Hoshizaki SSE Series User manual

Hoshizaki
“A Superior Degree
of Reliability”
www.hoshizaki.com
Model
SSE
Professional Series
Refrigerated Kitchen Equipment
Hoshizaki America, Inc.
Number: 73177
Issued: 4-14-2010
Revised: 9-17-2015
SERVICE MANUAL

2
IMPORTANT
Only qualied service technicians should install, service, and maintain the
unit. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual. Failure to service and maintain
the equipment in accordance with this manual may adversely affect safety,
performance, component life, and warranty coverage.
Hoshizaki provides this manual primarily to assist qualied service technicians in the
service and maintenance of the unit.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, write, or send an e-mail message to the Hoshizaki Technical
Support Department for assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Phone: [phone] Technical Support
[phone]
Fax: [phone]
[phone]
E-mail: [email protected]
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number __________________________
• Serial Number __________________________
• Complete and detailed explanation of the problem.

3
CONTENTS
Important Safety Information ................................................................................................. 5
I. General Information ............................................................................................................ 6
A. Construction.................................................................................................................. 6
1. One Section ............................................................................................................. 6
2. Two Section ............................................................................................................. 7
3. Three Section .......................................................................................................... 8
B. Sequence of Operation ................................................................................................. 9
1. Sequence Cycles and Shutdown ............................................................................. 9
a) Startup .............................................................................................................. 9
b) Cool Down ......................................................................................................... 9
c) Cool Down Achieved ......................................................................................... 9
d) Cool Down Restart ............................................................................................ 9
e) Defrost ............................................................................................................... 9
2. Sequence Flow Chart............................................................................................ 10
C. Display Board...............................................................................................................11
D. Control Board .............................................................................................................. 12
1. Control Board Layout ............................................................................................. 13
2. Features................................................................................................................. 14
a) LED Display ..................................................................................................... 14
b) Guarded Access Menu..................................................................................... 14
c) Service Menu................................................................................................... 14
d) Alarm Signals................................................................................................... 14
e) Defrost ............................................................................................................. 14
f) Default Safety Program ..................................................................................... 14
g) High Voltage and Low Voltage Cut-outs........................................................... 14
3. LED Lights and Alarm Safeties Chart.................................................................... 15
4. Controls and Adjustments...................................................................................... 17
a) Default Dip Switch Settings.............................................................................. 17
b) Unit Operation (Freezer/Refrigerator) (S3 dip switch 1)................................... 17
c) Cabinet Light/Heated Glass Door (S3 dip switch 2)......................................... 18
d) Door Switch Type (S3 dip switch 3).................................................................. 18
e) Reach-In/Pass Thru Defrost Initiation Temperature (S3 dip switch 4) .............. 18
f) Display Board Operation (S3 dip switch 5) ....................................................... 18
g) Dual Temp Unit (S3 dip switch 6) ..................................................................... 19
h) Freezer Evaporator Fan Operation (except RFH1) (S3 dip switch 7)............... 19
i) RFH1 Condensate Pan Heater Operation (S3 dip switch 8) ............................. 19
IMPORTANT
This manual should be read carefully before the unit is serviced or maintenance
operations are performed. Only qualied service technicians should install,
service, and maintain the unit. Read the warnings contained in this booklet
carefully as they give important information regarding safety. Please retain this
booklet for any further reference that may be necessary.

4
5. Guarded Access Menu .......................................................................................... 20
a) Temperature Setpoint....................................................................................... 20
b) Defrost Frequency............................................................................................ 20
c) Temperature Display Scale (°F or °C) .............................................................. 21
6. Service Menu ........................................................................................................ 22
E. Compressor Thermal Overload and Short Cycle Protection........................................ 23
F. Perimeter Heater.......................................................................................................... 23
G. Thermistors................................................................................................................. 23
III. Technical Data ................................................................................................................ 24
A. Wiring Diagrams.......................................................................................................... 24
1. RH_-SSE-XX (FG, HG, FS, or HS) Models ........................................................... 24
2. PTR_SSE-XXXX (FSFS, HSHS, FGFG, HGHG, HGHS) Models ......................... 25
IV. Service Diagnosis ........................................................................................................... 26
A. Diagnostic Procedure .................................................................................................. 26
B. Control Board Check ................................................................................................... 29
C. Thermistor Check........................................................................................................ 30
D. Diagnostic Chart ......................................................................................................... 31
1. Unit Not Cooling..................................................................................................... 31
2. Evaporator is Frozen Up ........................................................................................ 33
3. Defrost Fails to Terminate ...................................................................................... 33
4. Other...................................................................................................................... 33
V. Removal and Replacement of Components .................................................................... 34
A. Service for Refrigerant Lines....................................................................................... 34
1. Refrigerant Recovery ............................................................................................. 34
2. Brazing .................................................................................................................. 35
3. Evacuation and Recharge (R-134a) ...................................................................... 35
B. Removal and Replacement of Compressor................................................................. 36
C. Removal and Replacement of Compressor Electronic Unit ........................................ 37
D. Removal and Replacement of Expansion Valve.......................................................... 38
E. Removal and Replacement of Evaporator................................................................... 39
F. Removal and Replacement of Evaporator Fan Motor .................................................. 40
G. Removal and Replacement of Door Gasket ............................................................... 40
H. Removal and Replacement of Door Closure Spring ................................................... 41
I. Door Re-Hinging........................................................................................................... 42
J. Removal and Replacement of Control Board............................................................... 42
K. Removal and Replacement of Thermistors ................................................................. 43
VI. Cleaning Instructions...................................................................................................... 44

5
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, or damage to the unit.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
CAUTION Indicates a situation which could result in damage to the unit.
IMPORTANT Indicates important information about the use and care of the
unit.
WARNING
This unit should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore
dangerous. The manufacturer cannot be held responsible for eventual damage
caused by improper, incorrect, and unreasonable use.
To reduce the risk of death, electric shock, serious injury, or re, follow
basic precautions including the following:
• This unit requires an independent power supply. See the nameplate for proper
voltage and breaker/fuse size. Failure to use a proper breaker or fuse can
result in a tripped breaker, blown fuse, or damage to existing wiring. This
could lead to heat generation or re.
• THIS UNIT MUST BE GROUNDED: This unit is equipped with a 3-prong
grounding plug to reduce the risk of potential shock hazards. It must be
plugged into a properly grounded, independent 3-prong wall outlet. If the
outlet is a 2-prong outlet, it is your personal responsibility to have a qualied
electrician replace it with a properly grounded, independent 3-prong wall
outlet. Do not remove the ground prong from the power cord and do not use
an adapter plug.
• Do not use an extension cord.
• Make sure the control switch is in the "OFF" position before plugging in or
unplugging the unit to reduce the risk of electric shock.
• Do not use a unit with a damaged power cord. The power cord should not be
altered, jerked, bundled, weighed down, pinched, or tangled. Such actions
could result in electric shock or re. To unplug the unit, be sure to pull the
plug, not the cord, and do not jerk the cord.
• To reduce the risk of electric shock, do not touch the plug or control switch
with damp hands.
• This unit should be disassembled or repaired only by qualied service
personnel to reduce the risk of electric shock, injury, or re.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, re, or damage to the unit.

6
I. General Information
A. Construction
1. One Section
Evaporator
Fan Motor
Evaporator
Control Board
Condenser Fan Motor
Condenser
Condenser Air Filter
Display Board
Top Cover
Front Panel
Door
Door Lock
Door Gasket
Control Box
Power Switch
Perimeter Heater
Switch
Door Latch
Cabinet Thermistor
Defrost Thermistor
Evaporator Case Cover
Models
RH1-SSE-FG, RH1-SSE-HG
RH1-SSE-FS, RH1-SSE-HS
Control Box Cover
Model Shown: RH1-SSE-FG
Light Switch
(glass door model)
Door Switch
Compressor and
Compressor Electronic Unit

7
2. Two Section
Models
RH2-SSE-FG, RH2-SSE-HG
RH2-SSE-FS, RH2-SSE-HS
Evaporator Fan Motor
Evaporator
Control Board
Condenser Fan Motor
Condenser
Condenser Air Filter
Display Board
Top Cover
Front Panel
Door Lock
Door Gasket
Control Box
Power Switch
Perimeter Heater
Switch
Cabinet Thermistor
Defrost Thermistor
Evaporator
Case Cover
Model Shown: RH2-SSE-HS
Control Box Cover
Door Latch
Door
Light Switch
(glass door model)
Door Switch
Compressor and
Compressor Electronic Unit

8
3. Three Section
Models
RH3-SSE-FG, RH3-SSE-HG
RH3-SSE-FS, RH3-SSE-HS
Compressor and Compressor Electronic Unit
Evaporator Fan Motor
Evaporator
Control Board
Condenser Fan Motor
Condenser
Condenser Air Filter
Display Board
Top Cover
Front Panel
Door
Door Lock
Door Gasket
Control Box
Power Switch Perimeter Heater Switch
Cabinet Thermistor
Defrost Thermistor
Evaporator Case Cover
Model Shown: RH3-SSE-FS
Control Box Cover
Door Latch Door Switch
Light Switch
(glass door model)

9
B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below.This unit utilizes a control board to
switch the components on and off as needed. When power is supplied and the power
switch is in the "ON" position, CB red "POWER OK" LED comes on and CB revision
(r###) appears on DB.
Note: 1. "POWER OK" LED remains on until the power switch is moved to the "OFF"
position, the power supply is turned off, or the unit is unplugged from the
electrical outlet.
2. There is a minimum 2.5-minute Comp on time and 2.5-minute Comp off time.
a) Startup
No Component LED on: EvapFM energizes. 2.5-minute Comp delay timer starts.
Cabinet temperature appears on DB.
b) Cool Down
LEDs 4 and 5 on: 2.5-minute Comp delay timer terminates, EvapFM continues,
Comp, ConFM, and PH energize.
c) Cool Down Achieved
No Component LED on: CB monitors cooling of the cabinet via CTh. CTh cools to
3°F (1.7°C) below setpoint. EvapFM continues, Comp, ConFM, and PH de-energize.
d) Cool Down Restart
LEDs 4 and 5 on: CTh warms to 3°F (1.7°C) above setpoint. EvapFM continues,
Comp, ConFM, and PH energize.
e) Defrost
LED 5 on:
(1a) Temperature-Initiated Defrost
DTh cools to 13°F (-10°C). Comp and PH, if energized, de-energize, EvapFM
continues. If energized, ConFM continues, otherwise, ConFM energizes. Cabinet
temperature is displayed on DB during defrost.
(1b) Optional Time-Initiated Defrost
The optional time-initiated defrost is factory set to 0 times per day. Before
changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for
recommendations.
When set to greater than 0, defrost initiates when the defrost timer terminates. For
further details, see "II.D.5.b) Defrost Frequency."
(2) Defrost Termination
DTh warms to 40°F (4.4°C). EvapFM and ConFM continue. 2.5 minute delay
before Comp and PH energize.
Legend: CB–control board; ConFM–condenser fan motor; Comp–compressor;
CTh–cabinet thermistor; DB–display board; DTh–defrost thermistor;
EvapFM–evaporator fan motor; PH–perimeter heater

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2. Sequence Flow Chart
Legend: EvapFM-cabinet fan motor CTh-cabinet thermistor Comp-compressor ConFM-condenser fan motor DTh-defrost thermistor PH-perimeter heater
Refrigerator Sequence Flow Chart
1. Startup 2. Cool Down 3. Cool Down Achieved
EvapFM continues Comp energized ConFM energized PH energized
CTh in control
EvapFM energized
2.5-minute Comp delay timer starts
EvapFM continues Comp de-energized ConFM de-energized PH de-energized
CTh cools to 3°F (1.7°C) below setpoint
CTh warms to 3°F (1.7°C) above setpoint
4. Defrost
DTh cools to 13°F (-10°C) or optional defrost timer terminates
EvapFM continues ConFM continues Comp de-energized PH de-energized
5. Defrost Termination
EvapFM continues ConFM continues
DTh warms to 40°F (4.4°C)
Note: Minimum 2.5-minute Comp on time and 2.5-minute Comp off time.
DTh in control

11
C. Display Board
When the power switch is moved to the "ON" position, the control board revision
appears on the display board. "r###" indicates the control board revision level (e.g.,
r23C). Afterward, the current cabinet temperature is displayed. The display board also
allows for access to the guarded access menu and service menu. From the guarded
access menu, the cabinet setpoint, defrost frequency, and temperature display scale can
be adjusted. For further details, see "II.D.5. Guarded Access Menu." From the service
menu, information regarding unit functions can be obtained. For further details, see
"II.D.6. Service Menu."
Ribbon Cable Connector
LED Display Up and Down Buttons
"ENTER" Button
"RESET" Button
P/N 2A0883-01
Fig. 2
Display Board
Front Panel
Display Board
Door
Up and Down
Buttons
Display
Board
Fig. 1
"RESET" Button:
Temporarily
silences audible
alarms

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D. Control Board
• A Hoshizaki exclusive control board is employed in all Hoshizaki Professional Series
Reach-Ins.
• All models are pretested and factory set.
CAUTION
1. The control board is fragile, handle very carefully.
2. 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 before handling or replacing the control board.
3. Do not touch the electronic devices on the control board or the back of the
control board.
4. Do not change wiring and connections. Never misconnect terminals.
5. Always replace the whole control board assembly if it goes bad.
6. Do not short out power supply to test for voltage.
7. Keep the thermistor leads, clogged lter thermostat leads, door switch leads,
pressure switch leads, and ribbon cable at least 1-1/2" away from high
voltage leads (100VAC or more) to protect against electrical noise.

13
1. Control Board Layout
"R-A" Control Board
Relay LED Component Energized
LED
ON/OFF
X1 1 Defrost Heater (Freezer) ON X2 2 Cabinet Light ON X3 3 Evaporator Fan Motor OFF X4 4 Compressor Relay ON X5 5 Condenser Fan Motor
Condensate Pan Heater (RFH1)
ON
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• K9 Connector (115VAC) #3 Condenser Fan Motor (black) #2 Condenser Fan Motor (brown)
• K1 Connector (115VAC) #1 Power Switch Input (black) #2 Open #3 Evaporator Fan Motor (dark blue) #4 Open #5 Cabinet Light (light blue) #6 Open #7 Open #8 Open #9 Power Switch Input (black) #10 Compressor Relay (gray)
• K5 Connector (5VDC) Open
• K4 Connector (5VDC) Cabinet Thermistor (gray (GY))
• K3 Connector (5VDC) Defrost Thermistor (orange (O))
• S1 "ALARM RESET" Button
• S2 "OUTPUT TEST" Button
• K2 Connector (10VAC)
• K7 Connector Display Cable
S3 Dip Switch
X3X2
X1
X4
X5
• LED 5 (X5 Relay) Condenser Fan Motor Condensate Pan Heater (RFH1)
• LED 4 (X4 Relay) Compressor Relay
• LED 1 (X1 Relay) Defrost Heater (Freezer)
• LED 2 (X2 Relay) Cabinet Light
•LED 3 (X3 Relay) Evaporator Fan Motor (Off when Evaporator Fan Relay Energizes)
• K6 Connector (5VDC) #1 Open #2 and #3 Clogged Filter Thermostat (pink) (Normally Open) #4 and #5 Cabinet Light (light blue) (Normally Closed) #6 and #7 High Pressure Switch (violet) (Normally Closed)
#1 Transformer (red)
#2 Transformer (red)

14
2. Features
a) LED Display
The display board identies system details and diagnostic information. A ribbon cable
connects the display board to the control board for system communication. Be sure to
keep the ribbon cable at least 1-1/2" away from high voltage leads (100VAC or more)
to protect against electrical noise.
b) Guarded Access Menu
Three settings can be viewed and changed from the guarded access menu:
Temperature Setpoint, Defrost Frequency, and Temperature Display Scale (°F or °C).
For details, see "II.D.5. Guarded Access Menu."
c) Service Menu
The service menu allows for the viewing and setting of system operating details and
parameters. For details, see "II.D.6. Service Menu."
d) Alarm Signals
Alarm signals are designed to protect the unit and food product. These alarms give
information or warnings in the event the unit is operating out of acceptable parameters.
For details, see "II.D.3. LED Lights and Alarm Safeties Chart."
e) Defrost
Main defrost control: Temperature-initiated, temperature-terminated defrost. Optional
defrost control: Time-initiated, temperature-terminated defrost.
For details, see "II.D.5.b) Defrost Frequency."
f) Default Safety Program
Cabinet Thermistor: In the event the cabinet thermistor reading is out of range, the
compressor operates on a xed time basis of 5-minutes on and 5-minutes off.
Defrost Thermistor: In the event the defrost (evaporator) thermistor reading is out
of range, defrost initiation occurs every 6 hours and terminates at 40°F cabinet
thermistor temperature.
Cabinet and Defrost Thermistor: In the event both thermistor readings are out of
range, the compressor operates on a xed time basis of 5-minutes on and 5-minutes
off and a defrost cycle initiates every 6 hours and terminates after 45 minutes. For
further details, see "IV.C. Thermistor Check."
g) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this unit are limited by the
high and low voltage cut-outs.
If high voltage (140VAC±5% or more) is present, the unit automatically stops and the
control board signals with "E6" display and 8-beep alarm every 3 seconds.
If low voltage (92VAC±5% or less) is present, the unit automatically stops and the
control board signals with "E7" display and 9-beep alarm every 3 seconds.
When the proper supply voltage is resumed, the unit automatically starts running
again.

15
3. LED Lights and Alarm Safeties Chart
With proper power supply, the "POWER OK" LED energizes and remains on. LEDs
1 through 5 energize as the unit cycles through the sequence of operation. If an error
occurs, the alarm code and cabinet temperature are displayed in 2-second intervals and
an alarm sounds. To temporarily reset alarm, press the display board "RESET" button. To
reset and clear the control board memory of an alarm, press the control board "ALARM
RESET" button. See the table below for a description of alarms and reset options.
Sequence Steps LEDs Energized Components Notes
Start - EvapFM LED 3 off when EvapFM energized.
Cool Down 4 and 5 EvapFM, Comp, and ConFM At startup 2.5 minute Comp delay.
Cool Down Achieved - EvapFM 2.5 minute minimum off time.
Defrost 5 EvapFM, ConFM -
Door Open 2 Cabinet Light (solid door) -
Alarm Signals
Alarm
Code
No. of Beeps
(every 10 sec.) Problem Reset Options
E1 3
High Temperature Alarm
Cabinet temperature has remained above
setpoint by 10°F (5.6°C) for more than 2 hours.
Press the display board "RESET"
button. If temperature has returned to
setpoint range, alarm stops and "E1"
clears.
If temperature is not back in range,
pressing the display board "RESET"
button temporarily silences the alarm
for 5 minutes. "E1" continues to ash.
E2 4
Low Temperature Alarm
Cabinet temperature has remained below
setpoint by 8°F (4.4°C) for more than 1 hour.
Press the display board "RESET"
button. If temperature has returned to
setpoint range, alarm stops and "E2"
clears.
If the temperature is not back in range,
pressing the display board "RESET"
button temporarily silences the alarm
for 5 minutes. "E2" continues to ash.
E3 5 N/A [Freezer Only] Defrost longer than 1 hour. N/A
E4 6
High Pressure Alarm
Compressor discharge pressure is outside
normal operating range. Pressure switch has
been triggered 3 or more times in 1 hour.
If switch trips 5 times in 1 hour, compressor
stops and will not restart.
After 5 high pressure switch trips, the
alarm can be silenced for 1 hour by
pressing the display board "RESET"
button.
Service Tech: Reset by pressing the
control board "ALARM RESET" button.
E6 8
High Voltage (140VAC±5% or less) "POWER OK" LED turns off if voltage
protection operates. The voltage
safeties automatically reset when
voltage is corrected.
Press the display board "RESET"
button to temporarily silence the alarm
for 5 minutes.
E7 9
Low Voltage (90VAC±5% or less)
E8 Constant
Cabinet Thermistor
During alarm, unit operates in cabinet
thermistor fail mode.
Cabinet Thermistor Fail Mode: Unit on
5 minutes, off 5 minutes. This continues until
thermistor is replaced.
After replacing thermistor, alarm
resets.
During alarm, press the display board
"RESET" button to silence alarm for
5 minutes.

16
Alarm Signals (continued)
Alarm
Code
No. of Beeps
(every 10 sec.) Problem Reset Options
E9 Constant
Defrost Thermistor
During alarm, unit operates in the defrost
thermistor fail mode.
Defrost Thermistor Fail Mode: Defrost occurs
once every 6 hours and terminates after
45minutes.
After replacing thermistor, alarm
resets.
During alarm, press the display board
"RESET" button to silence alarm for
5 minutes.
E10 10 N/A [Dual Temp Models Only] Communication
error between control boards.
N/A
CF 1
Clogged Filter Alarm (condenser thermostat)
Condenser lter needs cleaning.
WARNING: If this alarm occurs frequently,
discharge temperature is consistently too
high. Failure to take action could result in
damage to the compressor.
Clean lter. Allow time for thermostat
to react, then press the display board
"RESET" button.
During alarm, press the display board
"RESET" button to silence alarm for
2hours.
door 2 Door open: Display alternates between cabinet
temperature and "door."
Door open longer than 3 minutes: alternating
display continues and alarm sounds.
Close door. During alarm, press
the display board "RESET" button
to temporarily silence alarm for
3minutes.
Note: Setting service menu item #3 to "ON" resets all alarms regardless of whether
or not the problems are resolved. This is a complete clearing of all alarms. See
"II.D.6. Service Menu" for details.

17
4. Controls and Adjustments
CAUTION
Dip switches are factory set. Failure to maintain factory settings may adversely
affect performance and warranty coverage. For more information, contact
Hoshizaki Technical Support at 1-800-233-1940.
a) Default Dip Switch Settings
The S3 dip switch settings are factory-set to the following positions:
S3 Dip Switch
Dip Switch No. 1 2 3 4 5 6 7 8
All SSE Models ON OFF OFF OFF OFF OFF OFF OFF
S3 Dip Switch
Unit Operation (Freezer/Refrigerator) (1)
Display Board Operation (5)
Door Switch Type (Rocker/Plunger) (3)
Cabinet Light/Heated Glass Door (2)
Freezer Evaporator Fan
Operation (except RFH1) (7)
Reach-In/Pass Thru Defrost
Initiation Temperature (4)
Dual Temp Unit (6)
RFH1 Condensate Pan Heater Operation (8)
b) Unit Operation (Freezer/Refrigerator) (S3 dip switch 1)
This setting determines whether the control board operates in refrigerator mode or
freezer mode. It also determines the temperature setpoint range at which the unit
operates.
Factory set, no adjustment required.
S3 Dip Switch Setting Unit Operation Temperature Setpoint Range Factory Default
No. 1
OFF Freezer -10°F (-23°C) to 25°F (-3.9°C) -3°F (-19.4°C)
ON Refrigerator 36°F (2.2°C) to 50°F (10°C) 36°F (2.2°C)

18
c) Cabinet Light/Heated Glass Door (S3 dip switch 2)
When the cabinet light option is selected (S3 dip switch 2 "OFF"), the control board
energizes the K1 connector pin #5 light blue (LBU) wire and turns on the cabinet light
(solid door models) each time the door and door switch open.
When the heated glass door option is selected (S3 dip switch 2 "ON"), the control board
energizes the K1 connector pin #5 when the compressor is off, and de-energizes when
the compressor turns on. Professional Series SSE glass doors are not heated.
Factory set, no adjustment required. Do not adjust to "ON" position on SSE models.
S3 Dip Switch Setting Cabinet Light/Heated Glass Door
No. 2
OFF Cabinet Light (Solid Door)
ON Heated Glass Door (No Longer Applicable)
d) Door Switch Type (S3 dip switch 3)
Hoshizaki has utilized both normally open and normally closed door switch contact
styles. S3 dip switch 3 is used to select the type of switch used on a particular model.
Factory set, no adjustment required.
S3 Dip Switch Setting Door Switch Type (Rocker or Plunger)
No. 3
OFF Rocker Door Switch (square): Open Contacts when Doors are Open
ON Plunger Door Switch (round): Closed Contacts when Doors are Open
e) Reach-In/Pass Thru Defrost Initiation Temperature (S3 dip switch 4)
Refrigerators only. Pass Thru refrigerator models require a defrost initiation temperature
that is different from the reach-in refrigerator models.
Factory set, no adjustment required.
S3 Dip Switch Setting Model Defrost Initiation
Temperature
No. 4
OFF All Refrigerators Except Pass Thru 13°F (-10.5°C)
ON Pass Thru 8°F (-13.3°C)
f) Display Board Operation (S3 dip switch 5)
The display board may be disabled by moving S3 dip switch 5 to the "ON" position. When
the display board is disabled, the control board operates in default mode.
Default Mode: Compressor on 5-minutes then off 5-minutes. See "II.D.2.f) Default Safety
Program."
Factory set, no adjustment required.
S3 Dip Switch Setting Display Board Status
No. 5
OFF Enabled
ON Disabled

19
g) Dual Temp Unit (S3 dip switch 6)
Dual Temp units require S3 dip switch 6 be placed in the "ON" position for proper
operation. CAUTION! Do not adjust S3 dip switch 6 out of the factory default
position on this model. This dip switch must be left in the factory default position
or this unit will not operate correctly. Factory set, no adjustment required.
S3 Dip Switch Setting Dual Temp Selector Switch
No. 6
OFF All Models Except Dual Temp
ON Dual Temp Models
h) Freezer Evaporator Fan Operation (except RFH1) (S3 dip switch 7)
Active when S3 dip switch 1 and S3 dip switch 8 are in the "OFF" position (freezer
application). When S3 dip switch 7 is in the "ON" positon, evaporator fan operates
continuously (except during defrost) and the temperature at which the evaporator fan
resumes after defrost changes from 0°F (-17.7°C) to 70°F (21°C). When set to the
"OFF" position, the evaporator fan cycles on and off with the compressor. After defrost,
evaporator fan resumes when evaporator temperature reaches 0°F (-17.7°C).
Factory set, no adjustment required.
Note: S3 dip switch 7 is ignored when S3 dip switch 1 or S3 dip switch 8 is in the "ON"
position.
S3 Dip Switch Setting Freezer Evaporator Fan Operation
No. 7
OFF Evap. Fan Cycles On and Off with the Compressor
After Defrost, Evap. Fan Restarts when Defrost Thermistor Reaches 0°F (-17.7°C)
ON Continuous Evap. Fan (except during defrost)
After Defrost, Evap. Fan Restarts when Defrost Thermistor Reaches 70°F (21°C)
i) RFH1 Condensate Pan Heater Operation (S3 dip switch 8)
Active when S3dip switch 1 is in the "OFF" position (freezer application) and S3 dip
switch6is in the "ON" position (Dual Tempapplication). When S3 dip switch 8 is in the
"OFF" position, the condensate pan heater is not active and the evaporator fan cycles
according to S3 dip switch 7 setting. When S3 dip switch 8 is in the "ON" position, the
control board energizes the condensate pan heater through the control board X5relay
(on when compressor is off) and the evaporator fan runs continuously (except in defrost).
CAUTION! Do not adjust S3 dip switch 8 out of the factory default position on this
model. This dip switch must be left in the factory default position or this unit will
not operate correctly. Factory set, no adjustment required.
Note: S3 dip switch 8 is ignored when S3 dip switch 1 is in the "ON" position or S3dip
switch 6 is in the "OFF" position.
S3 Dip Switch Setting RFH1 Condensate Pan Heater Operation
No. 8
OFF X5 Relay Controls Condenser Fan Motor
Evap. Fan Defaults to S3 Dip Switch 7 Setting
ON
X5 Relay Controls Condensate Pan Heater
Continuous Evap. Fan (except during defrost)
After Defrost, Evap. Fan Restarts when Defrost Thermistor Reaches 0°F (-17.7°C)

20
5. Guarded Access Menu
Three settings can be viewed and adjusted from this menu: temperature setpoint, defrost
frequency, and temperature display scale. To enter the guarded access menu, press
and hold the up and down buttons simultaneously for 3 seconds. The current setpoint
temperature is displayed.
a) Temperature Setpoint
The temperature setpoint is the value for the average cabinet temperature. The
temperature differential for the compressor to turn on and off is ±3°F of the setpoint. For
example, setpoint = 36°F (2.2°C), compressor on at 39°F (3.9°C), compressor off at
33°F(0.6°C). If necessary, adjust the setpoint temperature as follows:
1) Press and hold the up and down buttons simultaneously for 3 seconds. The current
setpoint temperature is displayed.
2) To change the setpoint, press the up or down button until the desired value appears.
The cabinet temperature is adjustable between 36°F and 50°F (2.2°C and 10°C).
Factory default is 36°F (2.2°C).
3) Press the "ENTER" button to set the value and view the next setting. If no change in
value is desired, press the "ENTER" button repeatedly until you return to the normal
display. If you do not cycle through the menu and no button is pressed in 15 seconds,
the display returns to normal and the temperature setpoint remains unchanged.
b) Defrost Frequency
This unit uses an off-cycle defrost initiated by temperature or time. During defrost the
cabinet temperature is displayed and the condenser fan motor and evaporator fan motor
are energized.
• Defrost Initiation Temperature: 13°F (-10°C). (8°F (-13.3°C) for pass thru units).
• Defrost Termination Temperature: 40°F (4.4°C).
• Defrost Initiated Time: Adjustable between 0 and 12 defrosts per 24 hrs. The factory
default setting is 0. Before changing this setting, contact Hoshizaki Technical Support
at 1-800-233-1940 for recommendations. When changed, the defrost setting will take
effect after the next defrost based on the previous setting. If it is desired that this
change in interval timing take effect immediately, turn the unit off and back on. The next
time-initiated defrost initiates "x" hours after power is turned back on. For example, if
the setting is dF 6, x=4 the next defrost takes place 4 hours from the time that power is
turned back on.
• 1-Hour Defrost Backup Timer: When defrost is initiated (temperature or time), a 1-hour
back-up defrost timer starts. The 1-hour back-up defrost timer terminates the defrost
cycle in cases where the defrost thermistor fails to terminate the defrost cycle within
1hour.
If necessary, adjust the time-initiated defrost frequency as follows:
1) Press and hold the up and down buttons simultaneously for 3 seconds. Press the
"ENTER" button until "dF" is displayed.
2) To change the defrost frequency, press the up or down button until the desired value
appears. The defrost frequency is adjustable between 0 and 12 defrosts per 24 hrs.