Hoshizaki America, Inc.
Hoshizaki
Commercial Refrigerators & Freezers
Undercounter & Worktop Series
Models
Refrigerators
HUR40A(-D) HWR40A(-D)
HUR68A(-D) HWR68A(-D)
HUR96A(-D) HWR96A(-D)
Freezers
HUF40A(-D) HWF40A(-D)
HUF68A(-D) HWF68A(-D)
SERVICE MANUAL
“A Superior Degree
of Reliability”
Number: 73123
Issued: 2-4-2005
Revised: 9-30-2008
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Please review this manual. It should be read carefully before the unit is serviced or
maintenance operations are performed. Only qualified service technicians should service
and maintain the unit. This manual should be made available to the technician prior to
service or maintenance.
CONTENTS
B. Dimensions................................................................................................................... 5
ꢀa. HWR40A-D, HWF40A-D....................................................................................... 7
4a. HWR68A-D, HWF68A-D....................................................................................... 9
5. HUR96A................................................................................................................ 10
ꢀ. Freezers – Continuous Operating Mode ............................................................. 15
3. Refrigerators – Energy Saving Operating Mode .................................................. 17
D. Settings and Diagnostics............................................................................................ ꢀ3
ꢀ. Temperature Display............................................................................................. ꢀ4
b) Defrost Termination Temperature (F1)............................................................ ꢀ7
f) Temperature Display Scale (F5)....................................................................... 30
h) Compressor Run Time (F7)............................................................................. 31
3
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E. Perimeter Frame Heater............................................................................................. 3ꢀ
A. Alarm Codes............................................................................................................... 33
1. Alarm Display Priority............................................................................................ 34
a. High Temperature Alarm (E1).......................................................................... 35
d. High Pressure Alarm (E4)................................................................................ 37
G. Removal and Replacement of Door Gasket............................................................... 53
H. Removal and Replacement of Defrost Heater............................................................ 53
J. Removal and Replacement of Fan Motors.................................................................. 55
V. Cleaning and Maintenance Instructions.......................................................................... 56
B. HUF40A(-D), HWF40A(-D)......................................................................................... 60
D. HUF68A(-D), HWF68A(-D)......................................................................................... 63
4
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I. Specifications
A. Nameplate Ratings
Design Pressure
(PSIG)
Refrigerant
(oz.)
Model
AC Supply Voltage Amperes
HI
LO
1ꢀ0
1ꢀ0
1ꢀ0
ꢀ50
ꢀ50
404A
134a
15.ꢀ
15.ꢀ
15.ꢀ
HUR40A(-D), HWR40A(-D)
HUR68A(-D), HWR68A(-D)
HUR96A(-D), HWR96A(-D)
HUF40A(-D), HWF40A(-D)
HUF68A(-D), HWF68A(-D)
115/60/1
115/60/1
115/60/1
115/60/1
115/60/1
5.0
5.0
6.0
5.5
ꢀ40
ꢀ40
ꢀ40
450
450
14.1
13.0
10.0
Undercounter Model Names
The undercounter models covered in this service manual initially had different model
names. If you have a unit with an auxiliary code of N-6 and a serial number ending in "H",
refer to the table below.
Model Name on Current
Nameplate
Name
UR1-SSB
HUR40A
URꢀ-SSB
UF1-SSB
UFꢀ-SSB
HUR68A
HUF40A
HUF68A
B. Dimensions
Door Opening mm
Total Refrigerated
Volume ft3
Total Shelf
Space ft2
Hotel Pan
Capacity (-D)
Model
Width
Height
HUR40A(-D), HWR40A(-D),
HUF40A(-D), HWF40A(-D)
8.5
7.6
4
HUR68A(-D), HWR68A(-D),
HUF68A(-D), HWF68A(-D)
570.ꢀ
616.ꢀ
18.8
ꢀ9.1
17.1
ꢀ6.6
8
HUR96A(-D), HWR96A(-D)
1ꢀ
5
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II. General Information
A. Construction
Hoshizaki undercounters feature a cartridge-type refrigeration unit that can be removed
without taking off the top and side panels.
Front Panel
Evaporator Assembly
Evaporator Case Cover
Evaporator Case
Side Panel
Control Box
Access Valve (Low-Side)
Compressor
Condenser
Capillary Tube/Suction
Line Assembly
Condenser Fan Motor
Compressor Base
Evaporator Case Cover
Thermal Fuse
Defrost Thermistor
Evaporator Shroud
Defrost Thermostat
Defrost Heater
Evaporator Fan Motor
Evaporator
Cabinet Thermistor
Evaporator Case
1ꢀ
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B. Sequence of Operation and Timing Charts
For details on operating modes, see "II.D.4. Operating Modes."
1. Refrigerators – Continuous Operating Mode
a) Sequence of Operation
POWER ON
2-minute Delay
1. Compressor start-up
ꢀ. Condenser fan start-up
Cycle Off (Cut-out
temperature reached)
[Minimum ꢀ minutes]
1. Compressor off
Board Self Check
1. Frame heater(s) on
ꢀ. Evaporator fan(s) on
ꢀ. Condenser fan off
Defrost End
Cycle On (Cut-on
Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
temperature reached)
[Minimum ꢀ minutes]
1. Compressor start-up
ꢀ. Condenser fan start-up
Defrost Start
Preprogrammed time interval
1. Compressor off
ꢀ. Evaporator fan(s) off
3. Frame heater(s) off (Q6 and later)
4. Condenser fan off
5. Defrost heater on
Defrost heater off
Continue as
normal cycling
6. "dF" displayed
Five minutes after
defrost heater off
1. Compressor on
ꢀ. Condenser fan on
Five minutes after
compressor start-up
1. Evaporator fan(s) on
ꢀ. Frame heater(s) on
(Q6 and later)
One minute after evaporator
fan start-up "dF" no
longer displayed, cabinet
temperature displayed
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."
ꢀ) The defrost thermistor reads the evaporator temperature.
3) There is a five second evaporator fan startup delay when the compressor and
fan would otherwise start together.
13
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b) Timing Chart
Refrigerators – Continuous Operating Mode
14
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2. Freezers – Continuous Operating Mode
a) Sequence of Operation
POWER ON
Cycle Off (Cut-out
temperature reached)
[Minimum ꢀ minutes]
1. Compressor off
Board Self Check
1. Frame heater(s) on
ꢀ. Evaporator fan(s) on
2 minute delay
1. Compressor start-up
ꢀ. Condenser fan start-up
ꢀ. Condenser fan off
Cycle On (Cut-on
Defrost end
temperature reached)
[Minimum ꢀ minutes]
1. Compressor start-up
ꢀ. Condenser fan start-up
Defrost thermistor
reaches defrost
termination
temperature, or defrost
timer reaches 1 hour
Defrost heater off
Defrost Start
Preprogrammed time interval
1. Compressor off
ꢀ. Evaporator fan(s) off
3. Condenser fan off
4. Defrost heater on
5. "dF" displayed
Continue as
normal cycling
Five minutes after
defrost heater off
1. Compressor on
ꢀ. Condenser fan on
Five minutes after
compressor start-up
1. Evaporator fan(s) on
Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."
ꢀ) The defrost thermistor reads the evaporator temperature.
3) There is a five second evaporator fan startup delay when the compressor and
fan would otherwise start together.
15
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b) Timing Chart
Freezers – Continuous Operating Mode
16
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3. Refrigerators – Energy Saving Operating Mode
a) Sequence of Operation
Cycle Off (Cut-out
temperature reached)
[Minimum ꢀ minutes]
1. Compressor off
ꢀ. Condenser fan off
3. Frame heater(s)
cycle on and off
(Q6 and later)
4. Evaporator fan(s)
cycles on and off
POWER ON
2-minute Delay
1. Compressor start-up
ꢀ. Condenser fan start-up
3. Frame heater(s) on
(continuously)
4. Evaporator fan(s) on
(continuously)
Board Self Check
1. Frame heater(s) on continuously
(Q5 and earlier)
Frame heater(s) cycle on and off
(Q6 and later)
ꢀ. Evaporator fan(s) cycles on and off
Cycle On (Cut-on
Defrost End
Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
temperature reached)
[Minimum ꢀ minutes]
1. Compressor start-up
ꢀ. Condenser fan start-up
3. Frame heater(s) on
(continuously)
Defrost Start
Preprogrammed time interval
1. Compressor off
ꢀ. Frame heater(s) off (Q6 and later)
3. Evaporator fan(s) off
4. Condenser fan off
5. Defrost heater on
Defrost heater off
4. Evaporator fan(s) on
(continuously)
Continue as
6. "dF" displayed
normal cycling
Five minutes after
defrost heater off
1. Compressor on
ꢀ. Condenser fan on
One minute after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed
Five minutes after
compressor start-up
1. Evaporator fan(s) on
ꢀ. Frame heater(s)
on (Q6 and later)
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet
thermistor."
ꢀ) The defrost thermistor reads the evaporator temperature.
17
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b) Timing Chart
Refrigerators – Energy Saving Operating Mode
*
*
18
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4. Freezers – Energy Saving Operating Mode
a) Sequence of Operation
POWER ON
Cycle Off (Cut-out
temperature reached)
[Minimum ꢀ minutes]
1. Compressor off
ꢀ. Condenser fan off
3. Evaporator fan(s)
cycles on and off
Board Self Check
1. Frame heater(s) on
ꢀ. Evaporator fan(s)
cycles on and off
2-minute Delay
1. Compressor start-up
ꢀ. Condenser fan start-up
3. Evaporator fan(s) on
(continuously)
Cycle On (Cut-on
Defrost End
Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off
temperature reached)
[Minimum ꢀ minutes]
1. Compressor start-up
ꢀ. Condenser fan start-up
3. Evaporator fan(s) on
(continuously)
Defrost Start
Preprogrammed time interval
1. Compressor off
ꢀ. Evaporator fan(s) off
3. Condenser fan off
4. Defrost heater on
5. "dF" displayed
Continue as
normal cycling
Five minutes after
defrost heater off
1. Compressor on
ꢀ. Condenser fan on
Five minutes after
compressor start-up
1. Evaporator fan(s) on
Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet
thermistor."
ꢀ) The defrost thermistor reads the evaporator temperature.
19
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b) Timing Chart
Freezers – Energy Saving Operating Mode
ꢀ0
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C. Control Board
• A Hoshizaki exclusive solid-state control board is employed in all Hoshizaki
refrigerators and freezers.
• All models are pretested and factory-adjusted.
CAUTION
1. Fragile, handle very carefully.
ꢀ. The control board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the 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 attempt to repair the board in the field. Always replace the whole
board assembly if it goes bad.
5. Do not short out power supply to test for voltage.
6. Keep the thermistor leads, clogged filter sensor leads, and pressure switch
leads at least 1.5" away from high voltage leads (AC 100 volts or more) to
protect against electrical noise.
1. Start-Up Delay
The start circuit of the compressor is timed such that at power-up and during any
compressor off time, there will be at least a ꢀ-minute delay before the compressor will
start. This delay is controlled through the control board. To bypass the startup delay,
move the power switch to the "OFF" position. Then press and hold the up arrow key
while moving the power switch to the "ON" position.
Note: The compressor must run a minimum of three minutes during each run cycle.
ꢀ1
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2. Control Board Layout
Rear
Front
K311 (6 pin)
Relay Wiring
Harness
SW 134
Raise
SW 135
Dis
Set
SW 133
wer
tpoint
Board Part
Number
LED 1ꢀ3
Lit for
Negative
Values
Board Part
Number
SW 13ꢀ
Manual
Defrost
Chip Revision
Kꢀ51 (5 pin)
(not used)
LED 1ꢀ4
SW 131
Energy
Saving/
Service
Button
Temperature
and Alarm
Display
K101 (3 pin)
Transformer
K151 (10 pin)
Thermistor
Wiring
Harness
Relays
(not used)
F101
3 Amp Fuse
(not used)
K361 (9 pin)
(not used)
Note: Fuse at position F101 on board is not currently used. The board can function
without this fuse.
Relay Wiring Harness (K311)
(brown) Compressor Relay
(red) Evaporator Fan Relay
(orange) Defrost Heater Relay
Thermistor Wiring Harness (K151)
(gray) Clogged Filter Sensor
(orange) Defrost Thermistor
(black) Cabinet Thermistor
(white) Jumper Wire (limits access to settings and
diagnostics menu - not present on all units)
(light blue) High Pressure Switch
ꢀꢀ
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D. Settings and Diagnostics
Various settings and diagnostic information can be controlled via the display panel. The
display panel is located behind the front panel. To open the front panel, grip the outer
edge of the panel near the top and bottom and pull it open. This permits access to the
display panel and control box. The unit has a ꢀ minute startup delay. To bypass the
startup delay, move the power switch to the "OFF" position. Then press and hold the up
arrow key while moving the power switch to the "ON" position. Follow the instructions
and warnings below and on the display panel for safe and efficient operation of the unit.
1. Gaining Access to Settings and Diagnostics
Generally, the only two settings that can change are the temperature display scale
(°F or °C) and the temperature setpoint. The restriction to these two settings is achieved
by the presence of a jumper between connector K151 pins 7 and 8 on the control board.
To access other settings, the jumper must be removed. To see if the jumper is present
press and hold both the
button and the
unmarked, blank button for 5 seconds. If
"F5" appears in the display window, the jumper is present and must be removed in order
to access other settings. If "F0" is displayed, no jumper is present and all settings are
unrestricted and accessible. See the rest of this section for details about each setting.
Note: If there is no input for 60 seconds, the display will revert to normal.
ꢀ3
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2. Temperature Display
• Displays the cabinet temperature. The factory setting is °F. To change the display to the
°C scale, see "a) Switching the Display Between Fahrenheit and Celsius (F5)" below.
• The cabinet temperature is updated every 30 seconds.
• During defrost, "dF" is displayed in place of the cabinet temperature.
a) Switching the Display Between Fahrenheit and Celsius (F5)
The factory setting is °F. To change the display to °C, follow the steps below.
1) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F5" appears in the display window. (If "F0" is displayed, press the MANUAL
DEFROST button until "F5" appears.)
ꢀ) Press the
the up or
unmarked, blank button to display the current setting (default: "F"). Press
down button to switch to °C. Press the
unmarked, blank button
again to save the setting.
3) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
The cabinet temperature will be displayed using the newly saved temperature scale.
4) Affix the "°C" label supplied with the unit to the display panel, covering "°F" but not the
display window.
b) Adjusting the Setpoint Temperature
The setpoint temperature is the temperature at which the compressor turns on. To set
the setpoint temperature, follow the steps below.
1) Press the
button to display the current setpoint temperature.
ꢀ) To change the setpoint, press and hold the
down button to raise or lower the setpoint.
button while pressing the
up or
Model
Allowable Setpoint Range
Default
39°F
(4°C)
37°F
(3°C)
0°F
(-18°C)
ꢀ°F
(-17°C)
Refrigerator (auxiliary code Q5 and earlier)
+ꢀ1 to +53°F
(-6 to +1ꢀ°C)
Refrigerator (auxiliary code Q6 and later)
Freezer (Door)
-13 to +19°F
(-ꢀ5 to -7°C)
Freezer (Drawer)
3) After 10 seconds, the new setpoint will be saved automatically.
Note: For refrigerators, the temperature differential for the compressor to turn off is
-4.5°F (-ꢀ.5°C) for auxiliary code Q5 and earlier and -3.6°F (-ꢀ.0°C) for auxiliary
code Q6 and later. For 1-section freezers, it is -6.3°F (-3.5°C) and for ꢀ-section
freezers, it is -3.6°F (-ꢀ.0°C).
ꢀ4
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c) Cabinet Temperature Correction (calibration factor)
In cases where there is a discrepancy between the actual cabinet center temperature
and the displayed temperature for a particular model, a calibration factor is used to
correct the displayed temperature.
WARNING
This unit has been factory tested with the default settings listed. Avoid using
this function except to confirm that the setting is correct. If set incorrectly, the
display could show an acceptable temperature even though the temperature
is out of the proper range. This value should only be changed after consulting
with the factory.
To view the current value, follow the steps below.
1) Turn the power on while pressing the
up button. The current correction calibration
factor will be shown. If "18" is displayed, the value is 1.8°F (1.0°C). See the table below
for the default values.
Cabinet Temperature Correction (Calibration Factor)
Default
1-Section 2-Section
00 (0.0°F)
(00 (0.0°C))
18 (1.8°F) 45 (4.5°F)
(10 (1.0°C)) (ꢀ5 (ꢀ.5°C))
Model
Setting Range
3-Section
36 (3.6°F)
( ꢀ0 (ꢀ.0°C))
Refrigerator
Freezer
-9.9 to 9.9°F in 0.9°F increments
(-9.5 to 9.5°C in 0.5°C increments)
ꢀ) If it is determined through discussion with the factory that the setting needs to be
changed, press the up or down button to increase or decrease the value.
3) Press the button to save the new value.
4) Turn the power off and then back on. The unit will start running with the new value.
[Example]
When the average cabinet temperature is 5.4°F
(3.0°C) higher than the thermistor detected
temperature, change the correction calibration
factor to 5.4°F (3.0°C).
ꢀ5
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3. Settings and Diagnostics Menu
To gain access to the settings, see "II.D.1. Gaining Access to Settings and Diagnostics."
Once inside this menu, press the MANUAL DEFROST button to scroll through the menu
and the
unmarked, blank button at any point to view the current setting. Press the
MANUAL DEFROST button to return to the menu screen.
Default
Refrigerator
Auxiliary Code
Freezer
Q5 and
earlier
6
Q6 and
later
1
2
Code Item
F0 Defrost Interval
Setting and Display Range
1 to 1ꢀ hours in 1 hour increments
section
section
6
6
F1 Defrost Termination Refrigerator: 59 to 68°F (15 to ꢀ0°C) in
Temperature
one degree increments
59°F
59°F
41°F
Freezer: 41 to 68°F (5 to ꢀ0°C) in one
degree increments
Fꢀ Setpoint
0 to 6.3°F in increments of .9°F
(0 to 3.5°C in increments of .5°C)
0°F, -45°F 0°F, -36°F 0°F, -63°F 0°F, -36°F
Temperature
Differential
(0°C,
(ꢀ.0, -
ꢀ.0°C)
(0°C,
(ꢀ.0,
-ꢀ.5°C )
-3.5°C)
-ꢀ.0°C)
(upper and lower)
(decimal (decimal (decimal (decimal
is not is not is not is not
displayed) displayed) displayed) displayed)
F3 High Temperature 0 to 180 minutes in 60 minute
Alarm Delay Time increments
ꢀ
ꢀ
ꢀ
(0=0; 1=60; ꢀ=1ꢀ0; 3=180 minutes)
F4 Low Temperature 0 or 60 minutes
Alarm Delay Time (0=0; 1=60 minutes)
1
1
1
F5 Temperature Dis-
play
Fahrenheit or Celsius
°F
°F
°F
F6 Alarm History
Displays alarm history - maximum 8
alarms
Displays run time between two most
recent defrosts
NA
NA
NA
NA
NA
NA
F7 Compressor Run
Time
F8 Not Used
F9 Not Used
NA
NA
NA
NA
NA
NA
ꢀ6
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a) Defrost Interval (F0)
This unit is preset at the factory to defrost once every 6 hours for general conditions.
However, if it is determined that this interval does not suit actual conditions, the interval
can be changed. To change the defrost interval, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
If "F0" is not displayed, press the MANUAL DEFROST button until "F0" appears in the
display window.
3) Press the
the up or
unmarked, blank button to display the current setting (default: "6"). Press
down button to increase or decrease the number of hours between
each defrost. The interval can be from 1 to 1ꢀ hours in increments of 1 hour.
4) Press the unmarked, blank button to save the setting.
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8 , reconnect it after all
setting and diagnostic work is complete.
Note:
• The defrost is a heated defrost, and therefore has a tendency to raise cabinet
temperature.
• When the unit goes into defrost during energy saving mode, evaporator fan(s)
and/or perimeter frame heaters will turn off.
• Cabinet temperature is not displayed during defrost; "dF" is displayed in its place.
• The change in the defrost setting will take effect immediately. The next defrost will
take place after the newly set time interval has elapsed.
• Initiating a manual defrost will restart the defrost timer.
• The evaporator temperature must be below the defrost completion temperature for
any defrost (manual or auto) to be initiated.
b) Defrost Termination Temperature (F1)
To change the defrost termination temperature, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F1" appears in the display window.
ꢀ7
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3) Press the
unmarked, blank button to display the current setting. Press the
up or
down button to increase or decrease the defrost termination temperature.
Note: The defrost termination temperatures can be adjusted within the following ranges:
• Refrigerator: 59 to 68°F (15 to ꢀ0°C) in one degree increments
• Freezer: 41 to 68°F (5 to ꢀ0°C) in one degree increments
4) Press the
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
unmarked, blank button to save the setting.
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
c) Setpoint Temperature Differential (F2)
To change the differential, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"Fꢀ" appears in the display window.
3) Press the
unmarked, blank button to display the current + setting (the decimal
up or down button to increase or
between the digits is not shown). Press the
decrease the + (plus) differential in .9°F increments.
Note:
• Both the + and - values can be adjusted between 0.0 and 6.3°F in .9°F increments
(0.0 to 3.5°C in .5°C increments).
• You cannot set both + and - to 0.0.
4) Press the
unmarked, blank button to save the + setting and move to the - (minus)
differential setting.
5) Press the up or
down button to increase or decrease the - (minus) differential in
.9F increments.
Note:
• Both the + and - values can be adjusted between 0.0 and 6.3°F in .9°F increments
(0.0 to 3.5°C in .5°C increments).
• You cannot set both + and - to 0.0.
6) Press the
unmarked, blank button to save the - (minus) setting. The - (minus) sign
will turn off and the display will change to the + (plus) differential setting.
7) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the
button and the
unmarked, blank button for 5 seconds to exit the setting
mode and return to the temperature display.
8) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
ꢀ8
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d) High Temperature Alarm Delay Time (F3)
To change the high temperature alarm delay time, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F3" appears in the display window.
3) Press the
unmarked, blank button to display the current setting. Press the
up or
down button to increase or decrease the high temperature alarm delay time.
Note: The time can be adjusted between 0 and 180 minutes in 60 minute increments.
The display corresponds to time as follows:
Display Detection Time
(minutes)
0
1
ꢀ
3
0
60
1ꢀ0
180
4) Press the
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
unmarked, blank button to save the setting.
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
e) Low Temperature Alarm Delay Time (F4)
To change the low temperature alarm delay time, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F4" appears in the display window.
3) Press the
down button to increase or decrease the low temperature alarm delay time.
Note: The time can be 0 or 60 minutes. The display corresponds to time as follows:
unmarked, blank button to display the current setting. Press the
up or
Display
Detection Time
(minutes)
0
1
0
60
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4) Press the
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
unmarked, blank button to save the setting.
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
f) Temperature Display Scale (F5)
For information about switching the display between °F and °C, see "D.ꢀ.a) Switching
the Display Between Fahrenheit and Celsius (F5)."
g) Alarm History (F6)
To view the alarm history, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F6" appears in the display window.
3) Press the
unmarked, blank button to display the alarm history. The alarms will be
displayed in reverse chronological order (newest to oldest - up to 8 alarms). When "--"
is displayed, you have reached the end of the alarm history and the display will begin
again.
Note: The alarms are as follows:
Alarm Code Description
E1
Eꢀ
E3
E4
High Temperature Alarm
Low Temperature Alarm
Defrost Alarm
High Pressure Alarm
E7
Clogged Filter Alarm
E8
E9
EA
ED
Defrost Temperature Sensor Malfunction Alarm
Clogged Filter Sensor Malfunction Alarm
EEPROM Write Error Alarm
EEPROM Verification or Read Error Alarm
4) To reset the alarm history, press and hold both the
MANUAL DEFROST button for 5 seconds.
unmarked, blank button and the
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
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h) Compressor Run Time (F7)
To display the compressor run time between the two most recent defrosts, follow the
steps below.
1) Make sure the jumper is removed between the connector K151 pins 7 and 8 on the
control board. Otherwise you will not be able to access this feature.
ꢀ) Press and hold both the
button and the
unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F7" appears in the display window.
3) Press the
unmarked, blank button to display the run time. The number displayed
indicates what percent of the time the compressor was running.
4) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the
button and the
unmarked, blank button for 5 seconds to exit the setting
mode and return to the temperature display.
5) If a jumper was present between connector K151 pins 7 and 8, reconnect it after all
setting and diagnostic work is complete.
4. Operating Modes
Hoshizaki undercounters and worktops feature two operating modes, energy saving and
continuous. Always use the default setting of your unit. To determine the default setting
of your unit, see the chart below.
Model
Default Setting
Refrigerator (auxiliary code Q5 and earlier)
Refrigerator (auxiliary code Q6 and later)
Freezer - 1 section
Continuous Operating Mode
Energy Saving Operating Mode
Continuous Operating Mode
Energy Saving Operating Mode
Freezer - ꢀ section
To determine the operating mode your unit is in, look at the unit's cabinet temperature
display. If a period does not appear after the temperature, the unit is in continuous
operating mode. If a period appears after the temperature, the unit is in energy saving
operating mode.
To switch between operating modes, press and hold the
5 seconds.
unmarked, blank button for
Note: It takes 5 seconds for this setting to be saved. Once saved, the setting you made
will be remembered even if the power is turned off.
Continuous
Energy Saving
(no period after temperature)
(period after temperature)
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a) Continuous
The evaporator fan runs constantly (except in defrost). The frame heaters are on
continuously.
b) Energy Saving
The evaporator fan runs when the compressor is on, but only intermittently when
the compressor is off. The frame heaters cycle on and off with the evaporator fan
for refrigerators auxiliary code Q6 and later, but are on continuously for refrigerators
auxiliary code Q5 and earlier and all freezers. Intermittent fan operation saves energy by
reducing heat leak, especially around the gasket, and by extending compressor off time.
Fan on/off time is dependent on the setpoint temperature.
Off Time
On Time
Model
Setpoint Temperature (seconds) (seconds)
ꢀ3 to 30°F
(-5 to -1°C)
3ꢀ to 5ꢀ°F
(0 to 11°C)
-13 to +19°F
(-ꢀ5 to -7°C)
90
150
30
15
15
30
Refrigerator
Freezer
c) Automatic Corrections Made During Energy Saving Operating Mode
(1) Temperature Display Correction
When the unit is in energy saving mode and the evaporator fan shuts off, the
temperature at the cabinet thermistor drops due to its close proximity to the evaporator.
Therefore, the temperature at the cabinet thermistor does not accurately reflect the
true cabinet temperature. To compensate for this, the cabinet temperature registered
at compressor shutoff is displayed for 1ꢀ0 seconds after shutoff when in energy saving
mode. After 1ꢀ0 seconds, the cabinet temperature plus 1.8°F (1°C) will be displayed.
Once the compressor turns back on, the display will return to the normal display.
(2) Temperature Differential Correction
During energy saving mode, the cabinet temperature tends to be higher than during
normal operation because the evaporator fan operates only intermittently when the
compressor is off. The upper setpoint differential for turning the compressor on is
automatically adjusted to compensate.
E. Perimeter Frame Heater
This unit is equipped with a perimeter frame heater. This prevents the formation of
condensate on the front frame of the unit under high humidity conditions.
Note: On refrigerators with auxiliary code Q6 and later, perimeter frame heater(s)
operate together with the evaporator fan(s).
3ꢀ
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III. Service Diagnosis
A. Alarm Codes
If an error occurs, the alarm code and cabinet temperature are displayed in 1-second
intervals. See the table below for a general description of the problem, then see the rest
of this section for detailed instructions.
Alarm Signals
Alarm Code Problem
High Temperature Alarm
Notes
When temperature returns to setpoint range,
alarm code "E1" will clear.
Cabinet temperature has exceeded set
E1
temperature by 14.4°F (10°C) for more than
The value of x can be changed under F3 on the
x hours. The default value of x is "ꢀ" (ꢀ hours). Settings and Diagnostics Menu.
(0=No delay; 1=1 hour; ꢀ=ꢀ hours; 3=3 hours)
Low Temperature Alarm
When temperature returns to setpoint range,
alarm code "Eꢀ" will clear.
Cabinet temperature has remained below
setpoint by 9°F (5°C) for more than y hours.
The default value of y is "1" (1 hour).
E2
E3
E4
The value of y can be changed under F4 on the
Settings and Diagnostics Menu.
(0=No delay; 1=hour)
Defrost Alarm
E3 may alternate with "dF" instead of the
temperature.
Defrost has taken longer than 1 hour. Control
board has terminated defrost.
High Pressure Alarm
Clean filter if necessary. Allow time for
pressure switch to react, then turn power off
and back on again to reset.
Compressor discharge pressure is outside
normal operating range. Pressure switch has
been triggered 5 or more times in 1 hour.
Condenser filter may need cleaning.
If switch trips 5 times in 1 hour, and the
above steps do not clear alarm code, see the
procedure contained in this section.
Clogged Filter Alarm
Clean filter. Allow time for sensor to react, then
turn power off and back on again to reset.
E7
Condenser temperature is outside of normal
operating range. Condenser filter needs
cleaning.
Defrost Temperature Sensor Malfunction Alarm After replacing sensor, alarm will reset.
E8
E9
EA
ED
Defrost temperature sensor has failed.
Clogged Filter Sensor Malfunction Alarm
After replacing sensor, alarm will reset.
Clogged filter sensor has failed.
EEPROM Write Error Alarm
After replacing the control board, alarm will
reset.
Control board is defective.
EEPROM Verification or Read Error Alarm
After replacing the control board, alarm will
reset.
Control board is defective.
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1. Alarm Display Priority
If multiple alarms occur simultaneously, only the alarm with the higher priority is
displayed.
Error Code Priority
Description
ED
EA
1
ꢀ
EEPROM Verification or Read Error Alarm
EEPROM Write Error Alarm
Defrost Temperature Sensor Malfunction
Alarm
E8
3
E9
E4
E7
E3
E1
Eꢀ
4
5
6
7
8
9
Clogged Filter Sensor Malfunction Alarm
High Pressure Alarm
Clogged Filter Alarm
Defrost Alarm
High Temperature Alarm
Low Temperature Alarm
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2. Alarm Details and Countermeasures
a. High Temperature Alarm (E1)
If the cabinet temperature exceeds the setpoint temperature by 14.4°F (8°C) or more for
more than x hours, "E1" is displayed. The default value of x is "ꢀ" (ꢀ hours). The value
of x can be changed under F3 on the Settings and Diagnostics Menu. (0=No delay; 1=1;
ꢀ=ꢀ; 3=3 hours)
Note:
• After the machine has been turned off and then turned back on, the high
temperature alarm feature is not active until the cabinet temperature reaches the
lower setpoint temperature differential.
• The high temperature alarm feature operates even during defrost.
Reset Options
The alarm will automatically reset once the cabinet temperature reaches the lower setpoint
temperature differential.
Possible Causes
• The door is opened frequently or is not completely closed.
• Trouble with the compressor or a gas leak.
• Trouble with the cabinet thermistor (black).
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b. Low Temperature Alarm (E2)
If the cabinet temperature drops below the setpoint temperature by 9°F (5°C) or more for
more than y minutes, "Eꢀ" is displayed. The default value of y is "1" (1 hour). The value
of y can be changed under F4 on the Settings and Diagnostics Menu. (0=No delay; 1=1
hour)
Note:
• The low temperature alarm timer starts once the cabinet temperature drops 9°F
(5°C) below the setpoint temperature.
• The low temperature alarm feature operates even during defrost.
Reset Options
The alarm will automatically reset once the cabinet temperature reaches the upper setpoint
temperature differential.
Possible Causes
• Ambient temperature is low.
• Trouble with the cabinet thermistor (black).
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c. Defrost Alarm (E3)
If the defrost thermistor does not turn off in one hour after defrost begins, "E3" is
displayed. When "E3" is displayed, the next step in the defrost termination process
(drain - fan delay - defrost display delay) begins.
Reset Options
To reset the alarm, turn the unit off and then back on.
Possible Causes
• Trouble with the defrost heater.
• The temperature fuse is blown.
• Trouble with the defrost thermistor (orange).
d. High Pressure Alarm (E4)
In order to protect the compressor if the discharge pressure reaches a preset value
(outside the normal operating range), a switch will temporarily stop the compressor.
At another preset pressure, the compressor will attempt to restart. If the switch is
triggered 5 or more times in one hour, "E4" will be displayed.
Reset Options
To reset the alarm, turn the unit off and then back on.
Possible Causes
• The condenser air filter is dirty.
• There is blockage or contamination inside the capillary tube or elsewhere in the
refrigeration circuit.
• The condenser fan motor is locked or otherwise not functioning.
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e. Clogged Filter Alarm (E7)
The unit is equipped with a filter for protecting the condenser from dirt, oils, grease, etc.
The filter promotes clean condenser surfaces and efficient operation and should be
checked twice monthly and cleaned when necessary. The unit is also equipped with a
sensor to determine if this filter is excessively dirty. If the unit detects that the condenser
filter is excessively dirty by sensing a temperature at the condenser outlet of at least
136.4°F (58°C) for over ꢀ minutes, "E7" will be displayed.
Reset Options
After cleaning the filter, the alarm will automatically reset once the temperature at the
condenser outlet drops below 136.4°F (58°C).
Possible Causes
• The condenser air filter is dirty.
• The condenser fan motor is locked or otherwise not functioning.
IMPORTANT
If this alarm occurs frequently, the compressor discharge temperature is
consistently too high.
Note:
• If the unit is turned off and then back on while the alarm code is displayed, the
alarm may be reset even if the filter is not yet clean. However, the alarm will recur
once the compressor discharge temperature reaches 136.4°F (58°C).
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f. Defrost Temperature Sensor Malfunction Alarm (E8)
If input from the defrost thermistor is below the defrost open circuit detection point
(equivalent to -67°F (-55°C)), "E8" is displayed. "E8" is also displayed when input
from the defrost thermistor is above the defrost thermistor short circuit detection point
(equivalent to 1ꢀꢀ°F (50°C)) for 10 minutes or more.
Note:
• If this alarm appears, first make sure that the sensor is properly connected.
• A short circuit will not be detected during the first hour after power is turned on.
However, a short circuit can be detected immediately by turning on the power
while pressing the
button. In this case, "E8" will be displayed immediately if a
short circuit is detected.
• A short circuit will not be detected during defrost or fan delay.
Reset Options
The alarm automatically resets when one of the following conditions is met:
• The input from the defrost thermistor exceeds the open circuit detection point (equivalent
to -67°F (-55°C)).
• The input from the defrost thermistor drops below the short circuit detection point
(equivalent to 1ꢀꢀ°F (50°C)).
• A functioning defrost thermistor (orange) is installed.
Possible Causes
• Trouble with the defrost thermistor (orange).
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g. Clogged Filter Sensor Malfunction Alarm (E9)
If the input from the clogged filter sensor is below the clogged filter sensor open circuit
detection point (equivalent to -7.6°F (-ꢀꢀ°C)), "E9" is displayed. "E9" is also displayed
when input from the clogged filter sensor is above the clogged filter sensor short circuit
detection point (equivalent to 186.8°F (86°C)) for 10 minutes or more.
Note:
• If this alarm appears, first make sure that the sensor is properly connected.
• A short circuit can be detected immediately by turning on the power while pressing
the
button. In this case, "E9" will be displayed immediately if a short circuit is
detected.
Reset Options
The alarm automatically resets when one of the following conditions is met:
• The input from the clogged filter sensor exceeds the open circuit detection point
(equivalent to -7.6°F (-ꢀꢀ°C)).
• The input from the clogged filter sensor drops below the short circuit detection point
(equivalent to 186.8°F (86°C)).
• A functioning clogged filter sensor (gray) is installed.
Possible Causes
• Trouble with the clogged filter sensor (gray).
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h. Control Board Error Alarms (EA and ED)
"EA" is displayed when an EEPROM write error is detected. "ED" is displayed when an
EEPROM verification or read error is detected.
Reset Options
Replacing the control board with a functioning replacement control board will eliminate this
error condition.
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B. Diagnosis Chart
Problem
Possible Cause
Remedy
[1] Compressor will a)Power Supply
not start—no
1. "OFF" position.
ꢀ. Loose connection(s). ꢀ. Tighten or reconnect.
3. Failure.
1. Defective.
1. Tripped.
1. Move to "ON" position.
current draw.
3. Call electrician.
1. Replace.
b)Cord and Plug
c) Circuit Breaker
(kitchen)
1. Check and reset. Call
electrician if breaker trips
repeatedly.
ꢀ. Defective.
ꢀ. Call electrician.
d)Transformer
1. Open coil winding.
1. Check continuity and replace.
e)Wiring to Control Board 1. Loose connection(s). 1. Tighten.
ꢀ. Faulty.
ꢀ. Check continuity and replace.
f) Voltage
1. Too low.
ꢀ. Too high.
1. Call electrician.
ꢀ. Call electrician.
g)High Pressure Switch 1. Bad contacts.
1. Check continuity and replace.
ꢀ. Has operated 5 or
more times in one
hour. (E4 should be
displayed)
ꢀ. Determine why pressure
switch is activated.
h)Thermistor
i) Control Board
1. Defective.
1. Defective.
1. Check and replace.
1. Replace control board.
j) Compressor Overload 1. Defective. (Contacts 1. Replace.
open)
k) Compressor
l) Relay (Condensing
Unit)
1. Open windings.
1. Bad contacts.
ꢀ. Open coil winding.
1. Too low.
1. Check continuity and replace.
1. Replace.
ꢀ. Check and replace.
1. Call electrician.
1. Replace.
ꢀ. Replace.
1. Replace.
1. Check and replace.
1. Call electrician.
ꢀ. Call electrician.
1. Clean filter.
[ꢀ] Compressor will a)Voltage
not run—draws
current and trips
on overload.
b)Start Relay
1. Bad contacts.
ꢀ. Open coil windings.
1. Locked rotor.
1. Defective.
1. Too low.
ꢀ. Too high.
c) Compressor
d)Start Capacitor
[3] Compressor runs a)Voltage
intermittently and
trips on overload.
b)Condenser Filter
1. Clogged.
c) Refrigerant Line or
Component
1. Plugged or restricted. 1. Clean and replace drier. Clean
and replace capillary tube heat
exchanger assembly.
d)Condenser Fan Motor 1. Failed.
1. Replace.
e)Refrigerant
1. Overcharged.
1. Evacuate and recharge.
ꢀ. Non-condensibles in ꢀ. Evacuate and recharge.
system.
f) Location of Unit
1. Restricted air flow to 1. Move unit or increase
condenser.
1. Defective.
1. Defective.
1. Defective.
ventilation.
[4] Cabinet
temperature too
a)Thermistor
b)Compressor Relay
c) Control Board
1. Check and replace.
1. Check and replace.
1. Replace.
high; compressor
will not start.
4ꢀ
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Problem
Possible Cause
Remedy
[5] Cabinet
a)Setpoint and/or
Differential
1. Incorrect.
1. Correct setting(s).
temperature too
high.
See sections "II.D.ꢀ.b)" and
"II.D.3.c)" for defaults.
b)Door
1. Not sealing, opened
frequently or open for
long intervals.
1. Check for sealing, check for
door open at time of warm
cabinet temperature.
c) Defrost
1. Defrost time
insufficient to remove
frost.
1. See "[8] Evaporator does
not defrost completely."
Operation in humid
conditions.
d)Refrigerant
e)Fan Motor
f) Air Filter
g)Condenser
h)Thermistor
1. Leak.
1. Repair leak and recharge.
1. Check and replace.
1. Clean.
1. Clean.
1. Check and replace.
1. Replace.
1. Defective.
1. Clogged.
1. Dirty.
1. Defective.
1. Defective.
1. Too close to unit.
i) Control Board
j) Outside Heat Source
1. Separate unit from heat
source.
k) Air Flow
1. Blockage inside
interior.
1. Remove blocakge by removing
or redistributing food product.
l) Warm Food
a)Power Supply
1. Warm food recently
placed in refrigerator.
1. "OFF" position.
1. Allow time for unit to return to
setpoint temperature.
1. Move to "ON" position.
[6] Cabinet
temperature
display
indicator does
not illuminate
properly.
ꢀ. Loose connection(s). ꢀ. Tighten or reconnect.
3. Failure or tripped
breaker.
3. Call electrician and/or reset
breaker.
b)Control Board
1. Defective.
1. Replace.
[7] Cabinet
a)Setpoint and/or
Differential
1. Incorrect.
1. Correct setting(s).
temperature too
low.
See sections "II.D.ꢀ.b)" and
"II.D.3.c)" for defaults.
b)Frozen Food
1. Frozen food recently 1. Allow time for unit to return to
placed in refrigerator.
1. Defective.
1. Defective; contacts
welded.
setpoint temperature.
1. Check and replace.
1. Replace.
c) Thermistor
d)Compressor Relay
e)Control Board
[8] Evaporator does a)Defrost Thermistor
1. Defective.
1. Defective.
1. Replace.
1. Check and replace.
not defrost
completely.
b)Defrost
1. Not enough defrosts 1. Factory default is once every
occurring per day.
Operation in humid
conditions.
6 hours. If coil is frosting too
much, can shorten defrost
interval.
c) Defrost Heaters
1. Defective.
1. Replace heaters.
d)Safety Defrost
Thermostat
1. Defective, turning off 1. Replace safety defrost
heaters prematurely,
or fused open.
thermostat.
e)Defrost Heater
Temperature Fuse
1. Blown.
1. Determine why fuse blew.
Replace fuse.
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Problem
[9] Defrost cycle
lasts too long.
Possible Cause
a)Defrost Thermistor
b)Control Board
c) Defrost
Remedy
1. Replace.
1. Replace.
1. Defective.
1. Defective.
1. Not enough defrosts 1. Factory default is once every
occurring per day.
Operation in humid
conditions.
6 hours. If coil is frosting too
much, can shorten defrost
interval.
d)Defrost Heater
1. Defective.
1. Replace heaters.
e)Safety Defrost
Thermostat
1. Defective, turning off 1. Replace safety defrost
heaters prematurely,
or fused open.
thermostat.
[10]Condensate
water overflow.
a)Cabinet Contents
1. Loading of large
volumes of warm,
moist, uncovered
product.
1. Cover product with plastic
wrap.
b)Location of Unit
c) Seals
1. Unit located near high 1. Relocate.
humidity source such
as fryer, steamer, etc.
1. Poor sealing around 1. Adjust or replace.
evaporator, door
gaskets.
d)Environment
1. Extreme environment 1. Adjust conditions.
and door-opening
conditions.
[11]Abnormal Noise a)Fasteners
b)Compressor
1. Loose fasteners allow 1. Tighten fasteners.
vibration of part.
1. Problem with mount. 1. Properly mount compressor.
Replace any missing
grommets.
ꢀ. Floodback to
compressor.
ꢀ. Check for signs of floodback
to compressor. Evacuate and
recharge if necessary.
3. Defective.
3. Replace.
c) Fan
1. Fan blade loose.
ꢀ. Defective motor.
1. Chattering.
1. Adjust and tighten.
ꢀ. Replace.
1. Replace.
d)Relay
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C. Thermistor Check
A thermistor (semiconductor) is used for the cabinet control sensor and defrost termination
sensor. The resistance varies depending on temperature. No adjustment is required. If
necessary, check for resistance between thermistor leads and visually check the thermistor
mounting.
Temperature
Resistance (kΩ)
°F
°C Cabinet/Defrost Thermistors Clogged Filter Thermistor
0
-17.8
14.ꢀ
10.7
6.0
3.9
ꢀ.5
-
-
10 -1ꢀ.ꢀ
3ꢀ
50
70
90
0.0
160
100
59
36
10.0
ꢀ1.1
3ꢀ.ꢀ
1.6
Cabinet & Defrost Thermistor T-R Curve
Clogged Filter Thermistor T-R Curve
Temperature °F (°C)
Temperature °F (°C)
To check a thermistor's resistance, follow the steps below.
1) Disconnect the connector for the thermistor in question under the control box and
behind the wire guard.
ꢀ) Remove the thermistor. See "IV.F. Removal and Replacement of Thermistors."
3) Immerse the thermistor sensor portion in a glass or cup containing ice and water for ꢀ
or 3 minutes.
4) Check for a resistance between thermistor leads. Normal reading is from 5 to 6.5kΩ
for the cabinet and defrost thermistors and 145 to 175kΩ for the clogged filter sensor.
Replace the thermistor if it exceeds the normal reading.
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IV. Removal and Replacement of Components
IMPORTANT
1. Ensure all components, fasteners, and thumbscrews are securely in place
after the equipment is serviced.
ꢀ. The Polyol Ester (POE) oils used in all units can absorb moisture quickly.
Therefore it is important to prevent moisture from entering the system when
replacing or servicing parts.
3. 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.
4. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts.
A. Service for Refrigerant Lines
WARNING
Use an electronic leak detector or soap bubbles to check for leaks. Add a trace
of refrigerant to the system (if using an electronic leak detector), and then raise
the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A or R-134a
as a mixture with pressurized air for leak testing.
1. Refrigerant Recovery
The undercounter unit is provided with a refrigerant access valve. Using proper
refrigerant practices, recover the refrigerant from the access valve and store it in an
approved container. Do not discharge the refrigerant into the atmosphere.
2. Brazing
WARNING
1. R-404A and R-134a are not flammable at atmospheric pressure and
temperatures up to 176°F (80°C).
ꢀ. R-404A and R-134a themselves are not explosive or poisonous. However,
when exposed to high temperatures (open flames), these refrigerants 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. Use an electronic leak detector or soap bubbles to check for leaks. Add a
trace of refrigerant to the system (if using an electronic leak detector), and
then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A
or R-134a as a mixture with pressurized air for leak testing.
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1) 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. Install the
new drier with the arrow on the drier in the direction of the refrigerant flow.
ꢀ) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG
Note: Because the pipes in the evaporator case are specially coated to resist corrosion,
it is important to make connections outside the evaporator case when possible. If
it is necessary to braze inside the evaporator case, use sandpaper to remove the
coating from the brazing connections before unbrazing the components.
3) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A or R-134a as a mixture
with pressurized air for leak testing.
3. Evacuation and Recharge
1) Attach a vacuum pump to the system using the low-side access valve.
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.
ꢀ) Turn on the vacuum pump. Open the low-side service manifold valve. Never allow the
oil in the vacuum pump to flow backwards.
3) Allow the vacuum pump to pull down to a ꢀ9.9" Hg vacuum. Evacuating period depends
on pump capacity.
4) Close the low-side service manifold valve.
5) Turn off the vacuum pump. Disconnect the vacuum pump hose and attach it to a
refrigerant service cylinder. 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 (latest edition) be used.
6) A liquid charge is required for charging an R-404A system and optional for charging an
R-134a system. Invert the service cylinder and place it on scales. Open the low-side
service manifold valve.
IMPORTANT
In order to prevent compressor damage, use caution in charging large
quantities of liquid into the low side.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) Close the refrigerant service cylinder access valve and disconnect the hose. Close the
service manifold valve and disconnect the low-side hose.
9) Cap the access valve to prevent a possible leak.
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B. Removal and Replacement of Refrigeration Unit
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration unit. Support the evaporator as it clears the
evaporator case.
5) Replace the removed parts in the reverse order of which they were removed.
6) Replace the front panel and all other guards in their correct positions.
7) Plug in the unit, and turn on the power supply.
CAUTION
1. To avoid a gas leak, be sure to prevent the refrigeration piping from coming
into contact with the body when taking out and returning the refrigeration unit
to its original position.
ꢀ. Do not let the fan motor or high pressure pipe touch wires.
Refrigeration Unit
Front Panel
C. 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 a new
start capacitor, overload and start relay. 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 the same type of refrigerant,
except when they use the same lubricant.
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1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears the
evaporator case.
5) Recover the refrigerant and store it in an approved container.
6) Remove the terminal cover on the compressor and disconnect the compressor wiring.
7) Remove the discharge, process, and suction pipes.
8) Remove the hold-down bolts, washers, rubber grommets, and sleeves.
9) Remove the compressor. Unpack the new compressor. Attach the rubber grommets
and sleeves of the prior compressor.
10) Place the new compressor in position, and secure it using the bolts and washers.
11) Remove the drier, then place the new drier in position.
1ꢀ) Remove the plugs from the suction, discharge and process pipes.
13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
14) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A or R-134a as a mixture
with pressurized air for leak testing.
15) Evacuate the system, and charge it with refrigerant; see the nameplate for the required
refrigerant charge.
16) Connect the terminals, then replace the terminal cover in its correct position.
17) Return the refrigeration unit to its proper position in the reverse order of the removal
procedure.
18) Plug in the unit, and turn on the power supply.
D. 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 repair or replacement has been
made. Install the new drier with the arrow on the drier in the direction of the
refrigerant flow.
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
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4) Very carefully slide out the refrigeration system. Support the evaporator as it clears the
evaporator case.
5) Recover the refrigerant and store it in an approved container.
6) Remove the four 4×8 Tꢀ screws holding the evaporator to the evaporator bracket and
provide a safe means for supporting the evaporator away from the ABS liner of the
evaporator case cover.
7) Remove the thermistors and thermal fuse. Protect any wiring from damage due to the
brazing torch.
8) Remove the insulation tubing, and disconnect the evaporator inlet and outlet tubing.
CAUTION
Be careful when handling the evaporator shroud assembly. This assembly
includes a defrost heater sheathed in a glass tube. This sheathing can be
easily damaged and may also cause cuts if broken. Heater will also be hot after
a defrost. Use gloves when handling and avoid touching the glass directly. Also
prevent heaters from touching other parts.
9) Remove the six 4×8 Tꢀ screws attaching the shrouds to the evaporator unit and remove
the shrouds. Remove the defrost thermistor if necessary to remove the shrouds.
10) Remove the evaporator and drier.
11) Place the new evaporator and new drier in position.
1ꢀ) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
CAUTION
1. Care must be taken to ensure that the capillary tube is not blocked or
contaminated during this process.
ꢀ. Ensure that the capillary tube extends inside the mating tubing 1 to 1 3/8"
(ꢀ5 to 35 mm).
13) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A or R-134a as a mixture
with pressurized air for leak testing.
14) Evacuate the system, and charge it with refrigerant. See the nameplate for the required
refrigerant charge.
15) Replace the removed parts in the reverse order of which they were removed.
16) Replace the front panel and all other guards in their correct positions.
17) Plug in the unit, and turn on the power supply.
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E. Removal and Replacement of Capillary Tube / Suction Line Assembly
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. Install the new drier with the arrow on the drier in the direction of the
refrigerant flow.
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears the
evaporator case.
5) Recover the refrigerant and store it in an approved container.
6) Remove the insulation on the suction line.
7) Remove the four 4×8 Tꢀ screws holding the evaporator to the evaporator bracket and
provide a safe means for supporting the evaporator away from the ABS liner of the
evaporator case cover. Protect any wiring from damage due to the brazing torch.
8) Remove the capillary tube / suction line assembly and drier.
9) Place the new capillary tube / suction line assembly and new drier in position.
10) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 psig.
CAUTION
1. Care must be taken to ensure that the capillary tube is not blocked or
contaminated during this process.
ꢀ. Ensure that the capillary tube extends inside the mating tubing 1 to 1 3/8"
(ꢀ5 to 35 mm).
11) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A or R-134a as a mixture
with pressurized air for leak testing.
1ꢀ) Insulate the entire suction line between the compressor and evaporator case.
13) Evacuate the system, and charge it with refrigerant; see the nameplate for the required
refrigerant charge.
14) Return the refrigeration unit to its proper position in the reverse order of the removal
procedure.
15) Plug in the unit, and turn on the power supply.
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F. Removal and Replacement of Thermistors
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears
the evaporator case. For the remainder of the procedure, see the appropriate section
below.
Cabinet Thermistor
5) Cut the cable tie holding the cabinet thermistor to the bracket attached to the fan motor
side of the evaporator shroud. Remove the thermistor.
6) Remove the thermistor wire connection (below the control box).
7) Install the new thermistor and return the refrigeration unit to its proper position in the
reverse order of the removal procedure.
8) Plug in the unit, and turn on the power supply.
Defrost Thermistor
5) The defrost thermistor element is secured to the top of the evaporator with aluminum
tape, and the wire is secured with a cable tie. Remove each with care.
6) Remove the thermistor wire connection (below the control box).
7) Install the new thermistor and return the refrigeration unit to its proper position in the
reverse order of the removal procedure.
8) Plug in the unit, and turn on the power supply.
Clogged Filter Thermistor (sensor)
5) The thermistor element is secured to the condenser outlet pipe with aluminum tape,
and the wire is secured with a cable tie. Remove each with care.
6) Remove the thermistor wire connection (below the control box).
7) Install the new thermistor and return the refrigeration unit to its proper position in the
reverse order of the removal procedure.
8) Plug in the unit, and turn on the power supply.
5ꢀ
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G. Removal and Replacement of Door Gasket
Remove old gasket by pulling it directly out of the vinyl gasket retainer. Thoroughly clean
the gasket area with mild soap and water prior to installing the new gasket. The new
gasket should be installed by assembling it at the corners first, then working toward the
center at the top, bottom and sides. The arrow-shaped portion of the gasket should be
firmly seated in the retainer groove for proper assembly. This can be checked by lifting
the edge of the gasket and observing the engagement.
CAUTION
In order to get a proper gasket fit, it is important not to stretch gasket material
during assembly.
H. Removal and Replacement of Defrost Heater
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears the
evaporator case.
5) Remove the connection lead wire for the defrost heater.
6) Remove the two 4×8 Tꢀ evaporator shroud screws above each end of the defrost
heater.
7) Carefully remove the defrost heater by twisting the ends together and removing the
ends from the slots in the shroud.
8) Return the refrigeration unit to its proper position in the reverse order of the removal
procedure.
9) Plug in the unit, and turn on the power supply.
CAUTION
Be careful when handling both the old and new defrost heaters. The heaters
are sheathed in glass tubes and can possibly cause cuts if broken. Heater will
also be hot after a defrost. Use gloves when handling. Avoid touching the glass
directly; hold the heaters by the ends.
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I. Removal and Replacement of Control Board
IMPORTANT
When receiving a service call, please ask the customer to turn the power off,
then turn it back on and monitor the condition for awhile. Even if the control
board malfunctions for some reason, it may resume normal operation after the
power is turned off once.
CAUTION
1. Fragile, handle very carefully.
ꢀ. The control board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the 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 attempt to repair the board in the field. Always replace the whole
board assembly if it goes bad.
5. Do not short out power supply to test for voltage.
6. Keep the thermistor leads, clogged filter sensor leads, and pressure switch
leads at least 1.5" away from high voltage leads (AC 100 volts or more) to
protect against electrical noise.
1) Turn off power and unplug the unit.
ꢀ) Remove the front panel.
3) Remove the wire guard, then remove all wiring connections at the bottom of the control
box.
4) Remove the control box by loosening the 4×8 Tꢀ screw securing the bottom control box
bracket to the evaporator case cover.
5) Remove the three 4×8 Tꢀ screws from the control box top and bottom, then carefully
remove the control box cover.
6) Unhook all wiring connections to the control board.
7) Remove the control board by carefully removing the four 4×8 Tꢀ attachment screws.
8) Identify the part number and software revision of the new board and make sure it is
interchangeable with the old board.
9) Install the new board in the control box taking care not to damage it.
10) Hook all wiring connections back to the control board.
11) Check to make sure that the switches and buttons line up appropriately on the display
panel and that they operate.
1ꢀ) Replace all panels and guards.
13) Plug in the unit and turn on the power supply.
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J. Removal and Replacement of Fan Motors
1) Turn off the power supply, and unplug the unit.
ꢀ) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears
the evaporator case. For the remainder of the procedure, see the appropriate section
below.
Condenser Fan Motor
5) Disconnect the lead wire to the condenser fan motor.
6) Remove the two 5×10 condenser fan motor bracket attachment bolts and remove the
condenser fan motor assembly.
7) Remove the fan motor from the attachment base and remove the fan blade from the fan
motor.
8) Install the new fan motor and return the refrigeration unit to its proper position in the
reverse order of the removal procedure.
9) Plug in the unit, and turn on the power supply.
Evaporator Fan Motor
5) Disconnect the lead wire to the evaporator fan motor.
CAUTION
Be careful when handling the evaporator shroud assembly. This assembly
includes a defrost heater sheathed in a glass tube. This sheathing can be
easily damaged and may also cause cuts if broken. Heater will also be hot after
a defrost. Use gloves when handling and avoid touching the glass directly. Also
prevent heaters from touching other parts.
6) Remove the eight 4×8 Tꢀ screws attaching the shroud to the evaporator unit and
remove the shroud. Remove the defrost thermistor if necessary to remove the shroud.
7) Remove the four 4×1ꢀ Tꢀ evaporator fan motor attachment screws and remove the
evaporator fan motor.
8) Install the new fan motor and return the refrigeration unit to its proper position in the
reverse order of the removal procedure.
9) Plug in the unit, and turn on the power supply.
K. Door Re-Hinging and Drawer Conversion
Contact your local Hoshizaki distributor or Hoshizaki Technical Support
(1-800-ꢀ33-1940) if door reversing or drawer conversion is desired.
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V. Cleaning and Maintenance Instructions
WARNING
1. Do not splash water directly onto the unit. This might cause short circuit,
electric shock, corrosion or failure.
ꢀ. When cleaning or inspecting the unit, turn off the power switch and unplug
the unit or disconnect the main power source to prevent electric shock, by
unexpected entrance of water into the unit, or injury by any moving parts.
3. To prevent frostbite, do not touch foods or containers (especially metallic) in
the freezer compartment with damp hands.
4. Before using a sanitizer such as inert soap and sodium hypochlorite,
thoroughly read the manufacturer’s instructions on the proper usage and
amount.
IMPORTANT
1. To prevent damage to the painted or plastic surfaces, do not use the
following: thinner, benzine, alcohol, petroleum, soap powder, polishing
powder, alkaline cleaner, acid, scouring pad and especially those strong
cleaners for use on a ventilating fan or a cooking range. Also, to prevent
corrosion, do not use a chlorine bleach such as sodium hypochlorite on the
stainless steel surfaces.
ꢀ. Use clean cloth and hands for cleaning.
3. Before cleaning the cabinet interior, move the stored foods into another
clean refrigerator/freezer.
A. Cleaning
1. Stainless Steel Exterior
Wipe the exterior occasionally with a clean, soft cloth. Use a damp cloth containing a
neutral cleaner to wipe off oil or dirt build up.
2. Stainless Steel Interior
Spills should be wiped up promptly to avoid unpleasant odors. The cabinet interior
should be cleaned periodically with a mild soap or detergent.
3. Gaskets
Gaskets should be cleaned regularly with mild soap and water to remove dirt and
grease.
4. Condenser
Check the condenser once a year and use a brush or vacuum cleaner to clean the unit
as required.
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5. Air Filter
As the air filter becomes clogged with dirt or dust, the unit’s performance will be reduced.
Do not operate the unit with the air filter removed. This will accelerate clogging of the
condenser and result in failure. Check the filter at least twice each month. If it is dirty,
use warm water and a neutral cleaner to wash the filter. To avoid damaging the air filter,
do not use water hotter than 104°F (40°C). The filter is located behind the front panel.
This filter can be removed by opening the front panel and lifting the filter away from the
condenser. Reinstall the filter after cleaning.
6. Shelves
Remove and clean regularly.
7. Drawers
On units with drawers, the drawers can be removed for cleaning either individually or as
an entire assembly.
• To remove an individual drawer, first remove all food product from the drawer. Pull the
drawer out to its fully extended position and lift up on the handle to disengage the drawer.
Before removing the drawer, carefully support the rear and front of the drawer and then
slowly remove it from the cabinet.
• To remove the drawer frame assembly, first remove the drawers and then remove the
fasteners in the thermal break and in the rear of the cabinet. Carefully slide the frame
out of the cabinet, making sure not to damage the thermal break. Reinstall in the reverse
order, making sure not to overtighten the screws in the thermal break.
• To remove the drawer slide (center slide containing rollers) for cleaning, rotate the top
of the slide away from the frame while the slide is completely inside the cabinet. Drawer
slides do not require lubrication, but slides should be kept clean and free of food.
Note: Drawer slides are dishwasher safe.
B. Maintenance
1. Air Filter
The air filter promotes clean condenser surfaces and efficient unit operation by removing
dirt and grease from circulating air. The filter should be checked monthly and cleaned
when necessary—as described in "A.5. Air Filter".
All other maintenance or service on this unit should be performed in accordance with the
Hoshizaki Service Manual by a qualified service technician.
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VI. Wiring Diagrams
A1. HUR40A, HWR40A (auxiliary code Q5 and earlier)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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A2. HUR40A(-D), HWR40A(-D) (auxiliary code Q6 and later)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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B. HUF40A(-D), HWF40A(-D)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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C1. HUR68A, HWR68A (auxiliary code Q5 and earlier)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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C2. HUR68A(-D), HWR68A(-D) (auxiliary code Q6 and later)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
6ꢀ
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D. HUF68A(-D), HWF68A(-D)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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E. HUR96A(-D), HWR96A(-D)
115/60/1
Transformer Output
10V at 115V
Note: Jumper (color: white) between pins 7 and 8 of connector K151 may not be
present on all units, but this will not adversely affect performance.
CAUTION
Before diagnosing and/or servicing the unit, confirm that you have the proper
wiring diagram by checking against the diagram located inside the front panel.
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