipment.  
WARNING  
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  
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.  
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[a] CLEANING PROCEDURE  
1) Dilute 38 fl. oz. of the recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY”  
(Economics Laboratory, Inc.) with 7 gal. 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, by first removing the  
thumbscrew, lifting the panel slightly and pulling it toward you.  
5) Drain the Water Tank by removing the Cap located on the front bottom part of the Ice  
Dropping Hole. See Fig. 3.  
6) After tank has drained, replace the removed parts in their correct positions.  
7) Pour the cleaning solution into the Water Tank.  
8) Fully open the Cleaning Valve on the left side wall of the machine compartment.  
9) Move the Control Switch, on the Control Box, to the “WASH” position.  
10) Replace the Insulation Panel and the Front Panel in their correct positions.  
11) Turn on the power supply, and start the washing process.  
12) Turn off the power supply after 30 minutes.  
13) Remove the Front Panel and the Insulation Panel.  
14) Drain the Water Tank. (See the above step 5).  
15) Replace the tubing and the Insulation Panel in their correct positions.  
16) Move the Control Switch to the “ICE” position.  
17) Close the Cleaning Valve.  
Note: The icemaker will not operate unless the Cleaning Valve is completely closed.  
18) Replace the Front Panel in its correct position.  
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19) Turn on the power supply to fill the Water Tank with water.  
20) Turn off the power supply after 3 to 5 minutes.  
21) Remove the Front Panel, and fully open the Cleaning Valve.  
22) Move the Control Switch to the “Wash” position.  
23) Replace the Front Panel in its correct position.  
24) Turn on the power supply to rinse off the cleaning solution.  
25) Turn off the power supply after 5 minutes.  
26) Remove the Front Panel and Insulation Panel.  
27) Drain the Water Tank by removing the Cap located on the front bottom part of the Ice  
Dropping Hole. See Fig. 3.  
28) 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 16) through 28) three more times to rinse thoroughly.  
Note: If you do not sanitize the icemaker, go to step 9) in “[b] SANITIZING  
PROCEDURE.”  
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[b] SANITIZING PROCEDURE - Following Cleaning Procedure  
1) Dilute a 5.25% Sodium Hypochlorite solution (chlorine bleach) with water (Add  
3.5 fl. oz. of sanitizer to 7 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 in the “Open” position.  
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.  
8) Drain the Water Tank. Refer to step 5) in “[a] CLEANING PROCEDURE.”  
9) Replace the removed parts and the Insulation Panel in their correct positions.  
10) Repeat steps 16) 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.  
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3. MAINTENANCE  
IMPORTANT  
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.  
3) 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  
Condenser.  
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